A device and method for generating a fine sweep frequency signal of a Brillouin spectrometer
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A technology of sweeping frequency signal and generating device, applied in the field of spectral detection, can solve problems such as affecting measurement accuracy, difficult to meet application requirements, precision spectral measurement errors, etc.
Active Publication Date: 2022-07-01
CHINA ELECTRONIS TECH INSTR CO LTD
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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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Embodiment 1
[0041] This embodiment provides a device for generating a fine frequency sweep signal of a Brillouin spectrometer.
[0042] A device for generating a fine frequency sweep signal of a Brillouin spectrometer, comprising a main control module, and a tunable laser module, a branching module, a first optical wave frequency shifting module, a second optical wave frequency shifting module, and coupling module;
[0043] Tunable laser modules for generating optical signals of specific wavelengths;
[0044] The splitting module is connected to the tunable laser module, and is used to equally divide the output light output by the tunable laser module into two paths of light;
[0045] The first optical wave frequency shifting module, connected to the branching module, is used to perform carrier suppression single sideband modulation on the first optical signal output by the branching module to generate the first finely tuned frequency-shifted light;
[0046] The second optical wave freq...
Embodiment 2
[0066] This embodiment provides a method for generating a fine frequency sweep signal of a Brillouin spectrometer.
[0067] A method for generating a fine frequency sweep signal of a Brillouin spectrometer, using the device for generating a fine frequency sweep signal of the Brillouin spectrometer described in the first embodiment, including:
[0068] Obtain an optical signal of a specific wavelength, and output the first optical signal entering the first optical wave frequency shift module and the second optical signal entering the second optical wave frequency shifting module through the branching module;
[0069] The first lightwave frequency shift module and the second lightwave frequency shift module generate two channels of finely tuned frequency shift light whose frequency difference is Brillouin frequency shift, power ratio is k, and wavelength tuning resolution is better than 1MHz, and then combined by the coupling module into A beam of pump signal light used for the ...
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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...
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