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Decision-free radius-directed Kalman filter for universal polarization demultiplexing of square M-QAM and hybrid QAM signals

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Chinese Optics Letters 2016年第11期14卷 9-13页

作者：杨彦甫张群姚勇曹国亮 Kangping Zhong Xian Zhou Alan Pak Tao Lau Chao Lu Department of Electronic and Information Engineering Shenzhen Graduate SchoolHarbin Institute of Technology Photonics Research Center Department of Electrical EngineeringThe Hong Kong Polytechnic University Photonics Research Center Department of Electronic and Information EngineeringThe Hong Kong Polytechnic University

We propose and experimentally demonstrate a universal and blind polarization-state tracking scheme for M-quadrature amplitude modulation（QAM） signals based on a decision-free radius-directed linear Kalman filter（RD-LKF）.The polarization tracking performance is investigated through simulation and experiments for both quadrature phase-shift keying（QPSK） and 16-QAM *** influence of the filter parameters on the static polarization demultiplexing performance and dynamic tracking capability are discussed via *** optimization strategy of the filter parameters in modulation-format-independent scenarios is proposed and simulations are carried out to evaluate the polarization demultiplexing penalty for QPSK,16 QAM,and hybrid QPSK/16 QAM ***,the proposed decision-free RD-LKF is experimentally compared to the respective algorithms of constant modulus algorithm and multimodulus algorithm for QPSK and 16-QAM and the advantage of ultrafast polarization tracking ability is confirmed.

关键词： coherent communications Metrological instrumentation

Average BER of coherent optical QPSK systems with phase errors over M turbulence channels

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Chinese Optics Letters 2018年第12期16卷 1-5页

作者： Jiashun Hu Zaichen Zhang Liang Wu Jian Dang Guanghao Zhu National Mobile communications Research Laboratory Southeast University School of Electronic Science and Engineering Nanjing University

The average bit-error-rate(BER) performance is studied for a coherent free-space optical communication system employing differentially encoded quadrature phase-shift keying(QPSK) with the Mth-power phase estimation method. A closed-form expression, considering the combined effects of the Málaga(M) turbulence fading, pointing errors, and phase estimation errors, is derived in terms of Meijer’s G function. Numerical and Monte Carlo simulation results are presented to verify the derived expression.

关键词： coherent communications Optical signals Phase estimation Phase noise Quadrature phase shift keying Signal processing

System performance influenced by channel plan for coherent PDM-QPSK/OOK hybrid transmission systems

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Chinese Optics Letters 2012年第B06期10卷 26-28页

作者：易小刚李岩伍剑徐坤洪小斌郭鸿翔林金桐 State Key Laboratory of Information Photonics and Optical Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

The impact of channel occupancies on polarization division multiplexed quadrature phase-shift keying （PDM-QPSK）/on-off keying （OOK） hybrid systems is investigated numerically over a dispersion-managed transmission link. In addition to keep large residual dispersion per span, we find that suitable channel occupancy also help to improve the nonlinear tolerance of such hybrid systems significantly. About 2.4- dBm more nonlinear threshold （NLT） and 75% increase of transmission reach can be obtained under suitable channel plan for 112-Gb/s PDM-QPSK/OOK hybrid systems.

关键词： 060.1660 coherent communications 060.2330 Fiber optics communications 060.4510 Optical communications

The Possibility of Applying Spectral Redundancy in coherent DWDM Systems for Increasing the Data Transmission Rate and Decreasing Nonlinear Effects and Double Rayleigh Scattering with Great Security of Data

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Open Journal of Applied Sciences 2016年第2期6卷 89-94页

作者： Alexander Nekuchaev Sergey Shuteev Moscow State University Moscow Russia

A new method coherent DWDM system has been proposed. Standard method uses 90 wavelengths with channel capacity 100 G, so total capacity amounts to 9 Terabit, optical power is P. New “channel super” (CS) consists of 15 wavelengths, number of CS is 6, so total number of wavelengths is 90 too, total capacity is 6 Terabit, but optical power is 4/15P. Over ULH and EULH markets, standard approach will be forced to reduce the total capacity to 2.4 Terabit with optical power 4/15P as in proposed method. But the new can reach 6 Terabit with the same optical power 4/15P.

关键词： coherent communications Optical Security and Encryption Fiber Optics Links and Subsystems

Spatial Mode-Division Multiplexing for High-Speed Optical coherent Detection Systems

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ZTE communications 2012年第1期10卷 18-22页

作者： William Shieh Abdullah Al Amin Department of Electrical and Electronic Engineering The University of Melbourne

Spatial modedivision multiplexing is emerging as a potential solution to further increasing optical fiber capacity and spectral efficiency. We report a dualmode, dualpolarization transmission method based on modeselective excitation and detection over a twomode fiber. In particular, we present 107 Gbit/s coherent optical OFDM （COOFDM） transmission over a 4.5 km twomode fiber using LP and LP. modes in which mode separation is performed optically.

关键词： coherent communications few-mode fiber mode converter fiber optic components