Abstract
The performance of optical networks may be improved by replacing electronics with optics. For example, in address decoding, the faster optics relative to electronics reduces the optical memory size required for backing up optical data while switch settings are being determined. Approaches and difficulties for all-optical logic and switching are discussed in reference 1. In an earlier paper, reference 2, we proposed using the nonlinear effects of semiconductor optical amplifiers (SOAs) with cross gain modulation (XGM) to construct optically controlled NOT, NOR and NOT-XOR optical logic gates. The NOT-XOR gate was considered new. A further novelty was the assigning of bits of a word to different light frequencies in a bit- WDM system in order to construct a full adder and then a pipelined ripple carry word adder. Cross gain modulation was selected because in a communication system the incoming address signal phase, intensity, and frequency is not sufficiently well defined for coherent operations in an XOR gate. Further cross gain modulation allows frequency shifting. Automatic gain control optical amplifiers adjust the gain for the correct operating point on the SOA saturation curve.
© 2002 Optical Society of America
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