Patent ID: 6568220
Filing Date: 2003-05-27
Classification: G02B

Abstract:
An optical fiber grating manufacturing method, comprising the steps of:forming an optical fiber preform, said optical fiber preform comprising: a core comprising silica; and a cladding surrounding said core, said cladding comprising silica, with a value of refractive index of said cladding being lower than a value of refractive index of said core; drawing an optical fiber from said optical fiber preform with a force in a state in which a viscosity of said cladding is higher than a viscosity of said core to provide said core and said cladding of the drawn optical fiber with residual stress such that refractive indexes of said core and said cladding of the drawn optical fiber are changed; and forming a grating in said drawn optical fiber by spatially periodically annealing regions of said drawn optical fiber to relieve residual stresses in said drawn optical fiber in said annealed regions.