A5084395490- Optical Network Technologies
- Advanced Photonic Communication Systems
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
- Photonic Crystal and Fiber Optics
- Semiconductor Lasers and Optical Devices
- Advanced Optical Network Technologies
- Laser-Matter Interactions and Applications
- PAPR reduction in OFDM
- Optical Wireless Communication Technologies
- Chaos control and synchronization
- Blind Source Separation Techniques
- Orbital Angular Momentum in Optics
- Neural Networks and Reservoir Computing
- Ultra-Wideband Communications Technology
- Optical Coherence Tomography Applications
- Nonlinear Dynamics and Pattern Formation
- Gyrotron and Vacuum Electronics Research
- Chaos-based Image/Signal Encryption
- Plasmonic and Surface Plasmon Research
- Advanced Wireless Communication Techniques
- Quantum optics and atomic interactions
- Advanced Optical Sensing Technologies
- Radio Frequency Integrated Circuit Design
Guangdong University of Technology
2020-2025
Tsinghua University
2024
Huazhong University of Science and Technology
2013-2023
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
2023
Fudan University
2023
Peng Cheng Laboratory
2022-2023
Guangzhou Institute of Advanced Technology
2023
Key Laboratory of Guangdong Province
2021
Wuhan National Laboratory for Optoelectronics
2011-2020
Nanjing University of Information Science and Technology
2018
Manipulation of group-velocity-locked vector solitons (GVLVSs) is numerically proposed and experimentally demonstrated. A pseudo-high-order GVLVS could be generated from a fundamental with the help polarization-resolved system. Specifically, two-humped pulse along one polarization single-humped orthogonal obtained. The phase difference between two humps 180°.
Abstract High-speed polarization management is highly desirable for many applications, such as remote sensing, telecommunication, and medical diagnosis. However, most of the approaches rely on bulky optical components that are slow to respond, cumbersome use, sometimes with high drive voltages. Here, we overcome these limitations by harnessing photonic integrated circuits based thin-film lithium niobate platform. We successfully realize a portfolio devices essential functionalities,...
The transmission performance of a free-space optical (FSO) link could be severely degraded due to atmospheric turbulence, which causes the temporal and spatial fluctuation light intensity. Both space diversity reception technique (SDRT) advanced modulation formats can successfully mitigate impairments turbulence. purpose this paper is study compare bit-error-rate (BER) several widely used under different turbulence scenarios with without SDRT. studied in include on–off keying (OOK),...
We report a highly sensitive fiber-optic sensor based on two cascaded intrinsic fiber Fabry-Perot interferometers (IFFPIs).The IFFPIs have different free spectral ranges (FSRs) and are formed by short section of hollow core photonic crystal sandwiched single mode fibers.With the superposition reflective spectrum with FSRs, Vernier effect will be generated in proposed we found that strain sensitivity can improved from 1.6 pm/με for IFFPI to 47.14 employing effect.The embed metglas ribbon also...
We propose and experimentally demonstrate a directional torsion sensor based on Mach-Zehnder interferometer formed in multicore fiber (MCF) with ~570-μm-long helical structure (HS). The HS was fabricated into the MCF by simply pre-twisting then heating CO2 laser splicing system. This device shows capability of measurement from -17.094 rad/m to 15.669 sensitivity ~0.118 nm/(rad/m). Moreover, since multiple interferences respond differently temperature simultaneously, cross-sensitivity...
We present the fabrication of fiber Bragg gratings (FBGs) in a trench-assisted heterogeneous multicore (MCF). Two obviously different reflection peaks are obtained due to slight difference refractive indices between center core and outer cores. To investigate reflections two FBGs simultaneously, only segment multimode is inserted lead-in single mode MCF. The experimental results confirm that curvature sensitivity FBG sinusoidal function bending orientation angle. maximum linear about 0.128...
Inverse-designed free-form nanophotonic structures have shown great potential in designing ultra-compact integrated photonic devices, but strict fabrication requirements may hinder further applications. We propose here a photonic-crystal-like (PhC-like) subwavelength structure, which is insensitive to the lag effect that most common error. A colorless 3 dB coupler employing such structure designed, fabricated, and characterized. With only one-step etching, coupling region of our final device...
An elegant method of nonlinear Fourier transform (NFT) has attracted worldwide research interests and such NFT methodology provides a new viewpoint on the physics laser dynamics. Recently, use been proposed for investigation radiation, indicating capability to characterize ultrashort pulse in frequency domain. Here, pure solitons are numerically separated from resonant continuous wave (CW) background fiber by utilizing NFT. It is identified that soliton CW have different eigenvalue...
Fiber lasers are a paradigm of dissipative systems, which distinguish themselves from Hamilton system where energy is conservative. Consequently, pulses generated in fiber laser always accompanied by the continuous wave (CW). Under certain hypothesis, can be considered as soliton, product system. Therefore, all descriptions solitons approximate. Coexistence and CW prevents unveiling real nonlinear dynamics lasers, such soliton interactions. Pulse behavior represented state single pulse,...
We propose a novel scheme to generate ultrawideband (UWB) monocycle pulses based on cross-phase modulation (XPM) of semiconductor optical amplifier (SOA). The proposed system consists SOA and an bandpass filter (OBF). Due the XPM, continuous wave (CW) probe signal is phase modulated by another Gauss pulse in SOA. OBF will convert intensity modulation. A pair polarity-reversed UWB achieved locating carrier at positive negative linear slopes OBF. Both cases conform definition Federal...
