Patent ID: 7715676
Filing Date: 2010-05-11
Classification: G02B

Abstract:
1. An apparatus, comprising: an optical waveguide comprising a first optical medium having a first refractive index, the optical waveguide having a first surface and a second surface on opposing sides of the waveguide; an optical grating disposed on a portion of the first surface, the optical grating comprising a second optical medium having a second refractive index larger than the first refractive index, the optical grating further having a discontinuity in a structure of the grating; a grating-side cladding comprising a third optical medium having a third refractive index smaller than the first and second refractive indexes, wherein the third optical medium is disposed in intimate contact with both the first optical medium and the second optical medium, the third optical medium contacting the first surface at the discontinuity in the grating structure; and an absorbing layer comprising a fourth optical medium, the absorbing layer in intimate contact with the second surface along a first length of the optical waveguide opposite the optical grating.