31 October 2016 A four-port vertical-coupling optical interface based on two-dimensional grating coupler
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Abstract
In this work, a fiber-to-chip optical interface with four output ports is proposed. External lights irradiate vertically from single mode fiber to the center of optical interface can be coupled into silicon photonic chips and split into four siliconon- insulator (SOI) waveguides. If the light is circular polarized, the power of light will be equally split into four ports. Meanwhile, all lights travel in the four channel will be converted into TE polarization. The optical interface is based on a two-dimensional grating coupler with carefully designed duty cycle and period. Simulation results show that the coupling efficiency of each port can reach 11.6% so that the total coupling efficiency of the interface is 46.4%. And Lights coupled into four waveguides are all converted into TE polarization. Further, the optical interface has a simple grating structure allowing for easy fabrication.
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Zan Zhang, Zanyun Zhang, Beiju Huang, Chuantong Cheng, Tianxi Gao, Xiaochuan Hu, Lin Zhang, Hongda Chen, "A four-port vertical-coupling optical interface based on two-dimensional grating coupler", Proc. SPIE 10019, Optoelectronic Devices and Integration VI, 100191E (31 October 2016); doi: 10.1117/12.2246478; https://doi.org/10.1117/12.2246478
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