Patent ID: 7925131

Claim:
An optical logic gate comprising: first and second optical input ports configured to receive respective optical signals (A, B); an optical output port configured to output an optical signal (P out ); an optical combiner configured to combine the optical signals (A, B) to produce a combination signal having a power (P i ) that is the combination of the powers (P A , P B ) of the optical signals (A, B); a non-linear optical device configured to receive the combination signal from the optical combiner, and to output the optical signal (P out ) from the optical output port based on a characteristic of the non-linear optical device such that the optical signal (P out ) represents the result of a logic function applied to the optical signals (A, B); a logic selector configured to select the characteristic of the non-linear optical device such that the logic function correlates the power of the output signal (P out ) to the power of the combination signal (P i ); and the logic selector comprising a polarization controller in a fiber loop of the non-linear optical device, the polarization controller configured to alter the characteristic of the non-linear optical device to select the logic function.