A wavelength selective optical switch particularly usable as a programmable N.times.M optical switch in a multi-wavelength communication system. The switch uses a grating that separates multi-channel optical signals into a plurality of optical channels, and combines a plurality of optical channels into multi-channel optical signals. Programmable mirrors switch each optical channel to any of a plurality of fibers coupled to the switch.

 
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> Transmission gratings designed by computed interference between simulated optical signals and fabricated by reduction lithography

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