Micro and nano optical fiber filter, optical fiber laser, optical fiber sensing device and manufacturing method

Abstract

The invention discloses a micro and nano optical fiber filter, an optical fiber laser, an optical fiber sensing device and a manufacturing method. The micro or nano optical fiber filter is an ''8''-shaped micro and nano optical fiber and the diameter of the micro and nano optical fiber is within 0.1-10 microns. The diameter of the surrounded ''8''-shaped circle is within 1-10mm. The optical fiber laser consists of a pump laser, a wavelength division multiplexer, doped optical fiber, the ''8''-shaped micro or nano optical fiber filter and an optical fiber Bragg grating. The optical fiber sensing device comprises an optical fiber laser and a container filled with medium to be tested. Besides small volume, narrow line width and no electromagnetic interference, the laser provided by the invention further has the advantages of simple structure and tuning capacity and the like. In addition, as the laser is combined with the micro or nano optical fiber which has strong evanescent wave characteristic, the laser can sense change of external environment parameters such as temperature, refractive index and the like more sensitively, so that the laser provided by the invention has wide application prospect.

Description

technical field [0001] The invention relates to the technical field of fiber laser and fiber sensing, in particular to a tunable dual-wavelength fiber laser based on micro-nano fiber. Background technique [0002] In the field of optical fiber sensing, the method of using lasers to generate laser light for sensing is more and more widely used because the laser output has the advantages of high power and narrow line width. However, the application of ordinary fiber lasers in the field of fiber optic sensing still has certain limitations. The reason is that ordinary fiber lasers are not sensitive to changes in the external environment. [0003] Micro-nano optical fibers refer to optical fibers with diameters on the order of microns or nanometers. Due to their strong evanescent field characteristics, compared with ordinary optical fibers, micro-nano optical fibers are more capable of sensing changes in the external environment, such as temperature and refractive index. It is p...

AI Technical Summary

Problems solved by technology

The device adopts the method of directly drawing the active fiber into a micro-nano fiber. Although the laser output can be realized, it is difficult to achieve higher power output because the gain per unit length decreases after the active fiber is drawn into a micron fiber. Not conducive to long-distance communication and sensing applications

At the same time, since the input and output of the laser are both tapered fiber coupling, the realization process is difficult, which limits the application environment of the laser

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