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arXiv 2018年

作者： Zhang, Lu van Kerrebrouck, Joris Ozolins, Oskars Lin, Rui Pang, Xiaodan Udalcovs, Aleksejs Spiga, Siliva Amann, Markus C. Gan, Lin Tang, Ming Fu, Songnian Schatz, Richard Jacobsen, Gunnar Popov, Sergei Liu, Deming Tong, Weijun Torfs, Guy Bauwelinck, Johan Yin, Xin Xiao, Shilin Chen, Jiajia KTH Royal Institute of Technology Kista Sweden State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China – IDLab University of Ghent – IMEC Gent Belgium Networking and Transmission Laboratory RISE AB Kista Sweden Huazhong University of Science and Technology Wuhan China Walter Schottky Institut Technische Universität München München Germany Yangtze Optical fiber and Cable Joint Stock Limited Company Wuhan China Infinera Fredsborgsgatan 24 Stockholm117 43 Sweden

We experimentally demonstrate a net-rate 503.61-Gbit/s discrete multitone (DMT) transmission over 10-km 7-core fiber with 1.5-µm single mode VCSEL, where low-complexity kernel-recursive-least-squares algorithm is employed for nonlinear channel equalization. Copyright © 2018, The Authors. All rights reserved.

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Spectral efficiency improved 2D-PAM8 trellis coded modulation for short reach optical system

IEEE Photonics Journal

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IEEE Photonics Journal 2017年第4期9卷

作者： Fu, Yan Bi, Meihua Feng, Da Miao, Xin He, Hao Hu, Weisheng State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China College of Communication Engineering Hangzhou Dianzi University Hangzhou310018 China

This paper proposes and demonstrates a 31.25 Gbps two-dimensional eight level pulse amplitude modulation with trellis coded modulation (2D-PAM8-TCM) transmission in intensity modulation and direct detection based short reach system. In this system, the commercial directly modulated laser and photodiode with trans-impedance amplifier (PIN-TIA) with a combined modulation bandwidth of ∼16 GHz are used as transmitter and receiver, respectively. For 2D-PAM8-TCM signals, except for regular 8-state convolutional encoder, both 16-state and 32-state encoders are provided. Considering the coding gain and the complexity of convolutional encoder, the 16-state one is recommended. Moreover, instead of Viterbi decoder, the M-algorithm is utilized at the receiver side to reduce decoder complexity. It is experimentally demonstrated that 2D-PAM8-TCM scheme can achieve 2.5 b per symbol and ∼0.5 dB sensitivity improvement (bit error rate @3.8 × 10-3) over a 20 km standard single mode fiber in comparison with conventional PAM4. Thanks to no additional digital signal processing in receiver side except M-algorithm, this scheme is simple and effective, which can be considered as an attractive technique for future short reach system. © 2017 IEEE.

关键词： Pulse amplitude modulation

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High-Speed PAM4-Based optical SDM Interconnects With Directly Modulated Long-Wavelength VCSEL

arXiv

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arXiv 2018年

作者： van Kerrebrouck, Joris Pang, Xiaodan Ozolins, Oskars Lin, Rui Udalcovs, Aleksejs Zhang, Lu Li, Haolin Spiga, Silvia Amann, Markus-Christian Gan, Lin Tang, Ming Fu, Songnian Schatz, Richard Jacobsen, Gunnar Popov, Sergei Liu, Deming Tong, Weijun Torfs, Guy Bauwelinck, Johan Chen, Jiajia Yin, Xin IEEE Ghent University - imec Department of Information Technology KTH Royal Institute of Technology Kista164 40 Sweden State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University 200240 China MOE International Laboratory for Optical Information Technologies South China Academy of Advanced Optoelectronics South China Normal University KTH Royal Institute of Technology Guangzhou510006 China Huazhong University of Sci&Tech Wuhan China Walter Schottky Institut Technische Universität München Yangtze Optical Fibre and Cable Company Ltd [YOFC Wuhan430073 China

