Temperature Characteristics of 1.5-µm-Band MgO Doped LiNbO3 Quasi-Phase Matched Wavelength Converters

Temperature characteristics of MgO doped LiNbO3 quasi-phase matched (QPM) wavelength converters are studied based on different frequency generation (DFG) for the first time. The temperature sensitivity of the QPM wavelength is found to be about 0.113 nm/°C for the device with a period of 18.7 µm, while the wavelength conversion efficiency at a pump power of -0.5 dBm is found to be -26 dB. These values are compatible with the best values for non-doped LiNbO3 QPM-DFG wavelength converters reported to date. It is shown that the converted wavelength can be tuned by changing device operation temperature and pump wavelength, indicating the capability of variable-in variable-out wavelength conversions required in optical cross connect networks.