耦合损耗
材料科学
光学
波导管
绝缘体上的硅
单模光纤
横模
硅
光电子学
多模光纤
光纤
物理
激光器
作者
Xian Zhang,Bin Chen,Ziliang Ruan,Weixi Liu,Pengxin Chen,Yaocheng Shi,Liu Liu
标识
DOI:10.1016/j.optcom.2020.125554
摘要
A high-efficiency and large-alignment-tolerance fiber interface to silicon-on-insulator wire waveguides is introduced. A spot-size converter is built through a full three-dimensional polymer waveguide and a silicon inverse taper is employed to expand the optical mode field from a silicon sub-micro waveguide to a normal cleaved single-mode fiber with a mode size of about 10μm. The fabrication for the three-dimensional structure relies on simple spin-coating processes. The coupling loss from the fiber to the silicon waveguide through the proposed structure reaches -1.0dB for both transverse electrical and transverse magnetic modes, respectively. The polarization-dependent loss for the best coupling case is kept within -0.6dB in the whole measured wavelength range. The coupling facet of the proposed fiber interface structure is polishable and facilitates an easy package procedure with standard fiber arrays.
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