Jinjing Tao

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

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.

A Novel Modulation Scheme of PS-RZ-QPSK Signal in High-speed Optical Transmission System

A novel modulation scheme of PS-RZ-QPSK signal is proposed in this paper. The scheme reduces transmitter cost by less use of Mach-Zehnder modulator, but also presents similar performance as traditional structure for PS-RZ-QPSK. The simulate result indicates PS-RZ-QPSK can achieve a better transmission performance than DP-RZ-QPSK at the same bit rate (84Gb/s) and baud rate (28GBd), and proves showing the feasibility of novel modulation scheme.

The QPSK Modulated Atmospheric Optical Communication System in Atmospheric Turbulence

The performance of the atmospheric optical communication system employing quadrature phase-shift keying (QPSK) modulation format over atmospheric turbulence channels was experimentally investigated in this paper.

A Novel Structure of 4-PolSK System Using on Free-Space Optical Communications

Compared to 2-PolSK, M-PolSK can raise transmission efficiency, but using Stokes parameters receiver increases the complexity of entire system. A novel structure of 4-PolSK without using Stokes parameters receiver is proposed in this paper.

A Novel High Efficient Implement of LDPC on FPGA

In this paper we propose a novel, high efficient fully programmable FPGA encoder architecture to the π-rotation LDPC. The results shows that this method is practicable and with less resource consumption.

Transmission of 240 Gbit/s PM-DQP-ASK over 288 km in 10 Gbit/s NRZ-OOK WDM system

We demonstrated 40 Gbaud PM-DQP-ASK and its successful transmission in a 100 GHz-spaced 10 Gbit/s NRZ-OOK WDM system over a 288-km transmission link along with the studies of WDM nonlinear crosstalk.

Transmission of 120 Gbit/s PM-DQP-ASK over 768 km in 10 Gbit/s NRZ-OOK WDM System

PM-DQP-ASK is a promising technique to achieve bit rates greater than 100Gbit/s and high spectral efficiency, both essential for future optical networks.We demonstrated 20 Gbaud PM-DQP-ASK and its successful transmission in a 100 GHz-spaced 10 Gbit/s NRZ-OOK WDM systems over a 768-km transmission link along with the studies of WDM nonlinear crosstalk.

An application of coherent receiving system to atmospheric laser communication

A novel scheme that employing the coherent receiver in atmospheric laser communication system was proposed in this paper. DPSK format modulation is adopted to overcome atmospheric turbulence and multipath fading. Coherent receiver is used to improve systems sensitivity. Testing bed was setup and eye diagram can be measured. Real time BER would be measured soon.

An Application of DSP and CPLD Based Platform to Adaptive PMD Compensation

In high-speed optical transmission communication systems PMD compensation is crucial and it is challenging to establish an efficient compensator. We demonstrate an optical polarization mode compensation (PMC) system with logical controlling unit based on DSP and CPLD platform. The PMD compensation platform we designed implements with some high-speed control components which shorten the compensation time to nearly 100 microseconds per loop. Utilizing the particle swarm optimization (PSO) algorithm the whole system could complete the first-stage and second-stage PMD compensation.

Adaptive PMD compensation based on DSP and CPLD platform in 80Gb/s DQPSK optical transmission system

Polarization mode dispersion (PMD) causes time and channel dependent pulse distortions in high-speed optical fiber communication systems and limits their transmission capacity. We designed a low power-consume DSP-based integrated control system using the particle swarm optimization (PSO) algorithm to complete first-order PMD and second-order PMD compensation. The experiment results showed that the compensation time was shortened sharply with our compensation scheme.