硅基槽式纳米线多模干涉型模阶数转换器全矢量分析

发布时间：2018-03-17 14:00

本文选题：模阶数转换器　切入点：多模干涉　出处：《物理学报》2017年07期 　论文类型：期刊论文

【摘要】：提出了一种基于硅基槽式纳米线结构的紧凑式1×2多模干涉器型模阶数转换器,其中输入/输出通道为槽式直波导,经线性锥形过渡器连接居于中心的二次锥形槽式多模波导.采用全矢量频域有限差分法详细分析了垂直槽波导的模式特性,选取电场主分量E_y得到增强的quasi-TM模作为转换器的光信号模式.对比分析了矩形结构与二次锥形结构中的周期自镜像效应,发现二次锥形结构尺寸更短、损耗更低的特点.根据自镜像效应中一阶模成像位置设计多模干涉区域长度,经线性锥形过渡器从较宽输出端口输出一阶模,从较窄输出端口输出基模,从而实现模阶数转换功能.采用三维有限时域差分法详细分析了该转换器的光波传输特性,详细讨论了器件关键结构参数的制作容差.参数优化结果表明,该转换器的多模干涉区域的尺寸为3×5μm~2时,在1.55μm工作波长下,quasi-TM基模在输出quasi-TM一阶模端口的插入损耗约为0.35 dB,输出波导间的串扰约为-16.9 dB.另外,给出了输入模场主分量在器件中的传输演变情况.
[Abstract]:A compact 1 脳 2 multimode interferometer type A / D converter based on silicon channel nanowire structure is proposed, in which the input / output channels are slot straight waveguides. The second conical slot multimode waveguide is connected with a linear conical transition device. The mode characteristics of the vertical slot waveguide are analyzed in detail by using the full vector frequency domain finite difference method. The enhanced quasi-TM mode obtained from the electric field principal component Estack is selected as the optical signal mode of the converter. The periodic self-mirroring effect in the rectangular structure and the secondary conical structure is compared and analyzed. It is found that the size of the secondary conical structure is shorter than that of the secondary conical structure. According to the position of the first mode imaging in the self-mirroring effect, the length of the multimode interference region is designed, and the first order mode is output from the wider output port and the base mode is output from the narrower output port through the linear conical converter. The optical wave transmission characteristics of the converter are analyzed in detail by using 3D finite-time-domain difference method, and the fabrication tolerances of the key structural parameters of the device are discussed in detail. The results of parameter optimization show that, The size of the multimode interference region of the converter is 3 脳 5 渭 m ~ 2:00. The insertion loss of quasi-TM base mode at the output quasi-TM first-order mode port is about 0.35 dB, and the crosstalk between output waveguides is -16.9 dB at 1.55 渭 m operating wavelength. The transmission evolution of the input mode master component in the device is given.
【作者单位】：东南大学电子科学与工程学院;
【基金】：国家自然科学基金(批准号:11574046,60978005) 江苏省自然科学基金(批准号:BK20141120)资助的课题~~
【分类号】：TN252;TB383.1

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