- In
This Issue
- Note
we have changed the format to place articles in
sections on one topic and all articles are dated so
you know if we repeat one - whcih we often do when
we think it's very important!
FOA
Turns 25
FOA History
Newsletter
Sections
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on any link to jump to that section
News
Google Fiber is back, Verizon to retire copper, Low prices
on media converters, Rural broadband only discriminates,
Construction worker killed on fiber install site, aerial
install messes
Technical
The mystery of loss in dB solved, splices on
OPGW, manufacturers of prepolished connectors, more
Worth
Reading New Pearson handbook, 600G,
cabling in the data center, NYTimes gives infrastructure
some respect, more
Q&A
As usual, new questions
Training/FiberU
Making training classroom safe, onine training,
materials, more
Resoures
Safety
About
FOA Certifications:

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your FOA Training/Certification to Find the Right Job
in Fiber Optics
Where
Are The Jobs In Fiber Optics? FOA talks about all the
applications for fiber optics, what jobs involve and the
qualifications for the workers in the field in this YouTube
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trademarks of the FOA.

Want
to know more about fiber optics? Study
for FOA certifications? Free
Self-Study Programs are on "Fiber
U®." Looking for specific information? Here's the
largest technical reference on the web: The
FOA Online Fiber Optic Reference Guide.

Free
online self-study programs on many fiber optics and cabling
topics are available at Fiber
U, FOA's online web-based training website.
FOA
Reference Books
Available Printed or eBooks
The
fiber book is available in Spanish and French


Lennie
and Uncle
Ted's Guides are now also available as free iBooks on
iTunes.

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on any of the books to learn more.
- Fiber
Optic Safety Poster to download and print
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The
Fiber Optic Association
Introduction
The
Fiber Optic Association Inc. (FOA) is an international
non-profit educational association chartered to promote
professionalism in fiber optics through education,
certification and standards. FOA was founded in 1995 by more
than a dozen prominent fiber optics trainers and leaders
from education, industry and government as a professional
society for fiber optics and a source of independent
certification, the FOA has grown to now being involved in
numerous activities to educate the world about fiber optics
and certify the workers who design, build and operate the
world's fiber optic networks.
Founded soon after the initial commercialization of the
Internet, the FOA became a "virtual organization," perhaps
one of the first organizations so created. There is no FOA
headquarters building or any "brick and mortar" presence -
appropriate to its technology, FOA exists on the Internet
and in the work of its people. Those who run the
organization live and work all over the world, using modern
communications to communicate and collaborate. The network
of experts working to create the FOA knowledge base and
programs include our technical advisors who average more
than 20 years experience in fiber optics. Their experience
ensures FOA curriculum and certifications are the most
comprehensive and up to date available.
The
Beginning
The
Fiber Optic Association Inc. was created by the instructors
and participants of the 1995 Fiber U training conference
held in Boston. Fiber U was a week-long fiber optic training
event with mornings devoted to classroom courses and
afternoons to hands-on training by numerous vendors of fiber
optic equipment.
Eric Pearson teaches a class at Fiber U 1994 in Long Beach,
CA
Fiber U was the creation of a company called FOTEC Inc. of
Boston, MA. FOTEC was started by Jim Hayes (founder and
current FOA President) in 1980 and began manufacturing test
equipment for fiber optics in 1981. By 1982, FOTEC began to
start training courses for its customers who were all new to
fiber optics. Throughout the 1980s, FOTEC ran short courses
in fiber optics around the US and eventually in many other
parts of the world. FOTEC was only in the test equipment
business, so it invited other manufacturers in areas like
fiber optic cables, connectors, splicing equipment, etc. to
participate in these courses.
Dan Silver (R) of 3M demonstrates how to dress cables in a
splice closure at Fiber U 1994 in Long Beach (more
Fiber U photos)
In 1992, Dan Silver, the fiber optic trainer for 3M Corp.
who was a regular participant in these courses, suggested
that FOTEC expand the program to become a full week
conference. That seemed like a good idea, so the first Fiber
U was held in Nashville, TN in 1993. It was a good idea -
over 200 students came from the US, Canada, Mexico and
several other countries and 40 vendors joined to offer
training. Fiber U became an annual event with international
participation.
During a meeting of instructors at Fiber U 1995, the
discussion focused on the need for a vendor-independent
certification for fiber optic technicians. Manufacturers had
contractor/installer certifications, but they were primarily
aimed at marketing the vendors products. Over lunch, the
decision was made to start a professional society for fiber
optic personnel and offer an independent certification for
techs. All the Fiber U instructors volunteered their
services to build the organization.
The instructors decided the industry was mature enough to
support a professional society and needed to create
industry-wide certifications. The founders included
experienced instructors from industry (3M, Siecor, Panduit,
FOTEC), government (US Navy and Air Force), education
(Lincoln Trail College and Wentworth Institute) and private
trainers (Pearson Technologies, Conquest Communications) who
were teaching fiber optics and who provided the expertise in
management, technology and education needed to create a new
professional society.
In July of 1995, The Fiber Optic Association was
incorporated in Massachusetts and was recognized as an
educational non-profit corporation, 501(C)(6), by the IRS.
The FOA charter was (as it still is now) to promote
professionalism in fiber optics through education,
certification and standards.
The FOA decided to use the new communications medium, the
Internet, to create an international professional society
that would utilize the expertise of the Fiber U participants
without the financial overhead of a traditional
organization. The FOA website, created at the beginning, was
one of the earliest websites for an organization.
FOA website ca. 2000 (view
here on the WayBack Machine Internet Archive)
Who
Were The FOA Founders?
Those
listed below in BOLD are still active teaching and working
with FOA. See Profiles below.
Jim Hayes, President of FOTEC Inc. Pioneering fiber
optic entrepreneur in test equipment and trainer who was
trained in physics/astronomy. Author of many EIA/TIA
standards and the instigator of the NBS/NIST fiber optic
calibration program. Creator of the Fiber U training
conferences. Author of ten textbooks, hundreds of
technical articles. Current FOA President. See Profiles
below.
Eric Pearson, Pearson Technologies. Trained by
Corning in the 1970s, considered an industry expert on
termination and splicing, training since the early 1980s.
Respected expert witness in legal cases. Active FOA
Instructor. See Profiles below.
Dominick Tambone, Engineer, Automatic Tool and Connector,
fiber optic termination and installation, training since
the early 1980s. Contractor and Active FOA Instructor.
Bill Graham, Mississauga Training Associates,
Toronto, ON, CN. Background in utilities, military,
metropolitan fiber optics, training since the early 1990s.
Current FOA Director. See Profiles below.
Prof. Elias Awad, Wentworth Institute, Boston, MA. Started
one of the first fiber optic academic programs in the
engineering department in late 1980s. Creator of NSF
program “Fiber Optics For Engineering Technology”
(NSF#9353997).
Prof. John Highhouse, Lincoln Trail College, Robinson, IL.
Head of telecom training program, started teaching fiber
optic outside plant construction in late 1980s. Masters in
Education, specialty testing. See Profiles below.
Paul Rosenberg, writer and technical trainer
Dan Silver, Product Specialist, 3M Fiber Optics, trainer
and applications. The man with the idea to create the
Fiber U training conferences and active FOA member.
Eric Loytty, Field Engineering, Corning/Siecor,
applications and training.
Bob Mason, Product Manager, Network Systems, Panduit,
applications and training.
Doug Elliott, IBEW Instructor, Toronto, ON, CN. One of
first IBEW apprenticeship instructors to teach fiber
optics.
Tom Collins, Northern Kentucky Technical College,
Professor. Techtricians, Owner/instructor. Current FOA
Director. See Profiles below.
Dan Lyall, Project Engineer, Lockheed Martin, applications
and training.
Jim Davis, Program Director, U. S. Navy Navsea 56ZC, Navy
fiber optic standards.
Dave Chaney, Disney, Network Manager
Tony Beam, Tyco/AMP, Product Manager
Richard J. Smith, FOTechnologies, Technican/Instructor
Profiles
Of FOA Founders Still Active
Jim
Hayes, FOA#1, Founder and President, and Karen Hayes, VP
Administration
Jim
Hayes working with IMSA Instructors on lab techniques
Jim Hayes was recruited into the fiber optic business by
the scientists at Bell Labs who were developing the
technologies in the late 1980s. They wanted the company
he worked for to build test equipment for AT&T. When
his company declined the opportunity, Jim and his wife
Karen, now FOA VP Administration, started one of the
world's first fiber optic test equipment companies in
1980, called FOTEC for, simply enough the Fiber Optic
Test Equipment Company. FOTEC quickly became involved in
training people in this new technology, inviting other
manufacturers to participate, leading
to the Fiber U training conferences. FOA evolved from
Fiber U as a certification body for the fiber optic
industry. Jim has remains active in FOA, serving as
President, writing and editing the FOA textbooks,
newsletters and online Guide, while Karen manages daily
operations as she has done since the beginning and
generally avoids the limelight.
Karen (R) inspects a traffic management system during a
training program in Mesa, AZ.
Eric
Pearson, FOA #5, Pearson Technologies