This paper reports the demonstration of high-speed PAM-4 transmission using a 1.5-µm single-mode vertical cavity surface emitting laser (SM-VCSEL) over multicore fiber with 7 cores over different distances. We have successfully generated up to 70 Gbaud 4-level pulse amplitude modulation (PAM-4) signals with a VCSEL in optical back-to-back, and transmitted 50 Gbaud PAM-4 signals over both 1-km dispersion-uncompensated and 10-km dispersion-compensated in each core, enabling a total data throughput of 700 Gbps over the 7-core fiber. Moreover, 56 Gbaud PAM-4 over 1-km has also been shown, whereby unfortunately not all cores provide the required 3.8 × 10−3 bit error rate (BER) for the 7% overhead-hard decision forward error correction (7% OH-HDFEC). The limited bandwidth of the VCSEL and the adverse chromatic dispersion of the fiber are suppressed with pre-equalization based on accurate end-to-end channel characterizations. With a digital post-equalization, BER performance below the 7% OH-HDFEC limit is achieved over all cores. The demonstrated results show a great potential to realize high-capacity and compact short-reach optical interconnects for data centers. Copyright © 2018, The Authors. All rights reserved.

关键词： Pulse amplitude modulation

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Physical-layer OFDM data encryption using chaotic ZCMT precoding matrix

Physical-layer OFDM data encryption using chaotic ZCMT preco...

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International Conference on Transparent optical networks

作者： Han Chen Xuelin Yang Weiqiang Sun Weisheng Hu State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai P.R. China

A novel encryption scheme using chaotic Zadoff-Chu matrix transform (ZCMT) precoding is proposed to improve both of the data security and performances in orthogonal frequency-division multiplexing (OFDM) transmission, where the security is significantly enhanced with a huge key space of ~10 400 provided by hyper digital chaos. The chaotic ZCMT matrix is generated with the reconfigurable parameters and row permutation of ZCMT matrix, both of which are predetermined by a hyper digital chaos. The OFDM data encryption using the chaotic ZCMT precoding effectively reduces the peak-to-average power ratio (PAPR) and consequently improves the OFDM transmission performance, if compared with the traditional OFDM transmission. The significant PAPR reduction is numerically analysed via the autocorrelation and the complementary cumulative distribution function (CCDF).

关键词： Peak to average power ratio Encryption Correlation Precoding Chaos

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Minimizing total blocking by setting optimal guard band in nonlinear Elastic optical networks

Minimizing total blocking by setting optimal guard band in n...

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International Conference on Transparent optical networks

作者： Cao Chen Min Ju Shilin Xiao Fen Zhou Xueling Yang State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai P.R. China CERI-LIA University of Avignon Avignon France

Setting guard band is an important way to mitigate the physical layer impairments like channel interference and cross-talk interference in Elastic optical networks (EONs). The goal of this paper is to study the optimal guard band size against non-linear noise caused by cross channel interferences. Through a classical routing and spectrum assignment algorithm, we investigate the total blocking probability as a function of guard band size. Simulation results demonstrate the inverse impact on Quality of Transmission (QoT) blocking and resource blocking. We also study the optimal guard band under different non-linear interference and available spectrum resource. The results show that, the optimal guard band should be larger for strong non-linear optical networks, and be unchanged for wide available spectrum. The observation can provide an important guidance for the planning of EONs so as to minimize the total blocking probability.

关键词： Interference optical fiber networks Physical layer optical fibers Signal to noise ratio Mathematical model

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Overlapping Coalition Formation Game Based Opportunistic Cooperative Localization Scheme for Wireless networks

Overlapping Coalition Formation Game Based Opportunistic Coo...

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作者： Zhang, Rongqing Zhao, Zijun Cheng, Xiang Yang, Liuqing State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Beijing100080 China Department of Electrical and Computer Engineering Colorado State University Fort CollinsCO80523 United States Research Center for Development Strategy China Electronics Technology Group Corporation Beijing100041 China

Cooperative localization has emerged as a promising technique which can complement or even replace global positioning systems (GPS) in many practical scenarios, such as GPS-denied environments. In this paper, we concentrate on the distributed cooperative localization design. The conventional distributed cooperative localization approaches usually yield high computational complexity and communication overhead, due to the lack of an efficient link selection mechanism. For this purpose, we propose a novel concept named opportunistic cooperative localization, based on which each agent is able to select the most informative links rather than utilize all the possible links in a distributed, self-organized, and self-optimized manner. To achieve effective opportunistic selection, overlapping coalition formation (OCF) game is employed. In addition, we also provide an optimized terminating criterion, based on which the agents will be able to know whether and when they are well localized, and thus can terminate their localization procedure efficiently. Through simulations, we observe that by virtue of the proposed OCF game based opportunistic cooperative localization scheme along with the provided terminating criterion, the limitations of conventional distributed cooperative localization can be alleviated at the cost of negligible performance degradation. © 1972-2012 IEEE.

