Patent ID: 6768842
Filing Date: 2004-07-27
Classification: G02B

Abstract:
An arrayed waveguide grating (AWG) comprising:first and second slab waveguides and an array of waveguides optically coupled between the first slab waveguide and the second slab waveguide, the array waveguides having predetermined optical path length differences therebetween, and each said slab waveguide having a first side which is optically coupled to the array waveguides and which has a first radius of curvature, and an opposing second side which has a second radius of curvature which is substantially half the magnitude of the first radius of curvature; a plurality of output waveguides optically coupled to the second side of the second slab waveguide; wherein at the first side of the second slab waveguide the array waveguide angle &thgr;i of the ith array waveguide, with respect to a straight line passing through the centres of curvature of the first and second sides of the second slab waveguide, is defined substantially by the following equation: &thgr;i=ArcSine (i.&Dgr;&thgr;), where i=âˆ’(Nâˆ’1)/2, âˆ’(Nâˆ’1)/2+1, . . . , +(Nâˆ’1)/2 where i is the array waveguide number, N is the number of array waveguides, and &Dgr;&thgr; is a constant.