Stable microwave oscillator

Abstract

The invention discloses a stable photoelectric oscillator. The stable photoelectric oscillator comprises a laser device, an electro-optical modulator, a long optical fiber, a photoelectric detector, an amplifier, an electric band-pass filter, an electrically-controlled microwave phase shifter, a high-stability microwave source, a 2*1 wave combiner or directional coupler, a first 1*2 power divider or directional coupler, a second 1*2 power divider or directional coupler, a third 1*2 power divider or directional coupler and a phase locking control module, wherein the phase locking control module comprises a frequency mixer, an electric low pass filter and a servo control module, the output end of the frequency mixer is connected to the input end of the electric low pass filter, and the output end of the electric low pass filter is connected to the input end of the servo control module. According to the stable photoelectric oscillator, an electric injection of the external high-stability microwave source and a phase locking control mechanism are added based on a traditional single-loop OEO structure. Compared with the prior art, the stable photoelectric oscillator has the advantages that insertion loss of an optical link in a resonant cavity is not increased, the high signal to noise ratio of the photoelectric resonant cavity is maintained, and the structural complexity of the stable photoelectric oscillator is lower than that of an existing scheme. The stable photoelectric oscillator is easy to obtain.

Description

Technical field [0001] The invention belongs to the technical field of microwave and optoelectronics, and in particular relates to a photoelectric oscillator. Background technique [0002] Optoelectronic Oscillator (OEO: Optoelectronic Oscillator) is a new type of oscillator that uses optical energy storage elements with high quality factor (Q value) to replace traditional microwave energy storage elements. It is characterized by generating microwave signals with pure spectrum. The phase noise of the oscillating signal is much smaller than that of current electrical oscillators. The basic structure of OEO was first proposed by X.Steve Yao and Lute Maleki in 1994, including a laser and an electro-optic modulator, a long optical delay line (such as optical fiber, etc.), a photodetector, a microwave amplifier, a A closed feedback loop formed by the band-pass filter, wherein the output signal of the band-pass filter is fed back to the microwave input terminal of the electro-opt...

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the limitations of the existing OEO technical solutions and solve the defects that the existing OEO solutions cannot take into account both stability and spurious mode suppression or will introduce additional noise to cause the phase noise deterioration of the OEO oscillating signal, the present invention provides a low additional noise , OEO technical solution that can take into account stability and stray mode suppression, simple structure and easy to implement

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