High-precision spectrum analyzer using stimulated Brillouin light loss mechanism

A stimulated Brillouin, high-precision technology, used in spectrometry/spectrophotometry/monochromator, instruments, scientific instruments, etc., to achieve ultra-high-precision spectral resolution, high precision and stability.

Inactive Publication Date: 2012-10-03
CHINA JILIANG UNIV
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Problems solved by technology

Chinese patent CN101246056A also mentions spectrum measurement using Brillouin scattering, but its technical field belongs to distributed

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  • High-precision spectrum analyzer using stimulated Brillouin light loss mechanism

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Embodiment Construction

[0023] Such as figure 1 As shown, the present invention is a high-precision spectral measurement and analysis device utilizing the mechanism of stimulated Brillouin optical loss in a full-wave optical fiber, including a scanning laser (1), an optical isolator (2), and a full-wave optical fiber of a certain length (3) , a polarization controller (4), an optical circulator (5), a photodetector (6), a data acquisition processing and control system (7) and a constant temperature device (8).

[0024] The data acquisition processing and control system (7) realizes continuous wavelength scanning output at a certain scanning speed within a set wavelength range by tuning the temperature and driving current value of the scanning laser (1), and the scanning laser (1) is scanning During the process, its output power is constant, and the output light enters the polarization controller (4) through the optical isolator (2), and after the polarization state is adjusted, it is input into a cer...

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Abstract

The invention discloses a high-precision spectrum analyzer using a stimulated Brillouin light loss mechanism in an all-wave fiber. By using the characteristic of wide inherent stimulated Brillouin scattering crest line of the all-wave fiber, based on the stimulated Brillouin light loss effect in the fiber, optical power loss is detected when output light of a scanning laser (TLS) generates stimulated Brillouin interaction in the all-wave fiber together with a to-be-detected signal (SUT) light for carrying out spectral measurement and analysis, and an ultra-high precision spectrogram of the SUT light is obtained. In a spectral analysis process, a constant-temperature device is used for eliminating frequency shift (about 11GHz) drift caused by temperature change of stimulated Brillouin scattering in the fiber, and further the precision and the reliability of the high-precision spectrum analyzer are improved; and meanwhile, a temperature and drive current tunable distributed feedback semiconductor laser is creatively used as a wavelength scanning laser light source, so that the high-precision spectrum analyzer has the characteristics of low cost, high reliability, flexibility and convenience.

Description

technical field [0001] The invention is a high-precision spectrum analyzer for detecting unknown spectra by measuring the power loss of stimulated Brillouin light in a full-wave optical fiber. The stimulated Brillouin effect between the output light of the above-mentioned scanning laser and the signal under test (SUT) light from the external device is measured by detecting the optical power lost in the interaction of the output light of the above-mentioned scanning laser with the above-mentioned signal light under test The spectrum of the signal light to be measured specifically includes a scanning laser (1), an optical isolator (2), a certain length of full-wave optical fiber (3), a polarization controller (4), an optical circulator (5), a photodetector (6 ), data acquisition processing and control system (7) and constant temperature device (8). Background technique [0002] US patent US7405820B2 describes a spectroscopic analysis device using stimulated Brillouin scatteri...

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Application Information

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IPC IPC(8): G01J3/44
Inventor 李裔张震伟叶兰芝张彩霞
Owner CHINA JILIANG UNIV
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