Patent ID: 7016568
Filing Date: 2006-03-21
Classification: G02B

Abstract:
1. An arrayed waveguide grating (AWG) device comprising: a substrate having first and second slab couplers; a first array of waveguides optically coupled between the first and second slab couplers and having respective predetermined optical path length differences therebetween; a second array of waveguides optically coupled at first ends thereof to an input/output side of the second slab coupler, the waveguides of the second array being substantially tapered at first end portions thereof so as to increase in width towards the second slab coupler; wherein the pitch between adjacent waveguides of the second array varies across the second array and the width of said first ends of the waveguides varies across the second array so as to keep the distances between adjacent edges of adjacent waveguides at the first end in the direction perpendicular to the waveguide axis substantially constant across the second array of waveguides.