Eric (back row, right) shows students how to
interpret their work.
Eric Pearson and Jim Hayes are probably the two FOA
Founders with the most years in fiber optics, both started
in the late 1970s and are still active today. Eric began in
the fiber optic cable business, then transmission systems
and designed field installation equipment. He began training
more than 30 years ago and has published his workbooks and
manuals as what we like to call the "cookbooks" of fiber
optics. Eric may be the world's top expert in the process of
fiber optic termination and his books certainly are the best
manuals for termination. Eric still travels the world
doing training courses, finds time to continue writing and
updating his books (See
note below
on the new Kindle version of his installation
handbook) and consulting as an expert
witness in legal cases.
Eric
Pearson, Pearson Technologies
Bill
Graham, FOA #168, Director, Representing FOA In "The
Frozen North"

Bill
Graham (second from left above with the white beard) lives
near Toronto and has probably trained half of Canada in
fiber optics. Bill sold his company, Missisauga Training,
several years ago to another active Canadian who
took over the training but Bill is still active as a FOA
Director and promoter in Canada. Bill is famous for training
in the Frozen North, still in competition with Ian Gordon
Fudge of Fiber DK in Denmark to see who has trained closer
to the North Pole. Bill always sent us photos from his
trips, like these:
Tom
Collins, Director, FOA's IBEW and IMSA Liaison

Tom Collins joined the FOA while a teacher at Gateway
Community and Technical College near Cincinnati, OH. Tom has
about 40 years of experience in the electrical and voice and
data fields. He is a master electrician, voice and
data technician, fiber optic technician, contractor, and a
technical instructor. His experience as an electrician and
apprenticeships has proven invaluable for FOA as Tom has
become FOA's liaison to the IBEW apprenticeship program and
has trained numerous IBEW apprenticeship instructors
at their National Training Institute (Tom's at NTI 2016
above).
Tom became a FOA Director almost 20 years ago and we've
benefited greatly from his experience. He and John Highhouse
created the FOA Train-The-Trainer program and FOA's unique
in the industry instructor certification program. Tom has
helped us understand technical training issues, online
training and testing and a lot of other educational topics.
Tom has a training partner too, his wife Donna, a FOA CFOS/I
instructor herself. Together they have been instrumental in
helping the FOA develop and manage its certification
programs.
John
Highhouse, FOA #2, Retired, Still Influences FOA
Activities
John Highhouse teaching a FOA Train-the-Trainer
Course
John
Highhouse started the first OSP/telecom college program
for fiber optics at Lincoln Trail College in Southern
Illinois. John was a Fiber U instructor and FOA
founder. He participated in the development of FOA
technical materials like our original textbook and the
CFOT certification. One thing John brought to the group
was his background in education with a specialty in
testing. He taught us how to test properly and fairly:
have definitive reference materials for the test that can
be also used for developing curriculum and develop test
questions that determine if the applicant's knowledge is
adequate. FOA still uses the test methodology that John
taught us before he retired.
Certification Program Development
FOA
Advisors Meeting in 1997.
From left around the table: Eric Pearson (Pearson Tech), Bob
Mason (Panduit), Dominick Tambone (Automatic Tool &
Connector), Dan Silver (3M Fiber Optics), Elias Awad
(Wentworth Institute of Technology), Doug Elliott (IBEW
Toronto), John Highhouse (Lincoln Trail College), Dan Lyall
(Martin Marrietta) and Eric Loytty (Siecor), photo by Jim
Hayes
This group of FOA founders began meeting quarterly and
collaborating via email while working to analyze the job
tasks of the fiber optic technician and creating a list of
knowledge, skills and abilities(KSAs) that such a technician
should have. It was an excellent group for this task as they
represented many aspects of the fiber optic field and all
had many years of experience. New recruits joined also. Tony
Bean, an applications engineering manager at AMP who had
previously worked at Siecor, Paul Rosenberg, a trainer for
electrical trades and author who with Hayes had written the
Data Voice and Video Cabling textbook and Dave Chaney, a
contractor who became network manager for Disney Corp. also
joined FOA to assist in the development of FOA programs.
The FOA
Board of Advisors 20 years ago, meeting to work on FOA
certifications.

