The performance of AWG is also closely dependent on temperature sensitivity or thermal stability. The change of temperature will cause the change of the refractive index of the material, which is called the thermooptical effect of the material. The change index of the material refractive index to the temperature didn't is called the term optical coefficient of the material. The change of temperature will cause the spectral shift of AWG and increase the insertion loss and crosstalk. Therefore, it is of great significance and practical value to reduce the sensitivity of AWG to temperature and realize the athermal operation of the device.