Research on phase compensation and diagnosis of silica-based planar waveguide circuits

我们开发了一种相位误差测量系统，该系统可以自动实现阵列波导光栅各通道的光耦合。我们创建了一个程序，通过使用系统测量的单个通道的相位误差分布来揭示输出端口平板波导透镜的折射率变化。通过扩大CO2激光的直径，我们能够将CO2激光照射引起的强度变化减小到0.3%。

We developed the phase error measurement system where the optical coupling at each channel of an arrayed-waveguide grating could be made automatically. We created a program for revealing the refractive index change over the slab waveguide lens at the output ports by using the phase error distributions of individual channels measured with the system. We were able to reduce the intensity change due to CO2 laser irradiation to 0.3% by expanding the diameter of the CO2 laser light.