bluuebunny/crossref_metadata_2025 huggingface dataset:
SRS suppression in high-power fiber amplifier with LPFGs
Authors: Hu Qihao , Tian Xin , Wang Meng , Wang Zefeng , Xu Xiaojun
Published: February 2021

We report here, for the first time, the effective suppression of stimulated Raman scattering in a 5 kW fiber amplifier using a long-period fiber gratings fabricated by CO2 laser.
Improved fluorine doped graded index multimode optical fiber with enhanced ultraviolet transmission
Authors: Dajuan Lyu , Wei Zheng , Fei Guo , Liangming Xiong , Song Wang , Ben Zhang Xin , Minghong Yang
Published: February 2021

An improved fluorine doped graded index multimode optical fiber 55 meters long is reported with high ultraviolet light transmittance up to 43.9% at 351 nm wavelength, which ensures the laser pulse waveform not be distorted.
Hemoglobin Detection Based on Excessively Tilted Fiber Grating by Non-covalent bonding
Authors: Sun Yuezhen , Lu Tean , Wang Hushan , Sun Qizhen , Yan Zhijun , Liu. Deming
Published: February 2021

We have demonstrated a novel hemoglobin sensor based on hydroxide bond functionalized excessively tilted fiber grating. Due to non-covalent bonding between hydroxide bond and hemoglobin, such sensor could achieve hemoglobin detection with sensitivity around 1.93nm/(mg/ml).
Field Test of Broadband Fiber Optic Interferometric Seismometer
Authors: Zhang Wentao , Huang Wenzhu , Wang Yibo , Yao Yi , Zhang Jianxiang , Lv Bing , Li Fang
Published: February 2021

This paper proposed a broadband fiber optic interferometric seismometer. Field test shows a broad frequency band of 0.1 Hz - 500 Hz with noise level better than 10 ng/√Hz @ 10 Hz.
BOTDR-based Optical Distributed Ice-coating Identification Technology on Transmission Line
Authors: Sun Jinxiang , Zhou Wenting , Zhang Zhiguo , Chen Shuo , Sun Shaohua , Yang Linhui , Wang Xin
Published: February 2021

An OPGW ice-coating monitoring scheme based on BOTDR temperature measurement is proposed and demonstrated. The scheme is applied to actual transmission line. The temperature measurement accuracy is about ±1℃.
Kilowatt laser-induced thermal damage in high-purity silica fiber by pulsed laser at 1064 nm
Authors: Zhang Haoyu , Hu Yingshi , Sun Shihao , Jia Baonan , Gao Yongpan , Lu Pengfei
Published: February 2021

By using the finite element method, kilowatt laser-induced thermal damage is investigated in the model of high-purity silica fiber. Fiber loss, thermal absorption and melting damage are studied by the simulation calculation.
Design of Wideband Top Ground MSL for Back-incidence High-speed Photodetector Packaging
Authors: Chen Jih-Chin , Xiong Bing , Chao Enfei , Sun Changzheng , Hao Zhibiao , Wang Jian , Wang Lai , Han Yanjun , Li Hongtao , Luo Yi
Published: February 2021

Top-ground microstrip line (TGMSL) is designed for high-speed photodetector package. The fabricated TGMSL exhibits a transmission loss below 0.5 dB and a reflection coefficient less than −15 dB up to 40 GHz.
Fiber-optical wind speed sensing system
Authors: Zhou Rui , Sun Shaohua , Yang Linhui , Liu Shengcheng , Zhang Zhiguo
Published: February 2021

We experimentally demonstrated a real-time wind speed monitoring methord by utilizing fiber-optic sensors to acquire and display the value on the computer.
Beyond 200G Single Sideband Transmission over 80km with a Silicon IQ Modulator
Authors: Zhang Lei , Ruan Xiaoke , Yang Fan , Chen Xinyu , Li Yanping , Zhang Fan
Published: February 2021

We experimentally demonstrate ultra-high speed metro-scale optical transmission of SSB PAM-4 signal with a record single lane bit rate of 204Gb/s over 80km SSMF based on a silicon IQ modulator with two-parallel Mach-Zehnder structure.
Sub-Sampling Generation and Transmission of 205Gbaud OOK Signal with 120GSa/s DAC Based on High-Order Partial Response Narrowing
Authors: Zhu Yixiao , Zhang Lei , Fang Xiansong , Zhang Fan , Hu Weisheng
Published: February 2021

With 120GSa/s DAC, up to 205Gbaud OOK signal is generated and transmitted over 500m SSMF below 20% HD-FEC threshold of 1.5×10-2. Sub-sampling rate of 0.585 is achieved by partial response narrowing and digital anti-aliasing filter.
Centralized Control and Core Function Prepositioning for Point-to-Point Service Slicing in Multidimensional Large-Scale Optical Networks
Authors: Li Xin , Guo Bingli , Wang Dajiang , Wang Jiayu , Cheng Wulin , Zhong Xiangyang , Li Qian , Huang Shanguo
Published: February 2021

A framework of centralized control and core function prepositioning is proposed. The functions of fast connection establishment, disaster-resilient survivability, etc., are deployed in advance. This framework supports the point-to-point service slicing in 5G era.
Observation of nonlinear topological corner states
Authors: Kruk Sergey , Gao Wenlong , Choi Duk Yong , Zentgraf Thomas , Zhang Shuang , Kivshar Yuri
Published: February 2021

We bring the physics of topological corner states to the nanoscale. We study experimentally topology-driven nonlinear effects generated by subwavelength edge and corner topological states in optical valley-Hall dielectric metasurfaces.
Carrier-Suppressed Modified Duobinary PAM-4 Signal for Short Reach Transmission
Authors: Chen Xi , Feng Da , Li Longsheng , Hu Weisheng
Published: February 2021

We propose and experimentally demonstrate a carrier suppressed MDB PAM-4 signal for short-reach IM/DD system without dispersion compensation. The BER result of Volterra-DFE is better than FFE and both can reach the SD-FEC threshold.
Phase Recovery in Probabilistically-Shaped Optical Communication Systems
Authors: Zhao Jian
Published: February 2021

