基于薄膜铌酸锂的双偏振光学模式复用器(特邀)  

Dual-Polarization Optical Mode Multiplexer Based on Thin-Film Lithium Niobate(Invited)

作　　者：蒋永恒 李星峰 沈健[2] 肖恢芙 袁明瑞 张朴 李颖弢[1] 张永[2] 苏翼凯[2] 田永辉 Jiang Yongheng;Li Xingfeng;Shen Jian;Xiao Huifu;Yuan Mingrui;Zhang Pu;Li Yingtao;Zhang Yong;Su Yikai;Tian Yonghui(School of Physical Science and Technology,Lanzhou University,Lanzhou 730000,Gansu,China;State Key Laboratory of Advanced Optical Communication Systems and Networks,Department of Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]兰州大学物理科学与技术学院,甘肃兰州730000 [2]上海交通大学区域光纤通信网与新型光通信系统国家重点实验室,电子工程系,上海200240

出　　处：《光学学报》2024年第15期101-110,共10页Acta Optica Sinica

基　　金：国家自然科学基金(62075091,62205135);甘肃省重点研发计划项目(22YF7GA008,23YFGA0007);甘肃省自然基金重点项目(23JRRA1026,22JR5RA493)。

摘　　要：双偏振模式复用器由于只需要单个波长的激光源即可实现多信道复用,从而降低光链路的成本和功耗,目前已经受到研究人员的广泛关注。然而,由于绝缘体上铌酸锂(LNOI)平台中存在模式杂化现象,在该平台上制备双偏振模式复用器仍然具有一定的挑战。本文在SiN-LNOI平台上提出并实验验证了具有6个数据通道的双偏振光学模式复用器,使用亚波长光栅调控不同模式的色散,以抑制模式杂化引入的串扰。所测得的器件插入损耗和模间串扰分别为3.1 dB和-10.1 dB。此外,成功演示了总净数据容量为1.52 Tbit/s的动态数据传输实验,这表明所提器件在未来高速大容量光通信中具有较大的应用潜力。Objective Lithium niobate on insulator(LNOI)has emerged as a promising integrated photonic platform for on-chip optical interconnection and optical communications,which is due to its outstanding characteristics,such as excellent electro-optic properties and strong optical nonlinearity.Diverse important active photonic circuit components have been proposed,including electro-optic modulators and wavelength converters.In particular,the electro-optic bandwidth of the LNOI modulator has reached up to 100 GHz and beyond,thus improving the data capacity of optical links significantly.However,with the continuous data capacity growth,the modulation rate of a single modulator will be challenging to meet the application demands.Therefore,developing a series of advanced optical multiplexers is necessary to further improve the data capacity.Recently,some advanced optical(de)multiplexing technologies have been intensively studied and reported in the LNOI platform,such as wavelength division multiplexing,polarization division multiplexing,and mode division multiplexing.Multidimensional hybrid multiplexing technologies are more important for further improving the data capacity of optical links.Among them,the dual-polarization mode(de)multiplexer(MMUX)has become a promising device as it can achieve multichannel multiplexing by only employing a single-wavelength laser,which thus lessens the cost and power consumption of optical links.However,challenges remain in realizing dual-polarization MMUX in the LNOI platform compared with the silicon-on-insulator(SOI)platform.Specifically,mode hybridization will occur in special width waveguides due to the vertical asymmetry and material anisotropy of the LNOI platform,which will introduce a lot of mode crosstalk in the bus waveguide.Therefore,we propose and demonstrate a dual-polarization MMUX with six data channels in the LNOI platform,with a subwavelength-grating taper adopted to engineer the dispersion of different modes to suppress the mode hybridization.Methods We employ the finite el

关 键 词：集成光学 薄膜铌酸锂 氮化硅 偏振复用 模式复用 亚波长光栅 

分 类 号：O436[机械工程—光学工程]