High-efficiency apodized bidirectional grating coupler for perfectly vertical coupling
High-efficiency apodized bidirectional grating coupler for perfectly vertical coupling
复制标题
高效变迹双向光栅耦合器，实现完美垂直耦合
DOI：
10.1364/ol.44.005081
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发表时间：
2019-10-15
期刊：
影响因子：
3.6
通讯作者：
Reed, Graham T.
中科院分区：
文献类型：
--
作者：
Zhang, Zanyun;Chen, Xia;Reed, Graham T.
我们提出并实验证明了一种高效、完美垂直耦合的双向光栅耦合器。通过光栅化，可以显著提高耦合效率，减小寄生反射。为了便于制作，引入了亚波长光栅，这也有利于提高耦合性能。模拟显示，选举结果达到创纪录的72%。结果表明，该耦合器对入射模场直径和光纤失向的变化具有较强的鲁棒性。在37 nm的1 dB带宽下，实验测量了-1.8 dB的CE。(C) 2019美国光学学会
We propose and experimentally demonstrate an apodized bidirectional grating coupler for high-efficiency, perfectly vertical coupling. Through grating apodization, the coupling efficiency (CE) can be notably improved, and the parasitic reflections can be minimized. For ease of fabrication, subwavelength gratings are introduced, which are also beneficial for the coupling performance. Simulation shows a record CE of 72%. We found that the coupler is quite robust to the variation of incidence mode field diameter and fiber misalignment. A CE of -1.8 dB is experimentally measured with a 1-dB bandwidth of 37 nm. (C) 2019 Optical Society of America