Canadian Electrical Industry News Week

September 28, 2016

International standards development organizations including ISO/IEC and ANSI/TIA are updating several key standards documents that affect field-testing of fibre optic cabling. In particular the standards now describe the use of encircled flux compliant light sources.

Encircled flux refers to the distribution of light exiting the launch fibre of a light source used for testing. An ideal launch condition is one where light intensity is an even radial pattern across the face of the launch fibre. The purpose of the standards is to ensure that different test systems from any manufacturer report the same loss for a given cable under test.

Variation in LED and VCSEL launch patterns means that the optical power injected into the cable under test can result in variances in measured power loss values depending on connector alignment or the rotation of the launch cable. This is especially critical in multimode systems where the large fibre core will accept the uneven distribution from the light source and couple it into the cabling under test.

Figure 1 depicts the output from an LED into the launch fibre. While the light is distributed axially through the fibre, the intensity is much higher at the edge of the core (represented by a darker red colour) and a noticeable amount of power is present in the cladding (outer ring), creating an overfilled launch condition.

The results are artificially high loss readings when mandrels are not used on the launch cable or when there is mild misalignment between two connectors.

The reasons are that light in the cladding attenuates very quickly, and if this jumper were connected to the power meter during calibration, the light in the cladding will be detected, though it will dissipate in the cable under test and result in a high insertion loss measurement.

Additionally, when the core is overfilled, small misalignments between two connectors can result in abnormally high loss. Especially if the power distribution is weighted to the outside of the core as depicted in Figure 1.

Figure 2 depicts the output from a VCSEL, which is a low cost laser used in multimode systems to provide higher bandwidth at longer distances. A VCSEL typically has an elongated output that creates a “blade” of light in the fibre core that maintains its shape as it propagates down the cable.

VCSELs also produce spots of high intensity light that further reduce the even distribution of power. In this diagram the spots appear to be dirt, but are actually intense modes (beams) of light.

Rather than try and control the output pattern of LEDs and VSCELs, the solution to the problem is to use specialized launch cables (in the past called mode conditioning cables) that accept an uneven light pattern, scramble it and emit an even light pattern.

These cables can be used with virtually any LED light source and make it encircled flux compliant. While these specialty cables are expensive, they have the benefit of allowing installers to keep their existing multimode light sources and make them encircled flux compliant by simply replacing the launch cable.

Figure 3 depicts an encircled flux launch cord connected to a light source. This cord replaces the standard launch cord when testing the installed cabling. The output from the EF launch cord into the fibre under test has an even distribution pattern that does not extend into the cladding of the fibre. Because the distribution pattern depends on whether the fibre core is 50 or 62.5 micron, the EF cord used for testing must match the core size of the fibre under test.

 

 

 

 

 

 

 

 

 

Multimode fibre optic systems do have limitations when compared to single-mode, but their key advantage is the lower cost of the active equipment in the system. And as multimode systems support data rates of 100Gb/s and more, the loss budgets become increasingly stringent.

Therefore, installers need to utilize every tool and technology available to ensure they obtain accurate test data and give themselves the best probability of a problem-free testing experience.

While the encircled flux testing requirements will slowly make its way into contracts and testing requirements, installers should not delay in ensuring the test cords that accompany their power meters and light sources are made with reference grade connectors.

One last note; even the best connectors, launch cables and testers are useless if the end faces are not kept perfectly clean. It’s critical that technicians apply best practices and clean the ports of the test equipment and test cords every time they are used.

When combined, reference-grade connectors/cords, encircled flux compliant launches and clean connectors will provide the best possible testing experience resulting in fewer failed tests and less time spent troubleshooting.

This article was first published online by Ideal Networks: www.idealnetworks.net/US/EN/News/Using-Encircled-Flux-Compliant-Light-Sources-for-Testing-Fiber-Optic.aspx.

 

 

Changing Scene

  • Prev
ESA’s response team has been working diligently to address the emerging issues. We are moving into ...
Littelfuse invites plant engineers, facility managers, and maintenance professionals to join its ...
This recall involves Legrand / Pass & Seymour commercial-grade tamper resistant duplex ...
In response to the current COVID-19 crisis, IDEAL Canada was looking for ways to contribute to the ...
Join Nexans for a free webinar as Isaac Müller, Applications Engineer for Nexans discusses this ...
IDEAL INDUSTRIES has made the difficult but necessary decision to cancel the original ...
The Regional Electrical Inspector performs physical inspections on all types of electrical ...
The Alberta Electrical Alliance (AEA) released a video message from their Provincial Board of ...
A new white paper published by Mohawk College’s Energy and Power Innovation Centre explains how ...
With the COVID-19 crisis underway, EFC is working diligently to provide current electrical ...

Vallen CanadaIn the midst of the pandemic crisis, safety & MRO specialist Vallen Canada moved its 6,000 square foot West Edmonton, Alberta branch to a new 20,000 square foot location, enabling the branch to triple its inventory. How did the company keep everyone safe during the transition? Vallen Canada simply relied on its own expertise.

