bluuebunny/crossref_metadata_2025 huggingface dataset:
Inverse Design of Ultra-compact Shallow-etched Polarization Splitter and Rotator
Authors: Wang Yinghui , Mao Simei , Cheng Lirong , Zhao Caiyue , Fu H. Y.
Published: January 2022

We designed a polarization splitter and rotator via topology optimization. The conversion loss is lower than 1.2 dB at the wavelength range of C-band within 6×2 μm2 footprint.
Reduced Confinement Loss in Tubular Hollow Core Fibers with a Tailored Jacket Tube
Authors: Naghdi Behnam , Wang Lixian , Lin Jiachuan , Bastola Binod , Maes Frederic , Sharma Manish , Jiang Zhiping
Published: January 2022

Tubular hollow core fibers with low attenuation have great potential for different optical applications. Here we numerically investigate designs with a tailored jacket tube showing a significant confinement loss improvement of 27%-66% over a wide band from 1100 to 2000 nm.
Investigation and optimization of sidewall angle impact for thin film lithium niobate grating couplers
Authors: Liu Jiacheng , Du Jiangbing , Qu Minni , He Zuyuan
Published: January 2022

We investigated the impact of the sidewall angle on the performance of a grating coupler on thin film lithium niobate. The optimization is experimentally validated with a grating coupler fabricated by focus ion beam etching.
Ultra-broadband Dual-mode Waveguide Taper Based on an Achromatic Metalens
Authors: Zhong Zhongqiu , Guo Xiaoyuan , Xu Ke
Published: January 2022

An ultra-broadband waveguide taper for TE0 and TE1 modes is designed via achromatic metalenses. The device can operate from 1550 nm to 2150 nm with insertion losses < 1.25 dB and mode purity > 92%.
Design and Simulation of Photonic Crystal Optomechanical Two-Axis Differential Accelerometer
Authors: Wu Jiangbo , Yan Xing , Hu Changjin , Chen Dingwei , Li Jian , Huang Yongjun , Wen Guangjun
Published: January 2022

This paper presents the design and simulation of a new in-plane two-axis differential accelerometer based on the two-dimensional photonic crystal optomechanical cavity structure. The designed accelerometer's theoretical sensitivity can reach 105.6 mg/Hz.
Performance of a Pre-amorphized Traveling-wave Silicon Optical Modulator
Authors: Mishra Darpan , Minz Manoranjan , Sonkar Ramesh Kumar
Published: January 2022

In this paper, a pre-amorphized silicon traveling-wave Mach-Zehnder modulator is compared with a non-pre-amorphized sample and shown to have 1.83 × greater modulation bandwidth with 1.66 × lower energy-per-bit at 1.20 × higher speed for error- free operation.
High optical feedback tolerance of InAs/GaAs quantum dot distributed feedback lasers
Authors: Ding Zhengqing , Yang Zhuohui , Cao Sheng , Yu Ying , Yu Siyuan
Published: January 2022

We investigate the optical feedback sensitivity of GaAs-based quantum dot (QD) distributed-feedback (DFB) diode lasers, which has demonstrated an isolator-free operation under a reflection of up to -16dB. This strong tolerance against the optical feedback suggests the high potential of isolator-free operation in photonic integrated circuits.
Hybrid integration of Lithium niobate on insulator waveguide and AlGaInAs laser
Authors: Dai Shuangxing , Zhao Yiru , Li MingXuan , Sun Liangchen , Jia Qianqian , Han Xueyan , Li Jinye , Zhang Zhike , Liu Jianguo
Published: January 2022

We experimentally demonstrate hybrid integration of lithium niobate on insulator (LNOI) waveguide and AlGaInAs laser by edge-coupling with a coupling loss of 4.8dB. The output power reaches 15mW at 400mA of the packaged device.
Terahertz polarization beam splitter based on cascaded asymmetric directional couplers
Authors: Deng Wentao , Chen Liao , Wu Xiaojun , Zhang Xinliang
Published: January 2022

We demonstrate a terahertz polarization beam splitter based on cascaded asymmetric directional couplers, whose extinction ratios reach up to 20 dB and 32 dB for transverse electric and transverse magnetic modes, respectively.
High-CMRR Balanced Detection Module Based on Complementary Photodetectors
Authors: Tang Yugao , Xiong Bing , Li Zhaozhu , Sun Changzheng , Hao Zhibiao , Wang Jian , Wang Lai , Han Yanjun , Li Hongtao , Luo Yi
Published: January 2022

A balanced photodetector module combined with two complementary photodetectors is proposed and demonstrated. Key factors influencing common-mode rejection ratio are analyzed, and excellent response consistency with CMRR over 30 dB are obtained in DC-18 GHz.
Mode Selection in L40 Photonic Crystal Cavities via Spatially Distributed Pumping
Authors: Wang Lingfang , Cheng Xiaotian , Zhang Xiaodong , Lin Xing , Liu Feng , Jin Chaoyuan
Published: January 2022

By manipulating the spatially modulated gain profile which overlaps with the distribution of vacuum electromagnetic field inside microcavities, we observed single-mode lasing in L40 PhC cavity with an SMSR of 17.48 dB via optical injection.
A hitless and gridless wavelength selective switch for versatile spectral shapings
Authors: He Zhengqian , Tang Zhenzhou , Yu Cui , Li Ang , Pan Shilong
Published: January 2022

A hitless and gridless wavelength selective switch is proposed for versatile spectral shaping, wavelength selective tunable splitting ratio from 100% to 0% and bandwidth tunability from 0.6 ~ 2 nm are obtained by simulation.
1.65 μm Pulsed Fiber Laser Source based on Deuterium- filled Hollow-core Photonic Crystal Fibers
Authors: Pei Wenxi , Li Hao , Wang Meng , Wang Zefeng
Published: January 2022

Here we report an all-fiber tunable 1.65 μm pulsed gas Raman laser source based on deuterium-filled hollow-core photonic crystal fiber. The maximum Raman power of ~1.18 W is obtained, the conversation efficiency is ~20.69 %.
Multimode Wavelength Division Demultiplexing Based on an Angled Multimode Interference Coupler
Authors: Luan Jiapeng , Wang Yi , Zhang Zunyue , Zhang Yaojing , Tsang Hon Ki
Published: January 2022

