Optical democulator

Details Optical democulator Optical democulator

1992-07-16

1994-09-20

Ben, Loha

Optical: systems and elements

Optical demodulator

250551, 385 1, G02F 200

Patent

active

053494652

ABSTRACT:
An optical demodulator includes a nonlinear element which responds to both light and a microwave-submillimeter wave (far infrared radiation). An optical signal modulated by a modulating wave in which a subcarrier consisting of the microwave-submillimeter wave is modulated by a signal wave, and a local oscillated signal consisting of a microwave-submillimeter wave the same in frequency as the subcarrier are added to the nonlinear element, to fetch the signal wave by a heterodyne system.

REFERENCES:
patent: 3403257 (1968-09-01), Petroff
patent: 4856095 (1989-08-01), Rauscher
patent: 5016242 (1991-05-01), Tang
patent: 5039951 (1991-08-01), Cheung et al.
patent: 5214275 (1993-05-01), Freeman et al.
1990 IEEE MTT-S International Microwave Symposium Digest, vol. I, No. G-4, May 8, 1990, pp. 237-240, J. K. A. Everard et al., `Microwave and MM Wave Photo-conductive Three-Wave Mixers for Coherent Detection . . . Signals`.
1991 IEEE MTT-S International Microwave Symposium Digest, vol. III, No. PP-6, Jun. 10, 1991, pp. 1293-1296, T. Newman et al., `A Submillimeter-wave Planar Diode Mixer-Design and Evaluation`.
14th European Conference on Optical Communication (ECOC 88), vol. 2, Sep. 11, 1988, Brighton, UK, pp. 13-16, J. L. Gimlett, `A New Low Noise 16 GHz PIN/HEMT Optical Receiver`.
European Patent Search Report, Jul. 1, 1993.

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