基于硅基光电子芯片的低损耗动态偏振控制器  

Low-loss integrated dynamic polarization controller based on silicon photonics

作　　者：赵倩如 王旭阳[1,2] 贾雁翔 张云杰 卢振国 钱懿 邹俊[3] 李永民[1,2] Zhao Qian-Ru;Wang Xu-Yang;Jia Yan-Xiang;Zhang Yun-Jie;Lu Zhen-Guo;Qian Yi;Zou Jun;Li Yong-Min(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China;ZJU-Hangzhou Global Scientific and Technological Innovation Center,Zhejiang University,Hangzhou 311215,China)

机构地区：[1]山西大学光电研究所,量子光学与光量子器件国家重点实验室,太原030006 [2]山西大学,省部共建极端光学协同创新中心,太原030006 [3]浙江大学,浙江大学杭州国际科创中心,杭州311215

出　　处：《物理学报》2024年第2期181-191,共11页Acta Physica Sinica

基　　金：山西省应用基础研究计划(批准号:202103021224010);山西省省筹资金资助回国留学人员科研项目(批准号:2022-016);航空科学基金(批准号:20200020115001);国家自然科学基金(批准号:62175138,62205188,11904219);量子光学与光量子器件国家重点实验室开放课题(批准号:KF202006);山西省“1331”工程重点项目资助的课题。

摘　　要：动态偏振控制器能够实现输入光场任意偏振态到输出光场任意偏振态的控制,可以动态补偿长距离单模光纤导致的双折射效应,是量子通信和相干通信系统中的重要器件.本文设计并实验验证了基于硅基光电子芯片的低损耗动态偏振控制器,芯片采用标准的绝缘体上硅工艺制作,器件整体尺寸为5.20 mm×0.12 mm×0.80 mm,整体损耗为5.7 dB,最大功耗为0.2W.基于可变步长.模拟退火算法、低噪声探测器和高静态消光比的器件,动态偏振消光比可锁定至30 dB以上.芯片采用热相移器对TE0光场的相位延迟量进行控制,整体为0°/45°/0°/45°结构,可实现无端偏振控制.基于Lumerical软件对核心部件偏振旋转分束结构进行了优化,该结构将以端面耦合方式进入波导中的TM0模式光场转化至另一波导中的TE0模式光场,而原单波导中TE0模式光场不发生转化,实验测得动态偏振控制器的静态偏振消光比可达40 dB以上.该器件具有小体积、低功耗和低成本的特点,可以广泛应用于量子通信和相干通信等领域,特别是需要考虑体积、功耗和成本的应用场合.A dynamic polarization controller(DPC)is an important component in fiber optic communication,optical imaging,and quantum technologies.The DPC can transform any input state of polarization(SOP)into any desired SOP to overcome polarization-related impairments resulting from high internally and externally induced birefringence.In this work,a low-loss silicon photonics-integrated DPC is designed and demonstrated experimentally.The whole chip is fabricated by using industry-standard silicon-on-insulator technology.Using the edge-coupling method,the coupler loss is reduced to less than 2 dB,and the total loss of DPC is reduced to 5.7 dB.Using a variable-step simulated annealing method,for a low-noise photodetector and high-staticextinction-ratio device,a dynamic polarization extinction ratio can reach more than 30 dB.The size of the DPC on the chip is 5.20 mm×0.12 mm×0.80 mm.The DPC utilizes a 0°/45°/0°/45°structure,which can realize arbitrary polarization-based coordinate conversion with endless polarization control.The 0°and 45°transform structures and matrices are presented,and the principle of the 0°and 45°structures is explained in detail by using the Poincarésphere.A simulation using Lumerical is conducted to optimize the polarization rotator-splitter,which can transform the TM0 mode light in one waveguide into the TE0 mode light in the other waveguide while the TE0 mode light in one waveguide remains unchanged.Based on the optimized structure,the static polarization extinction ratio of DPC can be measured to be a value greater than 40 dB.The thermal phase shift(TPS)is characterized by using a Mach-Zehnder modulator.The length of the TPS is 400μm,and the resistance of the metal heater is 2.00 kΩ.The maximum power consumed by the four TPSs is a total of 0.2 W.The modulation bandwidth of the DPC designed by our group is approximately 30 kHz.By considering an applied voltage of 5.6 V in the case of the TPS,the bandwidth-voltage product is 5.6×30=168 kHz·V.To optimize the DPC parameters,such as the ste

关 键 词：动态偏振控制器 偏振旋转分束 偏振消光比 硅基光芯片 

分 类 号：TN40[电子电信—微电子学与固体电子学] O431.2[机械工程—光学工程]