Response shaping by multiple injection in a ring-type structure

An optical response shaper and/or a modulator device with multiple injection, the device comprising:

• a resonator having an enclosed geometric structure;
• at least two injection optical waveguides between an input port and a second end, the optical waveguides passing the resonator at respective approach points;
• coupling regions between said resonator and said injecting waveguides at said approach points respectively, the coupling regions providing optical coupling between said resonator and said injecting waveguides, parameters of the coupling regions or the waveguides defining at least two Free Spectral Range states;
• and
• an output port at a second end of one of said injection optical waveguides for providing frequency or time or phase or intensity responses according to said parameters of the injecting waveguides or of the coupling regions.