Fabriction method of fiber bragg gratings for improvement of spectral characteristics

摘要

1. TECHNICAL FIELD OF THE INVENTION;The present invention relates to a method of manufacturing an optical fiber grating for improving the spectral characteristics.;2. The problem to be solved by the invention;The present invention is an optical fiber grating which can move only the position of the laser beam used for fabrication of the optical fiber grating without any deformation, thereby realizing the depolarization of the optical fiber grating and remarkably improving the spectral characteristics. To provide a process for the preparation of;3. Summary of Solution to Invention;The present invention provides a method of manufacturing an optical fiber grating for improving spectral characteristics, comprising: a first step of moving a position of a laser beam from a position where an optical fiber grating is to be manufactured; Fix the center of the laser beam to the left end of the optical fiber grating and irradiate the laser beam without a phase mask at this position, then move the position of the laser beam back to the opposite side where the optical fiber grating will be manufactured A second step of irradiating the laser beam again; After fixing the center of the laser beam to the central portion of the optical fiber in which the concave refractive index distribution is formed by laser irradiation, the phase mask is applied to the side of the optical fiber in the direction in which the light is directed so that the laser beam passes through the phase mask to irradiate the optical fiber. Contacting the third step; And a fourth step of again irradiating a laser beam through the phase mask to the center of the concave refractive index optical fiber.;4. Important uses of the invention;The present invention is used in a method of manufacturing an optical fiber grating.