Patent ID: 6195482
Filing Date: 2001-02-27
Classification: G02B

Abstract:
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 and at least one output port; andP optical paths coupling the output port of the first optical coupling device to the input ports of the second optical coupling device;CHARACTERIZED IN THATthe waveguide grating router includes:a first mode converter optically coupled to at least one input port and the P output ports of the first optical coupling device, said first mode converter having at least two even modes that determine a first set of coupling coefficients between the input port and the P output ports of the first optical coupling device; anda second mode converter optically coupled to at least one output port of the second optical coupling device, said second mode converter having at least two even modes that determine a second set of coupling coefficients between said output port and the P input ports of the second optical coupling device;wherein the two sets of coefficients produced by the first mode converter and the second mode converter are essentially matched in magnitude such that a specified behaviour for the transmission coefficient in the vicinity of a center wavelength is produced with an acceptable mismatch loss.