One aspect of the creation of a general fiber optic
certification was the different types of applications that
fiber optic technicians were involved in. Technicians
working for phone companies building long distance or
metropolitan networks (OSP or outside plant networks) had
different job tasks that those working on premises cabling
for LANs (local area networks), or those in the military
building tactical systems or cabling on platforms like
ships, helicopters or airplanes.
The group was able to define the basic knowledge, skills and
abilities (KSAs) expected of all fiber optic technicians, no
matter their specific applications or jobs. In addition, the
group identified three areas of skills that were often jobs
done by fiber optic specialists: splicing, termination and
testing. These were also identified as subjects for
specialist training and should be considered for specialist
certifications.
It became obvious that FOA was not going to be a training
organization; that would be impossible in light of the
international scope of the organization. Training would be
the duty of the schools, manufacturers and independent
trainers who had been training fiber optic technicians for
over a decade. The FOA would set the standards for
certifications and manage the certification programs and
leave the training to others.
Then the task of creating a certification program began in
earnest. At this stage, the academics became the group
leaders, offering their expertise in development of
educational programs. Professor Highhouse became the project
leader. He created the checklist of requirements for a
certification: KSAs from job task analyses, reference
materials for trainers to use to develop curriculum and for
students to study, criteria and procedures for certification
examination and the examinations themselves.
Developing Reference Materials
The first task for the advisors was to identify reference
materials. A problem was immediately identified. Textbooks
on fiber optics were too theoretical and none dealt with the
installation processes. Materials on installation were
available from manufacturers but were all specific to their
products. There were no reference materials deemed
acceptable, so the decision was made to create a proper
textbook for fiber optic technicians.
The task of editing the book was accepted by Jim Hayes who
had already created a self-published a book on fiber optic
testing for his company FOTEC. The material in that book
became the chapter on fiber optic testing for the new
technician book. Others contributed their expertise.
Everyone contributed to the chapter on applications. Prof.
Awad had created a curriculum on basic fiber optics under an
NSF grant and it was adapted to become the chapter on the
basics of fiber optics. Eric Pearson and Dominic Tambone
created on the chapter on termination and splicing.
Professor Highhouse, Dan Silver and Eric Lloytty wrote
sections on installation.

