Measurements of thermal effects on four-photon mixing conversion efficiency in an optical fiber

Thermal effects on the conversion efficiency of four-photon mixing (FPM) power in a silica optical fiber are measured. When the temperature of the fiber changes from 9 to 350 °C, the first Stokes power decreases with a temperature coefficient of $-0.33\%{/}^{°}\mathrm{C}$ as the temperature increases to 200 °C and then becomes saturated with a further increase in temperature. This temperature characteristic of the first Stokes power reflects the temperature characteristics of the nonlinear refractive index of the fiber, which are similar to its FPM temperature dependence.