Variable-coefficient microwave photonic filter based on wavelength interval tunable laser

Abstract

The invention discloses a variable-coefficient microwave photonic filter based on a wavelength interval tunable laser. The variable-coefficient microwave photonic filter based on the wavelength interval tunable laser is mainly composed of the wavelength interval tunable multi-wavelength laser and a Mach-Zehnder interferometer. According to the multi-wavelength laser, a Sagnac ring composed of pohotonic crystal fiber has a frequency selected filter effect, through changing the surrounding temperature of the pohotonic crystal fiber filled with glycerol and tuning the frequency selection characteristics of the Sagnac ring, the multi-wavelength laser outputs laser with different wavelength intervals so as to change the free spectrum range of the filter. Through regulating a variable optical delay line in the Mach-Zehnder interferometer and changing the arm length difference of the Mach-Zehnder interferometer, the transmission characteristics are changed, and carrier signals obtain different tap coefficients to obtain the variable-coefficient microwave photonic filter. The tunable and reconfigurable characteristics of the microwave photonic filter can be simultaneously realized through easily regulating the surrounding temperature of the pohotonic crystal fiber and the variable optical delay line.

Description

technical field [0001] The invention belongs to the technical field of microwave photon filters, in particular to a variable-coefficient microwave photon filter based on a wavelength interval tunable laser. The filter has tunable and reconfigurable characteristics. Background technique [0002] The microwave photonic filter can not only realize the function of the digital electronic microwave filter to pass the useful microwave signal smoothly and suppress the useless noise signal, but also can realize the direct processing of the radio frequency signal in the optical domain. Microwave photonic filters have the characteristics of high bandwidth, low loss, anti-electromagnetic interference, light weight and support for high sampling frequency in radio frequency systems, so they are widely used in various fields. At present, research work in various countries is mainly focused on designing new microwave photonic filter structures to achieve negative and complex tap coefficient...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that existing microwave photonic filters cannot realize tunable and reconfigurable characteristics at the same time

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