All-optical-fiber filtering device based on optical fiber F-P filter

Abstract

The invention discloses an all-optical-fiber filtering device based on an optical fiber F-P filter. The all-optical-fiber filtering device comprises an optical fiber coupling and shunting device and a two-stage-cascaded all-optical-fiber filtering device which are connected with each other. The all-optical-fiber filtering device is composed of an optical fiber coupler, an optical fiber band-pass filter and the optical fiber F-P filter, an optical fiber structure is adopted in the whole light splitting technology, atmosphere echo signals received by a telescope are coupled to an all-optical-fiber light splitting system through optical fibers, all-optical-fiber input and filtering output are achieved through connection between the optical fibers, the size and the weight of the light splitting system are greatly decreased, and the device has the structural advantages of being stable in system and high in reliability and anti-jamming property. Meanwhile, vibration raman scattering signals of water vapor molecules in an atmosphere and vibration raman scattering signals and mie-rayleigh scattering signals of nitrogen molecules in the atmosphere can be extracted from the spectral characteristics respectively, and the mie-rayleigh scattering signals and other stray light signals are highly inhibited in a raman channel.

Description

technical field [0001] The invention belongs to the technical field of laser radar atmospheric detection, and in particular relates to an all-fiber filter device based on an optical fiber F-P filter. Background technique [0002] Lidar is an active modern optical remote sensing device, which has the advantages of high spatial and temporal resolution and high detection sensitivity. It is widely used in (1) detection of atmospheric optical parameters phase visibility; (2) aerosol (3) Detection of atmospheric wind and turbulence; (4) Detection of concentration and distribution of atmospheric gas components; (5) Detection of atmospheric temperature and water vapor content. [0003] Raman lidar uses the Raman scattering effect between laser and atmospheric medium, and detects the density and other information of the medium by detecting the Raman scattered light of the medium. Vibrational Raman lidar uses the interdependence between backscattered echo signals and density of gas m...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an all-fiber filter device based on an optical fiber F-P filter, which solves the problems of large volume, poor reliability and complicated adjustment in the current technology.

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