Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural a.f.s. for a single oscillator
Patent
1993-06-01
1994-04-12
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Plural a.f.s. for a single oscillator
331 17, 331 23, 331 25, 331 36C, 331 66, 331117D, 331177V, 332128, 332130, 332136, H03B 518, H03C 322, H03L 7093, H03L 724
Patent
active
053029186
ABSTRACT:
A fundamental or subharmonic optically injection locked oscillator is coupled to a phase locked loop circuit. The injection locked oscillator has two single stage HEMT amplifiers with parallel feedback from the drain of a second transistor to a gate of a first transistor. A feedback resonant network controls the oscillator frequency. A microwave/millimeter wave source modulates a laser diode and the signal from the laser diode is then transmitted via an optical fiber to a PIN photodetector diode. The signal from the photodetector diode is injected into the oscillator at an nth subharmonic of the oscillator frequency. The feedback network may consist of a microstrip gap resonator with two tuning varactors at the ends of the resonator. The phase locked loop includes a balanced mixer used as a phase detector to compare the nth harmonic of the signal from the photodetector diode to the sampled output of the oscillator. The output of the mixer is applied to the varactor diodes after being filtered, and a voltage reference is added to the filtered signal to prebias the varactor diodes to the desired frequency of operation.
REFERENCES:
patent: 4074209 (1978-02-01), Lysobey
patent: 5144261 (1992-09-01), Harvey et al.
Esman et al, "Optical Phase Control of an Optically Injection-Locked FET rowave Oscillator", IEEE Transactions on Microwave Theory and Techniques, vol. 37, No. 10, Oct. 1989; pp. 1512-1518.
Mizuno, "Microwave Characteristics of an Optically Controlled GaAs MESFET", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-31, No. 7 pp. 596-599, Jul. 1983.
de Salles, "Optical Control of GaAs MESFETs", IEEE Transactions on Mircowave Theory and Techniques, vol. MTT-31, pp. 812-820, Oct. 1983.
Gautier et al, "Optical Effects of the Static and Dynamic Characteristics of GaAs MESFET", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-33, pp. 819-822, Sep. 1985.
Higgins, "Direct Optical Subharmonically Injection-Locked MESFET Oscillators", Microwave and Optical Technology Letters, vol. 6, No. 1, Jan. 1993, pp. 33-36.
Daryoush Afshin S.
Higgins Thomas P.
Sturzebecher Dana J.
Anderson William H.
Grimm Siegfried H.
The United States of America as represented by the Secretary of
Zelenka Michael
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