Optical switching between waveguides by adjacent resonant structure coupling

A system for optical switching, comprising:

• a first waveguide, positioned to enable an input light signal to couple from the first waveguide to a second waveguide through a first coupling gap and over a coupling length between the first waveguide and the second waveguide;
• and
• a first set of racetrack resonant structures, wherein each racetrack resonant structure of the first set is positioned along the coupling length to enable the input light signal to couple from one of the first waveguide and the second waveguide, such that a second set of coupling gaps corresponds to the first set of racetrack resonant structures;
• wherein each racetrack resonant structure of the first set is positioned adjacent to one of the first waveguide and the second waveguide over the coupling length, such that each coupling gap of the second set is positioned adjacent to the first coupling gap.

A method of optical switching, comprising:

• receiving an input light signal by a first waveguide of a directional coupler;
• coupling the input light signal in the first waveguide to a second waveguide of the direction coupler;
• coupling the input light signal in the directional coupler to a racetrack resonant structure that is positioned adjacent to the directional coupler, such that a passband portion of the input light signal that corresponds to a frequency passband of the racetrack resonant structure is output by the first waveguide and a remaining portion of the input light signal is output by the second waveguide;
• and
• changing the frequency passband of the racetrack resonant structure by varying a parameter of the racetrack resonant structure.