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

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

doi:10.1515/nanoph-2023-0306

Nanophotonics (Aug 2023)

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

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

Affiliations

Chen Gengxin: State Key Laboratory for Modern Optical Instrumentation, College of Optical Science and Engineering, International Research Center forAdvanced Photonics, Zhejiang University, Hangzhou 310058, China
Wang Haohua: 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
Chen Bin: State Key Laboratory for Modern Optical Instrumentation, College of Optical Science and Engineering, International Research Center forAdvanced Photonics, Zhejiang University, Hangzhou 310058, China
Ruan Ziliang: State Key Laboratory for Modern Optical Instrumentation, College of Optical Science and Engineering, International Research Center forAdvanced Photonics, Zhejiang University, Hangzhou 310058, China
Guo Changjian: 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
Chen Kaixuan: 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
Liu Liu: State Key Laboratory for Modern Optical Instrumentation, College of Optical Science and Engineering, International Research Center forAdvanced Photonics, Zhejiang University, Hangzhou 310058, China

DOI: https://doi.org/10.1515/nanoph-2023-0306
Journal volume & issue: Vol. 12, no. 18
pp. 3603 – 3611

Abstract

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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 L 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.

Published in Nanophotonics

ISSN: 2192-8606 (Print); 2192-8614 (Online)
Publisher: De Gruyter
Country of publisher: Germany
LCC subjects: Science: Physics
Website: https://www.degruyter.com/journal/key/nanoph/html#submit

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