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Real-Time Post-Processing for Physical-Layer Secure key Distribution in Fiber networks

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SSRN

SSRN 2022年

作者： Cao, Ying Zhang, Liuming Huang, Xinran Hu, Weisheng Yang, Xuelin State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China

Physical-layer secure key distribution (PLSKD) provides robust security and full compatibility with current fiber infrastructure. The post-processing is generally required to improve the key consistency, security, and randomness in PLSKD. However, offline digital signal processing was generally adopted in the previous PLSKD schemes, while the real-time post-processing is necessary towards the practical PLSKD applications. In this paper, a real-time pipeline post-processing is designed and demonstrated using field-programmable gate array (FPGA) boards. A complete set of post-processing is applied, including: double-threshold quantization, information reconciliation with Bose-Chaudhuri-Hocquenghem code, and privacy amplification with SM3 hash algorithm. The system architecture is detailed by combining all these processing steps, where the trade-offs for the post-processing scheme are analyzed. We also assess the performance of post-processing implementation on FPGA in terms of throughput and hardware resource utilization. On the FPGA platform, the final key rate is up to 12.2 Mb/s. The proposed real-time post-processing FPGA prototype is a good candidate for the practical application of PLSKD in fiber networks. © 2022, The Authors. All rights reserved.

关键词： Field programmable gate arrays (FPGA)

Building a digital twin of EDFA: a grey-box modeling approach

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arXiv 2023年

作者： Liu, Yichen Liu, Xiaomin Zhang, Yihao Cai, Meng Fu, Mengfan Zhong, Xueying Yi, Lilin Hu, Weisheng Zhuge, Qunbi State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China Peng Cheng Laboratory Shenzhen518000 China

To enable intelligent and self-driving optical networks, high-accuracy physical layer models are required. The dynamic wavelength-dependent gain effects of non-constant-pump erbium-doped fiber amplifiers (EDFAs) remain a crucial problem in terms of modeling, as it determines optical-to-signal noise ratio as well as the magnitude of fiber nonlinearities. Black-box data-driven models have been widely studied, but it requires a large size of data for training and suffers from poor generalizability. In this paper, we derive the gain spectra of EDFAs as a simple univariable linear function, and then based on it we propose a grey-box EDFA gain modeling scheme. Experimental results show that for both automatic gain control (AGC) and automatic power control (APC) EDFAs, our model built with 8 data samples can achieve better performance than the neural network (NN) based model built with 900 data samples, which means the required data size for modeling can be reduced by at least two orders of magnitude. Moreover, in the experiment the proposed model demonstrates superior generalizability to unseen scenarios since it is based on the underlying physics of EDFAs. The results indicate that building a customized digital twin of each EDFA in optical networks become feasible, which is essential especially for next generation multi-band network operations. Copyright © 2023, The Authors. All rights reserved.

关键词： Erbium doped fiber amplifiers

On-chip source-device-independent quantum random number generator

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Photonics Research 2024年第7期12卷 1379-1394页

作者： LANG LI MINGLU CAI TAO WANG ZICONG TAN PENG HUANG KAN WU GUIHUA ZENG State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China Institute of Quantum Sensing and Information Processing School of Sensing Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum Sciences Hefei National LaboratoryShanghai 201315China Shanghai Xun Tai Quantech Co. Ltd.Shanghai 200241China

Quantum resources offer intrinsic randomness that is valuable for applications such as cryptography, scientific simulation, and computing. Silicon-based photonics chips present an excellent platform for the cost-effective deployment of next-generation quantum systems on a large scale, even at room temperature. Nevertheless,the potential susceptibility of these chips to hacker control poses a challenge in ensuring security for on-chip quantum random number generation, which is crucial for enabling extensive utilization of quantum resources.