We propose a novel phase recovery method based on Kullback-Leibler divergence. Simulations and experiments show that it exhibits better performance than Kalman filtering, PCA and PCA+BPS, and lower complexity than 2-stage BPS for PS formats.
On-Chip Polarimeter for Stokes Parameters Detection
Authors: Zhou Changyu , Lei Ting , Yuan Xiaocong
Published: February 2021

We design an on-chip polarimeter using the silicon nanodisk based elements enabled by spin-orbit interactions. We also demonstrate the polarimetry for Stokes parameters detection by separating and measuring the polarization components of the incident light.
Ultra-High-Capacity Indoor Wireless Communication enabled by Photonic Technologies
Authors: Koonen Ton
Published: February 2021

Energy-efficient wireless communication at high speed and high user density is greatly supported by 2D steered beams, i.c. mm-wave radio beams and ultimately narrow IR optical beams. Optical techniques can simplify accurate 2D beam steering, in conjunction with user localization and wide FoV broadband receivers.
Chaos-assisted two-octave-spanning microcombs
Authors: Chen Hao-Jing , Yi Xu , Xiao Yun-Feng
Published: February 2021

We demonstrate on-record spectral span microcombs (450-2000 nm) in an asymmetric optical microcavity. The two-octave-span intracavity emission is harnessed to a nanowaveguide through the chaos-assisted broadband coupling.
Counting high-rate microresonator solitons with Vernier frequency division
Authors: Wang Beichen , Yang Zijiao , Zhang Xiaobao , Yi Xu
Published: February 2021

A dual-comb Vernier frequency division method is demonstrated to detect sub-THz microresonator soliton rep-rate. The required electrical bandwidth for rep-rate detection is vastly reduced, and we stabilized 200 GHz rep-rate to a 1 GHz reference.
Stokes vector direct detection using a spin-dependent grating
Authors: Xie Youpeng , Lei Ting , Ye Huangbin , Chen Yanjun , Wang Dawei , Dai Yanmeng , Du Luping , Li Zhaohui , Yuan Xiaocong
Published: February 2021

We demonstrate a spin-dependent liquid crystal grating to detect the polarization states of light. We achieved Stokes vector direct detection of QPSK, 8PSK and 16QAM signals with 16G, 8G and 4G baud data rates.
High-baud Rate Silicon Photonics for Short-reach Transmission
Authors: Zhang Fan , Ruan Xiaoke , Yang Fan , Zhang Lei , Ming Hao , Li Yanping
Published: February 2021

We review high baud rate operation of Silicon photonic modulators and receivers with emphasize on short-reach applications. The current status of both devices and digital signal processing are discussed.
Versatile Mode-locking Fiber Laser Based on Hybrid Graphene Microfiber Knot Resonator Device
Authors: Ding Zi-xuan , Xu Fei
Published: February 2021

We demonstrate a stable mode-locked all-fiber laser based on the hybrid graphene microfiber knot resonator device. Soliton, harmonic and high-repetition-rate mode-locking pulsation output with picosecond pulse-width at 1550 nm were achieved.
Ultra-Compact Silicon Multimode Waveguide Bends with Shallow-Etched Grooves
Authors: Gao Sai , Wang Hongwei , Yi Xiaogen , Qiu Ciyuan
Published: February 2021

A novel design for ultra-compact multi-mode waveguide bend is proposed, which enables the first four TE mode-channels with an ultra-small bending radius of 5.6 μm. And a specific design example is given and fabricated.
Soliton microcomb generation by manual microheater tuning
Authors: Yang Bofan , Xue Xiaoxiao , Li Shangyuan , Yu Xianbin , Wang Jian , Zheng Xiaoping
Published: February 2021

Accessing thermally stable solitons in microresonators generally requires complex laser tuning with a carefully selected speed. Here, we demonstrate a simplified method by manual microheater tuning with the aid of an auxiliary laser.
Mech-Zehnder switch with low random phase errors
Authors: Song Lijia , Dai Daoxin
Published: February 2021

A Mech-Zehnder switch (MZS) with very low random phase errors is proposed and demonstrated for the first time by introducing broadened arm waveguides. The fabricated thermo-optic MZS shows high an extinction ratio of >35 dB at the central wavelength.
Opto-plasmonic microfluidic sensor for molecular detection
Authors: Yu Xiao-Chong , Tang Shui-Jing , Xiao Yun-Feng
Published: February 2021

We apply a microfluidic integratable liquid core microbubble resonator for sensitive and cost-efficient aqueous detection. With the aid of plasmonic enhancement, monitoring the dynamics of the single strand DNA molecules is realized.
Sodium-based plasmonic nanolaser with a record-low threshold at near-infrared
Authors: Mao Yi-Fei , Ma Ren-Min
Published: February 2021

Plasmonic nanolasers are a new class of laser devices which amplify surface plasmons instead of photons by stimulated emission. Here we demonstrate a room temperature sodium-based plasmonic nanolaser with a record low threshold of 140 kW/cm2 at near-infrared.
Probabilistic Shaping based Superposed Coded Modulation in Single Receiver Multiple-Input-Multiple-Output Visible Light Communication System
Authors: Zou Peng , Li Guoqiang , Hu Fangchen , Chi Nan
Published: February 2021

We proposed two novel probabilistic shaped superposed coded modulation schemes, which are superior to the conventional space-time-block-code. The PAM4 based scheme outperforms that of QPSK based scheme and 1.70 Gbps achievable information rate is achieved.
Location-Aware Time Domain Hybrid Modulation for Mobile Visible Light Communication
Authors: You Xiaodi , Liu Zhongxu , Chen Jian , Gao Mingyi , Yu Changyuan , Shen Gangxiang
Published: February 2021

A location-aware time domain hybrid modulation (TDHM) scheme is proposed for mobile visible light communication. TDHM frames are constructed according to location information, which can increase capacity more than 20% for around 20% indoor areas.
Transmission Performance Evaluation Throughout the Life Cycle of Lightpath in Intelligent Optical Networks
Authors: Zhuge Qunbi , Liu Yichen , Liu Xiaomin , Lun Huazhi , Cai Meng , Yi Lilin , Hu Weisheng
Published: February 2021

