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All-optical holographic code division multiple access switch

Image Number 13 for United States Patent #6844947.

A technique for processing optical input signals to produce optical output signals using only a single hologram for a plurality of circularly shifted code words used to encode the input signals. A spatial light modulator coupled to the each of the optical input signals encodes a corresponding one of the input optical signals, and the optical signals are linear combined for further processing. A matched filter composed of the single hologram receives the linear combination, and a two-dimensional microlens arrangement coupled to the matched filter emits each of the optical output signals from a corresponding microlens in the arrangement. Switching is engendered by controlling each spatial light modulator to thereby direct each input signal to the desired one of the microlens in the arrangement.

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