Multiport Optical Bare-Fiber Connector for Parallel Optical Interconnect Module

Yasuhiro ANDO  Mitsuo USUI  Nobuo SATO  Kosuke KATSURA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E82-C   No.1   pp.72-80
Publication Date: 1999/01/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Electromechanical Devices and Their Materials)
Category: 
Keyword: 
optical connector,  optical interconnection,  optical fiber,  buckling,  optical module,  

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Summary: 
A high-density multi-port optical connector that exploits the flexibility of bare optical fibers has been developed for use as an optical interface of a parallel optical interconnection module. In the BF (Bare-Fiber) connector, 24 multimode-fibers are mated by direct physical contact in micro-glass-capillaries with a 250-µm pitch. The buckling forces of the optical fibers themselves secure the physical contact. Optical fiber buckling is investigated theoretically and experimentally. A new design method to optimize the span length l and the longitudinal displacement ΔL for the buckling is also proposed based on the requirements afor optical characteristics, mechanical reliability, and dimensional tolerances, etc. A prototype BF connector with l 10 mm and ΔL of 50 µm was designed and fabricated for multimode fiber connections. This connector provides high optical performance: an average insertion loss of 0.05 dB and a return loss of over 35 dB at 850 nm. The optical performance remained stable after a durability test with ten connection-repetitions.