Method of Measuring the Waveguide Dispersion Factor and the Thermo-Optic Coefficient of Effective Refractive Index of Long-Period Fiber Gratings是什么意思_Method of Measuring the Waveguide Dispersion Factor and the Thermo-Optic Coefficient of Effective Refractive Index of Long-Period Fiber Gratings在线翻译_英语_读音_用法_例句