To ensure reliable control and management throughout the life cycle of lightpath, evaluating the quality of transmission (QoT) including various physical layer impairments is essential. We review our progress on the modeling and monitoring of optical link impairments.
Photonic Integrated Circuits with Bound States in the Continuum: Principle and Applications
Authors: Sun Xiankai
Published: February 2021

We experimentally demonstrated bound states in the continuum in photonic integrated circuits, with which we further realized acousto-optic modulation, frequency shifting, high-dimensional communication, and hybrid 2D-material photonics on an etchless lithium niobate integrated platform.
Low Vπ silicon-based x-cut thin-film lithium niobate MZ modulators fabricated by photolithography
Authors: Li Heng , Liu Ye , Liu Jia , Tan Su , Lu Qiaoyin , Lu Mingzhi , Guo Weihua
Published: February 2021

We calculated Vπ and light loss for different electrode gap and waveguide depth for x-cut TFLN modulators. Then we fabricated modulators which have shown the lowest VπL among similar modulators as far as we know.
On-chip nanophotonic devices based on intelligent algorithm
Authors: Lu Cuicui
Published: February 2021

On-chip integrated wavelength routers, polarization routers and cascaded filter and routers are successfully designed and experimentally demonstrated based on the intelligent algorithm by combining genetic algorithm, simulated annealing algorithm, topology optimization, and finite element method.
Lossy Mode Resonance Excitation in Fiber-Optics: Applications in Biosensing
Authors: Chiavaioli Francesco , Baldini Francesco , Giannetti Ambra , Del Villar Ignacio , Zubiate Pablo , Santano Desiree , Urrutia Aitor , Zamarreño Carlos R. , Díaz Silvia , Arregui Francisco J. , Matias Ignacio R.
Published: February 2021

The excitation of lossy mode resonance (LMR) in guided-wave optics is explored. Side-polished fibers underpin the LMR phenomenon with outstanding performance in biosensing applications. Limit of detection of the order of femtomolar has been demonstrated.
Plasmonic Optical Fiber Grating Aptasensing
Authors: Caucheteur Christophe , Loyez Médéric , Lobry Maxime , Wattiez Ruddy
Published: February 2021

We report bioassays with gold-coated tilted fiber Bragg gratings functionalized with aptamers for both proteins and cells sensing. Our work is focused towards the measurement of relevant cancer biomarkers.
Noise Mitigation Using Adaptive Filtering Algorithm for Long-Range VLC System Based on FPGA
Authors: Wang Xiaozheng , Zhang Minglun , Ren Xiaomin
Published: February 2021

We design and implement an adaptive filter using FPGA for real-measured ambient noise mitigation in a 100m outdoor visible light communication system. Experimental results indicate that 7.84 dB SNR improvement is achieved.
Demonstration of Real-time Optical Labelling System for Coherent Optical Wavelength Division Multiplexing Networks
Authors: Yang Chao , Luo Ming , Zhang Xu , Meng Lingheng , Luan Yancai , Mei Liang , He Zhixue
Published: February 2021

We experimentally demonstrate a real-time optical labelling system in coherent optical WDM network. The scheme is based on subcarrier index modulation technology with 100-Gb/s DPQPSK signal in practical network scenarios.
A 3-Stage Equalizer to receive the Burst Frame of the Coherent PON with the Free Running 2 Times Over-Sampling Clock
Authors: Zeng Tao , He Zhixue , Meng Linheng , Jiang Feng , Li Jie , Yu Shaohua
Published: February 2021

This paper proposes a 3-stage equalizer, which is suitable to receive the burst frame in the upstream traffic of the coherent PON, with the free running 2 times over-sampling clock. We verify this technique in experiment.
Investigation on the Impact of Additional Connections to Feedforward Neural Networks for Equalization in PAM4 Short-Reach Direct Detection Links
Authors: Xu Zhaopeng , Sun Chuanbowen , Ji Tonghui , Dong Shuangyu , Zhou Xian , Shieh William
Published: February 2021

Different additional connections onto feedforward neural networks are investigated for equalization in a 50-Gb/s PAM4 short-reach direct detection link. The auto-regressive and cascade structures demonstrate the most significant performance improvement with limited additional computational complexity.
6.8 Gbit/s LED-based Pure Silica Fiber Link Using Five-Primary-Color LED and Probabilistically Shaped DMT Modulation
Authors: Hu Fangchen , Wang Chaofan , Li Guoqiang , Zou Peng , Zhou Yingjun , Xiong Liangming , Luo Jie , Chi Nan
Published: February 2021

In this paper, we demonstrate a 100-m five-primary-color-LED-based low-loss pure silica fiber link with the record achievable information rate of 6.84Gbit/s, using probabilistically shaped DMT modulation.
Complex Signal Reconstruction in Direct-Detection OFDM by Solving Temporal Transport-of-Intensity Equation
Authors: Xiang Yating , Tang Ming , Tan Hongxiu , Wang Li , Chen Yizhao , Fu Songnian
Published: February 2021

We achieve complex signal reconstruction by solving temporal transport-of-intensity equation in direct detection OFDM. The performance is optimized by adjusting DC ratio and dispersion value, and compared with the conventional OFDM system.
Adaptive Clock Frequency Based Energy Efficient Provisioning for Virtual Data Centers
Authors: Wang Zhiyuan , Guo Chao , Bose Sanjay K. , Shen Gangxiang
Published: February 2021

An energy-efficient virtual data center (VDC) embedding scheme is proposed through applying dynamic frequency scaling (DFS) to datacenters. An integer linear programming (ILP) model and a heuristic algorithm are developed to demonstrate the effectiveness of the proposed scheme in energy saving.
Microwave Photonic Frequency Divider with Switchable Ratios enabled by an Opto-electronic Oscillator
Authors: Liu Shifeng , Lv Kailin , Kang Xiaochen , Liu Hongfei , Pan Shilong
Published: February 2021

