Method and device for obtaining flattop Brillouin gain spectra based on pumping modulation in liquid core optical fibers

Abstract

A method and a device for obtaining flattop Brillouin gain spectra based on pumping modulation in liquid core optical fibers solve the problem in the existing method and device that flattop gain spectra cannot be obtained when adopted dispersion displacement optical fibers or standard single mode optical fibers are over long and equal amplitude pumping wires are fewer and intrinsic Brillouin gain spectra cannot be changed. The method comprises modulating lasers output by a laser to obtain multiple spectral line pumping light, inputting the multiple spectral line pumping light in the liquid core optical fibers, and obtaining the flattop Brillouin gain spectra, namely spectra of backward Brillouin scattering light in the liquid core optical fibers. The device is composed of the laser, a polarization controller, a strength modulator, a signal generator, a direct current DC stabilized power supply, an optical fiber circulator, an optical fiber coupler and the liquid core optical fibers, and another device is composed of a signal generator, an optical fiber circulator, an optical fiber coupler, the liquid core optical fibers and a phase modulator. The method and the device are applicable to obtaining of the flattop Brillouin gain spectra.

Description

technical field [0001] The invention relates to a method and a device for obtaining a flat-top Brillouin gain spectrum, belonging to the field of optics. Background technique [0002] In recent years, the filter amplification technology based on stimulated Brillouin scattering has received widespread attention. It is used in high-sensitivity detection of weak optical signals in strong background fields, dense wavelength division multiplexing communication networks, optical fiber sensing, microwave photon signal processing, and optical amplifiers. There is great application potential in the system. However, some problems were also found in the research: First, the intrinsic Brillouin gain spectrum of commonly used nonlinear media is Lorentzian, which will inevitably cause non-uniform amplification of the signal, resulting in distortion; secondly, the Brillouin gain spectrum of Amplifiers can achieve narrow-band optical filtering, but too narrow a bandwidth limits their appli...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the dispersion-shifted optical fiber or standard single-mode optical fiber used in the existing method and device for obtaining the flat-top Brillouin gain spectrum is too long, and the constant-amplitude pumping line is less. As well as the problem that the intrinsic Brillouin gain spectrum cannot be changed, a method and device for obtaining a flat-top Brillouin gain spectrum based on pump modulation in a liquid core fiber are provided

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