基于薄膜铌酸锂平台的紧凑型慢光 waveguide 和调制器。（注：这里“waveguide”常见释义为“波导” ）

Compact slow-light waveguide and modulator on thin-film lithium niobate platform.

作者信息

Chen Gengxin, Wang Haohua, Chen Bin, Ruan Ziliang, Guo Changjian, Chen Kaixuan, Liu Liu

机构信息

State Key Laboratory for Modern Optical Instrumentation, College of Optical Science and Engineering, International Research Center forAdvanced Photonics, Zhejiang University, Hangzhou 310058, China.

Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, Sci, Bldg. No.5, South China Normal University, Higher-Education Mega-Center, Guangzhou 510006, China.

出版信息

Nanophotonics. 2023 Aug 23;12(18):3603-3611. doi: 10.1515/nanoph-2023-0306. eCollection 2023 Sep.

DOI:10.1515/nanoph-2023-0306

PMID:39635346

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11501771/

Abstract

Lithium niobate Mach-Zehnder modulators (MZMs) with compact footprint and fast electro-optics (EO) responses are highly demanded for the next-generation optical interconnect systems. Here, we demonstrate slow-light (SL) effect using a coupled Bragg resonator structure on the thin-film lithium niobate (TFLN) platform, and an ultra-compact SL-MZM with length of ∼370 μm is also constructed. The fabricated SL waveguides show a large optical passband width of ∼8 nm, an insertion loss of 2.9 dB, and a maximal optical group index of 7.50, corresponding to 3.4 times as large as that of regular TFLN rib waveguide. The fabricated SL-MZM exhibits a large EO bandwidth of >50 GHz in an operating wavelength band of ∼8 nm as well. High-speed OOK transmissions at data rates of 64 Gbit/s and 80 Gbit/s are successfully achieved. To our best knowledge, it is first time to build SL waveguides and compact SL-MZMs with large EO bandwidths of >50 GHz on the monolithic TFLN platform.

摘要

下一代光互连系统对具有紧凑尺寸和快速电光（EO）响应的铌酸锂马赫-曾德尔调制器（MZM）有很高的需求。在此，我们在薄膜铌酸锂（TFLN）平台上利用耦合布拉格谐振器结构展示了慢光（SL）效应，并构建了长度约为370μm的超紧凑SL-MZM。所制备的SL波导显示出约8nm的大光学通带宽度、2.9dB的插入损耗以及7.50的最大光学群折射率，这相当于常规TFLN脊形波导的3.4倍。所制备的SL-MZM在约8nm的工作波长带内也表现出大于50GHz的大EO带宽。成功实现了64Gbit/s和80Gbit/s数据速率的高速开关键控（OOK）传输。据我们所知，这是首次在单片TFLN平台上构建具有大于50GHz大EO带宽的SL波导和紧凑SL-MZM。