铌酸锂集成光子芯片端面耦合器件(特邀)  

Edge-Coupling Device on Lithium-Niobate-Integrated Photonic Chips(Invited)

作　　者：贾笛 郝振中 薄方 张国权 许京军 Jia Di;Hao Zhenzhong;Bo Fang;Zhang Guoquan;Xu Jingjun(The Key Laboratory of Weak Light Nonlinear Photonics,Ministry of Education,TEDA Institute of Applied Physics,School of Physics,Nankai University,Tianjin 300457,China)

机构地区：[1]弱光非线性光子学教育部重点实验室,南开大学泰达应用物理研究院,物理科学学院,天津300457

出　　处：《激光与光电子学进展》2024年第11期164-173,共10页Laser & Optoelectronics Progress

基　　金：国家重点研发项目(2019YFA0705000);国家自然科学基金(92250302,12034010,12134007,92050111,12074199);111项目(B23045)。

摘　　要：薄膜铌酸锂(TFLN)具有优异的电光和光学非线性特性,是开展电光调制器、非线性光学频率转换器等相关研究的重要平台。然而,由于TFLN片上光波导与光纤模场尺寸存在显著差异,严重限制了二者之间的高效耦合。因此,高效率端面耦合器成为了突破TFLN集成光学芯片应用限制瓶颈的重要手段。将对TFLN端面耦合器的研究进展进行系统综述,首先介绍常见的几种参与端面耦合的光纤特性;然后,介绍端面耦合器中铌酸锂端面耦合波导的典型结构,如单层或多层倒锥形波导、楔形波导等,并对相关的包层材料的选择及制备方法进行讨论;最后,对端面耦合器研究现状、存在的问题等做出总结,并展望未来可能的发展方向。Thin-film lithium niobate(TFLN)exhibits excellent electro-optic and optical nonlinear properties,and is an important platform for research on electro-optic modulators and nonlinear optical frequency converters.However,the significant difference in mode field sizes between the optical waveguides on TFLN films and optical fibers severely restricts efficient coupling between them.Consequently,high efficiency end couplers are valuable for breaking through the application bottleneck of TFLN-integrated optical chips.In this paper,a systematic review of the research progress of TFLN edge couplers is presented.First,the common characteristics of optical fibers involved in edge coupling are introduced.Subsequently,the typical structures of lithium niobate edge-coupling waveguides,such as single layer or multilayer inverse-tapered waveguides and wedge waveguides,are discussed.The selection and fabrication methods for related cladding materials are also described.Finally,the current research status and existing challenges in using edge couplers are summarized,and directions for potential future development are proposed.

关 键 词：薄膜铌酸锂 端面耦合器 倒锥形波导 楔形波导 

分 类 号：O436[机械工程—光学工程]