Device and method for measuring brillouin gain spectrum in non-scanning manner based on pumping-detection method

Abstract

A device and a method for measuring a brillouin gain spectrum in a non-scanning manner based on a pumping-detection method relate to a device and a method for measuring the brillouin gain spectrum and aim to solve the problems of low signal-to-noise ratio, long measurement time and complex device of the conventional device and method in brillouin gain spectrum measurement. In the device for measuring the brillouin gain spectrum in the non-scanning manner based on the pumping-detection method, the laser output end of an optical fiber laser is communicated with the first port of an optical fiber circulator; the second port of the optical fiber circulator is communicated with the first port of a polarization controller, and the second port of the polarization controller is communicated with one end of an optical fiber to be measured; the laser output end of an ASE (Amplified Spontaneous Emission) light source is communicated with the light input end of an optical fiber isolator; the light output end of the optical fiber isolator is communicated with the other end of the optical fiber to be measured; and the third port of the optical fiber circulator serves as the light output end of the device for measuring the brillouin gain spectrum in the non-scanning manner based on the pumping-detection method; and besides, the connection is optical fiber connection. The device and the method provided by the invention are suitable for measuring the brillouin gain spectrum.

Description

Technical field [0001] The invention relates to a device and method for measuring Brillouin gain spectrum. Background technique [0002] The Brillouin gain spectrum contains important information such as Brillouin frequency shift, line width, and gain envelope, and is widely used in distributed optical fiber sensing, filtering and amplification of weak signals, and Brillouin lidar detection. At present, there are two main types of devices and methods for measuring the Brillouin gain spectrum: One is the single-ended method, that is, only the pump light is input into the nonlinear medium (such as optical fiber, water, etc.), and then the Brillouin The spectrum of the scattered Stokes light is called the Brillouin gain spectrum of the nonlinear medium; the second is the double-ended method, that is, the pump-detection method. "-" means that the method uses two paths of light, one is pump light, and the other To detect the light, a tunable laser or microwave generator is used to co...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of low signal-to-noise ratio, long measurement time and complex devices for measuring the Brillouin gain spectrum in the existing devices and methods, and provides a pump-detection method for non-scanning measurement of the Brillouin gain Apparatus and method for spectroscopy

Images