The supermode analysis of asymmetrical directional couplers (ADC) based on SOI technology for strip and ridge structures at 1550 nm is herein reported, targeting to reduce ADC device fabrication requirements. The reported analysis based on supermodes permits us to assess the sensitivity of the ADC coupling efficiency by calculating the index difference between even and odd supermodes. Optimum designs have been found for 100 and 400 nm gaps, respectively, capable of converting and (de) multiplexing both ${\mathrm{TE}}_0$ and ${\mathrm{TE}}_1$ modes taking into account the width, gap, height, and slab thickness variations produced with respect to the nominal design.

中文翻译：

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具有高维变化容限的脊形和带状SOI技术上的非对称定向耦合器设计

本文报道了基于SOI技术的非对称定向耦合器（ADC）在1550 nm处的超模式分析，其目的是减少ADC器件的制造要求。报告的基于超模的分析使我们能够通过计算偶数和奇数超模之间的指数差来评估ADC耦合效率的灵敏度。已经发现分别针对100和400 nm间隙的最佳设计，能够同时对两者进行转换和（解复用）${\mathrm{TE}}_0$ 和 ${\mathrm{TE}}_{\mathrm{1个}}$ 考虑到名义设计产生的宽度，间隙，高度和板坯厚度变化的两种模式。