Abstract
Wavelength-selective directional couplers offer a convenient way to produce low-loss components applicable to wavelength division multiplexing in optical transmission systems. Asymmetrical fiber couplers (I.e., couplers made of dissimilar fibers) have, compared with symmetrical couplers, the advantage of true bandpass characteristics,1 enabling us to design multichannel multiplexers by a simple series connection of different couplers. Rather wideband couplers with a 3-dB bandwidth of ~100 nm and more have already been constructed.2,3
© 1987 Optical Society of America
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