Ultrahigh q value single-passband microwave photonic filter

Abstract

An ultrahigh Q-value single-passband microwave photon filter comprises a tunable filter, an optical coupler, a single-sideband modulation module, a single-sideband suppression carrier modulation module, a microwave signal source, an optical isolator, an optical amplifier, a single-mode optical fiber, an optical circulator, an optical fiber circulation cavity, a photoelectric detector and a vectornetwork analyzer, wherein the tunable filter is connected with the optical coupler, the optical coupler is connected with the single-sideband modulation module and the single-sideband suppression carrier modulation module, the optical isolator is connected with the single-sideband modulation module, the single-mode optical fiber is connected with the optical isolator, the microwave signal source is connected with the single-sideband suppression carrier modulation module, the single-sideband suppression carrier modulation module is connected with the optical fiber amplifier, the optical fiber amplifier is connected with the optical circulator, the optical fiber circulation cavity is connected with the optical circulator and is connected with the photoelectric detector, the photoelectric detector is connected with the vector network analyzer, and the vector network analyzer is connected with a microwave of the single-sideband modulation module.

Description

technical field [0001] The invention relates to a microwave photon filter, in particular to an ultra-high Q-value single-pass band microwave photon filter, which belongs to the fields of microwave photonics and electronic countermeasures. Background technique [0002] Microwave photonics is a discipline that uses the advantages of photonics such as high bandwidth, high speed, and low power consumption to realize the generation, transmission, processing, and control of microwave signals. Microwave Photonic Filter (Microwave Photonic Filter) is the core technology in the field of microwave photonics, which can realize selective filtering of microwave signals in the optical domain, and has a wide range of applications in broadband wireless communication, sensing, high-performance radar and astronomical detection. Compared with electronic microwave filters, microwave photonic filters have the advantages of high operating frequency band, tunable, low loss, strong anti-electromagn...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the main purpose of the present invention is to provide an ultra-high Q value single pass band microwave photon filter, to overcome the existing microwave photon filter can not achieve high Q value or ultra-narrow bandwidth Δf 3dB The problem of single-pass band filtering breaks through the limitation of the gain spectrum width of stimulated Brillouin scattering in optical fibers, and the 3dB bandwidth Δf of microwave photonic filters 3dB Compress to the kHz level, break through the problem that the FSR of the cascaded IIR filter is too small, and realize microwave photon single-pass band filtering. In addition, the invention also has the advantages of adjustable center frequency and high out-of-band rejection ratio

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