A5075414103- Optical Network Technologies
- Advanced Optical Network Technologies
- Photonic and Optical Devices
- Advanced Photonic Communication Systems
- Software-Defined Networks and 5G
- Semiconductor Lasers and Optical Devices
- Advanced Fiber Optic Sensors
- Advanced Fiber Laser Technologies
- Cloud Computing and Resource Management
- Neural Networks and Reservoir Computing
- Interconnection Networks and Systems
- Advanced Wireless Communication Techniques
- Orbital Angular Momentum in Optics
- Optical Wireless Communication Technologies
- PAPR reduction in OFDM
- Error Correcting Code Techniques
- Optical Coatings and Gratings
- Quantum Computing Algorithms and Architecture
- Flood Risk Assessment and Management
- Quantum Information and Cryptography
- Advancements in PLL and VCO Technologies
- Optical Systems and Laser Technology
- Optical Coherence Tomography Applications
- VLSI and Analog Circuit Testing
- Hydrology and Watershed Management Studies
Beijing University of Posts and Telecommunications
2015-2024
State Key Laboratory of Information Photonics and Optical Communications
2012-2024
Henan Agricultural University
2023-2024
Beihang University
2021
Fiberhome Technology Group (China)
2021
Technical University of Denmark
2021
Beijing Normal University
2021
Aerospace Information Research Institute
2019-2020
Chinese Academy of Sciences
2018-2020
University of Chinese Academy of Sciences
2018-2020
The successful launch of Luojia 1-01 complements the existing nighttime light data with a high spatial resolution 130 m. This paper is first study to assess potential using imagery for investigating artificial pollution. Eight images were selected conduct geometric correction. Then, ability detect pollution was assessed from three aspects, including comparison between and Suomi National Polar-Orbiting Partnership Visible Infrared Imaging Radiometer Suite (NPP-VIIRS), source patterns urban...
Automatic water body extraction method is important for monitoring floods, droughts, and resources. In this study, a new semantic segmentation convolutional neural network named the multi-scale (MWEN) proposed to automatically extract bodies from GaoFen-1 (GF-1) remote sensing images. Three networks (fully (FCN), Unet, Deeplab V3+) are employed compare with performance of MWEN. Visual comparison five evaluation metrics used evaluate these (CNNs). The results show following. (1) in multiple...
A distributed fiber optic vibration sensor is described, in which two Michelson interferometers are used as phase detectors and 3×3 couplers deployed to demodulate the time-varying change caused by vibration. The separated four wavelength division multiplexers. position of obtained signal correlation, can be a perimeter security locate intruder. experimental results with 4012 m discussed.
Software defined networking and OpenFlow, which allow operators to control the network using software running on a operating system within an external controller, provide maximum flexibility for operator network, match carrier's preferences given its centralized architecture, simplicity, manageability. In this paper, we report field trial of OpenFlow-based unified plane (UCP) multilayer multigranularity optical switching networks, verifying overall feasibility efficiency, quantitatively...
We experimentally present a proof-of-concept demonstration of OpenFlow-based wavelength path control for lightpath provisioning in transparent optical networks, assessing its overall feasibility and quantitatively evaluating the network performances.
OpenFlow, as an open-source protocol for network virtualization, is also widely regarded a promising control plane technique heterogeneous networks. But the utilization of OpenFlow to wavelength switched optical has not been investigated. In this paper, first time, we experimentally present proof-of-concept demonstration OpenFlow-based path lightpath provisioning in transparent We propose two different approaches (sequential and delayed approaches) setup (active passive release by using...
A universal non-line-of-sight (NLOS) ultraviolet single-scatter propagation model in noncoplanar geometry is proposed to generalize an existing restricted analytical model. This generalized considers that the transmitter and receiver cone axes lie same plane or different planes, where they can be pointed arbitrary directions. The verified by extensive simulations, showing consistent with original NLOS Monte Carlo path loss performance further investigated terms of geometric settings...
This paper numerically and experimentally investigates the performance of free-space optical receiver using modes diversity coherent receipt under moderate-to-strong turbulence. By utilizing a three-mode photonic lantern with digital maximum ratio combining, 40 Gbps QPSK signal is received. The turbulence strength measured by beam diameter to atmospheric coherence length, D/r0. larger D/r0, stronger is, vice versa. Compared conventional single mode fiber based receipt, required transmitted...
