Review
Optics
Milad Gholipour Vazimali, Sasan Fathpour
Summary: Photonics on thin-film lithium niobate (TFLN) is a highly sought-after discipline in integrated optics, offering ultracompact and low-loss optical waveguides and devices. It has revitalized the traditional and commercial applications of lithium niobate for optical modulators and wavelength converters, while also providing opportunities for various other applications such as optical amplification and oscillation, nonlinear effects, optical frequency comb generation, and quantum optics.
ADVANCED PHOTONICS
(2022)
Article
Nanoscience & Nanotechnology
Gengxin Chen, Haohua Wang, Bin Chen, Ziliang Ruan, Changjian Guo, Kaixuan Chen, Liu Liu
Summary: In this study, slow-light effect is achieved using a coupled Bragg resonator structure on the thin-film lithium niobate platform, and an ultra-compact slow-light Mach-Zehnder modulator is fabricated. The fabricated slow-light waveguides exhibit a large optical passband width, low insertion loss, and high optical group index. The fabricated slow-light Mach-Zehnder modulator has a large electro-optical bandwidth of >50 GHz and enables high-speed transmissions at data rates of 64 Gbit/s and 80 Gbit/s.
Article
Optics
Junxia Zhou, Youting Liang, Zhaoxiang Liu, Wei Chu, Haisu Zhang, Difeng Yin, Zhiwei Fang, Rongbo Wu, Jianhao Zhang, Wei Chen, Zhe Wang, Yuan Zhou, Min Wang, Ya Cheng
Summary: Utilizing the PLACE technique, on-chip light amplification with integrated optical waveguide fabricated on erbium-doped thin-film lithium niobate on insulator (TFLNOI) was demonstrated with a maximum internal net gain of 18 dB. This work opens the way for the monolithic integration of diverse active and passive photonic components on the TFLNOI platform.
LASER & PHOTONICS REVIEWS
(2021)
Review
Optics
Yuechen Jia, Jiangwei Wu, Xiaoli Sun, Xiongshuo Yan, Ranran Xie, Lei Wang, Yuping Chen, Feng Chen
Summary: Rare-earth ion doped crystalline materials have diverse applications in photonics, and incorporating them into integrated photonics can enrich design capabilities. RE:LNOI photonics meets the demand for chip-integrated laser sources, optical amplifiers, and quantum memories. This article provides a timely review of the development of RE:LNOI photonics and discusses future directions in lithium-niobate integrated photonics.
LASER & PHOTONICS REVIEWS
(2022)
Article
Engineering, Electrical & Electronic
Uday Saha, Edo Waks
Summary: This paper presents the design of a photonic Bell-state analyzer on a reconfigurable thin-film lithium niobate platform for polarization-encoded qubits. The optimized device achieves high fidelity entanglement between trapped ions and has potential applications in trapped ion quantum computing and other optically active spin qubits.
IEEE PHOTONICS JOURNAL
(2022)
Article
Optics
Xingrui Huang, Yang Liu, Donghe Tu, Zhiguo Yu, Qingquan Wei, Zhiyong Li
Summary: In this work, a linearity-enhanced dual-parallel Mach-Zehnder modulator (MZM) on a thin-film lithium niobate platform is reported. By setting specific optical and electrical splitting ratios, the third-order intermodulation distortions (IMD3) of the child MZMs cancel with each other, while the first-order harmonics (FH) reach the maximum. The use of passive devices improves device stability and simplifies operation complexity.
Article
Optics
Xuanhao Wang, An Pan, Tingan Li, Cheng Zeng, Jinsong Xia
Summary: Thin-film lithium niobate coherent modulators have shown promise for the next generation coherent communication system, with high-performance polarization splitter-rotators (PSRs) being crucial for achieving dual polarization coherent modulators. A PSR demonstrated on the lithium niobate on insulator (LNOI) platform has shown excellent performance and fabrication tolerance, making it a potential candidate for use in polarization-division multiplexing optical transmitters.
Article
Optics
Yang Liu, Xingrui Huang, Huan Guan, Zhiguo Yu, Qingquan Wei, Zhongchao Fan, Weihua Han, Zhiyong Li
Summary: A four-channel coarse wavelength division multiplexing (CWDM) (de)multiplexer based on a thin film lithium niobate-silicon rich nitride hybrid platform has been designed, with excellent optical performance and center wavelengths aligning with the ITU-T G.694.2 standard.
