Patent ID: 6882778

Claim:
A waveguide grating router comprising a first optical coupling device having at least one input port and P output ports, a second optical coupling device having at least P input ports arid at least one output port; and P optical paths coupling the output ports of the first coupling device to the input ports of the second coupling device, wherein at least some of the optical paths have gaps formed by unguided free-distribution regions disposed between the coupling devices to produce predetermined optical energy losses in selected optical paths and consequently a predetermined Hyper-Gaussian (HG) amplitude distribution profile through the optical paths, the profile selected to result in a flat substantially zero chromatic dispersion profile of the router, and wherein a shape of the first optical coupling device, a shape of the second optical coupling device, a length of each of the a optical paths and a dimension of each of the gaps are determined by the Hyper-Gaussian amplitude distribution profile.