Optical mixer for upconverting or downconverting an optical sign

Details Optical mixer for upconverting or downconverting an optical sign Optical mixer for upconverting or downconverting an optical sign

1986-09-29

1988-12-27

Moskowitz, Nelson

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

330 43, 370 4, 455617, H01S 310, G02F 136, H04B 900

Patent

active

047943513

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.

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