METHOD OF MANUFACTURING FIBER BRAGG GRATING AND APPARATUS FOR MANUFACTURING FIBER BRAGG GRATING

摘要

(Tasks) can be made smaller the variation in the refractive index modulation byeonpok, and also the method of FBG that can form a Bragg grating to give the desired change in the desired location hayeotgeona provided with a phase shift or the refractive index modulation amplitude of the optical fiber core in manufacturing and the manufacturing apparatus It provides. ; Length (solving means), the manufacturing method of the FBG is an optical fiber to an ultraviolet laser light 20 by the phase mask method the optical fiber cores (10a) to scan in the longitudinal direction (X axis direction) of the photosensitive optical fiber 10 (10) the step of forming the periodic refractive index modulation in the direction, in parallel with the scanning process of the ultra-violet laser light 20, and when the irradiation position of the ultraviolet laser light (20) when a predetermined position P _B, the phase mask 16, the optical fiber forming a predetermined distance by momentarily moves (e. g. the distance of 1/2 of the period of the Bragg grating), the optical fiber cores (10a) the phase shift unit 33, the periodic refractive index modulation formed in the longitudinal direction of 10 It has to process. ; Core optical fiber