Ultrahigh spectral resolution enhancing method based on deconvolution

Abstract

The invention discloses an ultrahigh spectral resolution enhancing method based on deconvolution, and particularly relates to the technical field of spectral analysis. According to the method, a stimulated Brillouin gain spectrum mathematical model generated by a single-mode polarization maintaining optical fiber in a spectral analysis system based on a stimulated Brillouin effect is built firstly; then at each spectral sampling point of the spectral analysis system, based on the stimulated Brillouin gain spectrum mathematical model, the deconvolution is carried out on a measured ultrahigh spectrum; and finally, spectral defects possibly existing in the ultrahigh spectrum obtained by the deconvolution are eliminated by adopting a Pade approximation spectral fitting method, so that the enhancement of the ultrahigh spectral resolution is achieved. By adopting the spectral resolution enhancing method, the spectral resolution capability of the spectral analysis system based on the stimulated Brillouin effect is greatly improved, the spectral resolution limitation of the stimulated Brillouin gain spectrum width to the spectral analysis system is broken through, and the spectral resolution is increased to be less than 1 MHz from a limited range of tens of MHz.

Description

technical field [0001] The invention relates to the technical field of spectral analysis, in particular to a deconvolution ultra-high spectral resolution enhancement method. Background technique [0002] 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 the spectrum of ultra-high-speed signals transmitted in optical fiber communication systems to obtain approximate modulation frequencies is an effective means of diagnosing and monitoring transmission signals; laser spectrum contains most of the information on radiation characteristics, so laser spectrum measurement is important for optical Network design and implementation play an important role. [0003] At present, the spectrum analyzer based on grating diffraction is commonly used, which has the advantages of wide spectral range and high scanning speed, etc., but its best ins...

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Problems solved by technology

Spectral analysis technology based on the stimulated Brillouin effect, its instrument line shape function is the stimulated Brillouin gain spectrum, their best spectral resolution capability is limited by the spectrum width of the stimulated Brillouin gain, the best The level can only reach tens of MHz, although there are several spectral analysis techniques based on the stimulated Brillouin effect, such as the Chinese patent with the patent number ZL201610323536. The method realizes the enhancement of spectral resolution, but it brings problems such a

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