基于薄膜铌酸锂的偏振无关电光调制器(特邀)  

Polarization-Independent Electro-Optical Modulator Based on Thin-Film Lithium Niobate(Invited)

作　　者：王宗 陈冠宇 余宇[1] 张新亮[1] Wang Zong;Chen Guanyu;Yu Yu;Zhang Xinliang(Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430070,Hubei,China;Department of Electrical and Computer Engineering,National University of Singapore,Singapore 117583)

机构地区：[1]华中科技大学武汉国家光电研究中心,湖北武汉430070 [2]新加坡国立大学电气与计算机工程系,新加坡117583

出　　处：《激光与光电子学进展》2024年第11期57-62,共6页Laser & Optoelectronics Progress

摘　　要：基于偏振无关光分束器和模式转换器,提出一种基于薄膜铌酸锂(TFLN)的偏振无关电光调制器。其中,偏振无关光分束器可以实现TE0和TM0模式的精准分束,模式转换器能够将输入的TM0模式高效转换为TE1模式。在此基础上,使用周期性电容加载的行波电极结构可实现对两种模式光的高效电光调制。仿真结果表明,该调制器的电光带宽大于100 GHz,有助于解决现有电光调制器因偏振敏感而导致的不稳定问题,为基于TFLN的调制器开辟了新的研究思路。A polarization-independent electro-optical modulator based on thin-film lithium niobate(TFLN)is proposed;it is based on a polarization-independent beam splitter and a mode converter.The polarization-independent beam splitter achieves precise beam splitting of TE0 and TM0 modes,whereas the mode converter efficiently converts the input TM0 mode to TE1 mode.Accordingly,the traveling-wave electrode structure loaded with periodic capacitors achieves efficient electro-optical modulation of two light modes.The simulation results show that the electro-optical bandwidth of the modulator is greater than 100 GHz.This helps solve the instability problem caused by polarization sensitivity in existing electro-optical modulators and opens up new research lines for TFLN-based modulators.

关 键 词：薄膜铌酸锂 电光调制器 偏振分束器 模式转换 

分 类 号：TN256[电子电信—物理电子学]