We designed and experimentally demonstrated an angled multimode interferometer (MMI) for simultaneous wavelength demultiplexing of multiple mode-division multiplexed channels. Wavelength demultiplexing of four-mode channels was experimentally measured.
Silicon-Graphene Heterojunction Waveguide Photodetector with a 3dB-bandwidth of >14 GHz
Authors: Liu Chaoyue , Guo Jingshu , Yu Laiwen , Xiang Yuluan , Dai Daoxin
Published: January 2022

We propose and demonstrate a silicon-graphene heterojunction photodetector with a 100-nm-thick silicon core. The measured 3-dB bandwidth of >14 GHz at 1570 nm and the normalized photocurrent-to-dark-current ratio (NPDR) of 340 mW-1 are obtained.
High-Efficiency Fiber-Chip Edge Coupler Design for Visible Light on Alumina-on-Insulator Photonics
Authors: Du Yuhan , He Yu , Wang Zhen , Zhang Yong , Xie Weiqiang , Su Yikai
Published: January 2022

We propose a fiber-chip edge coupler at the wavelength from 405 nm to 500 nm based on the alumina optical waveguides. Simulation result shows lower than 1.6 dB insertion loss for the TE-polarized light.
Trap Characterization of InGaN/GaN Blue Light Emitting Diode Grown on Si Substrate
Authors: Chen Jiaxiang , Qu Haolan , Qi Longheng , Liu Yaying , Zhang Xu , Lau Kei May , Zou Xinbo
Published: January 2022

Three hole traps and one electron trap were revealed for InGaN/GaN blue LEDs grown on Si by a combination of DLTS and ICTS. Time-resolved thermal-enhanced emission process of deep hole trap was investigated.
An inverse design method with structure transformation technique for designing fabrication-friendly devices
Authors: Chen Yuchen , Qiu Jifang , Dong Zhenli , Guo Hongxiang , Wu Jian
Published: January 2022

Considering device fabrication, we propose an optimization technique to transform structures of inverse-designed devices to be of simpler topologies, and using this technique a 1×3 power splitter with fabrication-friendly structures and better performance is demonstrated.
Tunable Acousto-Optic Filter Based on Suspended Lithium Niobate Waveguides
Authors: Pan Bingcheng , Li Huan , Dai Daoxin
Published: January 2022

Based on suspended lithium niobate waveguides on LNOI platform, a novel tunable acousto-optic filter is proposed, featuring an ultrawide continuous tuning range of 1.2-2 μm, with a fixed bandwidth of ~10-20 nm.
Scalable and Compact Silicon Mode Multiplexer via Tilt Waveguide Junctions with Shallow Etched Slots
Authors: Guo Xiaoyuan , Liu Yingjie , Zhong Zhongqiu , Du Jiangbing , Xu Ke
Published: January 2022

A scalable mode (de)multiplexer is proposed using tilt waveguide junctions with shallow- etched slots. The designed four-mode (de)multiplexer with a 50×2 μm
2
footprint has <0.7 dB insertion loss and < -17.7 dB crosstalk at 1550 nm.
2μm High-speed Large-photocurrent Photodetection Based on the Two-Photon Absorption from a Commercial 1.55-μm Fabry-Perot Laser Diode
Authors: Shi Zhiming , Ji Di , Hu Zhitao , Ye Nan , Pang Fufei , Song Yingxiong
Published: January 2022

With the two-photon absorption enhanced by the internal Fabry-Perot resonator, a 2-μm wavelength 250 MHz sinusoidally-modulated optical signal is detected by a commercial 1.55-μm multi-quantum well laser diode with the photocurrent up to 20.59 μ.
Thermal Analysis and Hybrid Packaging Design of SOI Based All Optical Signal Processing Chip
Authors: Zhai Kunpeng , Jin Ya , Chen Yinfang , Chen Shaokang , Wang Xin , Wen Huashun , Zhu Ninghua
Published: January 2022

The thermal analysis of silicon based all-optical processing chip and a novel packaging structure are reported. We simulated thermal crosstalk between the waveguides, then manufactured packaging structure to make the chip work at room temperature.
A dual-sideband frequency-modulated continuous-wave lidar for simultaneous measurement of velocity and distance
Authors: Su Jingyou , Zhang Yunshan , Zheng Jilin , Guan Shijian , Li Lianyan , Fang Tao , Chen Xiangfei
Published: January 2022

We proposed a dual-sideband frequency-modulated continuous-wave lidar system for simultaneous velocimetry and ranging. When velocity is 0.1m/s and distance is 10m, the measured relative errors of velocity and distance are 0.14% and 2.2% respectively.
A fast cross-correlation method for temperature extraction in BOTDR sensors
Authors: Su Lianghao , Chen Bei , Liu Xiaozhi , Zhou Zhiyan , Song Muping , Wang Yuehai , Yang Jianyi
Published: January 2022

We propose a fast cross-correlation Brillouin frequency shift extraction algorithm for BOTDR sensors to realize temperature detection in real-time. Compared to conventional method, our method has much shorter processing time with comparable accuracy.
A Frequency-Tunable Coupled Optoelectronic Oscillator
Authors: Qi Hefei , Lu Dan , Zhao Lingjuan
Published: January 2022

A low-phase-noise frequency tunable coupled optoelectronic oscillator is demonstrated. Microwave signal tunable from 8 GHz to 21 GHz with signal-sideband phase noise below -123 dBc/Hz at a 10-kHz offset from the carrier frequency is demonstrated.
Simulation of a wideband frequency measurement system using parallel photonic sub-Nyquist sampling and binary deduction
Authors: Sreeraj S J , Singh Karamdeep , Srinivasan Balaji , Christopher S , Venkitesh Deepa
Published: January 2022

A novel photonic sub-Nyquist based wideband frequency measurement system based on a pulsed laser, a set of interleavers and a binary deduction algorithm is proposed and verified with simulations.
Silicon Vestigial Sideband Transmitter for Compensation of Dispersion-Induced Power Fading in IF-over-fiber link
Authors: Liu Fengwei , Zou Xihua , Li Peixuan , Zou Fang , Xie Changjian , Pan Wei
Published: January 2022

A silicon vestigial sideband transmitter consisting of a Mach-Zender modulator and a micro-ring resonator is designed for compensating dispersion-induced power fading in IF-over- fiber mobile fronthaul. It enables a transmission of a 10-Gbaud 16-QAM OFDM signal over 80-km fiber.
Generation of tunable Frequency-doubling Microwave Signals at 2 μm wavelength band
Authors: Ji Di , Hu Zhitao , Sun Lele , Ye Nan , Pang Fufei , Song Yingxiong
Published: January 2022

