Broadband tunable single-passband microwave photon filter generating system

Abstract

The invention discloses a broadband tunable single-passband microwave photon filter generating system. The system comprises a laser, an optical coupler, a polarization modulator, a dispersion displacement optical fiber, a photoelectric detector, a vector network analyzer, a strength modulator and an optical fiber; the laser is used for providing continuous light signals; the optical coupler is used for dividing the continuous light signals into the first path of light signals and the second path of light signals; the polarization modulator is used for modulating the polarization state of the first path of light signals; the dispersion displacement light fiber is used for performing stimulated Brillouin scattering on the detection light signals under the induction effect of pump light signals; the photoelectric detector is used for receiving the detection light signals which are processed in a stimulated Brillouin scattering mode and output by the dispersion displacement optical fiber and generating microwave signals; the vector network analyzer is used for receiving microwave signals output by the photoelectric detector, performing measurement frequency response on the microwave signals, and outputting the microwave signals to the a first polarization modulator at the same time; the strength modulator is used for modulating the polarization state of the first path of light signals and outputting the first path of light signals which are modulated; the optical fiber is used for filtering the first path of light signals which are modulated, and the first path of light signals serve as the pump light signals.

Description

technical field [0001] The invention belongs to the field of microwave photonics, and more specifically relates to a broadband tunable single-passband microwave photon filter based on the stimulated Brillouin scattering effect of optical fiber. Background technique [0002] Microwave photonics is an interdisciplinary subject that combines microwave technology and photonic technology proposed in the 1970s, which takes into account the flexibility of microwave technology and the broadband and low loss characteristics of photonic technology. Microwave filters are widely used in broadband wireless access networks, radar systems, electronic countermeasures, and satellite communications. However, the reconfigurability and tunability of traditional microwave filters based on electronic technology are extremely poor. Once the circuit design is completed, only It can complete the filtering of specific frequency microwaves. Microwave photonic filters overcome the shortcomings of trad...

AI Technical Summary

Problems solved by technology

The present invention solves the difficult problems of low out-of-band suppression ratio, inability to tune broadband, low Q value, and poor reconfigurability of microwave filters in radar systems, electronic countermeasure systems, broadband wireless access network systems, and satellite communication systems

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