Microwave oscillator based on sapphire filter

Abstract

The invention discloses a microwave oscillator based on a sapphire filter. The microwave oscillator comprises a laser unit 1, an electrooptical modulator 2, an optical fiber delay 3, the sapphire filter 4, an optical amplifier 5, an optical detector 6, a microwave amplifier 7 and a microwave power coupler 8, wherein the laser unit 1 is used for outputting an optical carrier wave signal; the electrooptical modulator 2 is used for modulating the optical carrier wave signal; the optical fiber delay 3 is used for regulating a phase between optical paths; the sapphire filter 4 is used for filtering an optical signal and an electric signal; the optical amplifier 5 is used for amplifying the optical signal filtered by the sapphire filter; the optical detector 6 is used for converting the amplified optical signal into the electric signal; the microwave amplifier 7 is used for amplifying the electric signal filtered by the sapphire filter, so that gain of the microwave oscillator is greater than an oscillation threshold value; and the microwave power coupler 8 is used for outputting a microwave signal. The microwave oscillator is an optoelectronic oscillator with an optical filter and an electric filter, and has the advantages of a compact structure, low cost, and low medium-far end phase noises.

Description

technical field [0001] The invention relates to the field of optoelectronic information. More specifically, it relates to a microwave oscillator based on a sapphire filter. Background technique [0002] Microwave frequency sources with low phase noise and high stability are widely used in radar, communication measurement and other fields. The low-temperature (4k) sapphire microwave frequency source has extremely low phase noise (in the X-band, <-160dBc / Hz10kHz) and excellent short-term stability (<1E-151s), but due to the high cost and maintenance costs of the low-temperature sapphire microwave source, And bulky, currently only suitable for laboratory environments. The photoelectric oscillator adopts photoelectric feedback loop technology to convert laser energy into microwave signal energy. The photoelectric oscillator is a high-performance microwave signal generator. noise. Compared with traditional oscillators, optoelectronic oscillators have extremely low phase...

AI Technical Summary

Problems solved by technology

The structure of electro-optical separation leads to the insufficient compact structure of the oscillator, the performance of electrical filtering is not high, and the Q value is low.

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