Patent ID: 7340132
Filing Date: 2008-03-04
Classification: G02B

Abstract:
1. A polarization insensitive microbend-induced fiber grating formed within an optical fiber core region comprising a central core region of a selected refractive index difference (Δn a trench core region surrounding the central core region, the trench core region having a selected refractive index difference (Δn a ring area surrounding the trench core region, the ring cladding area having a selected refractive index difference greater than the trench core region refractive index difference and a predefined radial extent, the refractive indices and radii of each element configured to provide a relatively large gradient in refractive index as a function of distance from the fiber core center, sufficient to provide a resonant mode splitting between the propagating TE a device for maintaining pressure along a selected section of the optical fiber core region so as to induce periodic perturbations therealong.