Patent ID: 6321011
Filing Date: 2001-11-20
Classification: G02B,G02F

Abstract:
A grating coupled optical resonator 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 temperature independent;a thermo-optic waveguide segment disposed adjacent said intracavity waveguide, said thermo-optic waveguide having a temperature dependent refractive index;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;a resistive heater electrode characterized by a temperature disposed adjacent said thermo-optic waveguide and thermally coupled for heating said thermo-optic waveguide thereby providing a variation of temperature in said thermo-optic waveguide;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.