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Compact and broadband 3D mode (de)multiplexer via displacement of an asymmetric slot-strip coupler
Journal of the Optical Society of America B ( IF 1.9 ) Pub Date : 2020-11-06 , DOI: 10.1364/josab.404439
Xinguo Wang , Jinzhu Hu , Jinye Miao , Weifeng Jiang

A compact and broadband three-dimensional (3D) quasi-${{\rm TE}_0}$ and quasi-${{\rm TE}_1}$ mode (de)multiplexer [(De)MUX] is proposed via an asymmetric slot-strip coupler, in which the optimally lateral displacement between the bottom silicon slot waveguide and the upper poly-silicon strip-waveguide can enable the vertical mode-coupling efficiently. The design of the proposed 3D mode (De)MUX is based on the full-vectorial finite-element method, 3D full-vectorial finite-difference time-domain method, and mode expansion method. The optimized 3D mode (De)MUX is with a compact coupling length of only 5.65 µm, a broad 3 dB bandwidth of 231.5 nm, a low insertion loss of 0.3 dB, and a mode cross talk of ${-}{27.54}\;{\rm dB}$. The fabrication tolerance is also studied with a width error of ${\pm}{20}\;{\rm nm}$ for both the upper and lower layers.

中文翻译:

通过非对称缝隙-带状耦合器的位移实现紧凑的宽带3D模式(解)多路复用器

提出了一种紧凑的宽带三维(3D)准$ {{\ rm TE} _0} $和准$ {{\ rm TE} _1} $模式(解复用器)[(De)MUX]非对称缝隙-带耦合器,其中底部硅缝隙波导和上部多晶硅带状波导之间的最佳横向位移可以有效地实现垂直模式耦合。所提出的3D模式(De)MUX的设计基于全矢量有限元方法,3D全矢量有限差分时域方法和模式扩展方法。经过优化的3D模式(De)MUX的耦合长度仅为5.65 µm,3 dB带宽为231.5 nm,插入损耗仅为0.3 dB,模式串扰为$ {-} {27.54} \ ; {\ rm dB} $。还以上层和下层的宽度误差为$ {\ pm} {20} \; {\ rm nm} $来研究制造公差。
更新日期:2020-12-02
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