Abstract

We report an optical coupler suitable for use as an access coupler in a data bus T-system with single multimode fibers as transmission lines. The in- and out-coupling factors are determined by a lateral displacement of the main trunk-fibers which are butt joined. The fabrication of the coupler takes advantage of a simple, sufficiently reproducible, and cheap planar photolithographic process. Using fibers with 100-μm o.d. and 90-μm core diam a total insertion loss of about 1.5 dB and an out-coupling of about –14 dB was measured with a lateral displacement of 20 μm.

© 1977 Optical Society of America

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