Patent ID: 6751380
Filing Date: 2004-06-15
Classification: G02B

Abstract:
A fiber grating comprising a core where a grating is written, a cladding for covering the core, and a coat layer for coating an outer face of the cladding,wherein the coat layer is made from a UV transmitting resin and has a characteristic of transmitting UV at least of a specific wavelength band used for writing the grating and of curing by absorbing UV of a shorter wavelength band or a longer wavelength band than the specific wavelength band, and the grating is written by irradiating the core with the UV of the specific wavelength band through the coat layer, wherein the core is co-doped with Ge and Sn, and a concentration of Ge is substantially the same as a concentration of Ge included in a core of another optical fiber to be connected to the fiber grating.