Morimoto Yoshie, Ishigure Takaaki
Opt Express. 2016 Feb 22;24(4):3550-61. doi: 10.1364/OE.24.003550.
We experimentally investigate the optical loss of graded-index (GI) core polymer optical waveguides with a 45-degree mirror on their one end fabricated using the photo-addressing method. In addition, we also theoretically analyze the loss of GI square-core waveguides with mirrors using a ray-trace simulation tool. Then, in the waveguide based optical link including the optical path conversions via 45-degree mirrors, we show that GI waveguides realize lower total optical loss than conventional step-index (SI) core waveguides. The lower loss in the GI waveguide link is attributed to the tight optical confinement at the core center even after reflection at the mirrors.
我们通过实验研究了采用光寻址方法在一端制作有45度反射镜的渐变折射率（GI）芯聚合物光波导的光学损耗。此外，我们还使用光线追踪模拟工具从理论上分析了带有反射镜的GI方形芯波导的损耗。然后，在包括通过45度反射镜进行光路转换的基于波导的光链路中，我们表明GI波导实现的总光学损耗低于传统的阶跃折射率（SI）芯波导。GI波导链路中较低的损耗归因于即使在反射镜反射之后，光在芯中心处仍具有紧密的光限制。
