Patent ID: 7292751

Claim:
An optical filter comprising: a first and second optical waveguide, an optical resonating structure optically coupled to said first waveguide to define a first energy coupling coefficient, and to said second waveguide to define a last energy coupling coefficient, the optical resonating structure including a plurality of N series-coupled resonators defining a plurality of N−1 resonator-to-resonator energy coupling coefficients μ 1 2 , μ 2 2 , . . . , μ N−1 2 , the plurality of resonators including at least three resonators, wherein the sequence of N−1 resonator-to-resonator energy coupling coefficients μ 1 2 , μ 2 2 , . . . , μ N−1 2 of the optical resonating structure is an asymmetric sequence of values.