Jim Hayes

Fiber Optics Columnist and Freelance Writer

HAYES is a VDV writer and trainer and the president of The Fiber Optic Association. Find him at www.JimHayes.com.

Articles by Jim Hayes

November 2010
Loss is the No. 1 performance specification in fiber optics. Whether you are designing a network, specifying components or testing an installation, the focus is on loss. How well do you understand fiber optic loss? Answers and explanations are in red. 1. Loss in a fiber optic cable plant is the reduction in optical power caused by ________. A. Connections B. Fiber attenuation C. READ MORE
October 2010
The majority of premises fiber optic cables use multimode fiber. Many of these cables are backbone cables for high-speed local area networks or data centers, which operate at 1 gigabit per second (Gbps) or higher. Many cables installed today contain high-bandwidth OM3 or OM4 fiber intended for upgrades to 10, 40 or even 100 Gbps in the future. READ MORE
October 2010
Outside plant contractors often need to install aerial cables, requiring specialized components, knowledge and skills. How familiar are you with aerial fiber installations? Correct answers and explanations are in red. 1. The biggest concern for all fiber optic cables that are installed aerially is __________. A. Wind loads B. Ice loads C. Long-term tension loads D. READ MORE
September 2010
The required test for every installed cable plant is loss or, to be more specific, insertion-loss testing with a light source, power meter, reference cables and mating adapters. READ MORE
September 2010
At the Fiber Optic Association (FOA), we get many technical questions from contractors, installers and end-users (www.foaguide.org). This month’s quiz includes real questions we’ve been asked recently. Can you answer them? Answers and explanations are in red. 1. We’re installing a fiber optic backbone with patch panels on each end. READ MORE
August 2010
The electrical contractor’s role in fiber optic design/build projects is important. In the last few years, there have been many changes in optical fiber technology to accommodate the need for faster network speed for transfering increasingly large amounts of data. READ MORE
August 2010
Splicing fiber optic cables is the main means of connecting fibers in outside plant installations and is even used in some premises applications, but it is not as familiar to many installers as the termination process. How well do you know splicing? Answers and explanations are in red. 1. Splicing is a(n) __________ joint between fibers while connectors __________. A. READ MORE
August 2010
Testing the loss of an installed fiber optic cable plant involves checking the loss of the fiber itself, plus any splices and terminations added during installation. Insertion loss—expressed in decibels (db)—is measured by coupling a test source to the fiber and recording how much light is lost when transmitted through the fiber. READ MORE
July 2010
I’m often asked technical questions about copper and fiber optic cabling. The majority are about problems troubleshooting cabling systems or networks. Some have simple answers but not all. Here are some questions we’ve been asked; see if you can answer them. Answers and explanations are in red. 1. READ MORE

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