7~12 GHz tunable frequency-doubling microwave signals are generated at 2 μm using a Mach-Zehnder Modulator and Indium-rich InGaAs photodetector. Higher microwave power can be achieved than the similar setup built at the C-band.
Adam based MIMO equalizer for OAM mode division multiplexed optical fiber communication
Authors: Wang Sihan , Zhou Sitong , Gao Ran , Chang Huan , Xu Qi , Xin Xiangjun
Published: January 2022

we propose an Adam-based equalizer for an orbital angular momentum (OAM) mode-division multiplexed optical fiber communication system, which achieve 1dB and 3dB benefit in two groups compared with stochastic gradient descent(SGD) algorithm.
The Radial Phase Modulation of Concentric Uniform Circular Array to Alleviate the Diffusion of OAM Beams
Authors: Ma Jingcan , Song Xiyao , Yao Yuchen , Zheng Zhennan , Gao Xinlu , Huang Shanguo
Published: January 2022

The radial phase modulation of concentric uniform circular array scheme is proposed to alleviate the diffusion of orbital angular momentum (OAM) beams. Numerical results show that this scheme is effective in reducing the diffusion effect.
High Q silicon micro-ring resonator based on elliptical bending waveguides
Authors: Li Yunlong , Ye Mengyuan , Zhang Weilun , Liu Li
Published: January 2022

By adopting elliptical bending waveguides, a silicon micro-ring resonator with footprint ~ 440 μm and Q factor ~ 6.2×106 is proposed and demonstrated.
A Nonuniform Quantization Scheme based on Optical Phase-shifted Devices
Authors: Hu Feifan , Bi Meihua , Xu Hangyong , Miao Xin , Hu Weisheng
Published: January 2022

We firstly present a nonuniform quantization scheme based on phase-shifted devices used in photonic ADC, which can be used to process the unevenly distributed sampling signals. And, its feasibility is verified by simulation.
Optical Reservoir-based Noise Compensation in a Space Division Multiplexing Transmission System
Authors: Yang Yinke , Wen Feng , Zhao Tianfeng , Yang Feng , Wu Baojian , Qiu Kun
Published: January 2022

We propose a nonlinear-optical loop mirror (NOLM)-based reservoir computing scheme to perform the noise compensation for a space-division multiplexing (SDM) transmission system, achieving the maximum Q
2
of the recovered signal up to 65.52dB.
Measurement of Instantaneous Frequency in Channelized Receiver Based on OFC
Authors: Wang Xin , Fan Daoerji , Gong Caili , Zhang Shilong , Wang Ximin , Miao Yingxi , Wei Yongfeng
Published: January 2022

A novel measurement of instantaneous frequency in channelized receiver based on OFC is proposed and demonstrated. The result shows that the microwave frequencies within dozens of gigahertz can be measured.
Liquid-Crystal-Filled Side-hole Fiber for Temperature Measurement in Fiber ring laser
Authors: Lin Weihao , Shao Liyang
Published: January 2022

A temperature sensor in fiber ring laser (FRL) system has been experimentally demonstrated based on a side hole fiber (SHF) penetrated with liquid crystal (LC). The temperature sensitivity is measured to be −4.23 nm/°C
Research on Reducing Divergence of Vortex beams Based on Generalized Refraction Law
Authors: Yao Yuchen , Ma Jingcan , Song Xiyao , Zheng Zhennan , Gao Xinlu , Huang Shanguo
Published: January 2022

A method is proposed to reduce the divergence angle of vortex beams based on the generalized refraction law. Simulation results show that this method can efficiently weaken the divergence angle of vortex beams.
Constellation Diagram Analyzer Based on Few Shot Learning
Authors: Zhang Hanyu , Zhang Di , Xue Yan Ling
Published: January 2022

A constellation analyzer based on few shot learning is proposed, which can be used for OSNR estimation and modulation format recognition. 100% accuracy is achieved for modulation format recognition and OSNR estimation (except 128QAM).
Estimation of Nonlinear Crosstalk in Weakly Coupled Multi-core Fiber
Authors: Pan Hongfeng , Jin Shulin , Xiang Lian
Published: January 2022

An analytical model of nonlinear inter-core crosstalk in weakly coupled multi-core fiber is derived based on perturbation theory and nonlinear coupled mode equation. The theoretical simulation results agree well with the experimental results.
Monitoring of Flying Horticulture Pest Insects Using a Bi-Static Lidar System
Authors: Huang Jiawen , Chi Jianbin , Wu Qifeng , Svanberg Sune , Li Dunsong , Song Ziwei , Zhu Shiming
Published: January 2022

A CW 980 nm bi-static lidar system based on the Scheimpflug principle and capable of resolving wing-beats was used to monitor flying Conopomorpha sinensis Bradley pest insects in a Lychee fruit orchard in South China.
C-band Seven-core Erbium Doped Fiber Amplifier
Authors: Gu Zhimu , Qiu Qiang , He Le , Chu Yingbo , Dai Nengli , Li Jinyan
Published: January 2022

A seven-core erbium doped fiber amplifier is developed and the gain and noise properties have been studied. The average gain across C-band is 20dB and the noise figure is less than 6dB.
Compact athermal silicon Mach-Zehnder interferometer based on bi-level taper
Authors: Zhao Yingxuan , Huang Haiyang , Qiu Chao , Sheng Zhen , Gan Fuwan
Published: January 2022

We present a novel compact and temperature insensitive Mach-Zehnder interferometer based on bi-level taper and a multimode waveguide. The wavelength thermal dependence of the device is around 15pm/°C in the wavelength range of 50nm.
Build-up Dynamics of Dissipative Solitons in a Nonlinear Polarization Evolution Mode-locked Fiber Laser
Authors: Pan Denghui , Liu Xuanyi , Malomed Boris A. , Fu H. Y. , Li Qian
Published: January 2022

We report the build-up dynamics of dissipative solitons in a net-normal mode-locked fiber laser via time-stretch dispersive Fourier transform technique. In this report, five distinct transient stages are unveiled in the overall build-up process.
Analysis of Neural Network Compensation for Fiber Nonlinearity in Coherent Optical Communication System Based on Perturbation Model
Authors: Xu Tao , Jin Taowei , Jiang Wenshan , Zhang Jing , Yi Xingwen , Qiu Kun
Published: January 2022

