Patent ID: 6678446
Filing Date: 2004-01-13
Classification: G02B

Abstract:
An optical apparatus comprising:a) a plurality of input waveguides; b) a first free propagation region optically coupled to the plurality of input waveguides; c) a second free propagation region; d) an arrayed waveguide grating optically coupling the first and second free propagation regions; e) first, second and third output waveguides optically coupled to the second free propagation region at angles &agr;aâˆ’1, &agr;a and, &agr;a+1 respectively such that the first output waveguide is adjacent to the second output waveguide and the second output waveguide is adjacent to the third output waveguide; wherein a value R given by: R=2Ã—&LeftBracketingBar;(Î±a-1-2&it;â€ƒ&it;Î±a+Î±a+1)(Î±a-1-Î±a+1)&RightBracketingBar;has a value of 0.1 or more.