Carrier and clock recovery for lightwave systems

Details Carrier and clock recovery for lightwave systems Carrier and clock recovery for lightwave systems

1992-09-09

1996-08-13

Chilcot, Jr., Richard E.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359182, 359189, 359191, H04B 1000

Patent

active

055461905

ABSTRACT:
An optical communication system includes a transmitter for generating a subcarrier multiplexed optical signal from a pilot tone, a receiver and an optical fiber for coupling the optical signal from the transmitter to the receiver. At the transmitter, an optical carrier is modulated with a composite modulation signal including a plurality of modulated microwave subcarriers to provide the optical signal and pilot tone for carrier and clock recovery. The receiver includes a local oscillator for generating a local light beam, a detector responsive to the received optical signal and the local light beam for providing a detected signal at an intermediate frequency, and a microwave receiver for receiving the detected pilot tone for simultaneously generating the subcarrier frequencies for demodulating the microwave subcarriers from the detected signal, an automatic frequency control signal for controlling the local oscillator, and the clock signal.

REFERENCES:
patent: 3546465 (1968-05-01), Arnaud
patent: 4910973 (1990-03-01), Mainardi
patent: 4914735 (1990-04-01), Ichiyoshi
patent: 4989200 (1991-01-01), Olshansky et al.
patent: 5134509 (1992-07-01), Olshansky et al.
patent: 5222103 (1993-06-01), Gross
patent: 5245459 (1993-09-01), Faulkner et al.
8 Gb/s QPSK-SCM Using Optical Coherent Detection--Hill & Olshansky, Sep. 9, 1991, ECOC/IOOC 91 Proceedings, Paris, France.

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