光学学报, 2017, 37 (10): 1013001, 网络出版: 2018-09-07   

基于多模干涉的椭圆型十字波导的设计与仿真 下载: 853次

Design and Simulation of Elliptical Crossing Waveguide Based on Multimode Interference
作者单位
1 浙江工业大学理学院, 浙江 杭州 310023
2 浙江工业大学环境学院, 浙江 杭州 310014
摘要
设计了一种高效的、基于多模干涉(MMI)的椭圆型十字光波导,通过增加模式匹配器和调整自聚焦点位置,降低其传输损耗。COMSOL仿真表明该波导在1550 nm 波长处的透射率高达96.5%,串扰损耗小于2×10 -5,而传统的椭圆型十字波导的透射率仅为91.2%。并且对椭圆型MMI的成像规律进行了理论分析和仿真验证, 结果表明这种新型椭圆型结构不但在1550 nm处表现出高效性,对整个1500~1600 nm的通信波段都具有非常低的损耗(小于0.2 dB)和串扰(小于-42 dB)。这种十字光波导尺寸小、结构简单,只需要在硅上绝缘体(SOI)基底材料上融刻一次即可实现,制备工艺简单,有利于节约成本和批量生产,广泛适用于未来的集成光路。
Abstract
We design an elliptical crossing waveguide with high efficiency based on multimode interference (MMI), adding a mode matcher and adjusting the self-focusing position to reduce its transmission loss. The COMSOL simulation shows that the transmittance of the waveguide reaches 96.5% and the crosstalk loss is less than 2×10 -5 at 1550 nm, while the transmittance is 91.2% for traditional elliptical crossing waveguide. The imaging law of elliptical MMI is analyzed theoretically and verified in simulation. The results show that the new elliptical structure not only exhibits high efficiency at 1550 nm, but also has very low loss (less than 0.2 dB) and crosstalk (less than -42 dB) for the whole communication band from 1500 nm to 1600 nm. This cross-light waveguide is small-sized, simple-structured, and is formed by only one step etching with the grating couplers on a silicon-on-insulator (SOI) platform. It has simple preparation process and is conducive to cost savings and mass production. So it will be widely used in integrated optics in the future.

乐孜纯, 徐自力, 孙琛, 杜颖, 董文. 基于多模干涉的椭圆型十字波导的设计与仿真[J]. 光学学报, 2017, 37(10): 1013001. Zichun Le, Zili Xu, Chen Sun, Ying Du, Wen Dong. Design and Simulation of Elliptical Crossing Waveguide Based on Multimode Interference[J]. Acta Optica Sinica, 2017, 37(10): 1013001.

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