Ultracompact dual-mode waveguide crossing based on subwavelength multimode-interference couplers  

作　　者：WEIJIE CHANG LULUZI LU XINSHU REN DONGYU LI ZEPENG PAN MENGFAN CHENG DEMING LIU MINMING ZHANG 

机构地区：[1]School of Optical and Electrical Information, Huazhong University of Science and Technology [2]Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology

出　　处：《Photonics Research》2018年第7期660-665,共6页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(NSFC)(61775069)

摘　　要：We propose and experimentally demonstrate a novel ultracompact dual-mode waveguide crossing based on subwavelength multimode-interference couplers for a densely integrated on-chip mode-division multiplexing system.By engineering the lateral-cladding material index and manipulating phase profiles of light at the nanoscale using an improved inverse design method, a subwavelength structure could theoretically realize the identical beat length for both TE_0 and TE1, which can reduce the scale of the device greatly. The fabricated device occupied a footprint of only 4.8 μm× 4.8 μm. The measured insertion losses and crosstalks were less than 0.6 d B and-24 d B from 1530 nm to 1590 nm for both TE0 and TE1 modes, respectively. Furthermore, our scheme could also be expandedto design waveguide crossings that support more modes.We propose and experimentally demonstrate a novel ultracompact dual-mode waveguide crossing based on subwavelength multimode-interference couplers for a densely integrated on-chip mode-division multiplexing system.By engineering the lateral-cladding material index and manipulating phase profiles of light at the nanoscale using an improved inverse design method, a subwavelength structure could theoretically realize the identical beat length for both TE_0 and TE1, which can reduce the scale of the device greatly. The fabricated device occupied a footprint of only 4.8 μm × 4.8 μm. The measured insertion losses and crosstalks were less than 0.6 d B and-24 d B from 1530 nm to 1590 nm for both TE0 and TE1 modes, respectively. Furthermore, our scheme could also be expandedto design waveguide crossings that support more modes.

关 键 词：亚波长结构 波导理论 通讯技术 技术创新 

分 类 号：TN16[电子电信—物理电子学] TN25