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We present a 4/spl times/4 surface-normal wavelength-selective nonblocking crossbar using polymer-based volume holograms and substrate-guided waves. A prototype device is demonstrated using the center wavelengths of 750, 780, 810, and 840 nm. The employment of wavelength-division multiplexer and of address coding reduce the required 16 wavelengths to four while maintaining the 4/spl times/4 interconnects. Diffraction efficiencies of 85%, 83%, 79%, and 82% are experimentally confirmed for randomly polarized light at 750, 780, 810, and 840 mm, respectively. The measured crosstalk is less than -24 dB.
Date of Publication: Nov. 1998