All-fiber Fourier expansion spectrum analyzer

A spectrum analyzer, optical fiber Fu technology, applied in the field of spectrum analysis, can solve the problem of limited scanning range, etc., to achieve the effect of improving dynamic range, improving signal-to-noise ratio, and eliminating dark current

Active Publication Date: 2016-09-21
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

Patent application No. 201420347014.6 utility model patent relates to a window-scanned Fourier transform imaging spectrometer, and its scanning range is also very limited

Method used

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  • All-fiber Fourier expansion spectrum analyzer
  • All-fiber Fourier expansion spectrum analyzer
  • All-fiber Fourier expansion spectrum analyzer

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] The invention provides an all-fiber Fourier spectrum analyzer. It is characterized in that it consists of a light source to be tested 1, a connector 2, a three-port optical fiber circulator 3 and 4, a wavelength division multiplexer 5 and 6, a dual-port connected optical fiber coupler 7, and a differential optical path matching scanning device 8 , narrow-band semiconductor laser 9, differential photodetection signal amplifiers 10 and 11, adjustable attenuators 13 and 14, and signal processing units 14 and 15. The present invention adopts the all-fiber design, has the advantages of all-fiber devices, replaces the beam splitter with a fiber coupler, and uses a differential scanning mirror as an optical delay line, which not only simplifies the optical path, but also has the characteristics of large scanning range and high precision. The input end of the photoelec...

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Abstract

The present invention belongs to the field of the spectral analysis technology, and especially relates to an all-fiber Fourier expansion spectrum analyzer capable of accurate analysis and measurement of each light source spectrum. The analyzer comprises a light source to be measured 1, a connector 2, a first three-port fiber circulator 3, a second three-port fiber circulator 4, a first wavelength division multiplexer 5 and a second wavelength division multiplexer 6, a dual-port connected fiber coupler 7, a differential light path scanning device 8, a narrowband semiconductor laser 9, a first difference photoelectric detection signal amplifier 10 and a second difference photoelectric detection signal amplifier 11. The all-fiber Fourier expansion spectrum analyzer employs one input end of a difference photoelectric detection signal amplifier to use an adjustable attenuator so as to realize the balance adjusting of the optical path, eliminate the influence on the direct current intensity signal and the detector dark current, improve the dynamic scope of the system measurement, enhance the intensity of the interference signals and further improve the signal to noise ratio of the system.

Description

technical field [0001] The invention belongs to the technical field of spectrum analysis, and in particular relates to an all-fiber Fourier spectrum analyzer which can be used for accurate analysis and measurement of various light source spectra. Background technique [0002] With the advancement of modern technology and the development of industry technology, analytical instruments and test systems have been rapidly developed and applied. The spectrum analyzer is an important member of the optical instrument family, and has broad application prospects and practical value in the field of analysis and testing. [0003] Fourier transform spectrometer has many advantages such as high throughput, high resolution, and high wavenumber accuracy. It is a powerful tool for spectral analysis and can be used for the measurement of wide spectrum, complex spectrum or extremely weak spectrum. Fourier transform spectroscopy is widely used in molecular spectroscopy and infrared spectroscop...

Claims

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Application Information

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IPC IPC(8): G01J3/45G01J3/02
CPCG01J3/0213G01J3/0218G01J3/0297G01J3/45
Inventor 苑立波何学兰苑勇贵杨军
Owner GUILIN UNIV OF ELECTRONIC TECH
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