A microwave frequency divider with switchable division ratios is proposed using an opto-electronic oscillating loop based on a dual-parallel Mach-Zehnder modulator. Different frequency division ratios can be achieved by merely adjusting the loop phase.
Inverse Design of Nanophotonic Devices using Deep Neural Networks
Authors: Kojima Keisuke , Tang Yingheng , Koike-Akino Toshiaki , Wang Ye , Jha Devesh , Parsons Kieran , Tahersima Mohammad H. , Sang Fengqiao , Klamkin Jonathan , Qi Minghao
Published: February 2021

We present three different approaches to apply deep learning to inverse design for nanophotonic devices. The forward and inverse regression models use device parameters as inputs and device responses as outputs, and vice versa. The generative model to create a series of improved designs. We demonstrate them to design nanophotonic power splitters with multiple splitting ratios.
Distributed acoustic sensor based sand content detection in solid–liquid two-phase flow
Authors: Li Tongda , Qiao Wei , Li Hao , Sun Qizhen , Yan Zhijun , Liu Deming
Published: February 2021

We demonstrated a real time sand content measurement in solid-liquid flow by employing an optical fiber distribution acoustic sensor (DAS) system, in which the sand content concentration with range of 0 wt.%–0.14 wt.% is measured by detecting acoustic emission (AE) signal generated by sand particles impacting the pipe wall in sand-water two-phase flows. The standard deviation (SD) of statistical method is used to characterize different sand conditions instead of traditional frequency domain analysis. The experiment results showed that the sand concentration has a linear relationship with the standard deviation (SD) of the AE signals, which show the potential of this method in long distance and non-invasive pipeline sand content monitoring.
New concept of silicon photonic MEMS switch based on total internal reflection
Authors: Sun Yi , Dai Daoxin
Published: February 2021

A novel silicon photonic MEMS switch based on total internal reflection (TIR) is proposed for the first time. The key element is a multimode interference (MMI) waveguide crossing with a switchable gap. This photonic switch works very well with a low excess loss of ~0.2 dB and a high extinction ratio of >23 dB in an ultra-broad wavelength range of 1250-1650 nm in the OFF state. The excess loss is still as low as 0.18 dB and the extinction ratio is as high as 58 dB in the ON state.
Subwavelength Grating Waveguide Devices in Silicon Photonics for Microwave Photonic Signal Processing
Authors: Chen Lawrence R.
Published: February 2021

We review recent work on developing integrated optical delay lines based on subwavelength grating waveguide devices in silicon photonics for microwave photonic signal processing.
Multi-Microwave Frequency Comb Generation by Injecting Modulated Beams with Negative Wavelength Detuning in a Single Mode FP-LD
Authors: Bassi Snehi , Chen Hao , Zhang Limin , Nakarmi Bikash , Pan Shilong
Published: February 2021

We demonstrate multi-microwave frequency comb generation using negative injection locking of the modulated beams in a single mode FP-LD. The additional modulator is used to improve the power flatness of the comb generation.
Si-compatible CW Perovskite Laser at Room Temperature and Perovskite Gain-assisted Hyperbolic Metamaterials
Authors: Gu Qing , Li Zhitong , Moon Jiyoung , Alahbakhshi Masoud , Gharajeh Abouzar , Zakhidov Anvar
Published: February 2021

We show stable green lasing in MAPbBr3 perovskite under continuous wave optical pumping at room temperature. We also show loss-compensated, luminescent hyperbolic metamaterials wherein the dielectric constituent is fully composed of MAPbI3 perovskite.
Mesa-Top Single Quantum Dot Arrays as Single Photon Sources: A new paradigm for On-chip Quantum Photonics
Authors: Zhang Jiefei , Chattaraj Swarnabha , Huang Qi , Jordao Lucas , Lu Siyuan , Madhukar Anupam
Published: February 2021

We demonstrate a new paradigm for realizing scalable quantum optical circuits based on a new class of buried ordered spectrally uniform (σλ<2nm) quantum dot single photon source array with highly pure single photon emission (purity>99%).
Polymer-Filled In-Fiber Mach-Zehnder Interferometer with Pt-loaded WO3 Coating for Trace Hydrogen Detection
Authors: Du Bin , He Jun , Guo Kuikui , Xu Xizhen , Wang Ying , Wang Yiping
Published: February 2021

A highly sensitive hydrogen optical fiber sensor based upon Mach-Zehnder interference is demonstrated. The fiber sensor exhibits a high sensitivity of -1948.68 nm/% (vol%) when the hydrogen concentration increases from 0% to 0.8% (vol%).
4 μm HBr Fiber Gas Laser
Authors: Wang Zefeng , Zhou Zhiyue , Li Hao , Cui Yulong , Huang Wei
Published: February 2021

We report here a 4 μm fiber laser in HBr-filled silica hollow-core fibers (HCFs). Pumped by a 2 μm thulium–doped fiber amplifier (TDFA), a maximum 4 μm power of ~350 mW is achieved with a conversion efficiency of about 10%. Furthermore, this system could be extended to generate widely tunable wavelength range up to 4.5 µm by using a small-range tunable 2 µm pump fiber laser, which will open a new opportunity for mid-IR fiber lasers.
Soliton molecules in a robust all polarization-maintaining mode-locked fiber laser
Authors: Zhou Renlai , Fu H. Y. , Li Qian
Published: February 2021

We experimentally demonstrate the generation of soliton molecules in a robust all polarization-maintaining mode-locked fiber laser with a non-reciprocal phase bias.
Asymmetric Cluster Network with Distributed Broadcast-Select Switch and Asymmetric Network Adapter
Authors: Liu Yunqu , Li Zhilong , Jiang Tao , Gao Peng
Published: February 2021

This paper proposes an asymmetric cluster network, and how an asymmetric network is constructed with novel Distributed Broadcast-Select Switch. It discusses the combination of multistage networks and direct interconnection networks with Distributed Broadcast-Select Switch.
4-bar Quasi-phase-matching in AlGaAs-on-insulator square microcavities
Authors: Poon Andrew W. , Tan Bo Xue
Published: February 2021

The AlGaAs-on-insulator material platform offers compact, integrated nonlinear devices. The