“We had to really do a good gut check on whether this was the right decision to move the branch during the pandemic,” says Vallen Canada President Karen Chester. “The reality is the show must go on… our culture is such that we pull together in tough times and we need to get the job done. The final step in the process was to make sure we keep people safe.”

Read More

 

Emergency HospitalsAs the battle against COVID-19 continues, medical providers all over the world are expanding their capacity to treat patients through the construction of temporary hospital facilities and tents. Eaton and its partners recently helped realize a project by the United States Army Corps of Engineers at Stony Brook University Hospital in New York, supplying essential power distribution equipment for four temporary medical facilities with the capacity to treat more than 1,000 patients. Construction on the facility is expected to be completed this week, with nearly 100 Eaton heavy-duty safety switches providing reliable power distribution to support life-saving ventilators and other devices.

Read More

 

 

Step-Down TransformersBy Max Ezzati

Step-down transformers allow any electrical product to be installed on 347V circuits, which is why many electrical contractors keep a few in their car stock. Selecting the correct step-down transformer ensures the physical dimensions of the transformer are as small as possible to fit easily in the junction box while keeping costs as low as possible. Here are our tips on selecting the best step-down transformer for your job.

 

 

Read More

 

 

Product News

  • Prev
In 2020, Louis Poulsen and BIG Ideas present a comprehensive new lamp series, Keglen, especially ...
Architectural sound absorbing 100% Merino Wool Felt. Made from carbonized wool treated with ...
Universal Lighting Technologies recently introduced 180W PWX LED drivers. These drivers are ideal ...
Venture Lighting International has partnered with Synapse Wireless to enhance the capabilities of ...
In its aim to develop high-performance, long-lasting, and robust lighting solutions, LUBO Lighting, ...
The highly-efficient Juno® UPLD swivel LED undercabinet in 9, 14, 22 and 30” lengths have an easily ...
Lumenpulse has launched the Lumenblade family: a collection of contemporary classic rectilinear ...
The Lithonia Lighting FML4W is a new wide housing LED Wraparound. While suitable for new ...
Douglas Lighting Controls, a member of the Panasonic family of companies, recently introduced the ...
Arlington's new low profile 5x8" TV Box™ features a steel back box for use with MC, AC and flexible ...

 

Louis Poulsen Lamp SeriesIn 2020, Louis Poulsen and BIG Ideas present a comprehensive new lamp series, Keglen, especially characterised by its distinctive design as well as classic superior lighting quality.

The key pieces in the Keglen series are four pendants (Ø175), (Ø250), (Ø400) and (Ø650) that each provide their very own diffusion of light using a curved glass insert, which is built into and adapted to each version of the shade.

The main feature of the lamp is the organic shaped glass that sits perfectly beneath the cone as a small water droplet shaped by physics and cohesive forces in nature, says Jakob Lange, Partner, BIG Ideas.

 

Read More

Universal Lighting EVERLINE PWX LED DriversUniversal Lighting Technologies recently introduced 180W PWX LED drivers. These drivers are ideal for outdoor luminaire applications, such as street, roadway and site area lighting, as well as, indoor highbays using non-Class 2 drivers.

“As the outdoor and industrial lighting segments continues to expand, Universal is focused on providing solutions that help our customers capture more market opportunities by increasing controllable options,” said Kevin Boyce Director of Product Management for Universal. “The PWX drivers are available with 12Vdc or 24Vdc auxiliary power for lighting applications with on-board sensors or radios.”

Read More

 

Peers & Profiles

  • Prev
Hazmasters was founded with a dedication and focus on creating safer work environments. It is ...
ELG Electric is an electrical contractor based out of Goderich, Ontario serving the area’s ...
Founded by Warren Osak, Electromate specializes in Robotic and Mechatronic Solutions, distributing ...
 Will West is a first-year apprentice working in the solar industry with Hakai Energy ...
“It’s definitely the Olympics of our trade,” said Lance Giesbrecht of the Ideal National ...
Tommy Carducci is a 14-year industry veteran working with Seneca Electrical and was one of 18 ...
Legend Power Systems is an innovative Canadian company headquartered out of Vancouver, B.C. Their ...
Founded in 1942, Franklin Empire is Canada’s largest independent electrical distributor.   ...
Nick Foster is Territory Manager, New Brunswick & P.E.I for Leviton. Foster was recently ...
Held from November 7th to 9th in Orlando, Florida and aired on ESPN 2, the Ideal National ...

HazmastersHazmasters was founded with a dedication and focus on creating safer work environments. It is distributor of safety products servicing customers in the industrial, construction, commercial, institution, and government markets.

The company supplies safety products, conduct safety inspections and tests, as well as service and repair safety products it. A company that educates and trains. A company that delivers every aspect of workplace safety to the employer and follows up to make those solutions easy to implement and sustain.

 

Read More

 

 

Copper $US Dollar price per pound

Kerrwil Publications Great Place to Work. Certified December 2019 - December 2020

538 Elizabeth Street, Midland,Ontario, Canada L4R2A3 +1 705 527 7666
©2020 All rights reserved

Use of this Site constitutes acceptance of our Privacy Policy (effective 1.1.2016)
The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of Kerrwil