MT Ferrule Geometry Measurements

Published: November 5, 2018

, Last updated: September 17, 2025

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In regards to MT ferrule geometry measurements, Minus Coplanarity (or Minus-Side Coplanarity) is one way to describe how “flat” or “co-planar” an array of fibers is to ensure minimum optical performance requirements of the telecom world, it is important to ensure that all fibers in a mated pair of connectors will have good contact. It is intuitive that if all fibers of both ferrules are exactly on the same horizontal plane, then all fibers will likely mate well when connected.

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

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