Patent ID: 7558450

Claim:
An optical device for producing a time delay T d of an input optical signal, comprising: an optical waveguide receiving the input optical signal; the input optical signal being a single side band signal having a signal band with a median angular frequency ω r and an optical carrier angular frequency ω 0 ; at least a first loop waveguide resonator coupled to the waveguide, at least a second loop waveguide resonator being coupled to the waveguide; at least a third loop waveguide resonator coupled to the waveguide, the input signal being coupled in and out of the first, second, and third loop resonators; wherein the first, second and third resonators having different resonant angular frequencies ω 1 , ω 2 and ω 3 ; the last of all resonators outputting an output signal; the output signal being transmitted by the waveguide; the output signal providing an equal group delay to all frequency components in the input signal.