Tunable single-passband microwave photonic filter based on Brillouin optical carrier recovery

Abstract

The invention discloses a tunable single-passband microwave photonic filter based on Brillouin optical carrier recovery. The tunable single-passband microwave photonic filter comprises a tunable laser, an optical coupler, a first optical amplifier, a second optical amplifier, a first optical circulator, a second optical circulator, first-section single-mode optical fibers, second-section single-mode optical fibers, a first optical polarization controller, a second optical polarization controller, a Mach-Zehnder modulator, an optical fiber Fabry-Perot filer, an optical isolator, a high-speed photoelectric detector and an electric vector network analyzer, wherein the first-section single-mode optical fibers and the second-section single-mode optical fibers are each wound together in a compound mode. By means of the tunable single-passband microwave photonic filter based on the Brillouin optical carrier recovery, the microwave photonic filter with single-passband frequency responses can be achieved, the wavelength of outgoing light of the tunable laser can be changed, and the broadband of the filtering passband of the microwave photonic filter can be tunable.

Description

technical field [0001] The invention relates to the fields of optical fiber communication and microwave photon signal processing, in particular to a microwave photon filter based on stimulated Brillouin scattering. Background technique [0002] Compared with traditional electronic microwave filters, microwave photonic filters have the advantages of low loss, high bandwidth, anti-electromagnetic interference, flexible tunability and reconfigurability, and have attracted extensive research and application in the fields of radar, electronic warfare systems and wireless communications. . Traditional microwave photonic filters are based on discrete-time signal processing structures, and their frequency response has the problem of multiple harmonic passbands, but in many applications, single-passband microwave filters are required to obtain a wide frequency rejection range and avoid Spectrum overlap. [0003] Therefore, many methods and technologies are trying to expand the free...

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Problems solved by technology

[0006] The patent of the present invention is mainly aimed at solving the problem of the periodic filtering passband of the traditional discrete delay structure microwave photon filter, and also needs to solve the complex structure of the existing Brillouin carrier recovery microwave photon filter, and the Brillouin frequency shift in the process of operation and tuning Carrier Recovery Stability Issues Caused by Quantity Variations

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