We report a world first field trial of an OpenFlow-based unified control plane for multilayer multi-granularity optical networks, verifying its overall feasibility and efficiency, quantitatively evaluating the latencies end-to-end path creation restoration.
Vertical couplers play a pivotal role as essential components supporting interconnections between fibers and photonic integrated circuits (PICs). In this study, we propose demonstrate high-performance perfectly vertical coupler based on three-stage inverse design method, realized through single full etching process 220-nm silicon-on-insulator (SOI) platform with backside metal mirror. Under surface-normal fiber placement, experimental results indicate remarkable 3-dB bandwidth of 99 nm peak...
Mapping land surface water automatically and accurately is closely related to human activity, biological reproduction, the ecological environment. High spatial resolution remote sensing image (HSRRSI) data provide extensive details for gives reliable support accurate extraction of information. The convolutional neural network (CNN), widely applied in semantic segmentation, provides an automatic method This paper proposes a new lightweight CNN named Lightweight Multi-Scale Land Surface Water...
Urban particulate matter 2.5 (PM2.5) pollution and public health are closely related, concerns regarding PM2.5 widespread. Of the underlying factors, urban morphology is most manageable. Therefore, investigations of impact three-dimensional (3D) on concentration have important scientific significance. In this paper, 39 monitoring sites Beijing in China were selected with automatic data that collected 2013. This set was used to analyze impacts meteorological condition transportation...
We propose a linear mapping relationship between the polarization of fundamental mode and cylindrical vector (CV) modes on first-order Poincaré sphere (FOPS) in fiber. The new method is based four-dimensional complex Jones matrices terms linearly polarized bases. With our theoretical model, an all-fiber approach to generate arbitrary CV beams FOPS proposed theoretically verified experimentally. In experiment, through combination converter two-segment cascaded few-mode fiber with fixed...
The real-time CCDM and inverse were realized in an FPGA. DM achieved a throughput of 16.8GBaud supported on-line reconfiguration to realize different entropies with fine granularity.
Protected areas (PAs) with natural, ecological, and cultural value play important roles related to biological processes, biodiversity, ecosystem services. Over the past four decades, spatial range intensity of light pollution in China has experienced an unprecedented increase. Few studies have been documented on across PAs China, especially regions that provide a greater amount biodiversity conservation. Here, nighttime satellite images from Defense Meteorological Satellite Program...
Elliptical-core few mode fiber (EC-FMF) is used in a division multiplexing (MDM) transmission system to release multiple-input-multiple-output (MIMO) digital-signal-processing, which reduces the cost and complexity of receiver. However, EC-FMF does not match with conventional multiplexers/de-multiplexers (MUXs/DeMUXs) such as photonic lantern, leading extra coupling loss crosstalk. We design elliptical-core mode-selective lanterns (EC-MSPLs) six modes, can well MIMO-free MDM systems....
Large-scale surface water mapping not only helps us protect, utilize and manage resources but also contributes to the understanding of climate change hydrologic cycle. A recent study showed that a multilayer perceptron (MLP) neural network is an effective method identify various types from Landsat 8 Operational Land Imager (OLI) satellite imagery. We use this produce map China for 2015 (SWMC-2015) at 30 m pixel size. The accuracy SWMC-2015 was assessed with set random validation points....
In this paper, a polar coded probabilistic shaping (PS) 8-ary pulse amplitude modulation (PAM8) based on many-to-one (MTO) mapping is investigated for short-reach optical interconnection. By ingeniously assigning parity bits to ambiguities positions, no extra PS redundancy and complex distribution matcher are required in the scheme comparing traditional (PAS). The noise distributions after different transmission distances studied an optimal clock recovery method signal proposed degrade...
When photonics integrated circuits (PICs) become more massive in scale, the area of chip can’t be taken full advantage with 2×2 waveguide crossings a 90° intersection angle. Crossings small angles would better idea to further improve utilization, but few works have researched different angles. In this paper, order an ultra-compact footprint and flexible angle while keeping high performance, we report series compact X-shaped silicon-on-insulator (SOI) waveguides for fundamental transverse...