Transmission of the waveguides at the signal wavelength was tested on the second and fifth waveguides and at the pump wavelength on the two central inputs. Transmission of the device corrected for Fresnel losses was found equal to 61% at 1550 nm and to 40% at 775 nm. From the numerical calculation of the mode overlap between waveguides and single-mode fibers (33), we estimated 0.14-dB/cm propagation losses at the signal wavelength and 0.55-dB/cm propagation losses at the pump wavelength. Propagation losses at the signal wavelength were not directly measurable from the central inputs, since 1550-nm beams were only weakly guided in the first tapered section of the periodically poled waveguides.

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