4
¯

3
m

point-group symmetry of AlGaAs enables a natural quasi-phase-matching. In this talk, we will present our work on 4-bar quasi-phase-matching in square microcavities.
Silicon-based Optical Neural Network Chip Based on Coherent Detection
Authors: Wang Ruiting , Wang Pengfei , Luo Guangzhen , Yu Hongyan , Zhou Xuliang , Zhang Yejin , Pan Jiaoqing
Published: February 2021

We design a silicon-based optical neural network (ONN) chip based on coherent detection. Nonnegative neural networks are trained and tested on three different datasets and test accuracies are 96.67%, 97.22% and 96.16% respectively.
Soliton Microcombs for RF Photonic Filters
Authors: Hu Jianqi , Brès Camille-Sophie
Published: February 2021

We review recent progress of the microcomb-based RF photonic filters, and discuss the direct synthesis of reconfigurable RF photonic filters leveraging the rich soliton states in microresonators.
Recent advances in Mie-resonant metaphotonics
Authors: Kivshar Yuri S.
Published: February 2021

This talk aims to review recent advances in Mie-resonant metaphotonics, including the physics of bound states in the continuum with isolated dielectric resonators and metasurfaces, generalized Kerker effect, nonlinear, active, and topological effects.
Reduced Relative Intensity Noise of Integrated DFB Laser Array under Injection Locking
Authors: She Xiaoyang , Xiong Bing , Sun Changzheng , Hao Zhibiao , Wang Jian , Wang Lai , Han Yanjun , Li Hongtao , Luo Yi
Published: February 2021

A four-element DFB laser array with double Y-branch couplers is monolithically integrated for stable injection locking. Experiment results show that relative intensity noise of the laser array is obviously reduced under injection locking.
Kilometers long graphene coated optical fibers for fast temperature sensing
Authors: Guo Yiyong , Han Bing , Cao Shanshan , Tan Teng , An Ning , Qin Chenye , Li Yiwei , Rao Yunjiang , Yao Baicheng
Published: February 2021

Kilometers long graphene coated fiber based on industrial production is proposed. The in-fiber graphene illustrates unusually high thermal diffusivity, enabling rapid thermo-optical response in both fiber Bragg grating sensors and distributed fiber temperature sensing systems.
Controlled Wave Structure of the Microfiber for Stretchable Optical Sensors
Authors: Zhu Heng-tian , Xu Fei
Published: February 2021

We demonstrate a stretchable optical sensor based on the wavy microfiber. With great sensitivity and stretchability, the proposed sensor is employed for human respiration monitoring and the finger bend, preforming an application potential for human health monitoring and robotics.
Modal Delay Measurement for Few-Mode Fibers Using Frequency-Domain Complex Transfer Function
Authors: Li Kangmei , Chen Xin , Hurley Jason , Stone Jeffery , Li Ming-Jun
Published: February 2021

We present a simple and robust method for measuring modal delays of few-mode fibers by using complex transfer function. The results for bi-modal and four-mode fibers agree well with direct time domain measurements.
Orbital Angular Momentum States Switching Scheme in Coherent Fiber Laser Array Based Optical Fields Tailoring System
Authors: Hou Tianyue , Chang Qi , Chang Hongxiang , Long Jinhu , Ma Pengfei , Zhou Pu
Published: February 2021

An orbital angular momentum states switching scheme is proposed in coherent fiber laser array based optical fields tailoring systems. This scheme performs well and opens up opportunities for applications employing high-power, fast switchable vortex beams.
Analysis of real-time spectral interference using a deep neural network to reconstruct multi-soliton dynamics in mode-locked lasers
Authors: Li Caiyun , He Jiangyong , He Ruijing , Liu Yange , Yue Yang , Zhang Luhe , Zhu Longfei , Zhou Mengjie , Zhu Kaiyan , Wang Zhi
Published: February 2021

A residual convolutional neural network (RCNN) is introduced to retrieve the separation and relative phase of solitons in soliton molecules in passively mode-locked lasers (PMLs). It proved to be an effective method to explore complex soliton molecule dynamics.
Liquid crystal-assisted coherent combining of fiber lasers for mode-tunable orbital angular momentum beam array generation
Authors: Long Jinhu , Hou Tianyue , Chang Qi , Chang Hongxiang , Su Rongtao , Ma Yanxing , Zhou Pu , Si Lei
Published: February 2021

We propose and experimentally demonstrate a liquid crystal-assisted coherent fiber laser combining system for tailoring orbital angular momentum (OAM) beam arrays. Spatially-distributed multiple OAM beams with synchronously tunable OAM modes can be efficiently generated.
Kilometer-long fast light and superluminal propagation via polarization-matched Brillouin lasing resonance in optical fibers
Authors: Xiao Zhelan , Qiu Zenghuan , Zhang Jilin , Zhang Liang , Pang Fufei , Wang Tingyun
Published: February 2021

We experimentally demonstrated the longest fast light and superluminal propagation along kilometer optical fibers by utilizing a polarization maintaining fiber-based Brillouin lasing oscillator incorporating a population inversion dynamic grating.
56 Gbit/s/λ PAM-4 IM/DD Transmission over 120 km SSMF at O-band Using Cascaded Semiconductor Optical Amplifiers for Data Center Interconnects
Authors: Zhang Jiao , Zhou Wen , Xiao Jiangnan , Yu Jianjun , Zhu Min , Lei Mingzheng , Cai Yuancheng , Zou Yucong , Zhou Qingyi , Xu Weiliang , Wang Jikuan
Published: February 2021

We experimentally demonstrated the first 56 Gbit/s/λ PAM-4 IM/DD system transmission over 120 km SSMF at O-band assisted by cascaded SOAs with the bandwidth-limited optics and simple DSP for high-speed DCI in metro-access networks.
Collaborative Learning in Multi-Domain Optical Networks
Authors: Chen Xiaoliang , Proietti Roberto , Liu Che-Yu , Ben Yoo S. J.
Published: February 2021

