Method for generating single-frequency oscillating microwave signal and single-frequency oscillating microwave signal source

Abstract

A method for generating a single-frequency oscillating microwave signal and a single-frequency oscillating microwave signal source, based on the following technical idea: applying the principle of stimulated Brillouin scattering and constructing an intensity modulation subsystem based on an electro-optic phase modulator to replace the electro-optic intensity modulation in an optoelectronic oscillator and use the intensity modulation subsystem to realize the electro-optic intensity modulation function; stimulate the Brillouin scattering by exciting the nonlinearity of the highly linear optical fiber in the intensity modulation subsystem, and the scattered light is transmitted back and interferes with the optical carrier to form a microwave signal. Based on the vernier caliper effect, the oscillation mode consistent with the frequency of the microwave signal is locked into the main mode, and based on the mode competition mechanism, the side mode originating from the white noise of the system is suppressed for the first time; at the same time, in the cycle process, the main mode The oscillating signal is amplified through the gain region of Brillouin scattering, while the side-mode oscillating signal is suppressed again through the loss region and the intrinsic loss region. After double suppression, a single-frequency oscillating microwave signal with a high side-mode suppression ratio is generated.

Description

technical field [0001] The invention relates to the intersecting field of microwave technology and optical communication technology, in particular to a method for generating a single-frequency oscillating microwave signal and a single-frequency oscillating microwave signal source. Background technique [0002] The signal source is the heart of the electronic system, and the level of its index parameters is one of the core factors that determine the performance of the information system. The single-frequency oscillatory signal is a sinusoidal signal, which is the source of various other signals, and the ability to generate high-quality single-frequency oscillatory signals is a key research direction for current technological development. As the frequency of the oscillator increases, the phase noise of the single-frequency signal will also deteriorate, which is a typical "electronic bottleneck" in the current microwave communication field; the photoelectric oscillator applies ...

AI Technical Summary

Problems solved by technology

[0003] On the one hand, based on the basic principles of optoelectronic oscillators, in order to generate low phase noise oscillation signals, a large energy storage resonant cavity is necessary. Generally, very long communication optical fibers are used, but long optical fibers will cause multi-mode oscillation signals. Traditional methods usually use "Multi-loop interconnection" or "injection locking" is used to suppress the side mode. The system involves many components and modules, which is very complicated, the stability is not good, and the side mode suppression ratio is not ideal; on the other hand, the existing technology often uses The electro-optic intensity modulator is used to realize electro-optic intensity modulation, and the cavity filter is used to select and tune the oscillation signal, but the bias voltage of the electro-optical intensity modulator is difficult to control, and it and the cavity filter are temperature-sensitive components And the volume is huge, which makes it difficult to control the temperature drift of the oscillation signal, the system reliability is not good, and it is not conducive to light weight and integration

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