Optical PLL circuit and method of controlling the same

Details Optical PLL circuit and method of controlling the same Optical PLL circuit and method of controlling the same

1997-12-04

1999-04-13

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 1A, 331 66, 327156, 455260, H03L 706

Patent

active

058942475

ABSTRACT:
An optical PLL circuit with high precision that has its simplified configuration. An optical-intensity modulator creates difference frequency information (N.times..DELTA.f) by modulating a received optical signal formed of signal optical pulses of a repetitive frequency (N.times.f0) with a reference signal of a frequency (f0+.DELTA.f) and implementing an AND operation of them. The signal is converted into an electric signal by a photo diode. A band-pass filter extracts only the low frequency component (N.times..DELTA.f). A frequency divider produces a frequency component .DELTA.f by dividing the extracted component by N. A multiplier receives the reference signal and the output signal f of a voltage-controlled oscillator and then creates the difference frequency component ((f0+.DELTA.f)-f). A phase comparator compares the low frequency component .DELTA.f with the difference frequency component ((f0+.DELTA.f)-f) and controls the voltage-controlled oscillator to set the phase difference between them to zero.

REFERENCES:
patent: 5302918 (1994-04-01), Sturzebecher et al.

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