Optical: systems and elements – Optical computing without diffraction – Logic gate
Patent
1997-06-05
1999-12-07
Spyrou, Cassandra
Optical: systems and elements
Optical computing without diffraction
Logic gate
359900, 25022727, 356345, G02F 300
Patent
active
059992840
ABSTRACT:
An optical logic device is provided by an interferometer in which an output optical signal is determined in accordance with an interference condition of the interferometer. The interference condition is reset by an optical setting signal which is counter-propagated through a semi-conductor optical amplifier forming one arm of the interferometer. Latching of the interference condition in the set state is achieved by a feedback signal taken from the output optical signal and combined with the setting signal. Resetting of the interference condition is achieved by nulling the output optical signal by counter-propagating a reset optical signal via second semiconductor optical amplifier constituting the second arm of the interferometer. Alternatively the input optical signal to the interferometer may be interrupted to null the output. A further alternative arrangement utilizes an electrical re-setting signal which actuates an electrical phase shifting device in the second arm of the interferometer. The device has particular application to all optical control of high bit rate communication signals.
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Jr. John Juba
Northern Telecom Limited
Spyrou Cassandra
LandOfFree
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