Apodized Waveguide Grating Couplers for Efficient Coupling to Optical Fibers
Apodized Waveguide Grating Couplers for Efficient Coupling to Optical Fibers
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DOI：
10.1109/lpt.2010.2051220
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发表时间：
2010-08-01
影响因子：
2.6
通讯作者：
Tsang, Hon K.
中科院分区：
文献类型：
--
作者：
Chen, Xia;Li, Chao;Tsang, Hon K.
我们描述了一种浅蚀刻衍射波导光栅耦合器，它实现了单模光纤和绝缘体上硅光波导之间的有效耦合。通过适当选择波导/光栅厚度，并通过调整其填充因子来改变光栅耦合器的耦合强度以优化模式匹配，每个光纤/硅波导界面的耦合损耗仅为 1.2 dB。还对具有不同填充因子的光栅的耦合强度和有效折射率进行了表征，以确认设计模拟。通过改变耦合强度来抑制背向反射，从而进一步提高耦合效率。
We describe a shallow-etched diffractive waveguide grating coupler which achieves efficient coupling between singlemode fiber and a silicon-on-insulator optical waveguide. By the appropriate choice of waveguide/grating thicknesses and varying the coupling strength of the grating coupler via tailoring its fill factor to optimize the mode matching, a coupling loss of only 1.2 dB was obtained for each fiber/silicon waveguide interface. The coupling strength and effective refractive index of grating with different fill factors were also characterized to confirm the design simulations. The back reflection was suppressed by varying the coupling strength, leading to further enhancement of the coupling efficiency.