Integrated optical filters utilizing resonators

A tunable optical filter structure comprising at least two waveguides and at least two closed loop resonator optically coupled to the waveguides and to each other, wherein a level of the coupling from each of the waveguides to the resonator is at least 5 times greater than a loss-per-revolution of the resonator.

An optical filter structure for filtering at least one optical channel from a multi-channel light signal, the filter structure comprising an input waveguide, an output waveguide, and a filter stage formed by at least one closed loop resonator optically coupled to the input and output waveguides, wherein a level of the coupling from each of the waveguides to the resonator is at least 5 times greater than a loss-per-revolution of the resonator, the filter structure thereby reducing a bandwidth and insertion loss of the filtering.

A method for reducing a bandwidth and insertion loss while filtering at least one optical channel from a multi-channel light signal, the method comprising inputting the light signal into an input waveguide of an optical filter structure that comprises at least one closed loop resonator optically coupled to said input waveguide and at least one output waveguide with a level of the coupling from each of the waveguides to the resonator being at least 5 times greater than a loss-per-revolution of the resonator.

A method for reducing a bandwidth and insertion loss while filtering at least one optical channel from a multi-channel light signal, the method comprising passing the light signal through an input waveguide of an optical filter structure, that comprises at least two closed loop resonators optically coupled to said input waveguide and at least one output waveguide and to each other, with a level of the coupling from each of the waveguides to the resonator being at least 5 times greater than a loss-per-revolution of the resonator.