基于带有模式分离器的微环谐振器的波长-模式混合复用系统  

Hybrid Wavelength-and Mode-division Multiplexing System Based on Microring Resonators with Mode Splitters

作　　者：韩溪林 章羚璇 薛锦涛 鲍慎雷 吴锦仪 米磊[1] HAN Xilin;ZHANG Lingxuan;XUE Jintao;BAO Shenlei;WU Jinyi;MI Lei(State Key Laboratory of Transient Optics and Photonics,Xi’an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi'an 710119,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室,西安710119 [2]中国科学院大学,北京100049

出　　处：《光子学报》2022年第11期193-201,共9页Acta Photonica Sinica

基　　金：国家自然科学基金(No.61635013)。

摘　　要：在微环谐振器耦合区添加模式分离器,提出一种硅光混合集成的波长复用和模式复用的结构,以解决微环谐振器无法进行模式分离的问题。该微环谐振器的品质因子为3 692,3 dB光学带宽为52 GHz,自由光谱范围为1.03 THz,TE_(0)模式产生的串扰为-11.0 dB,插入损耗低至-0.66 dB。基于此,提出一个双模式输入的发射-接收的模式复用系统。仿真结果显示该系统可以有效分离TE_(0)和TE_(1)模式,且微环具有波长选择能力。系统复用器和解复用器在C波段可以实现超紧凑的波长/模式复用结构。此外,制造公差从-10 nm到+15 nm内滤出端口有大于1 dB的响应,传输端口有小于-20 dB的响应。该微环结构能够同时实现模式和波长选择功能。The applications of silicon photonics in data bearer networks,data centers and other scenarios will support high-speed data transmission.In order to meet the demand,lots of technologies in silicon photonics have emerged,such as Wavelength Division Multiplexing(WDM),Polarization Division Multiplexing(PDM)and Mode Division multiplexing(MDM).To further increase the channel capacity,the hybrid multiplexing technology is studied based on the technologies above.Our work is such a hybrid WDM-MDM multiplexer.This paper focuses on the design of a microring resonator with mode splitter.First of all,the effect of mode splitting is better at a longer length,but we need to put the mode splitter into the microring resonator,and such a high mode separation efficiency and coupling efficiency will lead to low efficiency of microring resonance.So,we take the appropriate length.Secondly,an asymmetric structure for the geometry of the mode splitter is designed.One side of the structure is a waveguide with a width of0.88 nm,allowing high order mode transmission,and the other side is a slot waveguide with a width of0.86 nm,with an air gap of 50 nm in the middle.The advantage of this structure is that it can effectively split TE_(0)and TE_(1)modes.In addition,for microring resonators,we can select the desired resonant wavelength by designing appropriate parameters such as radius,waveguide width,coupling region length and gap.By simulating the proposed structure with the finite difference time domain method,the multiplexer and demultiplexer can realize ultra-compact WDM-MDM structure at C band.The microring resonator has a response of-0.66 dB to TE_(1)mode input,a Q value of 3 692,and an optical bandwidth of 52 GHz.Its free spectral range is 1.03 THz,and the crosstalk generated by TE_(0)mode is-11.0 dB.The insertion loss of the microring resonator is as low as-0.66 dB.Based on this,we also propose a transmitter-receiver MDM system with dual mode input.The simulation results show that the dual-mode input MDM system based on microring res

关 键 词：硅光子学 光通信 波分复用 模分复用 混合复用 微环谐振器 模式分离器 

分 类 号：TN256[电子电信—物理电子学]