Patent ID: 6832026
Filing Date: 2004-12-14
Classification: G02B

Abstract:
A long-period fiber grating for use in an optical communication system, said grating comprising:an optical fiber having a core and a cladding, said core having refractive index perturbations spaced along a portion of its length whereby said fiber has a wavelength vs. transmission response with a transmission rejection band having a maximum transmission loss at a wavelength &lgr;B, at least one of said core and cladding including a first constituent having an index of refraction that decreases with an increase in temperature and a second constituent having an index of refraction that increases with the increase in temperature, a plot of the magnitude of the variation of &lgr;B with temperature of said grating having a minimum tempeature sensitivity at a temperature Tm, and wherein Tm is a temperature not in a first excluded temperature range from +15Â° C. to +25Â° C. and not in a second excluded temperature range from âˆ’5Â° C. to +5Â° C.