khz level single passband microwave photon filter

Abstract

The invention provides a kHz-level single-passband microwave photonic filter comprising a laser, a first optical coupler, a single sideband suppression carrier modulation module, a single sideband modulation module, a microwave signal source, a first optical amplifier, a second optical amplifier, a second optical coupler, a single-frequency Brillouin fiber laser, a photodetector and a vector network analyzer. According to the invention, the ultra-narrow single-passband microwave photonic filtering is achieved by using a gain cavity of the single-frequency Brillouin fiber laser, the technical problem that an existing microwave photonic filter cannot achieve single-passband filtering below the order of magnitude of MHz is solved, the 3dB bandwidth of the device achieves a significant breakthrough and can reach the order of magnitude of kHz, and at the same time, the kHz-level single-passband microwave photonic filter has the advantages of stable center frequency is stable, tunability andhigh out-of-band rejection ratio.

Description

technical field [0001] The present disclosure relates to the field of microwave photon signal processing and electronic countermeasures, and in particular to a microwave photon filter with a kHz order single-pass band. Background technique [0002] Microwave photonics is the product of the fusion of microwave and photonic technologies, and has broad application prospects in the generation, transmission and processing of radio frequency signals. Microwave photonic filters use photonic technology to process microwave signals modulated on optical carriers in the optical domain, and finally realize the filtering function. It has advantages that traditional electric domain filters cannot match in terms of bandwidth, tuning, and reconstruction. It is a microwave The core technology in the field of photonics has attracted extensive research. [0003] The single-band-pass filtering technology with one passband overcomes the shortcoming of frequency response periodicity, and has bee...

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Problems solved by technology

[0005] Although there are many single-passband microwave photonic filter solutions, the key indicator 3dB bandwidth Δf 3dB Restricted, it is still on the order of MHz, and cannot achieve narrower (kHz or even Hz) single-passband microwave photon filtering, which cannot meet the needs of high-purity spectrum microwave signal generation, high-resolution microwave photon sensing, and high-performance microwave Applications such as photon radar

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