INTEGRATED OPTICAL FILTERS UTILIZING RING RESONATORS

摘要

A filtering method and optical filter structure are presented. The structure comprises an input waveguide (W1), an output waveguide (W2), and a filter stage formed by at least one closed loop resonator (R1-R2) optically coupled to the input and output waveguides. 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 thus provides for reducing a bandwidth and insertion loss while filtering at least one optical channel from a multi-channel light signal.