Vertically bent silicon waveguide for high-efficiency optical fiber coupling
Vertically bent silicon waveguide for high-efficiency optical fiber coupling
复制标题
用于高效光纤耦合的垂直弯曲硅波导
DOI:
10.1117/12.2314742
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Tomoya Yoshida
中科院分区:
文献类型:
--
作者:
Y. Sakakibara;Y. Atsumi;E. Omoda;Tomoya Yoshida
In silicon photonics, optical coupling between optical fibers and silicon photonics chips still remains a big issue to be improved. Recently we have developed a new surface coupler consisting of a vertically-bent silicon waveguide using ion implantation as a bending method. This bending method enabled bending of silicon waveguide terminals to the vertical surface direction with curvature radii as small as several μm and bending of propagation direction of light to the surface direction with broadband wavelength property. In our initial studies, to couple the propagated light with optical fibers efficiently, we taper-narrowed the tips of the waveguide terminals from 440 nm to ~200 nm to expand the mode field and obtained a coupling loss of ~2 dB in TE-polarization mode for a lensed fiber with a beam diameter of 2 μm. We are now developing couplers with high coupling efficiencies for 5 μm mode field diameter fibers. Such mode field diameters are available by HNA fibers and position alignment accuracy can be mitigated to a micron level. In addition, HNA fibers can be fusion-spliced to standard single mode fibers. Using 3D-FDTD simulation we have demonstrated that <1dB coupling is possible if the tip of the bent waveguide is taper-narrowed to 50 nm and covered with a lens-shaped SiO2 dome. In practice, such a structure could be fabricated successfully and 5 dB coupling with a 5 μm mode field diameter lensed fiber has been demonstrated in our initial experiment
影响因子:
4.7
作者:
吉田 知也;面田 恵美子;渥美 裕樹;西 孝;田島 渉吾;三浦登;森 雅彦;榊原 陽一
通讯作者:
榊原 陽一
DOI:
--
发表时间:
2015
期刊:
影响因子:
--
作者:
T. Yoshida;E. Omoda;Y. Atsumi;M. Mori;Y. Sakakibara
通讯作者:
Y. Sakakibara