We analyze the effect of neural network (NN) on nonlinear compensation in coherent optical transmission system. The simulation and experimental results show that the NN can compensate the residual intra- and inter-channel nonlinear interference.
Fiber optic RI sensor based on a novel Mach-Zehnder interferometer
Authors: Zhang Chuanbiao , Tang Xiongyan , Zhang Min , Shen Shikui , Ning Tigang , Pei Li
Published: January 2022

A novel compact fiber optic sensor fabricated by twin-core fiber (TCF) and multimode fibers (MMF) was proposed and demonstrated. The interference light generated in structures can be used for sensing applications. Through a variety of experiments, we have studied the sensing application of structure, and obtained a good sensing sensitivity.
Low-Complexity Single-Stage Frequency-Domain Equalizer
Authors: Ke Jianhong , Xin Chao , Yang Ting , Liu Cui , Li Chuandong
Published: January 2022

We propose a low-complexity single-stage frequency-domain equalizer (FDEQ) using one adaptive equalizer to compensate both static and dynamic impairments. The proposed approach reduces complexity by 33% without performance degradation.
Research on Channel Compensation Technology of DP-32QAM Optical Communication System Based on DPC-KNN
Authors: Liang Meng , Chu Long
Published: January 2022

We propose a channel compensation technology that combines the density peak clustering (DPC) algorithm and the K-nearest neighbor (KNN) algorithm to reduce the signal damage problem in the polarization multiplexing 32QAM coherent optical communication system.
Experimental demonstration of 160×100Gb/s real-time WDM bidi-transmission over 100-km G.652 fiber
Authors: Yu Wenbo , Shi Hu , Liu Yangguang , Shang Wendong , Jia Yinqiu , Feng Zhenhua
Published: January 2022

We demonstrated a C-band 100-km 16-Tbit/s real-time PDM-QPSK bidi-transmission with the same wavelengths for both directions utilizing 100Gb/s commercial CFP2-DCO coherent modules. Transmission performance of 160-channel duplex system is analyzed with more than 4.5-dB OSINR margin.
A Highly Reliable Timing Error Tolerated Optical Label Demodulation Algorithm for WDM Optical Network Monitoring
Authors: Liu Zhengyu , Yang Tao , Shi Sheping , Du Jinhao , Wang Jiao
Published: January 2022

A timing error tolerated WDM wavelength channel performance monitoring based on optical labels is proposed, verification of the scheme by using a novel asynchronous DPSK-optical-label reception DSP algorithm under serious timing error is successfully demonstrated.
10 Gb/s bidirectional transmission via exploiting optimized integrated EML-SOA based ONU
Authors: Chen Xin Rui , Chu Guang Yong
Published: January 2022

We present the characteristics of optimized SOA and EML, respectively, and combine them for testing their transmission performances, providing a feasible scheme for large-scale deployment of flexible ONU.
Collision Dynamic between Soliton Molecule and Single Soliton
Authors: He Jiangyong , Zhou Mengjie , Liu Congcong , Liu Yange , Yue Yang , Xing Dengke , Zhu Kaiyan , Chang Kun , Wang Zhi
Published: January 2022

For the first time, we used the DFT technology to detect the collision process of single soliton and soliton molecules. Our work reveals the complete dynamic process of elastic collision of single soliton and soliton molecule, especially the soliton molecule disintegrating and the reform of soliton molecule. Numerical simulation shows that gain dynamics is the main physical origin of collision. Our investigations illustrate the particle nature of soliton and supplements the previous research of soliton collision dynamics.
Synchronization of Ultra-stable Radio Frequency Reference over Large-scale Optical Network
Authors: Zhu Jian , Guo Bingli , Zhong Xiangyang , Huang Shanguo
Published: January 2022

In this paper, we proposed the ONSA to satisfy the synchronization requirements of distributed infrastructures over fiber. Simulation results approve that ONSA can provide the ability to support synchronization with the lower phase time delay.
Precoding Methods for FBMC in PON with Intensity Modulation and Heterodyne Detection
Authors: Wang Xiaowu , Yin Mingzhu , Li Zhaohui , Li Fan
Published: January 2022

In this work, various precoding methods to reduce the PAPR of FBMC signal are studied and compared by simulation in terms of PAPR reduction and transmission performance in PON with intensity modulation and heterodyne detection.
NFT-Domain Least Square Channel Estimation Method for Polarization Division Multiplexed NFDM Systems
Authors: Chen Yingrong , Fang Xi , Ding Ding , Xiong Jiaqi , Zhang Lei
Published: January 2022

Nonlinear Fourier transform domain least square channel estimation is proposed for discrete spectrum modulated polarization-division multiplexed nonlinear frequency division multiplexing systems. A lower BER is obtained using the full-loaded training sequences.
Geometric Phase Effect in Optical Fiber Communication Systems with Dynamic Polarization Control
Authors: Zhan Qianxin , Lai Kaiqin , Cai Dajian , Wang Dawei
Published: January 2022

The geometric phase effect in the optical fiber communication systems with dynamic polarization control is analyzed. Both dynamic and geometric phases cause an increase of the signal phase noise, in proportional to the speed of polarization rotation and restoration.
Self-homodyne Transmission of Eigenvalue Communication System Using Polarization-multiplexed Pilot-carrier and Injection Locking
Authors: Chen Junda , Zhang Mingming , Li Weihao , Chen Yizhao , Zhou Ziwen , Tong Tianhao , Zeng Yifan , Cheng Chen , Du Haoze , Liu Deming , Tang Ming
Published: January 2022

A self-homodyne eigenvalue transmission is demonstrated for the first time. With the use of injection locking, the communication maintains available even with distributed feedback laser, achieving a frequency offset tolerance of up to 9 GHz.
A Security-enhanced Physical Layer Encryption Scheme Based on Dispersion Equalization and DNA Encoding
Authors: Kong Wei , Cui Jiabin , Ji Yuefeng
Published: January 2022

A novel security-enhanced physical layer encryption scheme based on dispersion equalization and DNA encoding is proposed. The security of encryption transmission is verified by simulations for 10GBaud 16QAM signals over 300 km fiber.
Cubature Kalman Filter for Compensation of RSOP with Carrier Phase Noise
Authors: Wang Mingxin , Zhang Qi , Gao Ran , Xin Xiangjun , Wang Xishuo , Tian Feng , Liu Bingchun , Chang Huan , Tian Qinghua , Wang Yongjun
Published: January 2022