The material for the textbook was produced quickly as the
authors were all experts in their field and created chapters
on their expertise. Delmar, the publisher of technical
books, became the publisher and the first edition of The
Fiber Optic Technicians Manual (ISBN 10: 0827374267)
was released in 1996. The book was described by Delmar
thusly: “This book is intended for training installers of
fiber optic networks. Technicians and electricians eager to
learn more about fiber optic design, installation, and
troubleshooting will find this book a practical and
comprehensive source, useful in both training and self-study
situations.”
At the same time, FOA began creating a website with the
basic fiber optic information contributed by the advisors
made available to everyone online. That website, the FOA
Online Guide, has been expanded and updated continually
until today.
Creating A Certification Exam
With the job analysis and KSAs as a reference guide,
Professors Highhouse and Awad and their collaborators began
creating criteria for classroom and laboratory training and
an exam of the knowledge of certification candidates. The
training aspects were covered in an Instructor’s Manual
created by the FOA that described the classroom and hands-on
labs expected for certification. In the process of creating
an exam covering the knowledge part of the exam, Professor
Highhouse created guidelines for creating tests and test
questions still in use by the FOA today.
The first FOA exam for certification was made released by
the Board in 1997. The certification by that time had a
formal name, Certified Fiber Optic Technician, CFOT. The
certification was first offered by the founders of the FOA
to their own students to verify the program before expanding
to other training venues. The examination process involved
the instructors who were tasked to verify that students
showed appropriate skills and abilities during hands-on
activities before taking the examination given at the end of
the course.
Expanding The Scope Of The FOA
During this development process, the FOA had been introduced
to the world as the international professional society of
fiber optics. Interest in the FOA certification program was
high and trainers around the world began asking to become
part of the program. When the FOA advisors agreed that the
CFOT was ready to be offered by more trainers, applications
were accepted from trainers and training organizations.
Criteria for potential trainers were established by the
advisors that included requirements for curriculum in the
classroom and hands-on labs, including required training
equipment. Educational institutions, commercial trainers and
fiber optic manufacturers or vendors made applications. The
advisors realized that to maintain the integrity of the
certification, it was necessary to create an agreement with
the schools or trainers that covered all aspects of the
certification process and included regular reviews of their
performance.
Some applicants, especially in the academic world, had
little or no practical knowledge in fiber optics, so it was
necessary to help them learn the knowledge and recommend to
them venues to acquire the hands-on skills necessary. Many
used the Fiber U conferences which had partnered with other
organizations like the National Electrical Contractors
Association, the COMNET conference, etc. to offer training
at many conferences and meetings. Others used other
FOA-approved trainers or vendors for training. To provide a
guide to skills training, FOA personnel led by Pearson,
Tambone and Hayes developed a Fiber Optic Lab Manual that
described in detail the processes used in fiber optic
installation and how they should be taught in labs.
John Highhouse
conducts class at FOA TTT 2002
FOA began planning its own Train-The-Trainer program to be
held at Gateway Community College where Professor Tom
Collins taught. Prof. Collins had joined the FOA advisors
after attending Fiber U and creating his own program at
Gateway and the IBEW apprenticeship program in Cincinnati.
The first FOA T-T-T was held in 2002 at Gateway, run by
Professors Collins and Highhouse and introduced the FOA
certification for instructors, CFOS/I, Certified Fiber Optic
Specialist in Instruction. After several years of T-T-T
classes, the instructor training was primarily moved online.
Meanwhile, advisors Pearson, Tambone and Hayes were heading
a group working on skills specialist certifications in
splicing, termination and testing. Job analyses were done
and KSAs created for CFOS/S, Certified Fiber Optic
Specialist, Splicing, CFOS/C, termination with connectors
and CFOS/T for testing. These skills-based certifications
had greater requirements for hands-on labs, with more
equipment and time for hands-on activities required. Exams
were developed with Professors Highhouse and Awad using the
criteria they had created. Instructor manuals were developed
to assist instructors in setting up appropriate training.
FOA schools were then authorized to offer these specialist
certifications.
A Virtual Organization
As mentioned earlier, the FOA was a professional society of
the Internet age. There was no physical presence, per se,
and no employees, just a few contractors and many
volunteers. Income from certifications, initial and renewal,
and book royalties was sufficient to pay outside services
like administration and accounting. By 2002, the daily
operations required more time and attention, so Jim Hayes
and Karen Hayes, having sold their company FOTEC, were
contracted to manage the organization and provide technical
leadership, a role they still fulfill today. FOA also has
contracted administrative, bookkeeping/financial, software,
media and legal services as needed. In 2003, the FOA was
legally moved to California when the Hayes’s moved to
Southern California.
Growing Into The 21st Century
The early 2000s were a development time for the FOA and its
network of schools expanded worldwide. Although the fiber
optic industry in the US experienced a severe recession in
2001-2 as the large Internet growth of the late 1990s turned
out to be a bubble, the FOA continued to grow, particularly
overseas. Programs and operations were continually improved
and updated as technology and applications evolved.
With
the internationalization of the FOA, the advisors expanded
to include some very qualified people. Joe Botha, owner of
Triple Play Fiber Optics in Durban South Africa was
training fiber techs throughout sub-Saharan Africa and
working with governments and telecom companies on manpower
development. Ian Gordon Fudge of Fiber DK in Copenhagen,
Denmark was a consultant and authorized trainer for many
fiber optic and communications companies working an area
from the Arctic to the Middle East. Bee Suat Lim of 100G
Training and Consultancy in Singapore was involved with
projects in Southeast Asia. These three have been major
contributors to the development of FOA technical resources
and certifications, as have many others involved in the
FOA organization.
Like all organizations, the FOA's development was dependent
on a group of highly competent, highly motivated individuals
devoted to educating the fiber optic community. Some of the
instructors and training organizations that were
instrumental in FOA's growth deserve special recognition.
Bob Ballard
of BDI Datalynk and one of his classes
Bob Ballard started BDI Datalynk, a training organization
with a unique approach: Make the classroom look like the
real world then pack it into the back of a van. Carry it
around the country and partner with the continuing education
departments of colleges to offer FOA certification classes.
Bob sold BDI and retired in 2018.
Joe
Botha of Triple Play in his element, teaching in Zambia
Joe has been instrumental in training techs throughout
Sub-Saharan Africa. Joe is also creator of the FOA OSP
Construction textbook.
Ian Gordon Fudge of Fiber DK teaching students how to splice
OPGW in Greenland. Ian and FOA Director and Canadian Bill
Graham have a friendly competition to see who has trained
more places in the far North.
Bee
Suat Lim, Director (R) and Isaac Yeo Hock Lai (L) of 100G in
Singapore with Karen and Jim of the FOA during a visit to SE
Asia. Bee was instrumental in creating the FOA textbook on
Fiber Optic Network Design and training techs in SE
Asia.
Jerry Morla, 2nd
from R, at a meeting of FOA instructors in Atlanta, is the
latest FOA Director to join us. Jerry, who came on board in
2008, is FOA's ed-tech person, looking at new methods using
technology to make learning better and more efficient, a
valuable asset in these times of social distancing and
isolation.
Partnering and Promoting FTTH Since 2006
In
2006 when FOA was approached by Verizon to assist them in
recruiting and training personnel for a new program of fiber
to the home expansion called FiOS. FOA advisors worked with
Verizon technical personnel to understand the new passive
optical network technology (PON) being used, the
installation practices they were developing and create
reference and educational materials to support training. In
addition, In 2007 FOA and Verizon did several seminars
together on both coasts to educate trainers and contractors
and help Verizon’s recruiting efforts. This work led to the
new FOA specialist certification in FTTx or Fiber to the
Home/Business/Curb, etc., FOA’s first application
certification. This certification was uniquely structured to
be appropriate for both technicians who would be installing
FTTx and managers who needed to be trained in the new
technology that their company was promoting and installing.
FOA and Verizon ran this FTTH Summit in LA in 2007
The success of the FTTx certification program encouraged the
FOA to create several new certifications. Professor Tom
Collins worked with FOA to develop a certification in
premises cabling based on standardized structured cabling
for LANs (local area networks for PCs), but expanded to
include copper and fiber cabling and the rapidly growing
WiFi wireless technology. Several schools wanted a
specialist skills certification for outside plant
technicians which was also developed, then later updated
with material from advisor Joe Botha’s construction course
to include aerial and underground construction. Other
certifications were created at the request of instructors,
schools and industry groups, including optical LANs and
fiber optics to support wireless networks.
FOA As A Publisher
As the FOA grew, the FOA Guide’s online technical material
became a trustworthy resource for people looking for answers
about fiber optic topics. But the FOA textbook was a
preferred resource for those who still liked their
information on paper.
While FOA was regularly updating its online technical
material and exams to keep up with technology, the textbook
publisher was much slower to update the textbook which
became a problem. In 2008 as the world entered another
recession, the publisher postponed an update and raised the
price of the book to a point the FOA schools objected. FOA
did a survey of publishing, decided that publish-on-demand
technology was a more acceptable alternative and began
creating its own textbook, The FOA Reference Guide To Fiber
Optics, based on the online technical materials on the FOA
website. The FOA Online Guide had grown to hundreds of pages
of technical materials and became the most popular reference
for fiber optics online, with over one-half million visitors
downloading about four million pages of the FOA Guide in
2018.
FOA's
self published fiber optic textbook for CFOT certification
The new self-published FOA textbook was an immediate
success. It was more up to date, better organized for both
teaching and reference and, even at about one-fourth the
price of the previous book, contributed more royalty income
to the FOA. In addition, it could be updated anytime, so the
FOA has since combined the textbook review with the annual
review of the CFOT certification program, updating them in
concert.

The ease and success of self-publishing encouraged FOA to
expand its offering of books. The original book was
translated into Spanish and French for our schools who
taught in those languages. Additional books were introduced
to support FOA certification programs in fiber optic network
design, outside plant installation, premises cabling and
fiber optic testing. FOA also printed the textbook created
by one of our advisors, Joe Botha in South Africa, for
outside plant construction.
FOA Became A Resource For The Industry
FOA began an online newsletter in the early 2000s, covering
news of the industry, interesting applications, new
components and what became a favorite section, “Good
Question.” The FOA had been getting calls and emails from
people looking for advice which we were able to answer by
using the broad expertise of our advisors. This column in
the newsletter gave the FOA an indication of what people
wanted to know and insight into issues in the industry.
Those questions led to new pages in the FOA online Guide to
expand on the answers and have been archived on the FOA
website. Today the newsletter has about 20,000 readers per
month and the questions keep coming, several every day.