This paper presents a collaborative learning framework for multi-domain optical networks to enable cognitive end-to-end networking while guaranteeing the autonomy of each administrative domain.
Multiband Pilot Tone Based Optical Performance Monitoring and Its Application in Mitigating Chromatic Dispersion Fading
Authors: Jiang Zhiping , Tang Xuefeng
Published: February 2021

Multiband pilot tone based optical performance monitoring is introduced and its generation mechanism in digital domain is described. Its tolerance to dispersion fading is analyzed theoretically and confirmed with experimental measurements.
High performance germanium photodetectors for O-band silicon photonics
Authors: Ong Jun Rong , Ang Thomas , Guo Tina X. , Lim Soon Thor , Hong Wang , Png Ching Eng
Published: February 2021

We demonstrate a germanium-on-silicon vertical photodetectors for O-band wavelengths. The device shows <4 nA of dark current and responsivity of 0.87 A/W at -2V. The device bandwidth of 35 GHz is suitable for high speed applications.
InAs/GaAs quantum dot single-section mode-locked lasers monolithically grown on Si (001) substrate with resonant optical feedback
Authors: Wang Zi-Hao , Wei Wen-Qi , Feng Qi , Guo Jing-Jing , Guo Ming-Chen , Wang Ting , Zhang Jian-Jun
Published: February 2021

We demonstrated a single section mode-locked laser monolithically grown on Si with 23.5 GHz repetition rate. With self-injection feedback locking setup, the RF linewidth of MLL was reduced ~100 times from 900kHz to 8kHz.
Magneto-optical Devices for Silicon Photonics
Authors: Mizumoto Tetsuya , Shoji Yuya , Kano Daiki
Published: February 2021

Magneto-optical isolators exhibit performance characteristics of a 30 dB isolation, a 20-dB isolation bandwidth of 8 nm, and a temperature-insensitive isolation. The magneto-optical switch is successfully demonstrated with a latching function.
Scalable Integrated Photonics Beamforming Circuits
Authors: Liu Yuan , Klamkin Jonathan
Published: February 2021

Integrated photonics beamforming circuits are presented. In addition to demonstrating the generation and squint-free beamsteering of millimeter wave signals using photonic true time delay arrays, we propose novel concepts for scaling these arrays.
Dual-frequency tunable optoelectronic oscillator
Authors: Fan Zhiqiang , Su Jun , Qiu Qi
Published: February 2021

A dual-frequency tunable optoelectronic oscillator based on the nonlinear effect of an amplifier is proposed and experimentally demonstrated. In the experiment, a dual-frequency signal with tuning ranges of 6.68-10.6 GHz and 20.04-31.9 GHz is generated.
Invited presentation: Nanoscale sensor devices with diamond color centers
Authors: Nelz Richard , Opaluch Oliver , Hochstetter Axel , Rani Dipti , Oshnik Nimba , Neu Elke
Published: February 2021

We summarize novel fabrication techniques and novel materials for single crystal diamond nanostructures containing shallow nitrogen vacancy color centers and their scalability. We demonstrate near-field energy transfer between NV centers and 2D materials and multi-functional sensing capabilities of NV centers.
Chemical and biochemical optical fibre sensing for invasive and intracellular application: past, present and future
Authors: Baldini Francesco
Published: February 2021

Chemical/biochemical sensing with optical fibres has played an important role in medicine since the 1980s, mainly due to their invasive capabilities. Fibre tip miniaturization has also paved the way for their use in intracellular applications.
Experimental Investigation on the Nonlinearity of Coherent Receiver with Various Modulation Formats
Authors: Ye Tong , Su Xiaofei , Yang Chengwu , Nakashima Hisao , Tao Zhenning , Hoshida Takeshi
Published: February 2021

A simple method to quantitatively evaluate the nonlinearity of coherent receiver with various transmission conditions is proposed. Experiments demonstrate that nonlinear SNR is inversely proportional to kurtosis, with different modulation formats and transmission distances.
Achievable Information Rate Performance Comparison of Frequency-pilot-aided and Blind Carrier Phase Estimation Methods
Authors: Song Zhiyuan , Igarashi Koji
Published: February 2021

For carrier phase estimation in optical coherent receivers, we numerically compare achievable information rate performances of frequency-pilot-aided method and blind phase search method. The frequency-pilot method has higher tolerance for phase noise even for 256QAM.
Receiver IQ Imbalance and Skew Compensation By Frequency Domain Widely Linear Equalizer
Authors: Liang Junpeng , Wang Weiming , Xiang Meng , Cai Yi
Published: February 2021

We propose a frequency domain widely linear 2×2 multi-input and multi-output (MIMO) equalizer, which can compensate receiver IQ imbalance and skew with lower complexity than time domain widely linear equalizer.
Optical Filtering Impairment Monitoring Based on Artificial Neural Network in Coherent Receiver
Authors: Cai Meng , Lun Huazhi , Fu Mengfan , Liu Xiaomin , Yi Lilin , Hu Weisheng , Zhuge Qunbi
Published: February 2021

A digital signal processing (DSP)-aided scheme to monitor optical filtering impairments based on artificial neural network (ANN) is proposed. A root-mean-square error (RMSE) of 0.1-dB is achieved in highly diverse link configurations.
LGBM-improved-MLSE equalizer for 50Gb/s PAM4 IM-DD PON with 10G class optical transceivers
Authors: Zhang Qianwu , Jiang Yuntong , Duan Shuaihang , Wang Zicong , Li Pu , Cao Bingyao , Wu Yating
Published: February 2021

A light gradient boosting machine improved-MLSE equalizer for 50Gb/s PAM4 IM-DD PON with 10G class optical transceivers is proposed and experimental results show that 21 dB power budget is achieved over 15km SSMF.
Performance Evaluation of Digital Back-Propagation with Inaccurate Power Map
Authors: Yi Xingwen , Huang Xiatao , Zhang Jing , Xu Bo , Li Fan , Li Zhaohui
Published: February 2021

