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Dive into the research topics where Yangan Zhang is active.

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Featured researches published by Yangan Zhang.


european conference on optical communication | 2010

Transmission of 112Gb/s PM-RZ-DQPSK over 960 km with adaptive polarization tracking based on power difference

Jinnan Zhang; Xueguang Yuan; Mi Lin; Tao Jinjing; Yangan Zhang; Minglun Zhang; Xiaoguang Zhang

All-optic scheme for polarization multiplexed system de-multiplexing were implemented with high-speed and precise optical polarization tracking based on power difference. Stable polarization demultiplexing with 800rad/s polarization scrambling for 112Gb/s direct detection PM-RZ-DQPSK transmission over 960km was demonstrated.


Optics Express | 2010

Mathematic models for a ray tracing method and its applications in wireless optical communications.

Minglun Zhang; Yangan Zhang; Xueguang Yuan; Jinnan Zhang

This paper presents a new ray tracing method, which contains a whole set of mathematic models, and its validity is verified by simulations. In addition, both theoretical analysis and simulation results show that the computational complexity of the method is much lower than that of previous ones. Therefore, the method can be used to rapidly calculate the impulse response of wireless optical channels for complicated systems.


international conference on transparent optical networks | 2009

A novel bidirectional RSOA based WDM-PON with downstream DPSK and upstream re-modulated OOK data

Jinnan Zhang; Xueguang Yuan; Yue Gu; Yongqing Huang; Minglun Zhang; Yangan Zhang

We propose a bidirectional reflective semiconductor optical amplifier (RSOA) based wavelength-division-multiplexing passive optical network (WDM-PON) utilizing a differential phase shift keying (DPSK) signal for down-link and an on-off keying (OOK) signal re-modulated for up-link with high extinction-ratio in both directions. A 20 km range colorless WDM-PON without dispersion compensation was demonstrated within low penalty for both 10 Gbit/s downstream and 5 Gbit/s upstream signals. We investigate the impacts of wavelength and the injection power to the RSOA on upstream data. The BER performances of our scheme show that the performance of our scheme is as good as those in case of continuous wave (CW) light injected RSOA. So our scheme is a practical solution to meet the data rate and cost-efficient of the optical links simultaneously in tomorrows WDM-PON access networks.


international conference on transparent optical networks | 2010

Stable 112-Gb/s POLMUX-DQPSK transmission with automatic polarization tracker

Jinnan Zhang; Xueguang Yuan; Mi Lin; Jinjing Tao; Yangan Zhang; Minglun Zhang; Xiaoguang Zhang

The high growth in network bandwidth drives the need to scale DWDM networks and to transport 100GbE signals over existing fiber plants. Polarization-multiplexed return-to-zero differential quadrature phase shift keying (PM-RZ-DQPSK), combined with direct detection and PMD tracker has been considered as a promising solution. In this paper, PM-RZ-DQPSK signals were implemented with high-speed and precise optical polarization compensation. Stable polarization demultiplexing for 800 rad/s polarization scrambling combined with 112 Gb/s direct detection PM-RZ-DQPSK transmission over 960 km was demonstrated.


2009 14th OptoElectronics and Communications Conference | 2009

A high-speed adaptive PMD compensation scheme based on DSP using DPSO algorithm

Jinnan Zhang; Xueguang Yuan; Yangan Zhang; Minglun Zhang; Xiaoguang Zhang

This paper describes implementation of a DSP for adaptive PMD compensation in 80Gbits/s DQPSK optical fiber communication systems. Using dithering particle swarm optimization (DPSO) algorithm, the searching process and tracking process could be completed in 10ms and 1ms respectively.


asia communications and photonics conference and exhibition | 2011

Visible light communications using blind equalization

Boyuan Jin; Minglun Zhang; Yangan Zhang; Ning Hao

White light-emitting diodes (LEDs) are becoming widely used in both illumination and communication applications. In this paper, a visible light communication system is described, which employs blind equalization schemes at the receiver. The blind equalization schemes can both improve the data transmission bandwidth significantly and compensate the signal distortion dynamically. Off-line analysis shows the eye-diagram is observably improved at 10 Mb/s operations using 1 MHz bandwidth white-light LED.


international conference on optical internet | 2014

Design of an FPGA based visible light communication system

Yinjie Jia; Minglun Zhang; Yongqing Huang; Yangan Zhang

Visible light communication (VLC) has won much attention in recent years. In this work a visible light communication system based on IEEE 802.3 standard Media Access Control (MAC) layer is presented. The digital signal processing module of the physical (PHY) layer is implemented in FPGA (Field Programmable Gate Array). The PHY layer is connected to the MAC layer via a Media Independent Interface (MII) which has been specified in IEEE 802.3 standard. The digital part of the system is tested by a Streaming Media Server system. Maximum data rate of 30 Mb/s is achieved.


international conference on communications | 2012

An OOK based visible light communication system for short distance

Ning Hao; Minglun Zhang; Yangan Zhang

An OOK based visible light communication system was developed without the use of blue filter, pre-distortion, and equalization techniques in order to decrease size and lower cost. The transmitter consists of a pattern generator, Bias-Tee, a power supply, and an illuminating LED. The receiver is comprised of a PD, a preamplifier, a clock and a data recovery (CDR) unit. A transmission rate of 10Mbps with 0 BER has been achieved without the above techniques and 25Mbps with 0 BER using a blue filter in front of the PD.


conference on lasers and electro optics | 2009

An automatic PMD compensation scheme utilizing DPSO algorithm in 80Gbits/s DQPSK system

Jinnan Zhang; Yue Gu; Xueguang Yuan; Xiaoguang Zhang; Yangan Zhang; Minglun Zhang

An implementation of atuomatic PMD compensation in 80Gbits/s DQPSK optical fiber communication systems is demonstrated in this paper. The dithering particle swarm optimization (DPSO) algorithm showed powerful ability of fast searching global optimum without being trapped into sub-optima.


Optical Engineering | 2013

Slope value detection-based ditherless bias control technique for Mach–Zehnder modulator

Yupeng Li; Yangan Zhang; Yongqing Huang

Abstract. A new simple bias control scheme for Mach–Zehnder modulator is proposed. Its effectiveness is demonstrated with simulations and experiments. The results showed that this is an effective ditherless bias control technique suitable for a variety of modulation formats. The system bit error rate performance has been observed for 72 h without degradation.

Collaboration


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Jinnan Zhang

Beijing University of Posts and Telecommunications

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Xueguang Yuan

Beijing University of Posts and Telecommunications

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Minglun Zhang

Beijing University of Posts and Telecommunications

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Yongqing Huang

Beijing University of Posts and Telecommunications

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Xiaoguang Zhang

Beijing University of Posts and Telecommunications

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Mi Lin

Beijing University of Posts and Telecommunications

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Jinjing Tao

Beijing University of Posts and Telecommunications

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Liming Zhou

Beijing University of Posts and Telecommunications

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Gai Wang

Beijing University of Posts and Telecommunications

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Yupeng Li

Beijing University of Posts and Telecommunications

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