A5101756199- Optical Network Technologies
- Advanced Photonic Communication Systems
- PAPR reduction in OFDM
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Optical Wireless Communication Technologies
- Fault Detection and Control Systems
- Fluid Dynamics Simulations and Interactions
- Structural Analysis and Optimization
- Space Satellite Systems and Control
- Advancements in PLL and VCO Technologies
- Underwater Vehicles and Communication Systems
- Advanced Wireless Communication Techniques
- solar cell performance optimization
- Advanced Fiber Optic Sensors
- Thermal Radiation and Cooling Technologies
- Solar Thermal and Photovoltaic Systems
- Advanced Optical Network Technologies
- Advanced Algorithms and Applications
- Advanced Data Processing Techniques
Beijing University of Posts and Telecommunications
2016-2019
Yanbian University
2013
We propose the broadband mode-selective coupler (MSC) formed with a side-polished six mode fiber (6MF) and tapered small core single-mode (SC-SMF) or an SMF. The MSCs are designed to allow LP 01 in SC-SMF SMF completely couple , 11 21 02 31 12 modes 6MF over wavelength range. phase-matching conditions of satisfied by tapering specific diameters. fibers residual thickness using wheel polishing technique. effective indices measured prism coupling method. provide high ratio purity. High...
In this paper, a pulse-overlapping super-Nyquist (Pol-SN) wavelength-division multiplexing (WDM) scheme is proposed to improve spectral efficiency of coherent optical transmission. scheme, two tributaries polarization-division quadrature phase-shift keying (PDM-QPSK) signals at the transmitter, carried by same wavelength, are grouped together allow for pulse overlapping in time domain. Then, several wavelength channels packed tightly frequency domain form WDM system. At receiver, three...
This paper introduces DFTs-OFDM to the QAM-based quantum noise stream cipher (QNSC) transmission system. Results show that applying can help QNSC improve signal quality.
We compare the performance of sub-symbol-rate sampling for polarization-division-multiplexed quadrature-phase-shift-keying (PDM-QPSK) signals in super-Nyquist wavelength division multiplexing (WDM) system by using quadrature duo-binary (QDB) and four-level poly-binary (4PB) shaping together with maximum likelihood sequence estimation (MLSE). PDM-16QAM is adopted simulation to be compared PDM-QPSK. The numerical simulations show that, a software defined communication system, level number...
Accurate quality of transmission (QoT) estimation has become an essential function for elastic optical networks. This paper investigates the influence inter-channel nonlinear interference (ICNI) on QoT under flexible network configurations. Based modulation format dependent nonlinearity calculation, interfering channel format, spacing, and power is compared analyzed. Numerical results show Gaussian noise (GN) model- based can underestimate Q factor by 3.6 dB ICNI limited systems.
The performance of Quantum Noise Stream Ciphered coherent optical transmission system is investigated under influence laser phase noise. linewidth tolerance QNSC-64QAM lower than QPSK by 3-MHz at OSNR penalty 2-dB.
We demonstrate MDM-based analog fiber-optic link to further increase gain and reduce nonlinearity. Compared with using LP11 mode only in FMF, increases the SFDR by 4.6dB.
We demonstrate QAM-based stream cipher (QSC) for underwater wireless optical communication (UWOC) employing orthogonal frequency division multiplexing (OFDM) Modulation. Experimental results show Q performance using QSC has only 1dB penalty compared to QPSK without encryption.
2.5Gbit/s MDM transmission over 180m two mode fiber is experimentally demonstrated using compact SFP modules without MIMO processing. Compared to single-mode launch conditions, the OSNR requirements for dual-mode increased by 9dB.
We demonstrate the MDM-based analog fiber link to further reduce nonlinearity. When launch power is 18dBm, increases SFDR by 6.6dB compared with using LP <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">01</sub> mode only in FMF.
In order to describe the time-delays and faults on continuous nonlinear descriptor system using T-S fuzzy model, an observer is proposed estimate states, actuator sensor faults. A state feedback controller constructed for compensations. On basic of Lyapunov stability theory, robust fault-tolerant control method ensures closed-loop be even as occur. The can diagnosed estimated in 0.2 seconds. performance design effective simulations.
We propose an enhanced Stokes Space based mode division de-multiplexing algorithm by using S0 layered fitting (SLF) method, which can realize QPSK&16QAM hybrid modulation format in few transmissions. The effectiveness of this method is substantiated through numerical simulations under multiplexed transmission, where the carried each different.
We investigate theoretical limit of coherent optical receiver with liquid nitrogen cooling to reduce thermal noise extremely high sensitivity requirement. The transmission reach is increased by 4-km for unamplified PDM-QPSK/ PDM-16QAM at 28-GBaud.