As the FOA Guide grew to nearly 1,000 pages of technical
information and was used more and more, it rose to the top
of web searches, increasing its audience even more. After
twenty years of growth, the FOA Guide has nearly a
half-million visitors each year downloading almost 4 million
pages of technical information.
As the Internet became capable of supporting video, FOA
offered tutorials online on many aspects of fiber optics.
With the advent of YouTube, FOA created a YouTube channel,
thefoainc, that hosts over 100 videos, including 50 lectures
and an equal number of hands-on tutorials. The FOA YouTube
channel has almost 20,000 subscribers and over 3 million
views.
Online Education For Free

Along with the Fiber U technical material, the FOA obtained
the name “Fiber U”, and used it to create an online
self-study website, fiberu.org, inspired by the original
Fiber U online created in 1997. Fiber U was one of the first
online learning sites based on the work of a Boston school
teacher who had developed it for Boston teachers. While he
was a summer intern at FOTEC, he created Fiber U online
based on the FOTEC/Fiber U online technical website, and it
became an immediate success.
Since the FOA Online Guide was so extensive, FOA used Fiber
U as a way to assist anyone wanting to learn about fiber
optics and for experienced fiber techs to study before
challenging the FOA CFOT exam without taking a training
class. Several instructors, led by Professor Tom Collins,
used Fiber U as part of a blended learning program for their
college students, with online study replacing some classroom
lectures, allowing in person classes to be primarily devoted
to hands-on labs. While Fiber U has been a valuable way of
assisting people learning about fiber optics and preparing
for FOA certification, it is not used for direct
certification, only as a learning aid. Actual certification
requires training and/or taking an exam while proctored.
FOA Assistance With Fiber Optic Projects
Quite a few inquiries the FOA gets are about fiber optic
network projects. The projects vary from metro traffic and
surveillance networks, independent fiber to the home (FTTH),
industrial (oil and gas, chemical, automotive, etc.),
government/military and much more. FOA provides free advice
on a technical level and contacts needed for the projects.
FTTH has been a popular topic and FOA has assisted in
projects as diverse as Southern Fiberworx, a FTTH project
done entirely internally by a real estate developer and Anza
Electric Cooperative’s project in the CA mountains that
became known as “fiber to the ranch.” Other FTTH projects
have been in areas as diverse as Lebanon and South Africa.
FOA has also been involved in optical LANs based on FTTH
technology that has become very popular in the government,
medical and hospitality fields.
FOA provides this assistance at no cost, considering it part
of our original charter as a professional society. Of
course, all the projects require qualified technicians to
design, install and operate them, thus promoting the FOA and
its certifications, Many of the projects also require
training personnel which benefits the FOA network of
approved schools and its certification programs. And the FOA
network of advisors often take over to provide assistance to
the projects locally.
All
of this work, the free technical reference materials and
online training, assistance in answering inquiries and
providing contacts has made FOA the center of fiber optic
activity and a trusted source of information.
Partnerships And Affiliates
FOA’s expertise in the fiber optic field has led to
partnerships with other organizations wanting to provide
their groups with that training. Several members of the
FOA founders and early advisors (Hayes, Elliott, Graham,
Collins) were involved with the IBEW/NECA NJATC
telecom/low voltage apprenticeship program, the largest
technical apprenticeship program in the US. FOA became a
partner with the NJATC to assist them in developing their
program in fiber optics, participating in their annual
National Training Institute for instructors, and has
trained hundreds of JATC instructors who teach for the FOA
CFOT at over 30 local union apprenticeship training
centers.
FOA works with IMSA, a century-old professional society
for traffic control engineers to provide CFOT
certification. The Communications Workers of American
Alliance uses FOA certifications to ensure competence for
their workers. FOA is now assisting IPC, a trade
association for manufacturers of hardware primarily for
aerospace industry, create a fiber optic certification
program. FOA has worked with EPRI, the Electric Power
Research Institute, to create a Strategic Guide To Fiber
Optics for their member utility companies.
Fiber optic manufacturers like Corning and Clearfield,
telecommunications companies around the world like
Cincinnati Bell and Etisalat in UAE and many more use FOA
programs for training and certifying employees and
customers.
Hundreds of companies, agencies and organizations
worldwide use FOA certifications as a measure of
competence for employees and contractors. FOA-certified
techs build telecom landline and wireless networks, CATV
systems, utility networks, data centers, explore for oil
and gas, operate remote-operated vehicles for undersea
exploration, build military strategic and tactical
networks and hundreds of other applications, literally
from pole to pole.
Standards And Technology
FOA has been involved with standards programs for many
years. FOA is a member of the TIA and ANSI and a
participant in the TIA TR-42 committee on fiber optics and
cabling. Jim Hayes is the usual FOA representative in the
standards committees as he has been involved with
developing fiber optic standards since 1983 at TIA, ANSI
and several military standards groups. While at FOTEC, the
fiber optic test equipment he founded in 1980, he
convinced the US National Bureau of Standards that a
standard was necessary for fiber optic measurements
leading to the NBS/NIST program for calibrating optical
power. He is the original author of EIA/TIA standards
FOTP-95 and OFSTP-7/14 and a contributor to numerous other
standards dating back to the 1980s. Other FOA members have
been actively involved in standards, including founding
member Jim Davis who was the project leader of the
military standards group NAVSEA-56ZC until his retirement.
FOA partnered with NECA (National Electrical Contractors
Association) in their NEIS (National Electrical
Installation Standards) program to create
ANSI/NECA/FOA-301, a standard for the installation of
fiber optic cable plants. Today FOA maintains an active
role in the TIA and monitors other standards groups for
information important to the fiber optic field. FOA helps
explain their meaning and importance to the readers of its
technical materials. FOA is considering becoming an active
ANSI standards member and creating standards for fiber
optic network installation. FOA
has worked with organizations like the US Department of
Labor to create job descriptions for fiber optic techs and
assist in standards for workplace certifications.
FOA advisors had a long history participating in industry
standards and co-operative R&D projects. The
organization has taken on several technical projects
itself in topics of interest to the fiber optic industry,
many in the field of testing. Pearson and Hayes
investigated the correlation of optical loss test sets
(OLTS) and optical time domain reflectometers (OTDR) in
multimode tests with mode conditioners. Terry O’Malley, an
FOA advisor who created and gave training at AT&T on
OTDRs has done several projects to show how OTDR traces
show events of interest such as low reflection APC
connectors and the condition of the end of an optical
fiber that is broken. Joe Botha in South Africa did
projects with his students on splicing dissimilar
singlemode fibers. Two FOA advisors, Bill Graham and Ian
Gordon Fudge, have a ongoing contest of who can do
training closest to the North Pole and they share their
experiences in cold-weather applications through the FOA
newsletter and website.
As a certifying body, FOA has been following the
guidelines of ISO/IEC 17024, the international standard
for certifying bodies, following its guidelines to create
a better certification program.
Statistics