关键词： temperature quantum random

Holographic Integrated Sensing and communications: Principles, Technology, and Implementation

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arXiv 2022年

作者： Zhang, Haobo Zhang, Hongliang Di, Boya Song, Lingyang State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing100871 China

Integrated sensing and communication (ISAC) has attracted much attention as a promising approach to alleviate spectrum congestion. However, traditional ISAC systems rely on phased arrays to provide high spatial diversity, where enormous power-consuming components such as phase shifters are used, leading to the high power consumption of the system. In this article, we introduce holographic ISAC, a new paradigm to enable high spatial diversity with low power consumption by using reconfigurable holographic surfaces (RHSs), which is an innovative type of planar antenna with densely deployed metamaterial elements. We first introduce the hardware structure and working principle of the RHS and then propose a novel holographic beamforming scheme for ISAC. Moreover, we build an RHS-enabled hardware prototype for ISAC and evaluate the system performance in the built prototype. Simulation and experimental results verify the feasibility of holographic ISAC and reveal the great potential of the RHS for reducing power consumption. Furthermore, future research directions and key challenges related to holographic ISAC are discussed. Copyright © 2022, The Authors. All rights reserved.

关键词： Beamforming

Co-GRU Enhanced End-to-End Design for Long-haul Coherent Transmission systems

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arXiv 2023年

作者： Zheng, Jiayu Zhang, Tianhong Wenjing, Yu Zhou, Weiqin Yang, Chuanchuan Zhang, Fan The State Key Laboratory of Advanced Optical Communication System and Networks Frontiers Science Center for Nano-optoelectronics Department of Electronics Peking University Beijing100871 China Peng Cheng Laboratory Shenzhen518055 China ZTE Corporation Shenzhen518057 China

In recent years, the end-to-end (E2E) scheme based on deep learning (DL) has been proposed as a potential scheme to jointly optimize the encoder and the decoder parameters of the optical communication system. Compared with conventional deep neural network (DNN) adopted in E2E design, center-oriented Gated Recurrent Unit (Co-GRU) network has the ability to learn and compensate for inter-symbol interference (ISI) with low computation cost while satisfying the gradient backpropagation (BP) condition. In this paper, the Co-GRU structure is adopted for both channel modeling and decoder implementation in E2E design for long-haul coherent wavelength division multiplexing (WDM) transmission systems, which can enhance the performance of general mutual information (GMI) and Q2-factor. For the E2E system with Co-GRU based decoder, the gain of GMI and Q2-factor are respectively improved 0.2 bits/sym and 0.48dB, compared to that of the conventional QAM system, for a 5-channel dual-polarization coherent system transmitting over 960km standard single mode fiber (SSMF). This work paves the way for further study of the application of the Co-GRU structure for both the data-driven channel modeling and the decoder performance improvement in E2E design. Copyright © 2023, The Authors. All rights reserved.

关键词： Backpropagation

High-performance III-V/Si3N4 O-band External Cavity Tunable Laser

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High-performance III-V/Si3N4 O-band External Cavity Tunable ...

CLEO: Science and Innovations, S and I 2022

作者： Guo, Yuyao Li, Xinhang Jin, Minhui Liu, Chuxin Xu, Weihan Lu, Liangjun Xie, Jingya Chen, Jianping Zhou, Linjie State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China SJTU-Pinghu Institute of Intelligent Optoelectronics Pinghu314200 China Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation Center Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology Shanghai200093 China

We present a III-V/Si3N4 O-band hybrid laser, which shows a high output power of 42 mW, wide tuning range of 62 nm with side-mode suppression ratio >50 dB, and narrow intrinsic linewidth of ~600 Hz. © Optica P...

