A device and method for generating a fine sweep frequency signal of a Brillouin spectrometer

Abstract

The invention provides a device and method for generating a fine sweep frequency signal of a Brillouin spectrometer. The device includes a main control module, a tunable laser module, which is used to generate an optical signal of a specific wavelength; a branching module, which is connected to the tunable laser module, and is used to divide the output light output by the tunable laser module into two paths of light equally; an optical wave frequency shifting module, connected to the branching module, for performing carrier suppression single sideband modulation on the first optical signal output by the branching module to generate a first finely tuned frequency-shifted light; a second optical wave frequency shifting module, connected to the branching module The channel module is used to perform carrier suppression single-sideband modulation on the second channel optical signal output by the split module to generate the second fine-tuned frequency-shift light; the coupling module is used to connect the first optical wave frequency shifting module and the second optical wave frequency shifting module. , which is used to combine the first finely tuned frequency-shifted light and the second finely tuned frequency-shifted light into a beam of finely swept frequency-shifted signal light, which is used as the pump signal light when the Brillouin spectrometer works.

Description

technical field [0001] The invention belongs to the field of spectral detection, in particular to a device and method for generating a fine sweep frequency signal of a Brillouin spectrometer. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Spectral analysis is a key diagnostic tool in optical applications such as communications, sensing, molecular spectrometers, microwave generation, etc. For example, using optical methods to measure spectral parameters of ultra-high-rate signals transmitted in fiber-optic communication systems, the signal quality of the transmitted signal can be obtained. , OSNR, bit error rate and other information, is an effective means of diagnosing and monitoring transmission signals. [0004] At present, the commonly used spectral analyzer based on grating diffraction has the advantages of wide spectral range and hi...

AI Technical Summary

Problems solved by technology

Existing schemes that directly use commercial tunable lasers as pumping sources have been difficult to meet application requirements

In addition, due to the working principle adopted by the Brillouin spectrometer, it can be known that when the frequency difference between the signal spectrum to be measured and the pump signal light is negative, a gain spectrum is generated; when the frequency difference between the signal spectrum to be measured and the pump signal light is positive , resulting in a loss spectrum, which will introduce defects such as spectral ghost lines in the measurement spectrum, resulting in precise spectrum measurement errors and affecting measurement accuracy

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