Presentation Information
[B-10A_B-13-11]Investigation of oblique coupling using a multilayer structure of a fiber core and a silicon waveguide
〇Daichi Nishi1, Takui Uematsu1, Hidenobu Hirota1, Nobutomo Hanzawa1 (1. NTT, Inc.)
Keywords:
Multi-Core Fiber,Silicon Waveguide
As network switches become increasingly highly integrated, the large number of fiber connections poses a challenge, creating a need for low-loss connection structures compatible with MCF. In this study, we proposed a structure in which MCF is coupled obliquely to a Si waveguide, using a multilayer (2-layer and 3-layer) waveguide configuration to reduce spot size mismatch. Simulation results confirmed that the three-layer structure allows for stepwise spot size conversion, thereby reducing coupling loss to approximately 1.0 dB over a wide bandwidth. On the other hand, in oblique coupling, the electric field distribution of TM waves is significantly distorted, leading to a decrease in the coupling coefficient and an increase in the loss difference compared to TE waves. In particular, it was shown that this difference becomes more pronounced as the electric field distribution widens due to the introduction of SiOx waveguides.
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