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Lithium niobate photonic chip could realize diverse optical engineering forvarious applications benefiting from its excellent optical performances. Inthis letter, we demonstrate monolithic photonic chips for multi-channelsum-frequency conversion based on reverse-proton-exchange periodically poledlithium niobate waveguides, with the different channels showing uniform andexcellent conversion efficiencies. To obtain a robust device and provide aconvenient interface for applications, the integrated chip is fiber coupledwith two fiber arrays. The packaged chip then forms the core of a multi-channelup conversion single photon detector. In each channel the input signalinteracts with a 1950-nm single frequency pump laser and the sum frequencyoutput is spectrally filtered and detected by a silicon avalanche photodiode.Average detection efficiency (DE) of 23.2 % and noise count rate (NCR) of 557counts per second (cps) are achieved, with a standard deviation of 2.73 % and48 cps over the 30 channels, as well as optical isolation (OI) between nearbychannels of more than 71 dB, which are excellent for the extensive applicationsof monolithic photonic chips in fields including deep space lasercommunication, high-rate quantum key distribution and single-photon imaging.

Monolithic photonic chips for multi-channel frequency mixers and single photon detectors