Patent ID: 6819834
Filing Date: 2004-11-16
Classification: G02B

Abstract:
A manufacturing method for an optical fiber grating comprising the steps of:loading hydrogen in a material optical fiber for forming the optical fiber grating in order to increase the photosensitivity of the optical fiber when necessary; forming a grating part having a periodic refractive index distribution by irradiating an optical fiber along the longitudinal direction with ultraviolet light at a predetermined period and carrying out dehydrogenation when necessary; carrying out at least once uniform ultraviolet irradiation processing that irradiates the grating part as a whole at a predetermined temperature and time; carrying out at least once heat trimming processing that uniformly heats the grating part as a whole at a predetermined temperature and time; and carrying out heat annealing processing that heats the grating part to a uniform temperature for a predetermined period in order to stabilize the optical properties of the grating part; wherein the uniform ultraviolet irradiation processing and the heat trimming processing are carried out alternately as optical property adjusting processing.