Wavelength demultiplexer that uses an interference filter and achromatic quarter-wave plates.
A new two-channel demultiplexer structure for closely spaced wavelength-division-multiplexing systems is proposed. The demultiplexer is constructed with an interference filter and achromatic quarter-wave plates. Its feature is that wavelength-multiplexed light falls normally upon the filter. Two demultiplexers coupled with single-mode fibers are fabricated. Their measured insertion losses are 1.8 and 2.8 dB.
Fujii
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NTT Transmission Systems Laboratories, 1-2356 Take, Yokosuka-shi, Kanagcwa 238-03, Japan.