H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/1, 345/11
H04B 10/158 (2006.01) G02F 2/00 (2006.01) H01S 5/06 (2006.01) H01S 5/50 (2006.01)
Patent
CA 1262261
AN OPTICAL MIXER FOR UPCONVERTING OR DOWNCONVERTING AN OPTICAL SIGNAL Abstract The present invention relates to an optical upconverting or downconverting gain or loss modulating mixer and a receiver for subcarrier optical communication systems using this mixer. The optical mixer can be formed, for example, from an optical amplifier including a semiconductor laser chip comprising a p-n junction with an active region channel formed along the junction. An optical signal received from the communication system is directed into one end of the channel, and a combination of a D-C bias signal and a local oscillator signal is concurrently impressed on the chip to gain-modulate the received optical signal and produce an upconverted or downconverted output signal. In the receiver, the upconverted or downconverted output signal from the gain-modulated optical amplifier is detected by a photodetector, amplified if necessary, filtered and then demodulated before transmission to the output utilization device. A loss modulator provides similar optical mixing but does not provide a gain to the output signal.
545702
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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