A measuring device and measuring method for temperature coefficient of fiber grating

Abstract

The invention discloses a fiber grating temperature coefficient measuring device and a measuring method thereof. The device comprises a fiber laser, a multi-mode pumping+ signal beam combiner, a thermal infrared imager, a stripper and N semiconductor lasers. One of a low-reaction grating of a fiber laser is led out and is welded to one end of the stripper, and the other end of the stripper and theN semiconductor lasers are fused with a signal input end of the multimode pumping+ signal beam combiner. One end of a fiber grating to be measured is welded to a signal output end of the multi-mode pumping+ signal beam combiner, the other end is beveled, and the thermal infrared imager scans the fiber to be measured. Through three modes of only turning on the semiconductor lasers, only turning onthe fiber laser and turning on the fiber laser and the semiconductor lasers simultaneously, the temperature coefficient of the fiber grating to be measured is measured in real time, the heating reason of the fiber grating to be measured is analyzed and the fiber grating is processed accordingly.

Description

technical field [0001] The invention belongs to the field of optical fiber lasers, and in particular relates to a measuring device and a measuring method for the temperature coefficient of an optical fiber grating. Background technique [0002] In 1978, K.O. Hill of the Canadian Communications Research Center and his collaborators observed photon-induced gratings from optical fibers for the first time. Hill's early optical fiber used a sub-ion laser with a visible wavelength of 488nm to form a grating in the fiber core by increasing or prolonging the irradiation time of light injected into the fiber core. Later, G. Meltz and others used the interference fringes formed by a high-intensity ultraviolet light source to expose the optical fiber laterally and laterally to produce a refractive index modulation or phase grating in the optical fiber core. In 1989, the first fiber Bragg grating with a Bragg wavelength in the communication band was successfully developed. In 1993, Hi...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a measuring device and method for measuring the temperature coefficient of fiber gratings, which solves the problem that the temperature coefficient of the cladding pass laser and the temperature coefficient of the core pass laser cannot be tested separately in the traditional fiber grating temperature test method

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