Patent ID: 6834141
Filing Date: 2004-12-21
Classification: G02B

Abstract:
A filtering device comprising:first and second optical couplers each having two inputs and two outputs, the inputs of the first coupler being adapted to receive input optical signals to be filtered and the outputs of the second coupler being adapted to provide filtered output optical signals; a first optical waveguide optically coupling a first output of the first coupler to a first input of the second coupler; a second optical waveguide optically coupling a second output of the first coupler to a second input of the second coupler; an optical ring resonator, wherein the ring resonator has a circumferential optical path length greater than twice a difference in optical path length between the second optical waveguide and the first optical waveguide; and a third optical coupler optically coupling the optical resonator to the second optical waveguide.