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Carrier Regeneration in Kramers Kronig system Enabled by Injection Locking for optical Interconnection

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Carrier Regeneration in Kramers Kronig System Enabled by Inj...

IEEE Photonics Conference (IPC)

作者： Xiaoling Zhang Longsheng Li Chen Chen Wei Jin Chongfu Zhang Kun Qiu School of Information and Communication Engineering Zhongshan Institute University of Electronic Science and Technology of China Chengdu China School of Electronic and Information University of Electronic Science and Technology of China Zhongshan Institute Zhongshan China State Key lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China School of Microelectronics and Communication Engineering Chongqing University Chongqing China

We experimentally demonstrate a carrier regeneration technique based on injection locking for optical intra-datacenter interconnection. 56-Gb/s optical SSB-PAM-4 signal with -2-dB power ratio of weak pilot tone to sig... 详细信息

ISBN: (数字)9781728158914

ISBN: (纸本)9781728158921

关键词： optical fibers optical receivers optical filters optical transmitters Amplitude modulation optical modulation

Nonlinear Transmission Performance under Different Wavelength-Mode Allocation Schemes for Weakly-Coupled MDM-WDM Transmission

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Nonlinear Transmission Performance under Different Wavelengt...

Asia communications and Photonics Conference and Exhibition (ACP)

作者： Mingqing Zuo Dawei Ge Yongqi He Zhangyuan Chen Juhao Li Peking University Beijing China State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing China SoC Key Laboratory Peking University Shenzhen Institution Shenzhen China

Based on the theoretical investigation of the nonlinear effects in the weakly-coupled MDM-WDM transmission system, we show by simulation that optimizing wavelength-mode allocation schemes can significantly mitigate no... 详细信息

ISBN: (纸本)9781943580705

关键词： Differential phase shift keying Erbium doped fiber amplifiers Few mode fibers Nonlinear effects optical signals Polarization division multiplexing

144Gb/s Two-Dimensional PAM-6 Trellis Coded Modulation Transmission for Data Center Applications

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144Gb/s Two-Dimensional PAM-6 Trellis Coded Modulation Trans...

Asia communications and Photonics Conference

作者： Pengfei Wang Lei Zhang Fan Yang Yixiao Zhu Fan Zhang State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronics Nano-optoelectronics Frontier Center of the Ministry of Education Peking University Beijing 100871 P. R. China

We experimentally demonstrate 2D PAM-6 TCM transmission and evaluate its performance against that of PAM-4. Up to 144Gb/s (72Gbaud) 2D PAM-6 TCM signal is achieved with prominent power sensitivity gain and BER improve... 详细信息

ISBN: (纸本)9781943580705

关键词： Bit error rate Modulation optical amplifiers Quadrature phase shift keying Signal processing Variable optical attenuators

50-Gb/S Dispersion-Unmanaged DMT Transmission with Injection Locked L0G-Class L.55-μm DML

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50-Gb/S Dispersion-Unmanaged DMT Transmission with Injection...

Conference on Lasers and Electro-Optics (CLEO)

作者： Lei Xue Lilin Yi Lu Zhang Oskars Ozolins Aleksejs Udalcovs Xiaodan Pang Jiajia Chen State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University China KTH Royal Institute of Technology Stockholm Sweden Networking and Transmission Laboratory Stockholm Sweden Infinera Stockholm sweden

We demonstrate 50-Gb/s DMT signal transmission over 20-km SMF by using a 10G-class 1.55-μm DML without optical dispersion compensation. Injection locking technique is introduced, which doubles system bandwidth and gr...

ISBN: (纸本)9781728137186

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Simplified signal processing for high-speed PON

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Simplified signal processing for high-speed PON

Conference on Lasers and Electro-Optics/Pacific Rim, CLEOPR 2018

作者： Yi, Lilin Xue, Lei Hu, Weisheng State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Institute for Advanced Communication and Data Science Shanghai Jiao Tong University Shanghai200240 China

We have experimentally demonstrated symmetric 425 Gb/s TWDM-PON and 50 Gb/s TDM-PON based on 10G class devices. Low-cost DMLs are used as transmitter and simple optical signal process is used for bandwidth equalizatio... 详细信息

ISBN: (纸本)9781943580453

关键词： Passive optical networks

One-time shot-noise unit calibration method for continuous-variable quantum key distribution

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arXiv 2019年

作者： Zhang, Yichen Huang, Yundi Chen, Ziyang Li, Zhengyu Yu, Song Guo, Hong State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics Center for Quantum Information Technology Peking University Beijing100871 China

The shot-noise unit in continuous-variable quantum key distribution plays an important and fundamental role in experimental implementation as it is used as a normalization parameter that contribute to perform security analysis and distill the key information. However, the traditional calibration procedure and detector model can not cover all system noise in practical application, which will result in some loopholes and influence the practical security. What’s more, the traditional procedure is also rather complicated and has difficulty in compatible with automatic operating system. In this paper we propose a calibration model based on the proposed trusted detector model, which could naturally close the loopholes in practical application. It can help identify the shot-noise unit in only one step, which can not only effectively simplify the evaluation process but also reduce the statistical fluctuation, while two steps are needed in traditional method. We prove its feasibility and derive the complete version of the corresponding entanglement-based model. Detailed security analysis against arbitrary collective attacks and numerous simulation results in both the asymptotic limit regime and the finite-size regime are provided. A proof-of-principle experiment has been implemented and the results indicate that the one-time-calibration model can be employed as a powerful substitution to calibrate the shot-noise unit. Our method paves the way for the deployment of continuous-variable quantum key distribution with real time calibration and automatic operation. Copyright © 2019, The Authors. All rights reserved.