As of July 2020, our 25th Anniversary, FOA has
certified more than 81,000 technicians who have achieved
over 110,000 certifications. FOA has approved
schools offering FOA certifications in more than 40
countries around the world. Besides the US, FOA
instructors teach in locations as varied as First Nation
villages in the Canadian Arctic, villages in Greenland,
the Middle East, most countries in Africa, South America
and Asia. FOA’s Advisory Board has members in the US and
Canada, Copenhagen, DK, Durban, SA, Singapore, Nairobi,
Cairo, and more, assuring the FOA maintains an
international perspective on the fiber optic field.
FOA's
Longest Active CFOTs
As part
of our 25th anniversary, FOA tracked down the earliest CFOTs
still
active in the industry - many more than 20 years. Those
marked * are still active educators!
We are probably missing some that did not respond to our
emails or are not listed as active in our certificants list,
so it you think you belong in this group, please email us!
*Jim
Hayes #001
*Eric Pearson #005
*Peter Olders #013
Bruce Trefethen, CFOT #017
Ron Blanding #106
Craig S. Danielson #107
*Bob Kinney #115
*Bill Graham #168
Dominick Tambone #237
*Milt Murry #545
Michael L. Masucci #737
Ron Hanes #752
*David
Engebretson #773
*William “Van” Ewert #1076
*Tom Norwood #1125
*Guy Sanford #1177
*Ron Szpila #1253
*George Lister #1684
*Leonard
Wasser #1685
*Levi West #1821
Julie K #2035
Juan D. Hinojosa #2122
*Tom Collins #3368
*David Schaefer #6800
*Anthony Flaris #1000050
*Jimmy Franko #1000052
Paul
Jimenez #138000
Robert Dancy #1420015
Comments
From Some Of The People Who Helped Build The FOA
John
Highhouse: I just remember us at our first
meeting discussing the importance of putting together a
certification program that had real standards and not
just some "mail order certification". I believe it
worked quite well as evidenced by the high regard people
have for the FOA name. Thanks for all you've done
for the industry. I honestly think that you got
the ball rolling and kept it straight down the
alley. Congrats for 25 excellent years.
Joe Botha: An educational association
reputation is something that you should consider when
choosing a place to study. You should focus your attention
on those that have name recognition and are known the
world over for being “good”. The FOA embodies “good”. FOA
is particularly known for its more than ample online
resources. Access to approachable, helpful, and passionate
about their subject matter experts. And you will be able
to find amongst a wide selection, the right course or mix
of courses to suit your interests and career ambitions.
Bob Ballard: Happy 25th Anniversary to the FOA -
my past business "partners"! I would like to say,
"thank you" for your many years of dedication to the fiber
optics industry and may it continue its growth in the
future - especially during these uncertain times.
You have provided this industry with an endless supply of
professional guidance, course curriculums, and market
knowledge.
I would like to offer a very special "thank you" for
allowing me to be a part of your organization for the past
17 years. Now, in my retirement from the fiber
optics industry, I look back on the extremely successful
opportunities your organization allowed me to be a part
of. The overall growth and success of my company can
only be attributed to your efforts to provide only the
best and most current fiber optics training curriculums
available anywhere in the world. Thus, the FOA
allowed me to use these materials, its guidance and its
website to build one of the largest and most successful
fiber optics training companies in the world.
Unfortunately, times, circumstances, and opportunities
have changed and, while the current road is not as clear
as it was in the early days, the FOA is there to assist
and, hopefully, will be there for many more years to come.
Thank you FOA for many past years of success in this great
industry.
Bill Graham: While Fiber Optic training was my
main occupation, I found myself involved in many other
industries such as mines, nuclear, aviation, industrial
machines, homes and many places using optical fiber, in
many case of odd types and sizes of fiber. Work in this
field took me to the USA, Europe, Caribbean, Baffin Island
and the furthest First Nation reserves in Northern Canada.
I joined the Fiber Optic Association and became a
Director. I found myself part of a group of the most
knowledgeable people in the industry. The original group
represented many facets of the industry. Jim and Karen
Hayes took the lead and have to be credited with the
original organization of the FOA as well as their
dedication bringing the FOA to the present state. The
industry owes them a debt of gratitude.
The rest of the years to this date have been terrifically
exciting, learning new technics in an ever changing,
life-long learning industry and meeting great people as
students and as vendors. All in all, it has been an
exciting trip and I am eternally grateful to all the great
people with whom I have been associated with over the
years.
And from FOA Director Jerry Morla, a relative newcomer
to FOA (2008): Over the last 25 years, the FOA has
incessantly worked to deliver on its mission of
professionalizing the fiber optics industry. After over
two decades, de FOA has achieved to contribute to the
development of hundreds of thousands of fiber optic
technicians and industry professionals around the world,
resulting in direct impact and quality gains for
stakeholders at of levels of the telecom industry. We are
extremely thankful with everyone that has contributed to
these achievements, especially our instructors and schools
that have partnered with us throughout this endeavor. As
the world goes through unprecedented times and increasing
reliance on broadband networks and fiber optic
professionals for ensuring continuance of services,
overcoming global challenges, and continue improving our
way of life, the FOA will continue to illuminate the way
by sharing knowledge, skills building, and professional
development opportunities with colleagues and apprentices
from all over the world.
And from Bee and Isaac at 100G:

Want to add your comments? Send them to jim @ foa.org.
|
Technical
On
fiber optic technology, standards, equipment,
installation, etc.
The
FOA Update Page
covers all the new technology and applications we covered
in this newsletter recently. Now you can review all that
new tech at once.

Want
to know more about fiber optics? Study
for FOA certifications? Free
Self-Study Programs are on "Fiber
U®." Looking for specific information? Here's the
largest technical reference on the web: The
FOA Online Fiber Optic Reference Guide.
|
dB
Update - Mystery Solved! 7/2020
Executive
Summary: IEC changed the definition of attenuation
to make it a positive number in defiance of mathematical
and metrological standards, centuries of mathematical
history and common sense.
To
Change The Negative Sign For Loss, Just Change The
Definition! Who Cares If Everybody Else Does It
Differently....
Just
recently FOA was reviewing a new proposed update for FOTP-78
IEC 60793-1-40 Optical Fibres - Part 1-40: Measurement
Methods and Test Procedures - Attenuation. This FOTP might
be the most-referenced FOTP since it deals with measuring
attenuation, something that dozens of FOTPs use in their
testing of components. I started reviewing this document by
skimming the Terms And Definitions, where I was stopped by
Section 3.1 which defined attenuation.
The classic attenuation equation was different.

