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A hybrid modeling for the theoretical analysis of reflections in a multimode-interference coupler based on silicon-on-insulator nanowires |
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| Authors: | Ning Zhu Daoxin Dai Sailing He |
| Affiliation: | Centre for Optical and Electromagnetic Research, State Key Laboratory for Modern Optical Instrumentation, Zhejiang University, Hangzhou 310058, China Joint Research Center of Photonics of KTH (The Royal Institute of Technology, Sweden) and Zhejiang University, East Building No. 5, Zijingang Campus, Zhejiang University, Hangzhou 310058, China |
| Abstract: | A hybrid method combining the three-dimensional (3D) beam propagation method (BPM) and a 3D finite-difference time-domain (FDTD) method is presented for the simulation of multimode-interference (MMI) couplers based on silicon-on-insulator (SOI) nanowires. This hybrid method makes it possible to have a robust analysis for the reflection properties while avoiding a time-consumed computation with a simplex 3D-FDTD simulation. The reflected power is sensitive to both the length and the width of the MMI coupler and thus one should choose the optimal values for good self-imaging. Furthermore, the reflection could be reduced by introducing tapers between the MMI section and the access waveguides. |
| Keywords: | Multimode-interference coupler Finite-difference time-domain method Beam propagation method Reflection |
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