A Cubature Kalman filter (CKF) is proposed for polarization demultiplexing in a polarization division multiplexing 16QAM system. Simulation results show that CKF has advantages over polarization demultiplexing and OSNR compared to extended Kalman filter.
Optical Beamforming-Based Inter-cell Interference Coordination for Millimeter-Wave Cloud RANs
Authors: Wang Xiaowen , Huang Huan , Zhang Chongfu , Tan Wei , Qiu Kun
Published: January 2022

The low-cost implementation of optical true time delay-based hybrid beamforming is proposed for millimeter-wave cloud radio access networks, where all phase control modules are centrally deployed. Moreover, multi-cell coordinated beamforming is exploited for interference management.
Transfer-Learning Based Convolutional Neural Network for Short-Reach Optical Interconnects
Authors: Liu Xing , Li Jicheng , Fan Zhaoquan , Zhao Jian
Published: January 2022

We propose transfer-learning (TL) aided convolutional neural network (CNN) equalizer for short-reach IM/DD systems. Simulations of PMA4 systems with varying distances and data rates show that TL-aided CNN outperforms TL-aided ANN and CNN without TL.
PAM4 Underwater Optical Communication Enhanced by Holographic Beam Shaping
Authors: Nie Jiewen , Tian Lei , Yang Haining
Published: January 2022

This paper demonstrated a 200 Mbps underwater optical communication based on PAM4 modulation over 25 meters. The performance of the data communication was significantly improved by a holographic optical launching unit that can be reconfigured for different link distances.
Linear and Nonlinear Physical Effects in Optical Fiber Revealed from the Perspective of Deep Neural Networks
Authors: Jiang Xiaotian , Wang Danshi , Zhang Min
Published: January 2022

Deep learning-based forward and backward propagation models of optical pulse in fiber are proposed to characterize both linear and nonlinear physical effects from the perspective of deep neural networks instead of traditional mathematical physics methods.
Transmitter IQ Imbalance Compensation in Single Sideband Direct Detection System with 2x2 MIMO Equalizer
Authors: Wang Wei , Zou Dongdong , Wang Xiaowu , Li Zhaohui , Li Fan
Published: January 2022

The transmission of 150 Gb/s/λ optical single sideband OFDM signal over 80-km SMF is experimentally demonstrated with BER below the HD-FEC threshold. A 2×2 multiple-input multiple-output (MIMO) equalizer is applied for transmitter IQ imbalance compensation.
A Low Self-Noise Fiber Optic Gyroscope Based on Dual-polarization Configuration for Geophysical Rotation Sensing
Authors: Chen Yanjun , Cao Yuwen , Wang Wenbo , He Yan , Zhou Tong , Li Zhengbin
Published: January 2022

A fiber optic gyroscope based on dual-polarization configuration's designed and realized. The 24-hour stability test shows a self-noise level of

3
×

10

−
9

r
a
d
/
s
/

H
z

within the frequency range of 0.001Hz to 1Hz.
Phase Noise Compensation Based on Two-stage Blind Phase Search for Nonlinear Frequency Division Multiplexing with Discrete Spectrum Modulation
Authors: Lv Xiuhua , Bai Chenglin , Xu Hengying , Yang Lishan , Sun Weibin , Yu Xinkuo , Qin Peng , Bi Yanfeng , Tang Xue
Published: January 2022

We propose two-stage BPS scheme to compensate phase noise in single/two-eigenvalue NFDM system for the first time. Compared with feed-forward BPS, it obtains higher laser linewidth tolerance for 16/32QAM signals at OSNR penalties over 1.5dB.
Optical True Time Delay-Based Hybrid Beamforming for Millimeter-Wave NOMA-MIMO Systems
Authors: Liu Sinian , Wang Xiaowen , Huang Huan , Zhang Chongfu , Qiu Kun
Published: January 2022

A low-cost millimeter-wave NOMA-MIMO system by exploiting optical true time delay-based hybrid beamforming is proposed, where only one weight control unit is required. The obtained results show the proposed scheme achieves high spectral efficiency.
Chaotic Constellation Masking Encryption Method for Security-enhanced CO-OFDM/OQAM System
Authors: Xiao Ling , Fang Xi , Jin Jifang , Yu Zifang , Zhou Yang
Published: January 2022

In this paper, we propose a Chaotic Constellation Masking (CCM) encryption method based on henon mapping to enhance the security of CO-OFDM/OQAM system. Simulation results indicate the capability of the CCM method improving system security.
Performance and Complexity Comparison of Different Equalizers in 100-Gb/s PAM-4 Signal Transmission Systems
Authors: Zhou Jiahao , Bai Linchangchun , Liu Qun , Hu Shaohua , Zhu Mingyue , Zhang Jing , Qiu Kun
Published: January 2022

We experimentally investigate and compare the performance and computational complexity of FFE, DFE, VNLE, MLSE and some hybrid algorithms in the 100-Gb/s PAM-4 signal transmission over 2-km or 10-km SSMF system with bandwidth-limited optical transceivers.
Impact of Inter-core Four-wave Mixing on Quantum Key Distribution over Multicore Fiber
Authors: Gao Yaoxian , Sun Yongmei , Cai Chun
Published: January 2022

A theoretical model is built for inter-core four-wave mixing (ICFWM) based on coupled-power theory. Impact of ICFWM on quantum key distribution is evaluated and the power is measured over 11-km 7-core fiber.
On Classification of Linear MIMO Equalizers in Optical Coherent Communications
Authors: Ng Wing Chau , Li Chuandong
Published: January 2022

A four-dimensional DSP-perceived channel is formulated to generalize the existing linear MIMO equalizers into four classes for the first time.
Compact Solid-state Coherent LiDAR based on In-fiber Beam Scanner
Authors: Li Zhi , Liu Bonan , Zang Zihan , Han Yaqi , Wu Lican , Liao Changrui , Fu H. Y.
Published: January 2022

We employ a single-mode fiber to achieve non-mechanical beam-steering in LiDAR system at the first time by adopting a wavelength-swept laser source, which is promising to reduce the cost and the size of LiDAR system.
Design, Fabrication and Measurement of a Novel Ultra Low Crosstalk 7-core-10-mode Fiber
Authors: Shen Lei , Deng Xiaoyue , Chu Jun , Li Yin , Yao Zhao , Li Peng , Yang Liubo , Zhang Lei , Luo Jie , Lan Xiaobo , Lv Hui , Yao Yucheng
Published: January 2022