where (quoting from the standard)
- A
is the attenuation, in dB
- P1
is the optical power traversing cross-section 1 (e.g.
before the attenuation you are measuring - what we
would call the "0dB" reference in testing cables)
- P2
is the optical power traversing cross-section 2. (e.g.
after the attenuation you are measuring - what we
would call the measurement of loss in testing cables)
Note 1
to entry: Attenuation is a measure of the decreasing optical
power in a fibre at a given wavelength. It depends on the
nature and length of the fibre and is also affected by
measurement conditions.
As we traced this definition in other IEC standards, we find
they are variations of this, and one specifically states
that it expresses attenuation as a positive term.
So there you have it - why attenuation is positive - and
therefore gain - like a gainer on an OTDR - is a negative
number. The IEC standards just turned the measurement upside
down - reversing "Measured Power" and "Reference Power" to
get the term to become a positive number in dB when it's
attenuation.
And I might add, they are unique. See References
below. Undoubtedly some instrument manufacturer wanted the
definition that way and had no broad knowledge of
measurement convention. Nor did they understand fiber optic
power meters.
At least now we know where the confusion lies.
Three issues:
First:
There
are several reasons to object to this from a mathematical
and measurement standpoint. When you measure something
against a reference, it's common to divide the measured
value by the reference. Thus if something is getting
smaller, like attenuation, and the change is the measured
value decreases by 50% or half, you expect the ratio of
powers to be a number less than 1 because the value has
decreased, in this case the ration would be 1/2 or 0.5 0r
50%.
Consider what happens when using the equation above. If P1
is the reference and P2 the value after it decreases, the
ratio for the example above would be 2. Wouldn't anybody
assume that the measured value had increased instead of
decreased it the ratio was 2?
Second:
There are several reasons to object to this from a
mathematical and measurement standpoint. When you measure
something against a reference, it's common to divide the
measured value by the reference - like we do defining dBm
where the reference is 1mw.

We checked and the TIA and IEC standards for measuring
power, FOTP-95, still defines dBm this way. That's good,
because we're used to negative dBm being power smaller than
1mW and positive dBm being power larger than 1mW.
However if one makes an attenuation measurement using a
fiber optic power meter calibrated in dB and you used the
"Zero" control to set the reference,
the resulting measurement of loss will be a negative
number. Likewise if you measure the two powers in dBm,
the resulting measurement of loss will be a negative number,
if you understand negative numbers.
Remember dBm is defined as Power(measured)/Power(1mw) (see
FOTP-95, Sec. 6.2) and if dBm were defined in this
upside down manner, power levels below 1mW would be
positive numbers, not negative as they are now, and power
levels above 1mW would be negative! How's that for
confusing.
Third:
The definition assumes you are making measurements in linear
units - Watts, milliwatts or microwatts, then calculating
dB. Does anyone do that anymore? We don't think so.
Instruments measure in dB and dBm. Recognizing that, some
standards actually tell you how to calculate using simple
subtraction of dB or dBm measurements but reverse the values
so loss is positive and gain negative.
Maybe it's time to drop the definition from the standards or
at least provide descriptions of how one makes measurements
in dB.
References: The method for calculation of attenuation
in dB IEC uses in these fiber optic standards is definitely
not how measurements are normally defined. In fact we looked
at several dozen websites and the result was 100% -
attenuation is a negative value.
Rapid
tables
Wikipedia-
If P is
greater than P0 then LP is positive;
if P is less
than P0 then LP is negative.
Wikipedia
- definitions of the International Systems of Quantities -
If P is
greater than P0 then LP is positive;
if P is less
than P0 then LP is negative
TonTechnik-Rechner
- see Electric Power (telephone)
UC
San Diego Neurophysics - they get it! - (-3dB = half
power)
UC
Santa Cruz - with
the measured value less than the reference, we get a
negative dB value
Henry
Ott Consultants - The unit can be used to express
power gain (P2>P1), or power loss (P2<P1) -- in the
latter case the result will be a negative number.
Electronics
Notes - Where there is a loss, the deciBel equation will
return a negative value
dB
or dBm -Still Confusing 4/2020 -
The
second most missed question on FOA/Fiber U online tests
concerns dB, that strange logarithmic method we use to
measure power in fiber optics (and radio and electronics
and acoustics and more...). We've covered the topic
several times in our Newsletter but there still seems to
be confusion. So we're going to give you a clue to the
answers and hopefully help you understand dB better.
These are all correct statements with the
percentage of test takers who know the answer is correct.
The most answered correctly: dBm is absolute power
relative to 1mw of power (78.8% correct. Does "absolute"
confuse people? It's just "power" but absolute in
contrast to "relative power" which is loss or gain
measured in dB.)
This one is answered correctly less than half the time: dBm
is absolute power like the output of a transmitter.
(41.5% correct, see comment above.)
This one does often get answered correctly: The
difference between 2 measurements in dBm is expressed in
dB. (23.8% correct)
Here is an example of a power meter measuring in dBm and
microwatts (a microwatt is 1/1000th of a milliwatt.)

Here
is an example
of the
conversion of
watts to dBm.
This meter is
reading
25microwatts -
that's
0.025milliwatts.
If we convert
to dBm, it
becomes
-16.0dBm. We
can easily
figure this
out using dB
power ratios.
-10dBm is 1/10
of a milliwatt
or 0.100mW.
-6dB below
that is a
factor of 0.25
so 0.1mW X
0.25 = 0.025mW
or
25microwatts.
The other way
to figure it
is -10dB is
1/10 and -6dB
is 0.25 or
1/4th
(remember 3dB
= 1/2, so 6dB
= 3dB + 3dB =
1/2 X
1/2 = 1/4) so
-16dBm is
1/40milliwatt
or
0.025milliwatts
or
25microwatts.
Read a more
comprehensive explanation of dB here in the FOA
Guide.
Ever
Wonder What Splices For OPGW Look Like?
7/2020
FOA
Instructor and full time installer Jane Bailey sent us this
photo of some recent work splicing OPGW. Very interesting!
Note the incoming cables and the rugged fiber tubes in the
closure.

