Patent ID: 6243517
Filing Date: 2001-06-05
Classification: G02B,G02F

Abstract:
A grating coupled add-drop device comprising:a resonator having a round trip optical path characterized by a round trip optical length defining a free spectral range and a plurality of longitudinal resonator mode frequencies;an intracavity waveguide segment disposed along the optical path of said resonator, said intracavity waveguide having an effective refractive index that is substantially independent of a variation in temperature;a thermo-optic waveguide segment disposed adjacent said intracavity waveguide, said thermo-optic waveguide having a temperature dependent refractive index;a resistive heater electrode characterized by a temperature thermally coupled to said thermo-optic waveguide;a grating disposed in overlapping relation with a light beam propagating in said thermo-optic waveguide and inducing a grating coupling between said intracavity and thermo-optic waveguides, wherein a grating frequency of the grating coupling is tuned by the variation in temperature and at least a first resonator mode frequency is substantially independent of the variation in temperature, andan external waveguide segment disposed adjacent the optical path of said resonator and optically coupled to said resonator in a broadband parallel coupler arrangement.