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We report a detailed study of the noise properties of a visible-to-telecomphoton frequency converter based on difference frequency generation (DFG). Thedevice converts 580 nm photons to 1541 nm using a strong pump laser at 930 nm,in a periodically poled lithium niobate ridge waveguide. The converter reachesa maximum device efficiency of 46 % (internal efficiency of 67 %) at a pumppower of 250 mW. The noise produced by the pump laser is investigated in detailby recording the noise spectra both in the telecom and visible regimes, andmeasuring the power dependence of the noise rates. The noise spectrum in thetelecom is very broadband, as expected from previous work on similar DFGconverters. However, we also observe several narrow dips in the telecomspectrum, with corresponding peaks appearing in the 580 nm noise spectrum.These features are explained by sum frequency generation of the telecom noiseat wavelengths given by the phase matching condition of different spatial modesin the waveguide. The proposed noise model is in good agreement with all themeasured data, including the power-dependence of the noise rates, both in thevisible and telecom regime. These results are applicable to the class of DFGconverters where the pump laser wavelength is in between the input and targetwavelength.

Spectral noise in quantum frequency down-conversion from the visible to the telecommunication C-band