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

Abstract

The invention discloses a method for generating a single-frequency oscillation microwave signal and a single-frequency oscillation microwave signal source, and the method is based on the following technical conception: constructing an intensity modulation subsystem based on an electro-optical phase modulator through employing the stimulated Brillouin scattering principle to replace an electro-optical intensity modulator in a photoelectric oscillator, and achieving an electro-optical intensity modulation function through the intensity modulation subsystem; stimulated Brillouin scattering is generated through nonlinearity of a high-linearity optical fiber in the excitation intensity modulation subsystem; scattered light is subjected to reverse transmission and then subjected to beat frequency interference with an optical carrier to form a microwave signal, an oscillation mode consistent with the frequency of the microwave signal is locked to be a main mode based on the vernier caliper effect, and a side mode derived from system white noise is suppressed for the first time based on the mode competition mechanism; meanwhile, in the circulation process, a main mode oscillation signal isamplified through a Brillouin scattering gain area, a side mode oscillation signal is suppressed again through a loss area and an intrinsic loss area, and a single-frequency oscillation microwave signal with a high side mode suppression ratio is generated after dual suppression.

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 ...

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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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