Fiber Diameters

Published: October 9, 2018

, Last updated: September 17, 2025

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Fiber diameters play an important role in the correct amount/volume injected into the connector.

For example, the 900-micron buffered fiber will displace more epoxy than a 250-micron fiber resulting in totally different volumes required to inject into the connector.

In other words, it will take slightly more epoxy for a 250-micron fiber than a 900-micron buffered fiber. Apply the same amount of epoxy for all types of fiber and connectors can lead to problems in the termination. Some of these problems cause reliability issues, bare fiber exposure inside the connector, overflow of epoxy where the mechanical movement (spring action) is locked and preventing optimum contact in mating pairs.

READ THE BLOG: Assuring the correct amount of Epoxy is in the connector

Additional resources from the FOC team include:

Category Resource
- FOC Epoxy Page
- 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

Have questions about this FOC Tip?

Contact FOC with questions at: (800) 473-4237 / 508-992-6464 or email: FiberOpticCenter@focenter.com and we will respond ASAP.

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FOC Tips Fiber Optic Center has a team of technical experts and marketing strategists with decades of years in the field. This team contributes to the fiber, cable and specialty industries coverage through news, alerts, reports and general media information.

About Fiber Optic Center, Inc.

Fiber Optic Center, Inc., (FOC), is an international leader in distributing fiber optic components, equipment, materials, and supplies known for helping customers make the best cable assemblies in the world for over three decades. Material property consultation is provided by technical experts for lapping film, epoxy, adhesives, optical coatings, and optical plastics during application specific material selection. Technical process expertise is offered in several key technology areas. Specialized expertise includes cable assembly line mastery, fiber broadband field installation best practices, and technical advancements in telecom, datacom, data centers, and hyperscale. Optical cable specification development includes design and quality testing. FOC's impact reaches the network physical capabilities through fiber manufacturing process expertise from preform fabrication and shaping, fiber drawing, and coating requirements for double clad fibers used for high power fiber laser applications to solution doping, vapor phase doping, rare earth chelates and halide recipe consultation. Fiber Optic Center is the preferred choice for the world’s fiber professionals as 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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