Suppression of Parasitic Nonlinear Processes in Spontaneous Four-Wave Mixing with Linearly Uncoupled Resonators

International audienceWe report an enhancement of over 10 4 in the signal-to-noise ratio characterizing the generation of identical photon pairs in a ring resonator system. Parasitic noise, associated with single pump spontaneous four-wave mixing, is essentially eliminated by employing a novel system design involving two resonators that are linearly uncoupled but nonlinearly coupled. This opens the way to a new class of integrated devices exploiting the unique properties of identical photon pairs in the same optical mode