Patent ID: 7418162
Filing Date: 2008-08-26
Classification: G02B

Abstract:
1. An apparatus for creating a grating on an optical waveguide, said apparatus comprising a first component for generating a first beam of electromagnetic radiation having a first cross-sectional shape and a second component for generating a second beam of electromagnetic radiation having a second cross-sectional shape different from the first cross-sectional shape, said apparatus being adapted for directing the first beam of electromagnetic radiation and the second beam of electromagnetic radiation toward the optical waveguide such that the first beam of electromagnetic radiation and the second beam of electromagnetic radiation interact and create the grating on the optical waveguide, wherein the first cross-sectional shape and the second cross-sectional shape are such that, when the first beam of electromagnetic radiation and the second beam of electromagnetic radiation are directed toward the optical waveguide, a first portion of the optical waveguide is exposed to either the first beam of electromagnetic radiation or the second beam of electromagnetic radiation and a second portion of the optical waveguide is exposed to both the first beam of electromagnetic radiation and the second beam of electromagnetic radiation, the grating being created on the second portion of the optical waveguide.