Kaixuan Chen

Ningbo University

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Liu Liu

Zhejiang University

Ziliang Ruan

Zhejiang University

Changjian Guo

South China Normal University

Ranfeng Gan

Sun Yat-sen University

Sailing He

Zhejiang University

Gengxin Chen

Zhejiang University

Jianhao Zhang

Centre de Nanosciences et de Nanotechnologies

Daoxin Dai

Zhejiang University

Qiangsheng Huang

Fujian University of Technology

Haohua Wang

South China Normal University

Cooperative Institutions

South China Normal University

Zhejiang University

Chinese Academy of Sciences

Central South University

Sun Yat-sen University

State Key Laboratory of Modern Optical Instruments

University of Chinese Academy of Sciences

Xiangya Hospital Central South University

Huazhong University of Science and Technology

Ningbo University

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Compact multimode 3dB coupler for on-chip mode division multiplexing

Optical Fiber Communication Conference (2017)

Kaixuan Chen Jianhao Zhang Zhichao Nong Xinlun Cai Sailing He

An on-chip 2*2 3dB coupler designed for multimode waveguide is demonstrated. The two modes from the input multimode waveguide can be simultaneously split in half to the two output multimode waveguides with a 21.8μm long coupling region.

Waveguide

10.1364/ofc.2017.w1b.4

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Low-loss fiber grating coupler on thin film lithium niobate platform

APL Photonics (2022)

Bin Chen Ziliang Ruan Xuancong Fan Wang Zong Jie Liu

A grating coupler with a high coupling efficiency and low back reflections is designed and demonstrated on the thin film lithium niobate platform, which facilitates an efficient interface between a lithium niobate ridge waveguide and a standard single mode fiber. The excellent performances of the present grating coupler are enabled by a cavity-assisted grating structure and a top metal mirror, even though a uniform grating is adopted as the diffractive element. Experimentally, a coupling loss of −0.89 dB at 1552 nm is demonstrated with a 1-dB bandwidth of 45 nm. Low back reflections of <−16.5 dB to the waveguide and <−13.7 dB to the fiber are also achieved from 1536 to 1579 nm.

Coupling loss

Waveguide

Fiber Bragg Grating

10.1063/5.0093033

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Citations (36)

Fabrication of all shallowly etched silicon reflection-type arrayed-waveguide gratings with one stigmatic point

Asia Communications and Photonics Conference 2021 (2014)

Keqi Ma Qiangsheng Huang Jianhao Zhang Sitao Chen Xin Fu

Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text K. Ma, Q. Huang, J. Zhang, S. Chen, X. Fu, D. Dai, Y. Shi, K. Chen, J. Cheng, L. Liu, and S. He, "Fabrication of all shallowly etched silicon reflection-type arrayed-waveguide gratings with one stigmatic point," in Asia Communications and Photonics Conference 2014, OSA Technical Digest (online) (Optica Publishing Group, 2014), paper AF3B.5. Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article

Reflection

10.1364/acpc.2014.af3b.5

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A polarization-insensitive MMI coupler on an x-cut thin film lithium niobate platform

Optics Letters (2024)

Lingfeng Wu Xinke Xing Ziliang Ruan Ranfeng Gan Lu Qi

Thin-film lithium niobate (TFLN) is a promising integrated photonics platform but currently lacks a polarization-insensitive multimode interference (MMI) coupler, a crucial component for polarization-related optical communication applications such as polarization management, polarization-division multiplexing, and polarization-insensitive modulation systems. This paper presents a novel, to the best of our knowledge, approach by rotating the MMI structure on an anisotropic x-cut TFLN at specific angles to compensate for the difference in the beat length between the two polarizations. A polarization-insensitive 1 × 2 MMI coupler is experimentally achieved with measured transmittances of -2.5 to -4 dB for both output ports and polarization modes in the wavelength range of 1520-1580 nm.

10.1364/ol.533030

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Low-loss and broadband polarization-diversity edge coupler on a thin-film lithium niobate platform

Optics Letters (2023)

Gengxin Chen Kaixuan Chen Zejie Yu Liu Liu

Fiber-to-chip coupling is an essential issue for taking high-performance integrated photonic devices into practical applications. On a thin-film lithium niobate platform, such a high-performance coupler featuring low loss, large bandwidth, and polarization independence is highly desired. However, the mode hybridization induced by the birefringence of lithium niobate seriously restricts a polarization-independent coupling. Here, we propose and experimentally demonstrate a high-performance and polarization-diversity cantilever edge coupler (EC) with the assistance of a two-stage polarization splitter and rotator (PSR). The fabricated cantilever EC shows a minimal coupling loss of 1.06 dB/facet, and the fully etched PSR structure shows a low insertion loss (IL) of −0.62 dB. The whole polarization-diversity cantilever EC exhibits a low IL of −2.17 dB and −1.68 dB for TE 0 and TM 0 mode, respectively, as well as a small cross talk of <−15 dB covering the wavelength band from 1.5 µm to 1.6 µm. A polarization-dependent loss <0.5 dB over the same wavelength band is also obtained. The proposed fiber-to-waveguide coupler, compatible with the fabrication process of popular thin-film lithium niobate photonic devices, can work as a coupling scheme for on-chip polarization-diversity applications.

