Brillouin scattering dynamic grating generation device and method based on capillary tube

Abstract

The invention discloses a Brillouin scattering dynamic grating generation device and a method based on a capillary tube. Laser is generated by a laser, two channels of beam signals are divided via a coupler from the laser, one beam generates back Brillouin scattering in a non-linear optical fiber, frequency shifting of a microwave signal source is performed via the other beam, the frequency difference of the two beams of optical path signals is the optical fiber Brillouin frequency shift, and Brillouin dynamic gratings are excited in the non-linear optical fiber; and the non-linear optical fiber is the capillary tube whose inner part is filled with refraction inner cores. According to the Brillouin scattering dynamic grating generation device and the method based on the capillary tube, the inner part of the capillary tube is filled with certain media to manufacture the non-linear optical fiber, the characteristic of the Brillouin dynamic gratings is adjusted via the control of the wavelength and power of a main laser and the frequency of the microwave signal source, dynamic gratings with the tunable grating characteristic are obtained, the electromagnetic interference is greatly reduced, and the device is advantaged by small size, high precision, low cost, and simple structure.

Description

technical field [0001] The invention relates to a grating generating device and method, in particular to a Brillouin scattering dynamic grating generating device and method. Background technique [0002] Spectral signal measurement is the most commonly used measurement method in the process of optical measurement and detection, and is widely used in the fields of optical communication, national defense, aerospace, environmental protection and materials. Fiber Bragg grating must be used to select signals in spectral signal measurement. Among the measured parameters, measurement resolution is the most important technical index of spectral measurement. Due to the limitations of parameters such as grating groove density and beam aperture, the resolution of the spectrometer based on the traditional grating is only a few pm; compared with the traditional grating spectrometer, the scanning Fabry-Perot interferometer can provide a higher spectrum Resolution, but its wavelength meas...

AI Technical Summary

Problems solved by technology

At present, they all use ordinary single-mode fiber or polarization-maintaining fiber to produce Brillouin dynamic gratings. The research and development of these Brillouin dynamic gratings are all focused on fixed-frequency pump light to generate fixed gratings. Therefore, the reflection wavelength is also Fixed, which limits the application in high-resolution spectroscopic analysis techniques

In recent years, driven by the development of laser technology, electronic technology and new photodetection elements, spectral resolution and dynamic range have been improved by several orders of magnitude. Therefore, Brillouin dynamic gratings produced by ordinary single-mode fibers or polarization maintaining Difficult to meet these new challenges

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