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Spectral analysis system and method based on stimulated Brillouin effect

A technology of stimulated Brillouin and spectral analysis, applied in the field of spectral analysis, can solve problems such as limited development and poor optical suppression, and achieve the effects of high signal-to-noise ratio, enhanced optical suppression ratio, and ultra-high spectral resolution capabilities

Active Publication Date: 2016-08-17
CHINA ELECTRONIS TECH INSTR CO LTD
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  • Summary
  • Abstract
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Problems solved by technology

[0005] There are currently several spectral analysis techniques based on the stimulated Brillouin effect. Their best spectral resolution capabilities are limited to tens of MHz due to the limitation of the spectral width of the stimulated Brillouin gain curve, and Due to the existence of background signals such as unamplified components of the signal to be measured, the optical suppression of the out-of-band spectrum is relatively poor, which limits the development of this technology

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  • Spectral analysis system and method based on stimulated Brillouin effect

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Embodiment 1

[0053] Such as figure 1 The resolution-enhanced ultra-hyperspectral analysis system based on the stimulated Brillouin effect shown includes narrow-band tunable laser 1, amplitude modulator 2, Brillouin spectrum sharpening component 3, polarization controller, and optical circulator 4. Single-mode optical fiber link 5. Optical isolator 7. Detection system 8. Control and data acquisition system 10.

[0054] 1. For narrow-band tunable lasers that generate pump signals, the following factors need to be considered:

[0055] (1) The output laser of the narrow-band tunable laser must have a high enough energy density to trigger the stimulated Brillouin scattering phenomenon in the selected medium, and can provide higher pump signal power to improve the stimulated Brillouin effect Amplify the power of the signal to improve the signal-to-noise ratio in spectral analysis applications;

[0056] (2) The output laser linewidth of the narrow-band tunable laser should be much smaller than the sti...

Embodiment 2

[0084] On the basis of the above-mentioned embodiments, the present invention proposes a spectral analysis method based on the stimulated Brillouin effect, which includes the following steps:

[0085] Step 1: Introduce an optical pump signal from a tunable laser light source at one end of the single-mode fiber link. Before entering the single-mode fiber link to perform the stimulated Brillouin interaction with the signal under test, perform the following on the pump signal Processing to optimize the performance of ultra-hyperspectral analysis:

[0086] ① Use an amplitude modulator to modulate the pump signal, and use a synchronous detection scheme with the detection system to improve the signal-to-noise ratio of the acquired spectrum signal, especially to optimize the detection ability of weak optical signals;

[0087] ②The modulated pump signal enters the Brillouin spectrum sharpening component. First, the beam splitter divides the pump signal into a stronger beam as the gain pump s...

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Abstract

The invention discloses a spectral analysis system and method based on the stimulated Brillouin effect and belongs to the technical field of spectral analysis. According to the method, special wavelength spectrum components of a to-be-detected signal are amplified on the basis of the stimulated Brillouin effect, the wavelength of a pump signal is changed in a push-broom mode, and spectral analysis of the to-be-detected signal is achieved; the spectrum resolution ratio is increased in the mode that a pair of attenuation spectra are superposed through stimulated Brillouin gain; by means of comprehensive utilization of polarization characteristics of interaction signals, a stimulated Brillouin gain amplification spectrum, a synchronous detection method, a method for improving the power of pump signals and the like, increase of the optical rejection ratio of the stimulated Brillouin gain amplification spectrum is achieved. The system and method can be used for ultrahigh-resolution spectrum testing of a new generation of optical network, optical devices and the like, and have the advantages that the spectrum resolution ratio is ultrahigh, the dynamic range is wide, precision is good, reliability is high and miniaturization is achieved.

Description

Technical field [0001] The invention belongs to the technical field of spectrum analysis, and specifically relates to a spectrum analysis system and method based on the stimulated Brillouin effect. Background technique [0002] Spectral analysis is a key diagnostic tool in optical applications such as communications, sensing, molecular spectroscopy, and microwave generation. For example, the use of optical methods to measure the ultra-high rate signal transmitted in the optical fiber communication system to obtain the approximate value of the modulation frequency is an effective means of diagnosis and monitoring of the transmission signal; laser spectrum contains most of the information on the radiation characteristics, so laser spectrum measurement is important for optical The design and implementation of the network play an important role. [0003] At present, the commonly used spectrometer based on grating diffraction has the advantages of wide spectral range and high scanning ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/44G01J3/02
CPCG01J3/02G01J3/0218G01J3/4412
Inventor 刘加庆李立功韩顺利张志辉袁明刘磊李志增牛继勇
Owner CHINA ELECTRONIS TECH INSTR CO LTD
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