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Optimal design for a flat-top AWG demultiplexer by using a fast calculation method based on a Gaussian beam approximation |
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| Authors: | Salman Naeem Khan Daoxin Dai Liu Liu Lech Wosinski |
| Affiliation: | a Centre for Optical and Electromagnetic Research, Zhejiang University, Zijingang, Hangzhou, 310058, China b Joint Research Center of Photonics of the Royal Institute of Technology (Sweden) and Zhejiang University (China), Zijinggang campus, East-5 Building, Zhejiang University, Hangzhou, 310058, China c Division of Electromagnetic Theory, Alfven Laboratory, Royal Institute of Technology, Teknikringen 31, S-100 44 Stockholm, Sweden d Laboratory of Photonics and Microwave Engineering, Department of Microelectronics and Information Technology, Royal Institute of Technology, S-16440 Kista, Sweden |
| Abstract: | Passband broadening of an AWG (array waveguide grating) demultiplexer with an MMI (multimode interference) coupler connected at the end of a tapered input waveguide is considered. An explicit formula based on the field propagation of an approximate Hermit-Gaussian beam is used to calculate quickly and reliably the spectral response of the AWG demultiplexer. The widths of the input waveguide, the output waveguides and the MMI coupler are optimized. The optimal design is verified with the experimental measurement. |
| Keywords: | 42.79.Gn 42.81.Qb 42.82.Et |
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