关键词： Shot noise

Multiple residual dense networks for reconfigurable intelligent surfaces cascaded channel estimation

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arXiv 2021年

作者： Jin, Yu Zhang, Jiayi Huang, Chongwen Yang, Liang Xiao, Huahua Ai, Bo Wang, Zhiqin The School of Electronic and Information Engineering Beijing Jiaotong University Beijing100044 China The Frontiers Science Center for Smart High-speed Railway System Beijing Jiaotong University Beijing100044 China Zhejiang Provincial Key Lab of Information Processing Communication and Networking Zhejiang University Hangzhou310007 China College of Computer Science and Electronic Engineering Hunan University Changsha410082 China ZTE Corporation State Key Laboratory of Mobile Network Mobile Multimedia Technology Shenzhen518057 China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing100044 China Henan Joint International Research Laboratory of Intelligent Networking and Data Analysis Zhengzhou University Zhengzhou450001 China Research Center of Networks and Communications Peng Cheng Laboratory Shenzhen518055 China China Academy of Information and Communications Technology Beijing100191 China

Reconfigurable intelligent surface (RIS) constitutes an essential and promising paradigm that relies programmable wireless environment and provides capability for space-intensive communications, due to the use of low-cost massive reflecting elements over the entire surfaces of man-made structures. However, accurate channel estimation is a fundamental technical prerequisite to achieve the huge performance gains from RIS. By leveraging the low rank structure of RIS channels, three practical residual neural networks, named convolutional blind denoising network, convolutional denoising generative adversarial networks and multiple residual dense network, are proposed to obtain accurate channel state information, which can reflect the impact of different methods on the estimation performance. Simulation results reveal the evolution direction of these three methods and reveal their superior performance compared with existing benchmark schemes. Copyright © 2021, The Authors. All rights reserved.

关键词： Channel estimation

Continuous-variable quantum key distribution with rateless reconciliation protocol

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arXiv 2019年

作者： Zhou, Chao Wang, Xiangyu Zhang, Yichen Zhang, Zhiguo Yu, Song Guo, Hong State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics Center for Quantum Information Technology Peking University Beijing100871 China

Information reconciliation is crucial for continuous-variable quantum key distribution (CV-QKD) because its performance affects the secret key rate and maximal secure transmission distance. Fixed-rate error correction codes limit the potential applications of the CV-QKD because of the difficulty of optimizing such codes for different low signal-to-noise ratios (SNRs). In this paper, we propose a rateless reconciliation protocol combined multidimensional scheme with Raptor codes that not only maintains the rateless property but also achieves high efficiency in different SNRs using just one degree distribution. It significantly decreases the complexity of optimization and increases the robustness of the system. Using this protocol, the CV-QKD system can operate with the optimal modulation variance which maximizes the secret key rate. Simulation results show that the proposed protocol can achieve reconciliation efficiency of more than 95% within the range of SNR from -20 dB to 0 dB. It also shows that we can obtain a high secret key rate at arbitrary distances in a certain range and achieve a secret key rate of about 5 × 10−4 bits/pulse at a maximum distance of 132 km (corresponding SNR is -20dB) that is higher than previous works. The proposed protocol can maintain high efficient key extraction under the wide range of SNRs and paves the way toward the practical application of CV-QKD systems in flexible scenarios. Copyright © 2019, The Authors. All rights reserved.

关键词： Quantum cryptography

Two-dimensional Thouless pumping of light in photonic moiré lattices

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arXiv 2022年

作者： Wang, Peng Fu, Qidong Peng, Ruihan Kartashov, Yaroslav V. Torner, Lluis Konotop, Vladimir V. Ye, Fangwei State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China ICFO-Institut de Ciencies Fotoniques The Barcelona Institute of Science and Technology Castelldefels Barcelona08860 Spain Institute of Spectroscopy Russian Academy of Sciences Troitsk Moscow108840 Russia Universitat Politecnica de Catalunya Barcelona08034 Spain Departamento de Física Faculdade de Ciências Universidade de Lisboa Campo Grande Ed. C8 Lisboa1749-016 Portugal Centro de Física Teórica e Computacional Faculdade de Ciências Universidade de Lisboa Campo Grande Ed. C8 Lisboa1749-016 Portugal

Continuous and quantized transports are profoundly different. The latter is determined by the global rather than local properties of a system, it exhibits unique topological features, and its ubiquitous nature causes its occurrence in many areas of science. Here we report the first observation of fully-two-dimensional Thouless pumping of light by bulk modes in a purpose-designed tilted moiré lattices imprinted in a photorefractive crystal. Pumping in such unconfined system occurs due to the longitudinal adiabatic and periodic modulation of the refractive index. The topological nature of this phenomenon manifests itself in the magnitude and direction of shift of the beam center-of-mass averaged over one pumping cycle. Our experimental results are supported by systematic numerical simulations in the frames of the continuous Schrödinger equation governing propagation of probe light beam in optically-induced photorefractive moiré lattice. Our system affords a powerful platform for the exploration of topological pumping in tunable commensurate and incommensurate geometries. Copyright © 2022, The Authors. All rights reserved.

关键词： Topology