All-optical fiber light splitting system based on sampled fiber Bragg grating

Abstract

The invention provides an all-optical fiber light splitting system based on a sampled fiber Bragg grating. The all-optical fiber light splitting system comprises a lens, a first fiber Bragg grating, asecond fiber Bragg grating, a third fiber Bragg grating, a fourth fiber Bragg grating, a first superstructure fiber Bragg grating, a second superstructure fiber Bragg grating, a first coupler, a second coupler and a third coupler, wherein the first superstructure fiber Bragg grating, the second superstructure fiber Bragg grating, the first fiber Bragg grating, the second fiber Bragg grating, thethird fiber Bragg grating and the fourth fiber Bragg grating are in multi-stage cascade. According to the all-optical fiber light splitting system based on the sampled fiber Bragg grating provided bythe invention, when rotational Raman scattering high and low quantum numbers are obtained, the signal-to-noise ratio needs to be improved through twice reflection, the requirement for performance parameters of a visible light waveband fiber Bragg grating is greatly reduced, so that the processing of a feature signal by a subsequent system is facilitated, background noises can be well filtered out,and the problems of complex light splitting systems, large size and poor spectral light splitting stability are effectively solved.

Description

[0001] Technical field: [0002] The invention relates to the technical field of atmospheric remote sensing detection, in particular to an all-fiber optical splitting system based on sampling fiber gratings for miniaturized spaceborne remote sensing detection. [0003] Background technique: [0004] At present, the spectroscopic systems of Raman lidar are mostly double diffraction gratings, double interference filters, diffraction gratings, etc. These traditional spectroscopic systems often have disadvantages such as uncompact structure, complex optical path adjustment, and large system, which affect the scope of application, such as It limits its application in space-based or space-borne. [0005] Invention content: [0006] In view of this, it is necessary to provide an all-fiber spectroscopic system based on sampling fiber gratings. [0007] An all-fiber spectroscopic system based on sampling fiber Bragg gratings, including a lens, a first fiber Bragg grating, a second fib...

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Problems solved by technology

[0004] At present, the spectroscopic systems of Raman lidar are mostly double diffraction gratings, double interference filters, diffraction gratings, etc. These traditional spectroscopic systems often have disadvantages such as uncompact structure, complex optical path adjustment, and large system, which affect the scope of application, such as Limit its application in space-based or space-borne

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