We report the design, fabrication and measurement of a weakly-coupled 7-core-10-mode fiber. The attenuation of LP01 mode is 0.22dB/km and the crosstalk of the cores are less than -50dB/km. This FM-MCF can be used in weakly-coupled SDM systems that allows to multiply the capacity.
Transmission of 214 Gbps IM/DD PAM-4 over 10 km based on 25 GHz-class EML using low-power nonlinear MLSE
Authors: Li Huanlu , Wang Weiyu , Tang Jian , Zhang Haiyang , Huang Zhilei , Zhou Qinyu , Wang Guoxi , Li Ming , Lu Yuchun
Published: January 2022

214 Gbps per lane PAM-4 transmissions are demonstrated with 25 GHz class commercial EML. Employing an improved MLSE algorithm enables the system to meet 10 km transmission with under KP4-FEC BER threshold requirement. The experiment results show the potential of commercial EML for 800 GbE application.
Experimental Demonstration of 50-Gb/s/Z O-band CWDM Direct-Detection Transmission over 100-km SMF
Authors: Hong Yang , Taengnoi Natsupa , Bottrill Kyle R. H. , Thipparapu Naresh K. , Wang Yu , Sahu Jayanta K. , Richardson David J. , Petropoulos Periklis
Published: January 2022

We demonstrate the first single-sideband 50-Gb/sA coarse WDM direct-detection transmission in the O-band. It is shown that the Kramers-Kronig-detection assisted single-sideband transmission exhibits significant OSNR sensitivity improvements over double-sideband transmission, enabling up to 100-km reach.
O-band P-doped InAs/GaAs quantum dot lasers directly grown on SOI substrate
Authors: Huang Jing-Zhi , wei Wen-Qi , Chen Jia-Jian , Wang Zi-Hao , Wang Ting , Zhang Jian-Jun
Published: January 2022

This work demonstrated the first electrically pumped ground-state InAs QD narrow ridge lasers emission at 1310 nm (O-band) epitaxially grown on standard SOI substrate with continuous-wave (CW) current injection at room temperature.
High-accuracy Small Target Recognition with Photonics-Based Radar HRRP
Authors: Li Jinhu , Zhang Fangzheng , Pan Shilong , Gao Bindong , Sun Guanqun
Published: January 2022

Small target recognition using high resolution range profiles (HRRP) of an 8-GHz bandwidth photonics-based radar is demonstrated. Applying convolutional neural networks for feature extraction and classification, the recognition accuracy reaches as high as 97.16%.
Highly reliable and high speed InGaAs PIN photodetector on Si by heteroepitaxy
Authors: Song Bowen , Shi Bei , Zhu Si , Brunelli Simone Šuran , Klamkin Jonathan
Published: January 2022

InGaAs photodiodes were realized on Si by heteroepitaxy, demonstrating the dark current density of 0.45 mA/cm2, responsivity of 0.7 A/W, bandwidth of 11.2 GHz and 17 years equivalent room-temperature operation.
Heterogeneous O-Band InAs/GaAs Quantum-Dot Optical Amplifier on Silicon
Authors: Descos Antoine , Kurczveil Geza , Liang Di , Beausoleil Raymond
Published: January 2022

We demonstrate a heterogeneous QD/silicon O Band SOAs with gain over 15 dB and noise figure around 7 dB on a platform supporting DFBs, high speed modulators and no impact on high-speed signal integrity up to 32.1 Gbps..
Different Electrodes Partial Discharge Detections via Fluorescent Fiber
Authors: Guo Qiang , Xie Feiyang , Huang Xiaoqi , Zhang Changfeng , Li Mao , Yan Yuheng , Wang Taiqi , Zheng Luchuan
Published: January 2022

Fluorescent fiber is used for Partial Discharge (PD) with different electrodes. The PD signal is linearly correlated with transient discharge current. Experimental results show the shape of the electrode affects the intensity of PD signal.
Visible Light Communication Channel Modeling by Experiment-Data-Driven Deep Learning
Authors: Zhu Yanwen , Han Dahai , Yang Chuan , Li Shengnan , Li Xiaoyun , Zhang Min
Published: January 2022

An experiment-data-driven channel-modeling method based on bidirectional long short-term memory is proposed for visible light communication channels. The resulting mean absolute error is stable in a small range, reaching 0.009 without occupying spectrum resources.
A 3D Visible Light Positioning and Orienteering Scheme Using Two LEDs and a Pair of Photo-detectors
Authors: Yang Xiaobai , Jiang Zile , You Xiaodi , Chen Jian , Yu Changyuan , Li Yongcheng , Gao Mingyi , Shen Gangxiang
Published: January 2022

A 3D visible light positioning (VLP) scheme is proposed by referring to the distances between two luminaires and a pair of photo-detectors. VLP accuracy < 10 cm can be achieved while offering terminal orientation information.
Experiment of Extended Segment Routing Enabled Fast End-to-End Service Provisioning in Multi-Domain for the Fifth Generation Fixed Network (F5G)
Authors: Li Xin , Zhao Yongli , Li Zhuotong , Li Yajie , Li Hao , Xie Gang , Lin Yi , Zhang Jie
Published: January 2022

We propose an extended segment routing-based wisdom automatic service provisioning (SR-WASP) in multi-domain for F5G. Results show that SR-WASP can significantly reduce the blocking probability and the latency of lightpath construction.
Self-Oscillating Broadband Optical Frequency Comb Generation Using an EML-Based Optoelectronic Oscillator and a Recirculating Frequency Shifter
Authors: Zhao Quanjing , Yan Juanjuan
Published: January 2022

A self-oscillating optical frequency comb (OFC) generator is designed and experimentally demonstrated using an electro-absorption modulated laser based optoelectronic oscillator and a recirculating frequency shifter. A 10-GHz 38-tone OFC is generated with a 1.2-dB flatness.
Calibration-Free 2 x2 Mach-Zehnder Switches with Ultralow-Loss MMI Couplers
Authors: Song Lijia , Liu Hongxuan , Peng Yingying , Li Huan , Shi Yaocheng , Dai Daoxin
Published: January 2022

Calibration-free 2 × 2 Mach-Zehnder switches have been proposed and experimentally demonstrated with ultralow-loss multimode interference couplers with multi-segment multimode section.
Tunable Dispersion Compensator Based on Taper Bragg Gratings with Heating-Engineering
Authors: Liu Shujun , He Jianghao , Dai Daoxin
Published: January 2022

