Method for judging whether laser light is coupled into the core of a wheel-shaped fiber

Abstract

The invention relates to a method for judging coupling of laser into a wheel-shaped optical fiber core. A testing system consisting of a laser device, a lens and a spectrometer is adopted; when the light emitted by the laser device is collimated by the lens and enters a wheel-shaped microstructure optical fiber with a fluorescent indicator coated on the inner wall of an air hole, the transmitted light enters the spectrometer, and whether the laser is coupled into the fiber core of the wheel-shaped optical fiber is judged by judging the intensity of the Raman spectrum in the spectrometer; when the observation using the spectrometer shows that the light intensity of the optical fiber reaches the maximum because of the Raman background light emitted by the silicon material of the optical fiber, the coupling of the laser into the fiber core can be judged. The method can overcome the defect that whether the laser is coupled into the optical fiber core can not be judged by observing the brightness of the fiber core at a far end of the optical fiber due to absorption of a fluorescent coating layer to the laser when a fluorescent substance is detected by using the wheel-shaped microstructure optical fiber with the fluorescent indicator coated on the inner wall of the air hole. The method solves the problem that whether the laser is coupled into the optical fiber core can not be judged.

Description

technical field [0001] The invention relates to an optical fiber end-face coupling method, in particular to a method for judging whether the light emitted by a laser is coupled into the wheel-shaped optical fiber core when the end face is used for coupling a wheel-shaped microstructured optical fiber coated with a fluorescent indicator on the inner wall of an air hole. Background technique [0002] In recent decades, fiber optic technology has developed rapidly. Fiber optic fluorescence sensors are widely used in the field of sensing because of their low transmission loss and the ability to obtain more fluorescence signals. Compared with traditional silica fiber sensors, microstructured optical fibers have the advantages of unlimited single-mode characteristics, low loss characteristics, flexible dispersion characteristics, controllable nonlinearity, strong birefringence effect, and microstructure design and modification. . It has very broad application prospects in biochem...

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Problems solved by technology

[0004] The present invention aims at the problem that it is impossible to judge whether the laser light is coupled into the fiber core by observing the light and dark of the far-end fiber core of the wheel-shaped microstructure fiber when the wheel-shaped microstructure optical fiber coated with a fluorescent indicator on the inner wall of the air hole is used as the sensing head. To solve the technical problem, provide a method for judging whether the laser is coupled into the core of the wheel-shaped fiber. When the Raman background light intensity emitted by the fiber due to its own silicon material reaches the maximum with a spectrometer, it can be judged that the laser has been coupled into the fiber. core

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