Efficient silicon nitride grating coupler with distributed Bragg reflectors.

@article{Zhang2014EfficientSN,
  title={Efficient silicon nitride grating coupler with distributed Bragg reflectors.},
  author={Huijuan Zhang and C. C. Li and Xiaoguang Tu and Junfeng Song and Haifeng Zhou and Xianshu Luo and Ying Huang and Mingbin Yu and Guoqiang Lo},
  journal={Optics express},
  year={2014},
  volume={22 18},
  pages={
          21800-5
        }
}
In this paper we have designed, fabricated and characterized a high efficiency Silicon nitride grating coupler at 1490 nm. Distributed Bragg reflectors as bottom mirrors are employed to improve the coupling efficiency by reflecting the downward traveling light. The peak coupling efficiency obtained is about -2.5 dB and the 1-dB bandwidth is 53 nm. The fabrication process is CMOS-compatible and is ready to be integrated with photonic circuits. 

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