Frequency self-stabilized optoelectronic oscillator based on phase-shifted grating

Abstract

The invention aims at solving the problem of frequency drift of a traditional photoelectric oscillator in the prior art, caused by environment temperature change, and provides a phase shift optical grating based frequency self-stabilization photoelectric oscillator. The phase shift optical grating based frequency self-stabilization photoelectric oscillator structurally consists of a laser device, an isolator, an optical coupler, a phase shift optical grating, an electro-optical modulator, a dispersion compensation fiber, a detector I, a microwave amplifier, a microwave filer, a microwave power divider, a detector II, an adder, a loop filter and a detector III. The optical coupler is a 2*2 coupler. The adder adopts a dual-input single-output mode. The dispersion coefficient of the dispersion compensation fiber is a negative value. The laser device is a DFB semiconductor laser device. The adder can conduct reverse adding on output signals of the detector II and the detector III. The phase shift optical grating based frequency self-stabilization photoelectric oscillator has the advantages of avoiding the problem of the frequency drift of the traditional photoelectric oscillator, caused by environment temperature change.

Description

[0001] field of invention [0002] The invention relates to a photoelectric oscillator, in particular to a photoelectric oscillator with frequency self-stabilization based on a phase shift grating. Background technique [0003] Optoelectronic oscillator is a new type of high-performance oscillator based on microwave photon technology to generate microwave or millimeter wave signals. Compared with traditional signal generation devices based on electronic technology, optoelectronic oscillator has the following significant advantages: higher frequency, easy to Expansion, low phase noise, independent of frequency, better anti-vibration performance, easy miniaturization and optoelectronic integration, and easy remote transmission and distribution of generated signals (see L. Maleki, "The optoelectronic oscillator", Nature Photonics, 2011,5 (24):728-730.). [0004] For the oscillator, the higher the Q value of the energy storage, the lower the phase noise of the signal generated by...

AI Technical Summary

Problems solved by technology

[0005] First of all, for an optoelectronic oscillator based on an optical resonator, when the Q value of the optical resonator reaches the order of 109 or 1010, the phase noise of the microwave signal generated by the optoelectronic oscillator is higher than that of an optoelectronic oscillator based on a long optical fiber 20 ~ 30dB, compared with the traditional microwave oscillator, the phase noise level is almost the same. At this time, the photoelectric oscillator based on the optical resonator has no advantages at all

For optoelectronic oscillators based on long optical fibers, increasing the length of the optical fiber can effectively increase the energy storage time of the optoelectronic oscillator, that is, increase the Q value of the energy storage, thereby significantly reducing the phase noise of the signal, but increasing the length of the optical fiber will bring another The problem is that as the length of the fiber increases, the frequency of the signal generated by the oscillation will be more seriously affected by the ambient temperature: when the ambient temperature changes, the effective refractive index of the fiber will change, and the energy storage time of the fiber will change. The longer it is, the more obvious its energy storage time changes with temperature, so the frequency drift of the signal generated by the photoelectric oscillator is more serious

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