Abstract
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.
Highlights
IntroductionThe arithmetic capacity of high performance computers (HPCs) has grown explosively [1]
Over the last decades, the arithmetic capacity of high performance computers (HPCs) has grown explosively [1]
Multimode fiber (MMF) links have already been deployed as board-to-board interconnects in some current HPCs and datacenter networks, and the issue is how to realize on-board optical interconnects [2]
Summary
The arithmetic capacity of high performance computers (HPCs) has grown explosively [1]. We already presented one of the promising fabrication methods for GI-core polymer optical waveguides named “Photoaddressing method,” which was developed at Sumitomo Bakelite Co., Ltd. and demonstrated the low propagation loss and low coupling loss with an MMF even for square-shaped GIcores [11]. These results were obtained when the waveguide core was perfectly aligned with light sources or photodiodes. In this paper, we fabricate polymer optical waveguides which have 45-degree mirrors on one end, and investigate the optical properties of GI-core waveguides with a 45degree mirror
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