Article
Optics
Yuan Zhou, Yiran Zhu, Zhiwei Fang, Shupeng Yu, Ting Huang, Junxia Zhou, Rongbo Wu, Jian Liu, Yu Ma, Zhe Wang, Jianping Yu, Zhaoxiang Liu, Haisu Zhang, Zhenhua Wang, Min Wang, Ya Cheng
Summary: This work presents a robust low-loss optical interface for passive/active lithium niobate photonics by tiling passive and active thin film lithium niobate (TFLN) substrates. The tiled substrates allow for patterning the integrated device's mask using a single continuous photolithography process. The interface loss of the tiled substrate is measured to be as low as 0.26 dB. A four-channel waveguide amplifier with net gains of 5 dB and 8 dB at 1550 nm and 1530 nm wavelengths, respectively, is achieved through this approach. The robust low-loss optical interface facilitates the development of large-scale high-performance photonic devices with on-chip light sources and amplifiers.
LASER & PHOTONICS REVIEWS
(2023)
Article
Physics, Applied
Likai Yang, Yuntao Xu, Chunzhen Li, Jiacheng Xie, Mohan Shen, Hong X. Tang
Summary: In this study, we investigate the coupling between microwave and phononic modes in thin-film lithium niobate (LN) by studying niobium nitride resonators directly deposited on LN thin films. Our findings reveal that overlapping electric fields can inadvertently excite bulk acoustic modes within the substrate, inducing microwave loss. This research is of significance for the design of piezoelectric systems and microwave components for quantum transduction devices.
PHYSICAL REVIEW APPLIED
(2023)
Correction
Optics
Juanjuan Lu, Ayed Al Sayem, Zheng Gong, Joshua B. Surya, Chang-Ling Zou, Hong X. Tang
Summary: This erratum corrects a typographic error that appeared in Table 1 of our previous paper.
Article
Computer Science, Information Systems
Fan Yang, Yuhao Wu, Changlong Cai, Hong Fang, Elias Stathatos
Summary: This study proposes and simulates a numerical analysis of a diamond racetrack microring resonator on a lithium niobate thin film, operating at a 1.55 μm wavelength. The designed resonator exhibits a high quality factor and a high coupling efficiency, achieving resonant tunability near the 1.55 μm wavelength.
Article
Engineering, Electrical & Electronic
Xuerui Liang, Li Fu, Qianchen Yu, Zhenfeng Xue, Xiaodong Shi, Yaoqin Lu, Honggang Chen, Bo Zhang, Yong Luo, Qianggao Hu, Haiyan Ou, Weidong Ma
Summary: Thin-film lithium niobate on insulator (LNOI) has shown promise for high-speed optical communication. An efficient, polarization-insensitive, misalignment-tolerant and broadband fiber-to-chip edge coupler based on trident spot-size convertor (SSC) is presented in this letter.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Optics
Jia-Min Liu, De -Long Zhang
Summary: This paper proposes and models an ultra-broadband TM-pass waveguide polarizer based on a thin-film LiNbO3-on-insulator waveguide and sub-wavelength grating (SWG) metamaterials. The device consists of an SWG as a polarization filter, and two coupling regions to reduce mode mismatch loss. Simulation results show that the polarizer can achieve an ultra-large bandwidth of -415 nm (1.26-1.675 mu m) with low insertion loss (<1.1 dB) and high extinction ratio (>29.4 dB). Additionally, the proposed polarizer can tolerate deviations in the width and thickness of the nano-stripes by 5 nm. This ultra-broadband device may have applications in high-capacity optical communication systems, and it is the first of its kind proposed on the lithium-niobate-on-insulator platform, to the best of our knowledge.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Mingwei Jin, Jiayang Chen, Yongmeng Sua, Prajnesh Kumar, Yuping Huang
Summary: The research introduces a novel dual-capacitor electrode layout for thin-film lithium niobate, significantly enhancing the electro-optical modulation efficiency and reducing the required electric power. This technique has the potential to boost the performance of applications at the interface of integrated electronics and optics.