Fiber Height Variation

Published: April 23, 2019

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When polishing an MT ferrule, it is virtually impossible to polish an array of fibers to EXACTLY the same heights. There will always be some deviation in height between fibers in the array. But, when the fibers and ferrule are mated and under load, they undergo a degree of compression/distortion that allows for sufficient fiber-to-fiber contact to be achieved, as long as the fiber height variation is not TOO much.

How much fiber height variation is “too much”? This is (among other characteristics) what the standards bodies attempt to define (see IEC 61755-3-31:2015). Originally, the fiber height variation specifications set forth by IEC involved only max-min heights of all fibers, and the height differences between adjacent fibers. Recently, Minus Coplanarity was added to the specification.

READ THE BLOG: MT Ferrule Geometry Specifications: Minus-Side Coplanarity in IEC 61755-3-31:2015

Additional resources from the FOC team include:

Category Resource:
- FOC Polish Page
View the Glossary, Acronyms, Military Specifications for Connectors
Q&A Resource: email technical questions to AskFOC@focenter.com

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About Fiber Optic Center, Inc.

Fiber Optic Center, Inc., (FOC), is an international leader in distributing fiber optic components, equipment and supplies and has been helping customers make the best cable assemblies in the world for over two decades. Several areas of specialization and expertise, in which they are the industry leader, make them the preferred choice for many of the world’s fiber professionals. In these key technology areas, FOC is "at least as technical as the manufacturer" about the products they sell. Striving to "make the business part easy," they offer outstanding and personal customer service, low or no minimum purchase order values, and from-stock delivery on industry-leading products and technology. FOC is the industry connection to the most innovative optical products, technologies and technical experts who integrate their manufacturing knowledge and vast experience into customers' worldwide operations. @FiberOpticCntr

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