In digital back-propagation with non-uniform power map, we show the power change on the latter span exerts a greater impact on the system performance due to the cascading effect of the nonlinear signal-noise interaction.
Load Balancing with Soft Handover for Indoor Hybrid VLC/WiFi Networks
Authors: Guo Dewen , Jin Xianqing , Deng Jiajun , Liu Weijie , Jin Meiyu , Li Shangbin , Gong Chen , Xu Zhengyuan
Published: February 2021

Taking advantage of soft handover and dynamic resource allocation, we propose two load balancing schemes for improving user quality of service in hybrid VLC/WiFi networks. The impacts of load status and movement speed are discussed.
Isolation-Aware 5G-RAN Slice Embedding Over OTN/WDM Metro-Aggregation Networks
Authors: Liu Boyan , Yu Hao , Bai Lin , Zhang Jiawei , Ji Yuefeng
Published: February 2021

We design an isolation mechanism for 5G-RAN slices over OTN/WDM metro-aggregation networks, and an isolation-aware heuristic algorithm is proposed to implement slice embedding. Simulation shows that our approach can map RAN slices efficiently.
Wafer-scale fabrication of ultralow-loss silicon nitride nonlinear photonic circuits
Authors: Liu Junqiu , He Jijun , Wang Rui Ning , Huang Guanhao , Raja A. S. , Lukashchuk A. , Anderson M. H. , Churaev M. , Siddharth A. , Engelsen N. J. , Karpov M. , Tikan A. , Lihachev G. , Riemensberger J. , Weng W. , Kippenberg Tobias J.
Published: February 2021

Recent advances in silicon nitride integrated photonics have achieved ultralow optical losses. Transferring this technology to standard commercial foundries, and merging it with silicon photonics via heterogeneous integration, will seed novel laser and quantum applications.
TiO2 Integrated Nonlinear Photonics
Authors: Fu Meicheng , Li Gaoyuan , Zheng Yi , Guan Xiaowei
Published: February 2021

Our recent achievements on titanium dioxide (TiO2) integrated nonlinear photonics are summarized, including the enhanced four-wave mixing in TiO2 microring resonators and octave-spanning supercontinuum generation in TiO2 waveguides with delicate dispersion engineering.
Optical Nonlinear Activation Functions Based on MZI-Structure for Optical Neural Networks
Authors: Li Qiang , Liu Shengping , Zhao Yang , Wang Wei , Tian Ye , Feng Junbo , Guo Jin
Published: February 2021

We experimentally demonstrated an on-chip optical nonlinear activation function circuit for optical neural networks based on a conventional linear transformer, MZI-mesh. The proposed circuit is reconfigurable to perform multiple types of nonlinear activation functions.
Increasing the power of dissipative Kerr soliton microcomb by bus-resonator coupling control
Authors: Wen Qin , Qin Jinhui , Cui Wenwen , Geng Yong , Zhou Heng , Qiu Kun
Published: February 2021

We demonstrate output power enhancement of dissipative Kerr soliton microcomb by reducing the bus-resonator gap and equivalently increasing the coupling efficiency of the microcavity, providing a straightforward way to realize high efficiency Kerr comb generation.
Microwave frequency, phase, and amplitude control system based on a polarization-multiplexed dual-parallel Mach-Zehnder modulator
Authors: Du Wenhao , Zhu Dan , Liu Jiang , Pan Shilong
Published: February 2021

A microwave frequency, phase, and amplitude control system based on a polarization-multiplexed dual-parallel Mach-Zehnder modulator is proposed. The frequency, phase, and amplitude control with microwave signals are experimentally demonstrated, and no coupling effect exists.
Interaction between topological photonic crystal nanocavity and quantum dots
Authors: Xie Xin , Zhang Weixuan , He Xiaowu , Hao Huiming , Dang Jianchen , Wu Shiyao , Peng Kai , Song Feilong , Xiao Shan , Shi Shushu , Yang Longlong , Ni Haiqiao , Niu Zhichuan , Wang Can , Jin Kuijuan , Zhang Xiangdong , Xu Xiulai
Published: February 2021

We demonstrate a low-threshold topological nanolaser and the weak coupling to single quantum dot in the topological nanocavity, promoting the development of topological nanophotonic circuitry for the manipulation of photons in classical and quantum regimes.
Low-loss microscope optics with an axicon-based beam shaper
Authors: Ochiai Natsuha , Ozeki Yasuyuki
Published: February 2021

We present low-loss microscope optics using an axicon-based beam
shaper, which can convert a Gaussian beam to a ring beam to minimize
the optical loss from blocking by the back aperture of the objective
lens while maintaining spatial resolution. To design the beam shaper,
we characterize the position-dependent transmittance of
high-transmittance objective lenses and numerically calculate the beam
propagation in the beam shaper. We also clarify the effect of
misalignments of the beam shaper and wavefront distortion of the input
beam. Furthermore, we experimentally demonstrate a low-loss microscope
optical system with a high transmittance of 86.6% and high spatial
resolution using the full numerical aperture of the objective
lenses.
Experimental demonstration of 1011 temporal contrast in pure nanosecond optical parametric chirped pulse amplifiers
Authors: Sun Meizhi , Xie Xinglong , Zhu Jianqiang , Zhang Xiaoqi , Zhang Yan , Zhu Ping , Guo Ailin , Kang Jun , Zhu Haidong , Yang Qingwei , Liang Xiao
Published: February 2021

The temporal contrast of ultrashort and ultraintense laser pulses can significantly influence the laser–plasma interactions. As the optical parametric chirped pulse amplification (OPCPA) has been widely adopted in these laser facilities, the inherent optical parametric fluorescence, exhibiting a pedestal in the time window of the pump pulse, has become a significant problem. In this paper, we investigated experimentally its influence on the contrast of the compressed pulses at 808 nm using a multistage OPCPA amplifier. Compared to the highest value of

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ever reported in the literature for such a type of regime, by adjusting the pump energy allocation between OPCPA stages and controlling the gain of small signal regime, we for the first time, to the best of our knowledge, realized a

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temporal contrast in a pure nanosecond OPCPA design at a gain exceeding

