Patent ID: 7903909
Filing Date: 2011-03-08
Classification: G02B

Abstract:
1. An optical structure comprising: a multimode waveguide supporting a first mode having a frequency and a first propagation constant associated therewith and a second mode having the frequency and a second propagation constant different from the first propagation constant associated therewith, the first and the second modes, when excited, creating a periodic light intensity pattern comprising low-intensity regions in a core of the multimode waveguide, a periodicity of the light intensity pattern being inversely proportional to a difference between the first and second propagation constants; a first plurality of attachments disposed at the core along a first side thereof, each attachment being placed at a location adjacent a low-intensity region of the periodic light intensity pattern such that a distance between any two of the locations approximately equals an integer multiple of the periodicity of the light intensity pattern, and each attachment comprising at least one of a transverse waveguide section or a doped semiconductor section; and a second plurality of attachments disposed at the opposite side of the core of the multimode waveguide.