Patent ID: 6456765
Filing Date: 2002-09-24
Classification: G02B,G02F

Abstract:
An apparatus, comprising: first and second waveguides, and a coupling portion operable to cause radiation at a first wavelength which is traveling in a direction of travel through said first waveguide and which reaches said coupling portion to be routed so as to be traveling in one of said first and second waveguides when exiting said coupling portion, and to cause radiation at a second wavelength different from said first wavelength which is traveling through said first waveguide in said direction of travel and which reaches said coupling portion to be routed so as to be traveling in the other of said first and second waveguides when exiting said coupling portion, said coupling portion including said first and second waveguides respectively having first and second portions that extend approximately parallel to each other and that are sufficiently close for a sufficient distance to permit coupling therebetween of radiation having at least one of said first and second wavelengths, and including structure operable along at least part of said distance to frustrate coupling between said first and second portions of radiation having one of said first and second wavelengths while permitting coupling between said first and second portions of radiation having the other of said first and second wavelengths.