Optoelectronic reference X-band oscillator for radar systems

We present the design and results of studying the characteristics of an optoelectronic microwave oscillator in the free-running regime are presented, propose a method for synchronising it with a signal of a highly stable crystal oscillator using a phase-locked loop, and analyse the results of an exp...

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Bibliographic Details
Published in:Quantum electronics (Woodbury, N.Y.) N.Y.), 2021-03, Vol.51 (3), p.254-259
Main Authors: Chizh, A.L., Mikitchuk, K.B., Skotorenko, I.V.
Format: Article
Language:English
Subjects:
Crystal oscillators
Frequency stability
Low level
Microwave oscillators
Noise levels
Optoelectronics
Phase locked loops
Radar equipment
Stability analysis
Superhigh frequencies
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Summary:We present the design and results of studying the characteristics of an optoelectronic microwave oscillator in the free-running regime are presented, propose a method for synchronising it with a signal of a highly stable crystal oscillator using a phase-locked loop, and analyse the results of an experimental study on the frequency instability of an optoelectronic microwave reference oscillator. The optoelectronic microwave reference oscillator with optical gain and a 10 GHz oscillation frequency simultaneously provides ultra-low phase noise (less than – 142 dB Hz −1 ) at a 10 kHz frequency offset from the microwave carrier and a low level of spurs in the oscillation spectrum (no more than – 94 dBc). In this case, the temperature coefficient of the oscillation frequency is determined by the temperature instability of a highly stable crystal oscillator.
ISSN:1063-7818
1468-4799
DOI:10.1070/QEL17442