关键词： Global positioning system

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Low-complexity and Non-iterative SSBI Decomposition and Cancellation Algorithm for SSB Direct Detection system

Low-complexity and Non-iterative SSBI Decomposition and Canc...

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optical Fiber communication Conference, OFC 2016

作者： Wu, Qi Zhu, Yixiao Hu, Weisheng State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai200240 China

We propose a low-complexity and non-iterative SSBI cancellation algorithm operating at the Nyquist sampling rate employing SSBI decomposition followed by sqrt operation, and experimentally validate it in a 58GBaud 16-...

ISBN: (纸本)9781943580071

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Weak Carrier Assisted Phase Retrieval Receiver

Weak Carrier Assisted Phase Retrieval Receiver

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optical Fiber communication Conference, OFC 2016

作者： Wu, Qi Zhu, Yixiao Hu, Weisheng State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai200240 China

ISBN: (纸本)9781943580071

We propose a weak carrier-assisted phase-retrieval receiver to obtain initial phase for modified Gerchberg-Saxton algorithm with fast convergence to realize hardware-efficient, computationally-efficient, and pilot-symbol-free optical field recovery, and compare it with other phase retrieval schemes. © 2022 The Author(s).

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Fast shape matching and retrieval with dynamic angular partition descriptor

Fast shape matching and retrieval with dynamic angular parti...

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IEEE International Workshop on Imaging systems and Techniques (IST)

作者： Pengfei Shi Yongkun Wang Ying Hu Yaohui Jin The State Key Lab of Advanced Optical Communication Systems and Networks China Network & Information Center Shanghai Jiao Tong University Shanghai China

Shape matching and retrieval are fundamental topics in image processing area. With the rapid growing number of images, fast speed in shape matching is necessary, but most methods focus on the retrieval accuracy. In this article, we propose a dynamic angular partition descriptor (DAPD) based on the statistical distribution of the shape contour points, which is scale invariant inherently. DAPD has low computational complexity which enables fast shape matching, and naturally sacrifices a little accuracy in retrieval. However, we leverage the angle sensitivity in the structure of DAPD, which can compensate the loss in accuracy by 4.46% on average. Experiments on several shape databases show that, our descriptor can speed up shape matching by up to 13X, but still retains 91.92% accuracy in the top-4 similar shapes in retrieval tests. Meanwhile, we generate some distorted shapes to verify the robustness of DAPD against rotation and noise.

关键词： Shape Sensitivity Computational complexity Histograms Automobiles Statistical distributions

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Dual-layer efficiency enhancement for future passive optical network

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Science China(Information Sciences) 2016年第2期59卷 172-184页

作者： Yuefeng JI Xiaoxiong WANG Shizong ZHANG Rentao GU Tonglu GUO Zhaozhi GE State Key Lab of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications

Ever-increasing demands on bandwidth compel us to improve the bandwidth utilization of access networks. It is more important to enhance the efficiency of passive optical networks(PON) than other access technologies, as they are the primary solutions to various access scenarios. To satisfy the demands of improved bandwidth efficiency, we propose a dual-layer(data link layer and network layer) efficiency enhancement scheme for future PON system. Under this architecture, a data-link-layer flexible coding scheme is introduced to extend the downstream link throughput, and a network-layer centralized active queue management(AQM) scheme is introduced to increase bandwidth efficiency. Both of these technologies are designed to suit the future centralized cooperative control mode. The results of an experimental demonstration of the network coding PON scheme reveal the efficiency of the proposed architecture. The results of simulations show that the centralized AQM scheme has a positive influence on queuing delay and jitter. To the best of our knowledge, this is the first time that a data link layer mechanism and a network layer policy have been integrated to provide high efficiency and quality of service in access networks.

关键词： passive optical network bandwidth efficiency network coding active queue management centralized control

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