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We demonstrate a frequency multiplexed photon pair generation based on aquadratic nonlinear optical waveguide inside a cavity which confines onlysignal photons without confining idler photons and the pump light. Wemonolithically constructed the photon pair generator by a periodically-poledlithium niobate (PPLN) waveguide with a high reflective coating for the signalphotons around 1600 nm and with anti-refrective coatings for the idler photonsaround 1520 nm and the pump light at 780 nm at the end faces of the PPLNwaveguide. We observed a comb-like photon pair generation with a mode spacingof the free spectral range of the cavity. Unlike the conventional multipleresonant photon pair generation experiments, the photon pair generation wereincessant within a range of 80 nm without missing teeth due to a mismatch ofthe energy conservation and the cavity resonance condition of the photons,resulting in over 1000-mode frequency multiplexed photon pairs in this range.

Frequency-multiplexed photon pairs over 1000 modes from a quadratic nonlinear optical waveguide resonator with a singly-resonant configuration