10.1364/ol.494891

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Research Progress on the Posterior Midline Lumbar Spinous Process‐Splitting Approach

Orthopaedic Surgery (2025)

MA Yi-zhong Lu Mao G. Liu Lihua Hu Kaixuan Chen

ABSTRACT The traditional posterior median approach laminectomy is widely used for lumbar decompression. However, the bilateral dissection of paraspinal muscles during this procedure often leads to postoperative muscle atrophy, chronic low back pain, and other complications. The posterior midline spinous process‐splitting approach (SPSA) offers a significant advantage over the traditional approach by minimizing damage to the paraspinal muscles. SPSA reduces the incidence of muscle atrophy and chronic low back pain while maintaining the integrity of the posterior spinal structures. The technique involves longitudinal splitting of the spinous process, which allows for adequate access to the lamina for decompression without detaching the paraspinal muscles. As a result, it provides a clearer surgical field and facilitates muscle preservation, which reduces the risk of postoperative complications. Additionally, SPSA requires only standard surgical instruments, making it accessible in most surgical settings. This paper reviews the anatomical considerations, surgical techniques, and clinical applications of the SPSA, highlighting its effectiveness in reducing muscle atrophy and improving recovery outcomes. The paper also discusses its potential in treating conditions such as lumbar spinal stenosis, disc herniation, and spondylolisthesis. Furthermore, it emphasizes the need for future research to establish the long‐term benefits of SPSA and refine surgical techniques. The results suggest that SPSA is a promising alternative to traditional approaches, with better outcomes in terms of muscle preservation and overall recovery.

Multifidus muscle

Muscle Atrophy

10.1111/os.14355

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Experimental demonstration of simultaneous mode and polarization-division multiplexing based on silicon densely packed waveguide array

Optics Letters (2015)

Kaixuan Chen Siya Wang Sitao Chen Shipeng Wang Chenzhao Zhang

A silicon mode and polarization-division multiplexing scheme based on a densely packed waveguide array structured as a bus waveguide is introduced. A short adiabatic taper is adopted for (de)multiplexing. Such a structure shows theoretical insertion losses that are <0.05 dB and crosstalk that is <-20 dB over a wide wavelength band for all five supported modes. The structures for (de)multiplexing are fabricated and characterized experimentally. A device, which consists of a multiplexer, a 50-μm-long straight-bus waveguide, and a demultiplexer, exhibits insertion losses that are <0.6 dB and crosstalk that is <-15 dB over an 80 nm wavelength band. The demonstrated (de)multiplexer has a total length of 60 μm, and the bus waveguide has an effective width of 1.58 μm.

Polarization-division multiplexing

Waveguide

Crosstalk

Demultiplexer

Optical add-drop multiplexer

10.1364/ol.40.004655

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Citations (41)

Single-Carrier 400-Gb/s DP-16QAM Self-Homodyne Coherent Transmission Using an Integrated Thin-Film Lithium Niobate Polarization Controller

2017 Asia Communications and Photonics Conference (ACP) (2022)

Haiqing Wei Ranfeng Gan Qi Lu Mingzhen Huang Kaixuan Chen

We demonstrate 400-Gb/s SHC transmission over 20-km SSMF using an integrated TFLN polarization controller with a novel APC algorithm. A polarization scrambling speed of up to 210-krad/s is successfully tracked without performance penalty.

Polarization controller

Polarization-division multiplexing

Scrambling

10.1109/acp55869.2022.10088501

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Optimization of polarization-independent grating coupler on lithium-niobate-on-insulator

Applied Optics (2024)

Xinke Xing Bin Chen Kaixuan Chen Liu Liu

Diffraction efficiency

10.1364/ao.537895

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Silicon–Lithium Niobate Hybrid Intensity and Coherent Modulators Using a Periodic Capacitively Loaded Traveling-Wave Electrode

ACS Photonics (2022)

Wang Zong Gengxin Chen Ziliang Ruan Ranfeng Gan Pucheng Huang

High-performance silicon and thin-film lithium niobate hybrid electro-optic modulators are demonstrated. In order to break the voltage–bandwidth limit in a normal traveling-wave modulator, a periodic capacitively loaded traveling-wave electrode is employed in this hybrid platform. The silicon substrate is undercut-etched to achieve index matching of the optical wave and microwave. A hybrid waveguide with a lithium niobate thin film bonded on a silicon wire is employed. Lithium niobate etching is not required for making the hybrid optical waveguides. We realize an intensity modulator of 12.5 mm long modulation section, which exhibits a low half-wave voltage of 1.7 V and a large 3 dB modulation bandwidth of >70 GHz. Data transmissions with various modulation formats beyond 100 Gbit/s are successfully achieved with dynamic extinction ratios of >8 dB. Combining the advantages of the silicon and thin-film lithium niobate platforms, a compact dual polarization coherent modulator is also experimentally demonstrated, on which 96 Gbaud 16-level quadrature amplitude modulation signals in both polarizations are successfully transmitted.

Extinction ratio

Modulation (music)

10.1021/acsphotonics.2c00263

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Citations (37)