Oscillators – Automatic frequency stabilization using a phase or frequency... – Oscillator with distributed parameter-type discriminator
Patent
1992-02-10
1993-04-20
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Oscillator with distributed parameter-type discriminator
331 25, 372 32, 372 33, H03L 702, H01S 313
Patent
active
052046400
ABSTRACT:
A circuit for stabilizing an oscillator having an oscillator output signal includes a long optical fiber delay line which receives an optical version of the oscillator output signal and a phase detector sensing the oscillator output signal and the delayed optical output signal through the long optical fiber. The output of the phase detector is fed back to the oscillator's frequency control input to stabilize the frequency. The phase detector and the delay line are a delay line discriminator, and the length of the optical fiber is selected so as to optimize the discriminator's sensitivity against signal attenuation in the optical fiber, the optical fiber length typically being on the order of 10 kilometers. An adjustable phase shifter which maintains phase quadrature at the phase detector inputs at equilibrium is controlled by a tuning microprocessor responsive to an externally controlled change in the frequency at which the oscillator is to be stabilized, so as to follow changes in the selected oscillator frequency. As a result, an oscillator may be tuned in the circuit of the invention to any frequency in the general range of D.C. to optical frequencies.
REFERENCES:
patent: 3614649 (1971-10-01), Gerig
patent: 4042891 (1977-08-01), Levine
patent: 4336505 (1982-06-01), Meyer
California Institute of Technology
Grimm Siegfried H.
Wallace Robert M.
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