Fast acquisition optical frequency locked loop

Details Fast acquisition optical frequency locked loop Fast acquisition optical frequency locked loop

1992-01-31

1993-01-19

Lobo, Ian J.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359191, 342100, G02B 2600, H04B 1006

Patent

active

051811383

ABSTRACT:
A control loop for matching the frequency of an incoming electromagnetic beam controls a local oscillator with two feedback loops including a coarse loop employing an optical frequency shifted beam to generate a coarse control voltage in nanoseconds and a fine loop employing a fast lock loop filter to generate a fine control signal that provides loop convergence on the order of a microsecond.

REFERENCES:
patent: 3975628 (1976-07-01), Graves et al.
patent: 5046140 (1991-09-01), Yamazaki
Lowney et al., "Frequency Acquisition and Tracking for Optical Heterodyne Communication Systems," J. Lightwave Tech., vol. LT-S, #4.
Scholtz et al., "Realization of a 10-um Homodyne Receiver," J. Lightwave Tech., vol. LT-S, #4, Apr. 1987.

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