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Wavelength demultiplexer that uses an interference filter and achromatic quarter-wave plates

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Abstract

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.

© 1991 Optical Society of America

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