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Compact and efficient large cross-section SOI rib waveguide taper optimized by a genetic algorithm

机译:紧凑型高效的大横截面SOI肋骨波导锥度通过遗传算法进行优化

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摘要

A genetic algorithm is applied to optimize a taper between a large cross-section silicon-on-insulator (SOI) rib waveguide and a single-mode fiber to achieve an ultra-compact and highly efficient coupling structure. The coupling efficiency is taken as the objective function of the genetic algorithm in the taper optimization process. To apply the optimization algorithm, the taper is segmented into several sections. Three encoding forms and a two-step optimization strategy are adopted in the optimization process, resulting in a 10μm long taper with a coupling efficiency of 93.30% in quasi-TE mode at 1550nm. The characteristics of the optimized taper including the field profile, spectrum and fabrication tolerances in both horizontal and vertical directions are investigated via a three dimensional eigenmode expansion (EME) method, indicating that the optimized taper is compatible with the prevailing integrated circuit (IC) processing technology.
机译:应用遗传算法以优化大横截面硅 - 绝缘体(SOI)肋波导和单模光纤之间的锥形,以实现超紧凑且高效的耦合结构。耦合效率被视为锥形优化过程中遗传算法的目标函数。要应用优化算法,锥度将分段为几个部分。优化过程采用了三种编码形式和两步优化策略,导致10μm长的锥度,耦合效率为1550nm的准tE模式下为93.30%。通过三维Eigenmode扩展(EME)方法研究了包括场曲线,横向和垂直方向上的场曲线,光谱和制造公差的优化锥度的特性,表明优化的锥形与主要的集成电路(IC)处理兼容技术。

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