Patent ID: 6035083
Filing Date: 2000-03-07
Classification: G02B,H01S

Abstract:
A method for writing arbitrary refractive index perturbations along an optical waveguide, the method comprising the steps of:providing a waveguide having a photosensitive region;providing a writing beam of actinic radiation having a nominal diameter D, the writing beam defining an optical axis;translating the waveguide relative to the optical axis of the writing beam at a known velocity v(t);modulating the radiation intensity I(t) of the writing beam as a function of time t;delivering a fluence of radiation, .PHI.(x), directly to the waveguide, wherein ##EQU17## wherein the refractive index change .DELTA.n.sub.(x) at a position x along the waveguide length is related to the fluence delivered to that position as, .DELTA.n.sub.(x) =C.multidot..PHI..sub.(x), wherein C is a scaling factor that accounts for the photosensitivity of the waveguide.