Fiber grating with pre-distortion structure and manufacturing equipment and technology of fiber grating

Abstract

The invention provides a fiber grating with a pre-distortion structure and manufacturing equipment and technology of the fiber grating. The fiber grating comprises a plurality of grating periods; and a long-period fiber grating with a positive helical deformation pre-distortion structure, a long-period fiber grating with a negative helical deformation pre-distortion structure or a long-period fiber grating with a positive and negative helical alternating deformation pre-distortion structure is formed. The equipment for manufacturing the fiber grating comprises a heating device, a three-dimensional mobile platform device and a rotating device, wherein the heating device is used for heating a processing area of a to-be-processed optical fiber into a molten state; the three-dimensional mobile platform device is used for horizontally moving the to-be-processed optical fiber; and the rotating device is used for twisting the to-be-processed optical fiber, so that pre-distortion force is introduced into the processing area to cause deformation, thereby forming the pre-distortion structure. The fiber grating with the pre-distortion structure is high in sensitivity, simple in manufacturing technology and low in structure complexity of the manufacturing equipment, so that the fiber grating is more suitable for practical application.

Description

technical field [0001] The invention relates to the technical field of fiber grating manufacturing, in particular to a fiber grating with a pre-twisted structure, fiber grating manufacturing equipment and technology. Background technique [0002] Fiber Bragg Grating has the characteristics of small size, low loss, high coupling, and good wavelength selectivity, so it has a wide range of applications in the field of optical fiber sensing. Existing fiber gratings are generally written by direct scanning of carbon dioxide laser radially on ordinary single-mode fibers, but the sensitivity of fiber gratings prepared by this method is not high; there is also a method of using carbon dioxide laser exposure while, The rotator drives the optical fiber to rotate, and the displacement platform moves horizontally to prepare a helical long-period fiber grating. Although the fiber grating with a continuous helical structure has high sensitivity, it has high requirements for the coaxiality...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a fiber grating with a pre-twisted structure, fiber grating manufacturing equipment and technology, aiming to solve the problem of complex fiber grating manufacturing technology made in the prior art

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