System and method for frequency tunable microwave phase shifting

Abstract

The invention belongs to the field of microwave photonics, and discloses a system and method for frequency tunable microwave phase shifting. The method comprises the following steps that after a continuous light carrier is splitted, one beam of the continuous light carrier is processed by a MZ Mach-zehnder, and double-sideband optical signals restrained by the carrier are produced; the other beam of the continuous light carrier is processed by a phase modulator, and phase-shifted light carrier signals are produced; two beams of light signals are combined in a wave mode, one one-step sideband is removed through a tunable micro-ring filter in a filtering mode, a frequency-moved carrier signal and a phase-shifted carrier signal are obtained, photovoltaic conversion is carried out through a photoelectric detector, and a phase shift microwave electrical signal is produced; the resonant frequency of the tunable micro-ring filter is equal to any one-step sideband of the two one-step sidebands output by the MZ Mach-zehnder by changing the frequency of an input voltage drive signal and the resonant wavelength of the tunable micro-ring filter, and the frequency of the phase shift microwave signal is changed. The system and method for the frequency tunable microwave phase shifting is stable in output performance, fast in phase shift adjusting response, small in output microwave range fluctuation and continuously adjustable in wide frequency range.

Description

technical field [0001] The invention belongs to the field of microwave photonics, and more specifically relates to a frequency tunable microwave phase shift system and method based on a dual parallel modulator and a tunable microring filter structure. Background technique [0002] As a key device in microwave signal phase processing, microwave phase shifting system is mainly used in microwave photonics signal processing and optically controlled phased array radar system, and has important applications in satellite communication, mobile communication, military, aerospace and many other fields . The traditional microwave phase shifting system is mainly an electronic phase shifter, which is limited by the electronic bottleneck. The microwave signal generated has a small bandwidth, weak anti-interference ability, and a small phase shift range, which can no longer meet the urgent needs of high-performance radar. [0003] In recent years, there are three main realization principl...

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Problems solved by technology

Among them, the research on the microwave photon phase shift system based on optical true time delay technology appeared first, but its structure is generally composed of many delay units, and phase differences are generated between channels with different time delays, and phase-shifted microwaves are formed after the photodetector beats signal, but the adjustment of the system phase is relatively complicated

In the microwave photon phase shift system based on optical heterodyne mixing, random phase noise caused by environmental factors is easily introduced into the two interfering optical paths, resulting in instability of the microwave photon phase shift output

The microwave photonic phase shifter based on the vector sum mainly realizes the phase shift of the microwave signal after the vector synthesis by changing the amplitude of two microwave signals of the same frequency, but there are shortcomings such as a small controllable phase shift range and a large output microwave amplitude jitter.

[0004] Obviously, the existing traditional microwave phase shifting methods above all have deficiencies, and how to generate high-quality photonics with small amplitude fluctuation and continuously adjustable phase in a large frequency range in the application of more and more microwave photonics systems It will be a big challenge to output a stable microwave electrical signal

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