Optical receivers

Details Optical receivers Optical receivers

1984-09-21

1987-03-03

Orsino, Jr., Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455608, H04B 900

Patent

active

046481346

ABSTRACT:
An optical receiver comprises a local oscillator which produces an output signal having a frequency which differs by a predetermined amount from the frequency of an incoming phase-modulated coherent light signal having a "1" and "0" signal bits, mixing means for mixing the local oscillator output with the incoming signal and switching means effective for switching the mixed signal to respective detectors and the mixed signal frequency whereby the major proportion of the power content of the mixed signal during a "1" bit period is fed to one of the detectors and the major proportion of the power content of the mixed signal during a "0" bit period of the mixed signal is fed to the other detector.
In an alternative arrangement the output from the local oscillator is phase-modulated at the intermediate frequency before the mixing operation.

REFERENCES:
patent: 3320013 (1967-05-01), Johnson
patent: 3353896 (1967-11-01), Blattner
Philipp et al.-"Costas Loop Experiment"--IEEE Trans. on Comm., vol. COM 31, No. 8, Aug. 1983, pp. 1000-1002.
Favre-"Progress Towards Heterodyne"--IEEE Jour. on Quantum Elec., vol. QE-17, No. 6, Jun. 1981, pp. 897-905.
Cross-Optically Controlled Two Channel Integrated Optical Switch, IEEE Jour. of Quantum Elec.-vol. QE 14, No. 8, Aug. 1978, pp. 577-580.

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