Micro-ring laser bandwidth enhancement with micro-ring resonator

An optical multiplexer comprising:

• a first resonator structure comprising an optical amplification mechanism and a single mode filter that generates single-mode light in the first resonator structure, wherein the optical amplification mechanism generates a side mode different from a lasing mode generated at a cold cavity condition that propagates in the first resonator structure by modulating optical gain of the first resonator structure between the cold cavity condition and a second gain condition;
• a second resonator structure optically coupled to the first resonator structure, the second resonator structure comprising a phase-tuning mechanism that detunes the second resonator structure relative to a phase of the single-mode light generated in the first resonator structure to one-half a cold cavity linewidth of the lasing mode, wherein the detuning aligns a phase of light propagating in the second resonator structure with the side mode generated at the second gain condition to resonantly amplify the side mode, and wherein the light propagating in the second resonator structure is received via optical coupling between the first and second resonator structures;
• and
• a bus waveguide optically coupled to the first resonator structure, wherein a bandwidth enhanced light is output onto the bus waveguide via optically coupling to the first resonator structure, wherein the bandwidth enhanced light comprises the single-mode light from the first resonator structure and the amplified side mode.