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×

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, without adopting any other noise cleaning methods, such as picosecond OPCPA, cross-polarized wave generation, etc. This indicates that the OPCPA has a very significant potential for contrast improvement and to become a candidate for the future high-energy amplifiers in ultrashort high-power laser facilities.
Time resolved speckle contrast optical spectroscopy at quasi-null source-detector separation for non-invasive measurement of microvascular blood flow
Authors: Pagliazzi Marco , Colombo Lorenzo , Vidal-Rosas Ernesto E. , Dragojević Tanja , Parfentyeva Veronika , Culver Joseph P. , Konugolu Venkata Sekar Sanathana , Di Sieno Laura , Contini Davide , Torricelli Alessandro , Pifferi Antonio , Dalla Mora Alberto , Durduran Turgut
Published: February 2021

Time (or path length) resolved speckle contrast optical spectroscopy (TD-SCOS) at quasi-null (2.85 mm) source-detector separation was developed and demonstrated. The method was illustrated by in vivo studies on the forearm muscle of an adult subject. The results have shown that selecting longer photon path lengths results in higher hyperemic blood flow change and a faster return to baseline by a factor of two after arterial cuff occlusion when compared to SCOS without time resolution. This indicates higher sensitivity to the deeper muscle tissue. In the long run, this approach may allow the use of simpler and cheaper detector arrays compared to time resolved diffuse correlation spectroscopy that are based on readily available technologies. Hence, TD-SCOS may increase the performance and decrease cost of devices for continuous non-invasive, deep tissue blood flow monitoring.
n-type Ge/Si antennas for THz sensing
Authors: Chavarin C. A. , Hardt E. , Gruessing S. , Skibitzki O. , Costina I. , Spirito D. , Seifert W. , Klesse W. , Manganelli C. L. , You C. , Flesch J. , Piehler J. , Missori M. , Baldassarre L. , Witzigmann B. , Capellini G.
Published: February 2021

Ge-on-Si plasmonics holds the promise for compact and low-cost solutions in the manipulation of THz radiation. We discuss here the plasmonic properties of doped Ge bow-tie antennas made with a low-point cost CMOS mainstream technology. These antennas display resonances between 500 and 700 GHz, probed by THz time domain spectroscopy. We show surface functionalization of the antennas with a thin layer of α-lipoic acid that red-shifts the antenna resonances by about 20 GHz. Moreover, we show that antennas protected with a silicon nitride cap layer exhibit a comparable red-shift when covered with the biolayer. This suggests that the electromagnetic fields at the hotspot extend well beyond the cap layer, enabling the possibility to use the antennas with an improved protection of the plasmonic material in conjunction with microfluidics.
Diving angle optimization of BRF in a single-frequency continuous-wave wideband tunable titanium:sapphire laser
Authors: Wei Jiao , Cao Xuechen , Jin Pixian , Su Jing , Lu Huadong , Peng Kunchi
Published: February 2021

In this study, the optimal condition of a multi-plate birefringent filter (BRF) used in a single-frequency continuous-wave (CW) tunable laser is theoretically and experimentally investigated. The dependence of the optimal condition on the diving angle of the BRF optical axis is first deduced. Based on the proposed optimal condition, the diving angle of the BRF optical axis is optimized to 29.1°. Subsequently, a novel off-axis multi-plate BRF with a thickness ratio of 1:2:5:9 and the thinnest plate of 0.5 mm is designed and utilized in a tunable titanium:sapphire (Ti:S) laser. As a result, the operating wavelength of the Ti:S laser is successfully tuned from 691.48 to 995.55 nm by rotating the BRF 18°. The obtained tuning slope efficiency and maximum tuning range are 16.9 nm/° and 304.07 nm, respectively. The experimental results agree well with the theoretical analysis results, which provide a feasible approach for designing BRFs to satisfy the requirements of other single-frequency CW wideband tunable lasers.
Diffuse photon remission from thick opaque media of the high absorption/scattering ratio beyond what is accountable by the Kubelka–Munk function
Authors: Piao Daqing , Sun Tengfei
Published: February 2021

The Kubelka–Munk (KM) theory of diffuse photon remission from opaque media is widely applied to quality-control processes. Recent works based on radiative transfer revealed that the KM function as the backbone parameter of the method may saturate at strong absorption to cause the KM approach to be unfit to predict the change of diffuse reflectance from the medium at strong absorption. We demonstrate by empirical means based on Monte Carlo results that diffuse photon remission from a strong-absorbing medium depends simply upon the absorption/scattering ratio when evaluated over a large area centered at the point of illumination differing in geometry from those convenient for the KM approach. Our empirical prediction gives

∼

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%

mean errors of the diffuse photon remission from thick opaque medium having an absorption coefficient ranging 0.001 to up to 1000 times stronger than the reduced-scattering coefficient. A slight modification to the KM function in terms of the absorption weighting and absorption-scattering coupling for use within the KM approach also noticeably improves the prediction of diffuse photon remission from thick opaque medium of strong absorption. Our empirical model and the KM approach using the modified KM function were compared against measurements from a thick opaque medium, of which the absorption coefficient was changed over four orders of magnitude.
Enhanced radiative and thermal properties from surface encapsulation of InAs nanowires
Authors: Li Xinxin , Walhof Alexander C. , Dai Weitao , Arslan Ilke , Liu Yuzi , Toor Fatima , Prineas John P.
Published: February 2021

In this work, photoluminescence (PL), quantum efficiency and carrier dynamics are investigated in indium arsenide (InAs) nanowires (NWs) with various surface treatments, including a molecular beam epitaxy (MBE)-grown semiconductor shell passivation, sulfur-passivation, alumina (Al2O3) coating by atomic layer deposition (ALD) and polydimethylsiloxane (PDMS) spin-coating. The ALD-dielectric layer-coated InAs core-shell NWs show a maximum 13-fold increase in PL intensity. In contrast to the previous reports, this enhancement is found to be due to increased radiative rate from an enhanced Purcell factor, better thermal conductance and higher carrier injection within the NWs instead of improved surface quality. Numeric simulations confirm the experimentally observed increased radiative rate. Further improvements are suggested with even thicker capped InAs NWs. Carrier lifetime in surface-treated NWs is extended and shows long-term stability, critical for practical devices.