A5102846484- Particle Accelerators and Free-Electron Lasers
- Optical Network Technologies
- Particle accelerators and beam dynamics
- Advanced Photonic Communication Systems
- Superconducting Materials and Applications
- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Gyrotron and Vacuum Electronics Research
- Particle Detector Development and Performance
- Advanced Optical Network Technologies
- Photocathodes and Microchannel Plates
- PAPR reduction in OFDM
- Advanced Fiber Optic Sensors
- Digital Media Forensic Detection
- Semiconductor Lasers and Optical Devices
- Orbital Angular Momentum in Optics
- Advanced Steganography and Watermarking Techniques
- Electron and X-Ray Spectroscopy Techniques
- Magnetic confinement fusion research
- Microwave Engineering and Waveguides
- Optical Wireless Communication Technologies
- Image Processing Techniques and Applications
- Image and Signal Denoising Methods
- Advancements in Photolithography Techniques
- Photonic Crystal and Fiber Optics
Huazhong University of Science and Technology
2007-2024
Brookhaven College
2021-2024
Brookhaven National Laboratory
2011-2024
Chongqing University
2024
Beihang University
2024
Zhejiang Normal University
2009-2023
Wuhan National Laboratory for Optoelectronics
2015-2022
Chinese University of Hong Kong
2022
SLAC National Accelerator Laboratory
2021
Tianjin University
2012-2020
The presence of duplicated regions in the image can be considered as a tell-tale sign for forgery, which belongs to research field digital forensics. In this paper, blind forensics approach based on DWT (discrete wavelet transform) and SVD (singular value decomposition) is proposed detect specific artifact. Firstly, applied image, used fixed-size blocks low-frequency component sub-band yield reduced dimension representation. Then SV vectors are then lexicographically sorted will close list,...
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...
This document presents BNL's plan for an electron-ion collider, eRHIC, a major new research tool that builds on the existing RHIC facility to advance long-term vision Nuclear Physics discover and understand emergent phenomena of Quantum Chromodynamics (QCD), fundamental theory strong interaction binds atomic nucleus. We describe scientific requirements such facility, following up community-wide 2012 white paper, 'Electron-Ion Collider: Next QCD Frontier', present design concept incorporates...
Direct detection optical orthogonal frequency division multiplexing (DDO-OFDM) transmission with constant amplitude zero autocorrelation (CAZAC) sequence equalization is proposed and experimentally demonstrated. Simulation results show that more than 2-dB peak-to-average power ratio (PAPR) reduction can be realized using CAZAC equalization, 50-km standard single mode fiber (SSMF) of 4.11-Gb/s QPSK-OFDM achieved bit-error rate (BER) under forward error correction limit. Transmission...
A novel dual-loop optoelectronic oscillator (OEO) with different wavelengths is demonstrated. The principle of OEO analyzed theoretically. There almost no beating noise due to the optical domain wavelengths. In our experiment, a 20-GHz radio frequency (RF) high quality obtained. phase microwave signal measured be -120.6 dBc/Hz at 10 kHz. loop drift compensated by fiber stretcher using phase-loop locked technology and stability RF has been improved greatly. system <; ± 92.5 mHz within 3 h....
We propose a blind and fast modulation format identification (MFI) enabled by the digital frequency-offset (FO) loading technique for hitless coherent transceiver. Since information is encoded to FO distribution during signal processing (DSP) at transmitter side (Tx), we can use Fourier transformation based estimation (FFT-FOE) method obtain of individual data block after constant modulus algorithm (CMA) pre-equalization receiver side, in order realize non-data-aided (NDA) MFI. The obtained...
Exemplar-based inpainting technique can be used to remove objects from an image and play visual tricks, which would affect the authenticity of images. In this paper, a blind detection method based on zero-connectivity feature fuzzy membership is proposed detect specific doctoring. Firstly, labeling applied block pairs yield matching degree for all blocks in region suspicious, memberships are computed by constructing ascending semi-trapezoid function. Then tampered regions identified cut set....
Based on a geometric caustic argument and diffraction catastrophe theory, we generate novel form of accelerating beams using symmetric 3/2 phase-only pattern. Such can be called quad Airy (AQABs) because they look very much like four face-to-face combined beams. Optical characteristics AQABs are subsequently investigated. The research results show that the have axial-symmetrical centrosymmetrical transverse intensity patterns quasi-diffraction-free propagation features for their main lobes...
Towards 100G beyond large-capacity optical access networks, wavelength division multiplexing (WDM) techniques incorporating with space (SDM) and affordable spectrally efficient advanced modulation formats are indispensable. In this paper, we proposed experimentally demonstrated a cost-efficient multicore fiber (MCF) based hybrid WDM-SDM network self-homodyne coherent detection (SHCD) downstream (DS) direct filter bank multi carrier (DDO-FBMC) upstream (US). the DS experiments, inner core of...
