A5114514504- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
- Advanced Fiber Laser Technologies
- Advanced Numerical Methods in Computational Mathematics
- Electromagnetic Simulation and Numerical Methods
- Electromagnetic Scattering and Analysis
- Matrix Theory and Algorithms
- Probabilistic and Robust Engineering Design
- Power Systems and Technologies
- Distributed Control Multi-Agent Systems
- Nonlinear Partial Differential Equations
- Advanced Measurement and Detection Methods
- Neural Networks Stability and Synchronization
- Magneto-Optical Properties and Applications
- Power Systems and Renewable Energy
- Stability and Control of Uncertain Systems
- Advanced Vision and Imaging
- Optical Network Technologies
- Model Reduction and Neural Networks
- Advanced Photonic Communication Systems
- Advanced Mathematical Physics Problems
- Image and Object Detection Techniques
- Microgrid Control and Optimization
- Advanced Manufacturing and Logistics Optimization
- Electromagnetic Compatibility and Noise Suppression
Shenzhen University
2018
Hong Kong Polytechnic University
2016-2017
Jinan University
2013
Shaanxi University of Science and Technology
2012
Guangdong University of Technology
2011
North China Electric Power University
2011
University of Colorado Boulder
2007
University of Colorado System
2006
In coherent optical communication systems, the transmitter usually employs an in-phase and quadrature (IQ) modulator to perform electrical-to-optical up-conversion. However, some environmental factors, such as temperature mechanical stress, strongly influence stability. To stabilize quality of transmitted signal, auto bias control (ABC) is essential keep in optimum bias. this paper, we present a novel method ABC for orthogonal frequency division multiplexing (O-OFDM) signal. proposed scheme,...
A single-measurement sweep-free distributed Brillouin optical time domain analyzer (BOTDA) sensor based on phase detection is proposed and experimentally demonstrated employing digital frequency comb (DOFC) probe signal. Phase Spectrum (BPS) of DOFC induced by interaction measured using coherent in a single acquisition, without any scanning data averaging. Single-measurement BOTDA BPS 10km long fiber with response 100 μs, which limited only the length. The spatial resolution 51.2m,...
A technique is proposed to measure the high-resolution and wide-band characterization of amplitude, phase responses, polarization property optical components. This combines spectrum stitching channel estimation methods. Two kinds fiber Bragg grating based Fabry-Perot cavities with ultrafine structures have been characterized on this technique. By using 1024 point fast Fourier transform a narrow linewidth, wavelength-tunable laser source, frequency resolution ~10 MHz realized an measurement...
We present parallel Schwarz-type domain decomposition preconditioned recycling Krylov subspace methods for the numerical solution of stochastic elliptic problems, whose coefficients are assumed to be a random field with finite variance. Karhunen–Loève (KL) expansion and double orthogonal polynomials used reformulate problem into large number related but uncoupled deterministic equations. The key an efficient algorithm lies in “recycling computed subspaces.” Based on careful analysis KL...
We present a parallel Schwarz type domain decomposition preconditioned recycling Krylov subspace method for the numerical solution of stochastic indefinite elliptic equations with two random coefficients. Karhunen-Loeve expansions are used to represent variables and Galerkin dou- ble orthogonal polynomials is derive sequence uncoupled deterministic equations. show numerically that GMRES an effective technique solving entire family linear systems and, in particular, use recycled subspaces key...
This experiment demonstrated the resonance asymmetry phenomenon in resonant fiber optic gyro. The of curve affects system open-loop bias and its stability, which directly accuracy angular velocity measurement. In this paper, a new mathematic model is established. influence coupler normal mode loss difference (the phase between cross port output optical field direct less than ideal π/2) on symmetry curve, signal modulated by triangular wave, demodulation are analyzed. Moreover, leads to...
As for the control of microgrid, this paper studied multi strategy microgrid based on nonlinear prime dual method. Objective function model is minimization micro sources' cost and purchased power from grid when connected to while satisfying a series constraints. Minimization load shed objective isolated keeps as much possible ensures stable voltage frequency. Simulation done with distributed system. Results indicate that proposed method can ensure stability it or grid. (6 pages)
The periodic small-signal analysis, such as AC (PAC) and noise (PNoise) simulation, has historically been very computationally intensive, particularly when dealing with a large number of frequency points. This paper introduces new iterative approach that utilizes Krylov subspace recycling technology to enable fast large-scale analysis. method involves reusing the generated during solution previous frequencies expedite convergence at subsequent frequencies. Specifically, outlines based on...
An ultra-fast sweep-free distributed BOTDA sensor is proposed and experimentally demonstrated employing coherent de-modulation of digital optical frequency comb (DOFC) probe signal. The phase shift each tone induced during the Stimulated Brillouin Scattering (SBS), corresponding to Phase Spectrum (BPS), simultaneously measured in a single shot without sweeping averaging. We demonstrate an 10km long fiber with measurement time 10 ps, which depending on time-of-flight fiber. minimum detectable...
We propose and experimentally demonstrate a novel scheme of bi-directional Brillouin time domain analyzer (BD-BOTDA) to extend the sensing range. By deploying two pump-probe pairs at different wavelengths, frequency shift (BFS) distribution over each half whole fiber can be obtained with simultaneous detection signals in both channels. Compared conventional unidirectional BOTDA system same range, proposed BD-BOTDA enables distributed performance level comparable one range spatial resolution...
According to the material handling AGV in accurate,timely and flexible requirements, proposed based on Googol GE-400SV motion controller control system. Constructed CPAC core system hardware structure. as for of structure, using VC ++6.0 completed software realization. Experimental results show that: use development can meet design Automated Guided Vehicle precise positionig , automatic walk.
This note deals with the problem of stability for networked control system (NCS) uncertain time-varying delay that is less than on sampling period. A new scheme was proposed. Using an Lyapunov function, conservative sufficient condition derived such based liner matrix inequalities (LMs). Finally a numerical example shows superiority method in this paper.
The camera calibration is an essential part in the machine vision,the to establish relationship between image pixellocation and scene position,the approach based on model,solving model parameters of coordinates world from known feature points. Using method quadratic curve,this article selects a template consists two concentric circles ovals.We shot 4 images different directions,and use combinations three four calibrate camera.Thus we can calculatethe various camera.