ISBN: (纸本)9781557528209

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Ultrathin All-Angle Hyperbolic Metasurface Retroreflectors Based on Directed Routing of Canalized Plasmonics

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arXiv 2022年

作者： Yin, Li-Zheng Zhao, Jin Chong, Ming-Zhe Han, Feng-Yuan Liu, Pu-Kun State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing100871 China

Retroreflectors that can accurately redirect the incident waves in free space back along their original channels provide unprecedented opportunities for light manipulation. However, to the best of our knowledge, they are suffering from either bulky size, narrow angular bandwidths, or time-consuming post-processing, which essentially limits their further applications. Here, a scheme for designing ultrathin all-angle real-time retroreflectors based on hyperbolic plasmonic metasurfaces is proposed and experimentally demonstrated. The physical mechanism underlying the scheme is the high-efficiency all-angle transition between the traveling waves in free space and the canalized spoof surface plasmon on the hyperbolic plasmonic metasurfaces. In this case, the strong confinement characteristic benefited from the enhanced light-matter interaction enables us to route and retroreflect the canalized spoof surface plasmon with extremely thin structures. As proof of the scheme, a retroreflector prototype with a thickness approximately equal to the central wavelength is designed and fabricated. Further experimental investigation obtains a half-power field of view up to 53° and a maximum efficiency of 83.2%. This scheme can find promising applications in target detection, remote sensing, and diverse on-chip light control devices. Copyright © 2022, The Authors. All rights reserved.

关键词： Efficiency

On 1-Persistent Retransmission in Grant-free Access for URLLC Service

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arXiv 2022年

作者： Hong, Dannan Ye, Tong The State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China

Ultra-reliable and low-latency communication (URLLC) is one of three major application scenarios of the 5G new radio, which has strict latency and reliability requirements. Contention-based grant-free (GF) access protocols, such as Reactive, K-Repetition, and Proactive, have been proposed for uplink URLLC service. In the GF access, user equipment (UE) resends packet immediately after an unsuccessful transmission such that the latency requirement can be satisfied. Taking Reactive as an example, this paper studies the impact of 1-persistent retransmission (1-pR) on the distribution of user-plane delay. We define the number of UEs that try to send packets in each mini-slot as attempt rate. We show that the 1-pR makes the attempt rate seen by the packet in retransmission larger than that seen by the packet in the first transmission. As a result, the successful probability of retransmission is lower than that of the first transmission. Based on this observation, we derive the distribution of user-plane delay, which also takes into account the delay incurred by queueing process. We demonstrate that whether to include the effect of 1-pR and queueing process in the analysis would have a significant impact on the prediction accuracy of delay distribution. Copyright © 2022, The Authors. All rights reserved.

关键词： 5G mobile communication systems

Multi-target Detection for Reconfigurable Holographic Surfaces Enabled Radar

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Multi-target Detection for Reconfigurable Holographic Surfac...

IEEE Conference on Global communications (GLOBECOM)

作者： Xiaoyu Zhang Haobo Zhang Ruoqi Deng Liang Liu Boya Di State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China The Hong Kong Polytechnic University Hong Kong SAR China

Multi-target detection is one of the primary tasks in radar-based localization and sensing, typically built on phased array antennas. However, the bulky hardware in the phased array restricts its potential for enhancing detection accuracy, since the cost and power of the phased array can become unaffordable as its physical aperture scales up to pursue higher beam shaping capabilities. To resolve this issue, we propose a radar system enabled by reconfigurable holographic surfaces (RHSs), a novel meta-surface antenna composed of meta-material elements with cost-effective and power-efficient hardware, which performs multi-target detection in an adaptive manner. Different from the phase-control structure in the phased array, the RHS is able to apply beamforming by controlling the radiation amplitudes of its elements. Consequently, traditional beamforming schemes designed for phased arrays cannot be directly applied to RHSs due to this structural difference. To tackle this challenge, a wave-form and amplitude optimization algorithm (WAOA) is designed to jointly optimize the radar waveform and RHS amplitudes in order to improve the detection accuracy. Simulation results reveal that the proposed RHS-enabled radar increases the probability of detection by 0.13 compared to phased array radars when six iterations of adaptive detection are performed given the same hardware cost.

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