The 2-μm optical band has gained much attention recently due to its potential applications in fiber communication systems. One constraint this wavelength region is that the electrical bandwidth of components like modulators and photodetectors limited by immature manufacturing technologies. Here we experimentally demonstrated high-speed signal generation transmission under bandwidth-constrained scenario at 2-μm. It enabled direct-detection filter bank multicarrier (FBMC) modulation technique...
The diamond amplifier (DA) is a new device for generating high-current, high-brightness electron beams. Our transmission-mode tests show that, with single-crystal, high-purity diamonds, the peak current density greater than 400 mA/mm², while its average can be more 100 mA/mm². gain of primary electrons easily exceeds 200, and independent their within practical range DA applications. We observed emission. maximum emission measured was 40, bunch charge 50 pC/0.5 mm². There 35% probability an...
We demonstrate a scheme for long-range, high-precision absolute distance measurement based on frequency detection using two optoelectronic oscillators to convert information information. The two-oscillator design offers the unique advantage of self-referencing. By taking accumulative magnification theory, error measured is decreased by approximately 10⁵ fold, which significantly improves precision distance. In our experiments, maximum ±1.5 μm at an emulated 3.35 km, including drift 1 in air...
We apply the signal- and channel-independent constant amplitude zero autocorrelation sequence (CAZAC) precoding technique to a bandwidth-limited longer-reach DDO-OFDM system, propose simplified adaptive modulation scheme according equalized SNR per subcarrier after CAZAC precoding. Simulation results show that with optimized index, conventional 8.23-Gb/s double sideband (DSB) modulated QPSK-OFDM signal cannot realize 100 km standard single-mode fiber (SSMF) transmission at given received...
In this paper, we propose and demonstrate a joint optical signal-to-noise ratio (OSNR) nonlinear distortions estimation method. The OSNR is calculated by considering either the link parameters or correlation operations of training symbols. in calculation comes from different sensitivities these two methods. indicator NL penalty defined as distortion power to signal power. As method, based on parameters, has low computational complexity, symbol used for inherently indispensable frame...
A joint timing offset (TO) and frequency (FO) estimation algorithm is proposed for polarization division multiplexing (PDM) coherent optical orthogonal frequency-division (CO-OFDM) systems. It realized by taking the advantage of time-frequency property fractional Fourier transformation (FrFT) encoded training symbols. Compared with classical Schmidl & Cox method, exhibits robust result poor signal-to-noise ratio (OSNR) nonlinear interference. For estimation, a quite large FO ranges [-5GHz +...
On the basis of photoelectric properties and hydrophilicity multimode interference Graphene Oxide (GO), this study proposes an all-fiber humidity sensor. Two core-offset regions are constructed with a fiber fusion splicer, GO film is coated on single-mode (SMF) between to form humidity-sensitive Mach–Zehnder structure. As external environment changes, refractive index light in SMF modulated by humidity. External measured detecting changes wavelength transmission spectrum sensing A saturated...
We design a new kind of fractional Fourier transform superimposed training sequence (TS) to simultaneously estimate linear distortions including chromatic dispersion (CD), timing offset (TO), and frequency (FO), etc. Without sacrificing additional spectrum efficiency, the scheme can reduce computational complexity sharply compared regular estimation method. The feasibility proposed is verified by simulations 28 GBaud dual polarization quadrature phase-shift keying (DP-QSPK) 16-ary amplitude...
This study proposes a new type of fused cone Sagnac ring humidity sensor based on graphene properties. First, the single-mode optical fiber (SMF) is with photonic crystal (PCF) to form SMF-PCF-SMF interference. Then, SMFs at both ends PCF are folded in half ring. The placed pulling translation platform for coupling. A interferometer that connects formed by applying birefringence effect melting prepared special platform, and coated area PCF. excellent properties utilized measure humidity....
Capacity is the eternal pursuit for communication systems due to overwhelming demand of bandwidth hungry applications. As backbone infrastructure modern networks, optical fiber transmission system undergoes a significant capacity growth over decades by exploiting available physical dimensions (time, frequency, quadrature, polarization and space) carrier multiplexing. For each dimension, stringent orthogonality must be guaranteed perfect separation independent multiplexed signals. To catch up...
We proposed and demonstrated an in-band optical signal-to-noise ratio (OSNR) monitoring method for a polarization-division-multiplexed coherent orthogonal frequency-division-multiplexing (PDM-CO-OFDM) system. OSNR of the PDM signals on both polarization tributaries can be simultaneously monitored by calculating electrical SNR with low complexity taking advantage uncorrelation property between noise training symbol, which is used conventional frame synchronization. This technique verified in...