A tunable dispersion compensator on silicon is proposed and demonstrated by using taper Bragg gratings with engineered heating. The dispersion tuning range is about 5-15 ps/nm in theory.
A High Slope Efficiency Ring-cavity Single-frequency Fiber Laser Based on Yb: YAG Crystal-derived Silica Fiber
Authors: Wan Ying , Wen Jianxiang , Zou Kai , Jiang Chen , Pang Fufei , Wang Tingyun
Published: January 2022

A high-concentration Yb-doped YAG crystal-derived silica fiber (YCDSF) is fabricated using the melt-in-tube method. Based on this fiber, a ring-cavity single-frequency fiber laser (SFFL) has been accomplished, and its slope efficiency is up to 21.7%.
Transverse Mode Fiber Laser Based on Few-Mode Polarization-Maintaining Fiber Long-Period Grating
Authors: Jiang Chen , Liu Yunqi , Ma Yuehui , Wan Ying , Huang Zinan , Mou Chengbo
Published: January 2022

We fabricate a few-mode polarization-maintaining long-period grating using CO2-laser. A transverse mode fiber laser based on this grating has been proposed and demonstrated experimentally.
A Photon Limited SiPM Based Receiver for Internet of Things
Authors: Li Yangchun , Hua Yuanyuan , Henderson Robert K , Chitnis Danial
Published: January 2022

We compared two photons counting readout methods on a SiPM based receiver. The results show that integration method performs better BER in non-linear counts and 1Mbps is achieved under 9.44M0-9W with 11.78 photons per bit.
Observing cross-channel NLI generation in disaggregated optical line systems
Authors: London Elliot , Virgillito Emanuele , D’Amico Andrea , Napoli Antonio , Curri Vittorio
Published: January 2022

We investigate spatially separated XPM generation in a wide variety of 400G-ZR+ 64GBd pump-and-probe simulations, demonstrating the existence of a per-span upper bound that depends solely upon accumulated dispersion.
Ultrahigh resolution narrow linewidth measurement based on Brillouin laser in a high Q Whispering gallery mode cavity
Authors: Geng Yong , Liu Boyuan , Zhang Qiang , Han Xinjie , Qiu Kun , Zhou Heng
Published: January 2022

We demonstrate ultrahigh resolution narrow linewidth measurement based on Brillouin laser in a high Q Whispering gallery mode cavity. This new scheme can achieve a higher spectral resolution and overcome the main drawbacks of conventional schemes.
Broadband noise suppression in self-injection locked fiber laser with a high-Q optical microresonator
Authors: Wang Xiaoying , Liu Tuo , Guo Hairun
Published: January 2022

We develop MgF2 high-Q crystalline microresonators (Q~108) and implement laser self-injection locking for an erbium-doped fiber laser in the continuous mode. The locked laser linewidth is 100s kHz, and the broadband spontaneous emission is suppressed.
Demonstration of Two-Section High-Power 1.27-μm DFB Lasers with High Single Mode Yield for Photonic Integration
Authors: Xiang Minwen , Ma Xiang , Zhang Yuanhao , Zhang Gong , Lu Qiaoyin , Lu MingZhi , Guo WeiHua
Published: January 2022

We experimentally demonstrated two-section high power 1.27-μm single-mode DFB lasers with high single-mode yield for photonic-integration. The fabricated laser exhibited a stable single-mode operation with the output power above 70-mW and slope efficiency over 0.42-mW/mA.
Photonics-based reconfigurable chirp signal generation with controllable amplitude, phase, and frequency
Authors: Du Wenhao , Zhu Dan , Pan Shilong
Published: January 2022

A photonics-based reconfigurable chirp signal generation scheme using optical frequency combs (OFCs) with controllable amplitude, phase, and frequency is proposed. The center frequency, bandwidth, and the time duration can also be adjusted flexibly.
Twist Sensor Based on Long-Period Grating Mach-Zehnder Interferometer at 2-μm Waveband
Authors: Liao Dandan , Jiang Chen , Lu Kangkang , Liu Yunqi
Published: January 2022

We demonstrate the fabrication of Mach-Zehnder interferometer twist sensor based on the cascaded long-period fiber gratings operating at 2-μm waveband. The torsion sensitivities of wavelength and intensity are 0.333 nm/(rad/m) and -1.095 dB/(rad/m), respectively.
SSBI-Oriented MISO Equalizer in the Presence of O/E Front-end Frequency Response
Authors: Wu Qi , Zhu Yixiao , Yin Longjie , Hu Weisheng
Published: January 2022

A customized algorithm is proposed to adaptively mitigate ISI and SSBI considering O/E front-end response simultaneously based on a MISO equalizer in SSB direct detection system, and validated in 30GBaud SSB-32QAM 80km SSMF transmission experiment.
Fast WHT-based Block Precoding for DMT Transmission
Authors: Wang Ling , Chen Ming , Chen Gang , Deng Aitao , Zhou Hui , Liu Yi , Cheng Yun
Published: January 2022

We experimentally compare DFT, OCT and WHT-based block precoding (BP), bit loading and the traditional precoding techniques in a short-reach DMT system. A similar BER performance can be achieved with the low-complexity fast WHT-based BP technique.
Precoding-enabled Probabilistically-shaped DMT Transmission with Average Signal Power Constraint
Authors: Long Haimiao , Chen Ming , Zhang Long , Chen Gang , Wang Ling , Liu Yi , Cheng Yun
Published: January 2022

We experimentally investigate the PS-DMT system enabled by DFT, OCT and WHT-based precoding techniques under average transmit signal power constraint. Up to 2 dB receiver sensitivity improvement can be achieved compared to the conventional PS-DMT.
Flat Optical Comb Generation Using LNOI-based Dual-parallel Mach-Zehnder Modulator
Authors: Xu Mengyue , Zhu Yuntao , Yu Siyuan , Cai Xinlun
Published: January 2022

Flat optical frequency comb with 5 lines, 30 GHz spacing and 0.7 dB flatness is generated by an integrated LN dual-parallel Mach-Zehnder modulator. The device features a 1.2-V driving voltage and broad bandwidth.
Ultra-broadband and Efficient Edge-Coupler on LNOI Platform
Authors: Liu Xiaoyue , Pan Ying , Cai Xinlun
Published: January 2022

