Patent ID: 7859744

Claim:
A photon source system, comprising: a periodically polled lithium niobate (PPLN) waveguide having first and second ends and adapted to perform spontaneous parametric downconversion (SPDC) of pump light having a first wavelength; first and second end waveguides having lithium-niobate-embedded Bragg gratings, the first and second end waveguides being respectively arranged at the first and second ends of the PPLN waveguide so as to form a Fabry-Perot cavity having a cavity resonant wavelength, wherein the first and second end waveguides each include electrodes adapted to provide an adjustable applied electric field so as to adjust said cavity resonant wavelength; and a pump light source optically coupled to the first end waveguide and adapted to provide said first-wavelength pump light therethrough to the PPLN waveguide so that the PPLN waveguide can convert the pump light via SPDC to generate output photons having a second wavelength that is twice the first wavelength and having an output spectrum that corresponds to the applied electric field in the first and second end waveguides.