Yang An Zhang

Adaptive Polarization Mode Dispersion Compensation with DPSO Algorithm

Dithering particle swarm optimization (DPSO) algorithm is introduced into adaptive polarization mode dispersion (PMD) compensation in optical communication system. The DPSO algorithm has the merits of rapid convergence to the global optimum, without being trapped in local sub-optima, and good robustness to noise. How to implement DPSO as a component of a control algorithm in adaptive polarization mode dispersion compensation is described. Performance comparisons between PSO and DPSO were carried out theoretically and experimentally.

The Network Management System of WSS-Styled ROADMs Based on Openflow

This paper presents the design and implementation of an Openflow-based Network Management System. The system consists of GUI, Floodlight Controller and Agent (s), and it enables monitoring, control and management of ROADMs. WSS and OPM are two main modules of a ROADM system. They are connected with an Agent through Protocol of Serial Port, while GUI communicates with Floodlight Controller by Socket Protocol.

Mobile Wireless Network Management System

Mobile Wireless Network Management System provides a new concept in the research of network management. Supported by mobile terminals, the work achieves the mobilization of network management which is of great convenience and efficiency.

BER Performance Analysis of MIMO-CPolSK Using on Free-Space Optical Communications

Enslaved by atmospheric turbulence and transmission power, performance of Free-space Optical Communication (FSO) fluctuates greatly. A new communication system of MIMO-CPolSK combined the MIMO system and CPolSK modulation is proposed in this paper. According to the strength of turbulence, different mathematical models of atmospheric channel are adopted. The BER calculating formula of SISO-CPolSK is proposed at first, then the BER performance of MISO-CPolSK and MIMO-CPolSK system is presented. The result of numerical simulation shows that BER performance is greatly promoted in MIMO system and compared to OOK modulation, the SNR of receiving in CPolSK modulation is reduced about 3dB when the system has the same BER performance under the same condition.

The Design and Implementation of USB Mass Storage and CCID Composite Device

USB disk and UKEY are common applications of USB Mass Storage and CCID protocol and used widely in our daily life, but they are always deployed on different kinds of devices such as USB disk and UKEY. A potential application that integrates the functions of these two protocols into one device is discovered by us. In this way, we can regard a single device as a mass storage and an UKEY as well. According to this discovery, a new Mass Storage and CCID composite device is developed on IS8U192A development board. After this, several tests are made with some test tools to ensure the newly developed device is able to function well and the Mass Storage and CCID protocols are accurately implemented.

Performance Analysis of Coherent Atmospheric Optical Communications with Soft-decision Forward Error Correction

Performance of coherent atmospheric optical communication system with heterodyne detection and LDPC codes was evaluated over atmospheric channel attenuations of which are about 20-30 dB/km. To reduce bit error and enhance the system performance LDPC code was implemented in system. Combining coherent detection and LDPC codes could reduce the received power requirement ~4 dBm at the BER of 10-9.

An application of LDPC code for wireless coherent-light commutation in atmospheric channel

Low Density Parity Check code is more and more taken seriously in high-speed transmission. In this article we represent a LDPC coder and decoder which based on IEEE802.16e and realize the coder and decoder with Virtex-5 FPGA. By using Matlab to make an off-line system simulation, we analyzed and compared the LDPC performance under the different length of code for LDPC coder then analyzed the influence of different iteration to the LDPC BER performance of decoder.

A Low Power Consumption and Energy Saving Solution Applied in Network Management

As the scale of network become larger and larger together with node numbers, the traditional way to manage the network becoming more and more energy-wasting. In order to improve the performance of the network equipment, we figured out a method that can reduce CPU scheduled frequency thus resulting in a decrease in power consumption.

Automatic PMD Compensation Based on GTPSO Algorithm in Optical Fiber Communication Systems

We demonstrate a universal DSP application for adaptive polarization mode compensation (PMD) compensation utilizing GTPSO algorithm in optical transmission systems. An adaptive PMD compensation experiment is implemented in an 80G/s DQPSK system. We designed a low power-consume DSP-based integrated control system to complete first-order PMD and second-order PMD compensation. The searching process and the tracking process for automatic PMD compensation could be completed in less than 10ms and 1ms.

A New Automatic Demultiplexing Method for NRZ-OOK Polarization-Division Multiplexed System

A new automatic optical polarization demultiplexing method for NRZ-OOK polarization division multiplexed (PDM) system is proposed. The detected power differences of both the direct current (DC) and the radio frequency (RF) are used as control signals which are sensitive to the angles between the polarization controller (PC) and the polarization beam splitter (PBS). The characteristics of those control signals are thoroughly analyzed, and the best RF detection window is calculated out through system simulation.