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Broad passband multi/demultiplexer for multimode fibers using a diffraction grating and retroreflectors

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3 Author(s)
Nishi, I. ; Nippon Telegraph and Telephone Public Corporation, Tokyo, Japan ; Oguchi, T. ; Kato, K.

A broad passband multi/demultiplexer for multimode fibers employing a diffraction grating and retroreflectors is presented. As shown by calculation and experimental results, a passband width proportional to the difference between the retroreflector length and the input fiber core diameter is attainable. Using a standard ( 50/125 \mu m) graded index fiber as the transmission fiber, 1-dB passband widths of 100 nm for the multiplexing channel and 94 nm for the demultiplexing channel with a channel spacing of 125 nm are achieved in a two-channel multi/demultiplexer. The minimum insertion losses for each channel are 2.3 and 2.7 dB, respectively.

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Lightwave Technology, Journal of  (Volume:5 ,  Issue: 12 )