Optical connector and optical connection structure

The optical connector's innovative ferrule design addresses stress-induced bending issues in multi-core fiber networks by strategically positioning the adhesive injection hole, reducing optical loss and enhancing connection stability.

WO2026140819A1PCT designated stage Publication Date: 2026-07-02FUJIKURA LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
FUJIKURA LTD
Filing Date
2025-12-08
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

The application of multi-core fibers in communication networks is hindered by increased optical loss due to stress-induced bending of small diameter portions of optical fibers caused by adhesive curing shrinkage, particularly when using fan-in and fan-out devices.

Method used

The optical connector design features a ferrule with a fiber hole configuration that avoids forming the adhesive injection hole in regions orthogonal to the small diameter portion, using a D-shaped cross-section and strategically positioning the injection hole to reduce stress on the small diameter portion, along with a resin ferrule material for precise alignment.

Benefits of technology

This design effectively suppresses optical loss by minimizing stress-induced bending of small diameter fibers, ensuring stable connections and reduced insertion loss across various wavelengths.

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Abstract

An optical connector includes a ferrule having a fiber hole, a plurality of optical fibers that are inserted into the fiber hole, and an adhesive that fixes the plurality of optical fibers to the ferrule. Each of the plurality of optical fibers has a bare fiber and a coating that partially covers the bare fiber, a portion of the bare fiber that is exposed from the coating has a small diameter portion that is located inside the fiber hole and a large diameter portion that has a larger diameter than the small diameter portion, an injection hole for injecting the adhesive is not formed in a region of the ferrule orthogonal to a longitudinal direction of the fiber hole from the small diameter portion, and an injection hole is formed in a region of the ferrule orthogonal to the longitudinal direction from the large diameter portion.
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