Wavelength-division multi/demultiplexer utilizing optically active crystals

A wavelength-division multi/demultiplexer (W-MUX/DEMUX) utilizing optically active crystals is proposed and studied. It is shown that using two or more optically active crystals having different rotary powers and dispersions is effective for providing design freedom and for easy assembly of the W-MUX/DEMUX. A design for a two-wavelength W-MUX/DEMUX is also discussed. Based on this design, a W-MUX/DEMUX that multiplexes or demultiplexes light with wavelengths of 0.8 and 1.1 mu m was fabricated. The insertion losses are 1.6 and 3.1 dB at wavelengths of 0.8 and 1.1 mu m, respectively. Crosstalk attenuation of 13 dB or more is obtained at these wavelengths.<
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