Splice-On
Connector Manufacturers and Tradenames
7/2020
Eric Pearson shared a list he has researched of prepolished
splice connectors with mechanical splices and SOC -
splice-on connectors for fusion splicing. This list shows
how widepread the availability of these connectors has
become, especially the SOCs and low cost fusion splicers.
Mechanical Splice
1. Corning Unicam® (50, 62.5, SM)
1. FIS Cheetah (???)
2. Panduit OptiCam® (50, 62.5, SM)
3. Commscope Quik II (50, 62.5, SM)
4. Cleerline SSF™ (50, SM)
5. LeGrand/Ortronics Infinium® (50, 62.5,
SM)
6. 3M/Corning CrimpLok (50, 62.5, SM)
7. Leviton FastCam© (50, 62.5, SM)
Fusion Splice
2. Inno (50, 62.5, SM)
3. Corning FuseLite® (50, SM)
4. FORC (50, 62.5, SM)
5. Siemon OptiFuse ™ (SM, MM)
6. Belden OptiMax?? FiberExpress (SM, MM)
7. AFL FuseConnect® (SM, MM)
8. OFS optics EZ!Fuse ™ (50, 62.5, SM)
9. Sumitomo Lynx2 Custom Fit® (50, 62.5,
SM)
10. Commscope Quik-Fuse (50, SM)
11. Ilsintech Pro, Swift® (50, 62.5, SM)
12. LeGrand/Ortronics Infinium® (50, 62.5,
SM)
13. Greenlee (50, 62.5, SM)
14. Hubbell Pro (50, SM)
15. Easysplicer (SM)
Note: There are additional manufacturers from the Peoples
Republic of China, which advertise on Amazon and eBay.
The
Times They Are A Changin' (fiber optics, that is) 6/2020
(With
kudos to Bob Dylan who is releasing
a new album this month at the young age of 79!)
What we mean by that title is that in technology things
change. In recent times we've seen a lot of change in fiber
optics and recent standards meetings and discussions with
some of the FOA technical advisors have amplified some of
these changes, as we report here, such as the issue of
mulimode vs singlemode fiber above and the topics below.
Connectors: Nobody ever wanted to polish fiber optic
connectors in the field - ever - and that only worked with
multimode fiber anyway - singlemode polishing was too
critical to be done in the field. Long ago, factory made
terminations with a mechanical splice in the back of the
ferrule became available. We called them prepolished/splice
connectors. But they were tricky. The secret to a good
termination was a good cleave and good cleavers were
expensive.
Over time, better termination kits made the connectors lower
loss and easier to install. Now the inexpensive cleavers
reviewed above make these connectors work better, but the
combination of a connector and a mechanical splice mean they
are still expensive. And mechanical splices generally work
better with multimode fiber than singlemode fiber.
More recently, fusion splice-on connectors (SOCs) have
become available. Instead of a connector plus mechanical
splice, you have a connector with a pigtail that you fusion
splice on to a fiber to terminate it. Eliminating the
mechanical splice reduces the cost considerably. The fusion
splicer has also become much less expensive also, making
this a very popular choice for singlemode fiber where you
must have a fusion splicer anyway. They are available for
multimode and singlemode, but the big price advantage is
with singlemode.
Testing Multimode Fiber and Bend-Insensitive Fiber: A
decade ago when bend-insensitive multimode fiber (BI MMF)
first became available, it was not well understood. Since
this was the era of the adoption of "encircled flux" as a
new method of specifying mode control for MM testing, the
unknown effects of BI fiber on modes was not well
understood. As a result, BI MMF was prohibited for use
in reference test cables when testing, even if testing BI
MMF in most standards for testing. That prohibition made
little sense since no fibers were marked as BI or non-BI and
since most MM fiber was BI, finding non-BI fiber for test
cables was problematic. And nobody really knew about this
issue anyway.
FOA has been asking questions about this issue regularly in
standards committees. At a TIA meeting held online recently,
Fluke presented data that showed only minor differences
between tests made with reference test cables with regular
(non-BI) and BI MMF. This realization is making its
way through standards committees now, so this issue is going
away.
OLTS vs OTDR Testing: This is a bit of a bigger issue
than the one above and the subject of many discussions and
articles over the years. In recent discussions with Eric
Pearson and some other FOA advisors covering the OLTS/OTDR
issue as well as the issue of loss budgets, the consensus
was this should not be a issue, either OLTS or OTDR data
should be acceptable if the testing is done properly.
"Done properly" means OTDR testing uses both a launch and a
receive reference cable, meaning it is not a single-ended
test.
Understanding the combined measurement uncertainty has made
this a non-issue. For multimode fiber, the total loss of a
typical link is only 2-3dB since premises cabling networks
are short and multimode fiber loss is lower than in the past
- nearer 2dB/km than 3dB/km on modern fibers. The
uncertainty of such low loss measurement with either
instrument is small enough that either measurement will give
a good indication of the quality of the fiber. The same is
true for premises SM fiber in a data center or passive
optical LAN.
The same is true for OSP singlemode fiber where the OTDR
loss measurement is going to be made anyway to verify
splices on concatenated cables. Longer cables are probably
be tested for fiber characterization also, so lots of data
will be available for judging the condition of individual
fibers.
Eric Pearson makes another good point. His experience is
that fibers are either good or bad, usually really bad, not
just slightly so. If the tech doing the testing has good
cleaning discipline, the connectors are cleaned and
inspected, so a failure might be a poorly installed
prepolished/splice connector, and that's likely to be quite
bad. If the connectors are field-polished on multimode
fiber, careful inspection is extremely important to insure
connectors were installed properly.
We'll finish with Eric's conclusion: And if reasonable care
is taken, both LSPM/OLTS and OTDR tests will give “useful"
results. The purpose of measurements is to accept or reject
the installed products. With that understanding, the
explanations of the subtleties are not critical to the
installers, for whom I write. That being said, the key
qualifier is 'if reasonable care'
Conclusion: Technology changes but one thing does
not. With all the topics above, the results are all
dependent on the knowledge and skill of the technician.
Experienced technicians need to stay up to date and novices
need to be trained correctly. That's the focus of the FOA.
When founded almost 25 years ago - next month is our
anniversary - the charter was to "Promote professionalism in
fiber optics through education, certification and
standards." Still is.
But then, another mystery shows up: Eric
Pearson brought up a new issue with standards. This
concerns the use of a singlemode mode filter; a small loop
to remove higher order modes from singlemode fiber for
testing. When a laser source launches into a
singlemode fiber, the fiber may carry more than one mode for
a short distance, say up to 100m. To prevent this affecting
measurements, standards have generally specified a mode
filter in the launch cable created with a small loop in the
fiber, around 30mm.
Back in the 90s, the standards had a 2” loop and referenced
FOTP-77. FOTP-77 was allowed to expire in 2003 and sometime
later the loop became 30mm/1.3”. Now it seems to have
disappeared from some international standards (Eric says IEC
61280-4-2 has no requirement for the loop) but remains in
some US standards like FOTP-171, sec 3.3. Phil Irwin of
Panduit, head of the TIA TR42.11 standards committee, noted
that FOTP-34, the standard for measuring components loss,
e.g. connectors, and FOTP-171B (patchcords) include this
mode filter before and after the component under test.
Another topic for another time. We will continue
investigating this.
FOA
Loss Budget Calculator On A Web Page 5/2020
FOA has
written many articles about loss budgets, something everyone
involved in fiber optics needs to know and needs to know how
to calculate. We recently discovered how to get a
spreadsheet ported to a Web page, so we created this web
page that calculates loss budgets. We have an iOS loss
budget app, but with this web page, you can calculate loss
budgets from any device, smart phone, tablet, laptop, or
desktop computer that has web browsing capability.
Bookmark this page (especially on your smartphone): FOA
Loss Budget Calculator Online
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