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One of the questions I get asked about regarding optical cable measurements is: “Why don’t my OTDR and jacket length markings agree?”

The answer depends on the type of cable being made. In the old days (when you and I were a lot younger) the normal procedure was for a loose tube cable to be stranded and have a small amount of excess length in the tube.

Also, since the tube was following a helix around a central anti-buckling member, the overall fiber path was longer than the cable length.

While many of these cables are still being made and the excess length of fiber over jacket length is a function of the diameter of the core (larger core/bigger helix), there are now a number of different types of cable designs available that would invalidate that assumption.

READ THE FULL BLOG HERE: http://technicalhorsepowerconsulting.com/optical-cable-measurements-why-dont-otdr-and-jacket-length-markings-agree/

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Wayne Kachmar

About Wayne Kachmar

Wayne Kachmar, President, Technical Horsepower Consulting, LLC Mr. Kachmar has been in the optical cable industry for over 37 years. He has participated in many innovations and seen the maturing of the industry. Over the years, Wayne has been involved in many unique projects to provide optical cable in diverse environments such as the underwater ROV that penetrated the Titanic, as well as cable that is in service sensing sub-atomic particles in the Antarctic ice. Wayne developed a number of unique concepts and products using optical fibers as both information carriers and sensors where the cable became the sensor. These have included fiber laser ring gyroscope components and distributed acoustic sensors for terrestrial and underwater applications. As a principal investigator for many government sponsored projects, he has developed methods that push the state of the art in optical cable design and manufacture. Over his career, Wayne has been able to fuse this state of the art knowledge with conventional fiber cable design to significantly cost reduce both materials and processes. With over 50 granted patents in fiber optic cables, connectors and tools and over 60 patents published or in process, Wayne’s path to TE Connectivity started when he founded and ran Northern Lights Cable, Inc. in 1988. He sold the company to Prestolite Wire in late 1997 continuing as division CEO until 2000. In 2000, Prestolite Wire was packaged with other holdings of the owner to become GenTek (a publicly held company), which also acquired Krone that year. Wayne’s position transitioned to Director of R&D, managing the RD&E center. In 2004, all Krone divisions were acquired by ADC who itself was acquired by TE in December 2010. In 2012, Wayne was named a TE Fellow in electro-optic engineering based on the length and depth of his technical knowledge and accomplishments. This is the highest technical title within the TE structure with less than 20 persons worldwide out of 8000 scientists and engineers within TE. In 2015, Wayne incorporated his consulting company Technical Horsepower Consulting, LLC. And joined Fiber Optic Center, Inc. as their Optical Cable Technical Expert. Follow @TechHorsepower