We demonstrate an ultralong cavity, all-fiber, all-normal-dispersion Yb-doped fiber laser that is passively mode locked by a semiconductor saturable absorber mirror (SESAM). Without any discrete dispersion-compensation components or conventional spectral filters, the SESAM works together with strongly chirped pulse and nonlinearity induced spectrum broadening to perform filtering-equivalent function, thus stabilizing locking. The generates 4.3 nJ stable mode-locked pulses 397 kHz fundamental...
Towards the next generation optical access network supporting large capacity data transmission to enormous number of users covering a wider area, we proposed hybrid wavelength-space division multiplexing (WSDM) architecture utilizing multicore fibers with advanced modulation formats. As proof concept, experimentally demonstrated WSDM duplex using our developed and fabricated (7-core) 58.7km distance. cost-effective scheme for network, OFDM-QPSK signal has been intensity modulated on...
Abstract Optical fiber sensors for strain measurement have been playing important roles in structural health monitoring buildings, tunnels, pipelines, aircrafts, and so on. A highly sensitive sensor based on helical structures (HSs) assisted Mach-Zehnder interference an all-solid heterogeneous multicore (MCF) is proposed experimentally demonstrated. Due to the HSs, a maximum sensitivity as high −61.8 pm/με was achieved. This highest among interferometer-based reported far, best of our...
We propose a design strategy of elliptical core few-mode fiber (e-FMF) that supports three spatial modes with enhanced mode spacing between LP11a and LP11b, to suppress intra-mode coupling during mode-division multiplexing (MDM) transmission. Our theoretical investigations show there exist two optimization regimes for the e-FMF, as comparison traditional circular FMF(c-FMF). At regime three-mode operation, occurs trade-off bending-induced loss. Meanwhile, in terms five-mode regime,...
In this paper, a high-temperature fiber sensor based on an optical Fabry–Perot interferometer is fabricated by splicing section of simplified hollow-core between two single-mode fibers (SMFs) and cleaving one the SMFs to certain length. With superposition three beams light reflected from joints end face cleaved SMF, modified Vernier effect will be generated in proposed structure improve sensitivity temperature measurement. The envelope spectrum head modulated ambient head. By monitoring...
We propose a novel method to simultaneously improve the physical layer security and transmission performance of orthogonal frequency division multiplexing (OFDM) passive optical network system by using chaos fractional Fourier transform (FrFT) techniques. The designed 3-D chaotic sequences are used form training sequence for time synchronization, perform OFDM subcarriers masking, control order FrFT operation. analyses show that whole key space size proposed scheme could be beyond 10 <sup...
A dual-field encryption scheme of an orthogonal frequency division multiplexing passive optical network (OFDM-PON) is proposed based on analog–digital hybrid chaotic system. In our scheme, the downstream data are encrypted in field, and upstream electrical field. The system circumvents security vulnerabilities both analog digital chaos, e.g., periodicity chaos masked by one, time delay signature concealed injecting chaos. Meanwhile, key space dimension enlarged. Simulation results show...
We proposed and experimentally demonstrated a few mode fiber (FMF) based Raman distributed temperature sensor (RDTS) to extend the sensing distance with enhanced signal-to-noise ratio (SNR) of backscattered anti-Stokes spontaneous scattering. Operating in quasi-single (QSM) efficient fundamental excitement, FMF allows much larger input pump power before onset stimulated scattering compared standard single (SSMF) mitigates detrimental differential group delay (DMGD) existing conventional...
A pruning method of artificial neural network based nonlinear equalizer (ANN-NLE) is proposed and validated for single-sideband 4-ary pulse amplitude modulation (SSB-PAM4) in IM/DD system. As a classifier, ANN capable to form complex boundary among different classifications, which considered as an appropriate way mitigate the impairments optical communication In this paper, first, we introduce operation principle traditional linear (LE) NLE such volterra (VE). Then make analogy LE, VE...
We experimentally demonstrate C-band 2 × 56 Gb/s pulse-amplitude modulation (PAM)-4 signal transmission over 100 km standard single-mode fiber (SSMF) using 18 GHz direct-modulated lasers (DMLs) and direct detection, without inline optical amplifier. A delay interferometer (DI) at the transmitter side is used to extend reach from 40 km. digital Volterra filter receiver mitigate nonlinear distortions. obtain an average bit error ratio (BER) of 1.5 10(-3) for PAM-4 after SSMF optimal input...
We experimentally evaluated the performance of 400G coherent and IMDD transceivers for intra-datacenter interconnects, showed that can achieve a higher power budget with comparable ASIC consumption.
In recent years, many conventional image denoising techniques have been intensively studied to enhance the signal noise ratio (SNR) of Brillouin optical time domain analyzer (BOTDA), due their superior performance one-dimensional methods. However, in case low sampling rate, details are smoothed out less useful information, resulting a degradation spatial resolution. Moreover, these algorithms quite time-consuming compared with BOTDA measuring time. To overcome drawbacks, we employ...
Distributed optical fiber Brillouin sensors detect the temperature and strain along a according to local frequency shift (BFS), which is usually calculated by measured spectrum using Lorentzian curve fitting. In addition, cross-correlation, principal component analysis, machine learning methods have been proposed for more efficient extraction of BFS. However, existing only process individually, ignoring correlation in time domain, indicating that there still room improvement. Here, we...
Providing physical layer security at the lowest network in fiber-optic communication systems is a technical challenge worldwide. Here, we propose and experimentally demonstrate pure hardware optical encryption scheme based on temporal spreading self-feedback phase for high-speed long-distance physical-layer secure communication. A record high bit-rate-distance product of 6400 Gb/s km successfully achieved by transmission 32 on-off-keying modulated confidential signal over 200 fiber link. The...