We demonstrate an ultra-broadband and efficient edge-coupler on LNOI platform operating at near-visible to near-infrared bands with coupling loss < 3.5 dB/facet, which contributes to efficient nonlinear frequency conversion.
Creating Spatial States of Light for Quantum Information with Photonic Lanterns
Authors: Alarcón A. , Argillander J. , Xavier G. B.
Published: January 2022

We demonstrate an all-fiber platform for the generation and detection of spatial photonic states where combinations of LP01, LP11
a
and LP11
b
modes are used. This scheme can be employed for quantum communication applications.
Tunable multiple Fano resonances based on a plasmonic metal-insulator-metal structure for nano-sensing and plasma blood sensing applications
Authors: Rohimah Siti , Tian He , Wang Jinfang , Chen Jianfeng , Li Jina , Liu Xing , Cui Jingang , Hao Yu
Published: January 2022

A base plasmonic metal-insulator-metal (MIM) waveguide structure consisting of a baffle waveguide and an obround-shaped resonator is designed to produce Fano resonance. The simulation results exhibit that double Fano resonances can be achieved. Based on this structure, an inner obround-shaped resonator is spliced to the former obround-shaped resonator through a slot resonator to form the expanded structure. Then quadruple Fano resonances are produced by the interference between the broadband continuous state arising from the baffle waveguide and the narrowband discrete state arising from the interaction among the inner obround-shaped resonator, the outer obround-shaped resonator, and the slot resonator. The Fano resonance and refractive index sensing characteristics are investigated, and the sensitivity and the figure of merit can reach 1636 nm/RIU and 33562, respectively. Furthermore, the structure filled with blood plasma can be used for detecting plasma concentrations with different refractive indices, and the sensitivity can reach

2.88

n
m
⋅
L

/

g

. The proposed structure with the simple baffle waveguide and obround-shaped resonators may have potential applications in biosensing and nanoscale optical sensing.
Sub-2-Cycle Carrier-Envelope-Phase‒stabilized 110W, 1.1mJ Laser
Authors: Hädrich Steffen , Tschernajew Maxim , Shestaev Evgeny , Stutzki Fabian , Walther Nico , Just Florian , Karl Florian , Herrfurth Oliver , Seres Imre , Jójárt Péter , Várallyay Zoltán , Börzsönyi Adám , Müller Michael , Grebing Christian , Hoff Dominik , Eidam Tino , Limpert Jens
Published: January 2022

We present a sub-2 cycle laser system combining high average power,
pulse energy and repetition rate with CEP-stable operation making this
system an ideal driver for next-generation attosecond sources. The
system is based on a fiber-chirped pulse amplification system
incorporating coherent combination of 8 amplifier channels. The latter
emits 300fs pulses, which are post-compressed down to the few-cycle
regime in a two-stage multi-pass cell (MPC) nonlinear pulse
compression. The first multi-pass cell is based on standard dielectric
mirrors and achieves 1.7mJ, <35 fs pulses. The second MPC utilizes
metal-based mirrors allowing to achieve a pulse duration of 5.8fs at a
pulse energy of 1.1mJ, which corresponds to the shortest pulses and
highest compressed average power for few-cycle MPCs with 110W at the
used 100kHz pulse repetition rate. The stabilization of the
carrier-to-envelope phase is presented.
Visible to Mid-infrared Supercontinuum Generation in a Gas Fiber Raman Laser
Authors: Gladyshev A.V. , Pritulenko I.G. , Yatsenko Yu.P. , Kolyadin A.N. , Bufetov I.A.
Published: January 2022

A multiband supercontinuum with spectral coverage from 0.65 to 3.3 μm
is demonstrated in D2-filled revolver-type hollow-core
fiber. About 15 % of pump quanta were converted to wavelengths above 2
μm.
Czochralski growth and laser operation of Er- and Yb-doped mixed sesquioxide crystals
Authors: Hülshoff Lena , Uvarova Anastasia , Guguschev Christo , Kalusniak Sascha , Tanaka Hiroki , Klimm Detlef , Kränkel Christian
Published: January 2022

We report on the Czochralski growth, spectroscopy, and laser operation
of Er- and Yb-doped mixed sesquioxide crystals. Er(7
at.%):(Y,Sc)2O3 enables 19% slope efficiency at
2.7 µm, Yb(0.4 at.%):(Y,Sc)2O3 yields 87% at
1.04 µm.
LYSB and Yb-doped LYSB Crystals: Czochralski Growth, Optical Characterization and Laser Emission Performances
Authors: Broasca Alin , Greculeasa Madalin , Voicu Flavius , Stanciu George , Hau Stefania , Gheorghe Cristina , Croitoru Gabriela , Pavel Nicolaie , Gheorghe Lucian
Published: January 2022

Incongruent melting pure and Yb-doped La
x
Y
y
Sc4-x-y(BO3)4 - LYSB crystals were
successfully grown by the Czochralski method. Their structural, linear
and nonlinear optical properties are investigated. The laser emission
characteristics of the Yb-doped crystal are reported.
High-Resolution Mapping of Phase Matching in Nonlinear Crystals
Authors: Dorrer C. , Begishev I. A. , Bahk S.-W. , Bromage J.
Published: January 2022

The phase-matching conditions for second-harmonic generation are
precisely mapped in nonlinear crystals by spatial scanning of a
stabilized probe beam for application to large-aperture crystals used
in frequency conversion and parametric amplification.
Third-Harmonic Generation at 1594 nm in a KTP Ridge Optical Waveguide
Authors: Vernay Augustin , Boutou Véronique , Félix Corinne , Jegouso David , Debray Jérôme , Pairis Sébastien , Bassignot Florent , Chauvet Mathieu , Boulanger Benoît
Published: January 2022

We achieved birefringence phase-matched Third-Harmonic Generation at
1594 nm in a KTiOPO4 single crystal ridge optical
waveguide. The energy conversion efficiency reached 3.4% for a pump
energy as low as 2 µJ over a pulse duration of 15 ps. Strong
agreements between theory and experiments for phase-matching and
conversion efficiency were obtained.
Femtosecond Laser Written Tm3+:BaY2F8 Waveguide Laser Operating Near 1.9 µm
Authors: Morova Yagiz , Tonelli Mauro , Sennaroglu Alphan
Published: January 2022

We report the first experimental demonstration of continuous-wave laser
action near 1.9 µm in a femtosecond laser written Tm3+
ion-doped BaY2F8 crystal waveguide laser with
incident lasing threshold pump power as low as 23 mW.