Microphotonic Coupled-Resonator Devices

A method comprising:

• forming an optical resonator supporting a first resonance mode having a first resonant frequency, a second resonant mode having a second resonant frequency, and a third resonant mode having a third resonant frequency, the optical resonator having third-order optical nonlinearity;
• and
• optically coupling each of an optical waveguide input port and an optical waveguide output port to each of the three resonant modes, the optical input port being more strongly coupled to the first resonant mode than to the second and third resonant modes, the optical output port being more strongly coupled to at least one of the second and third resonant modes than to the first resonant mode.

A method comprising:

• optically coupling an input waveguide to a first optical resonator and second optical resonator;
• directly optically coupling an output waveguide to the first optical resonator, wherein the optical filter is configured to provide a passband having at least two poles and a transmission zero positioned outside a frequency range between the two poles.

An optical demultiplexer comprising:

• a first optical filter configured to provide a first passband having at least two first poles and a first zero positioned outside a first frequency range between the two first poles, the first zero being shifted from a center of the first passband by a channel spacing;
• and
• a second optical filter coupled in series with the first optical filter, the second optical filter being configured to provide a second passband having at least two second poles and a second zero positioned outside a second frequency range between the two second poles, wherein the first zero is located within the second passband.