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100 Gb/s coherent chaotic optical communication over 800 km fiber transmission via advanced digital signal processing

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advanced Photonics Nexus 2024年第1期3卷 20-25页

作者： Yunhao Xie Zhao Yang Mengyue Shi Qunbi Zhuge Weisheng Hu Lilin Yi Shanghai Jiao Tong University School of Electronic Information and Electrical EngineeringState Key Laboratory of Advanced Optical Communication Systems and NetworksShanghaiChina

Chaotic optical communication has shown large potential as a hardware encryption method in the physical *** an important figure of merit,the bit rate–distance product of chaotic optical communication has been continually improved to 30 Gb/s×340 km,but it is still far from the requirement for a deployed optical fiber communication system,which is beyond 100 Gb/s×1000 km.A chaotic carrier can be considered as an analog signal and suffers from fiber channel impairments,limiting the transmission distance of high-speed chaotic optical *** break the limit,we propose and experimentally demonstrate a pilot-based digital signal processing scheme for coherent chaotic optical communication combined with deep-learning-based chaotic *** transmission impairment recovery and chaotic synchronization are realized in the digital *** frequency offset of the lasers is accurately estimated and compensated by determining the location of the pilot tone in the frequency domain,and the equalization and phase noise compensation are jointly performed by the least mean square algorithm through the time domain pilot *** the proposed method,100 Gb∕s chaotically encrypted quadrature phase-shift keying(QPSK)signal over 800 km single-mode fiber(SMF)transmission is experimentally *** order to enhance security,40 Gb∕s real-time chaotically encrypted QPSK signal over 800 km SMF transmission is realized by inserting pilot symbols and tone in a field-programmable gate *** method provides a feasible approach to promote the practical application of chaotic optical communications and guarantees the high security of chaotic encryption.

关键词： chaotic optical communication physical layer security deep learning digital signal processing

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Squint-Aware ISAC Precoding Towards Enhanced Dual-Functional Gain in Sub-Terahertz systems

arXiv

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arXiv 2024年

作者： Yang, Zonghui Gao, Shijian Cheng, Xiang State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing China Guangzhou China

The potential benefits of integrated sensing and communication (ISAC) are anticipated to play a significant role in future sub-terahertz (sub-THz) systems. However, the beam squint effect is pronounced in sub-THz systems, expanding coverage areas while severely degrading communication performance. Existing hybrid precoding designs struggle to balance both functionalities in the presence of beam squint, limiting the performance gain achievable through ISAC. To address this challenge, we propose two squint-aware hybrid precoding schemes for sub-THz systems that proactively regulate the correlation between communication and sensing channels, leveraging the inherent degrees of freedom in the hardware to enhance integrated gain. We introduce a squint-aware optimization-based hybrid precoding algorithm (SA-Opt) and develop an unsupervised learning-assisted complex-valued squint-aware network (CSP-Net) to reduce complexity, tailoring its architecture to the specific data and task characteristics. The effectiveness of the proposed schemes is demonstrated through simulations. Copyright © 2024, The Authors. All rights reserved.

关键词： Terahertz wave detectors

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Dual-Species All-optical Magnetometer Based on a Cs-K Hybrid Vapor Cell

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Physical Review Applied 2023年第3期19卷 034066-034066页

作者： Yudong Ding Wei Xiao Yixin Zhao Teng Wu Xiang Peng Hong Guo State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Center for Quantum Information Technology Peking University Beijing 100871 China

We build and characterize a dual-species all-optical magnetometer based on a Cs-K hybrid vapor cell with a paraffin coating. Using the amplitude-modulated Bell-Bloom scheme and Faraday-rotation measurement, we show that the spin polarization of Cs and K atoms can be generated and detected independently. The noise floor of the Cs channel is 35fT/Hz, whereas that of the K channel is 260fT/Hz, which is affected mainly by the magnetic resonance broadening in the presence of mutual spin-exchange collisions. With use of the proposed device, in situ magnetic field stabilization is realized by use of (i) the K channel to monitor and compensate for the magnetic field noise and (ii) the Cs channel to read out the magnetic field after active stabilization. The low-frequency magnetic field noise can be suppressed by a factor of more than 1000 in the presence of magnetic field gradients. When applied to magnetic field stabilization, such in situ measurement is achieved more compactly and is more accurate than ex situ measurement that is realized with two spatially separated vapor cells. In addition, the proposed scheme could also be applied in a practical ground-surveying magnetometer based on dual working species.

关键词： Magneto-optical spectra Quantum sensing Zeeman effect Alkali metals Atomic gases Magnetic moment Polarization

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Mixed-Precision Integer-Arithmetic-Only Neural Network-Based Equalizers for DML-Based Short-Reach IM/DD systems 49

Mixed-Precision Integer-Arithmetic-Only Neural Network-Based...

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49th European Conference on optical Communications, ECOC 2023

作者： Xu, Zhaopeng Ji, Honglin Yang, Yu Qiao, Gang Wu, Qi Li, Jia Lu, Weiqi Liu, Lulu Wang, Shangcheng Wei, Jinlong He, Zhixue Hu, Weisheng Shieh, William Peng Cheng Laboratory Shenzhen518055 China State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China School of Engineering Westlake University Hangzhou310024 China

ISBN: (纸本)9781839539954

We propose mixed-precision integer-Arithmetic-only NNs for low-complexity equalization in a 50-Gb/s 25-km DML-based PAM4 IM/DD link based on input neuron partitioning. The proposed scheme avoids floating-point weight operations and saves 26.3% memory at a minimum NN size compared with fixed-precision quantization counterpart without degrading BER. © The Institution of Engineering & Technology 2023.

关键词： Mixed-integer linear programming

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Low-loss Zero-index Waveguides and Devices

Low-loss Zero-index Waveguides and Devices

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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Dong, Tian Dai, Tianxiang Chen, Ye Liu, Yueyang Liu, Hancheng Wang, Yiting Ma, Anqi Hu, Haifeng Xu, Lihua Zhao, Le Chu, Weiguo Peng, Chao Wang, Jianwei Li, Yang State Key Laboratory of Precision Measurement Technology and Instrument Department of Precision Instrument Tsinghua University Beijing100084 China State Key Laboratory for Mesoscopic Physics School of Physics Peking University Beijing100871 China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics Frontiers Science Center for Nano-optoelectronics Peking University Beijing100871 China Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University Beijing100191 China Nanofabrication Laboratory National Center for Nanoscience and Technology Beijing100190 China

We report flexible zero-index waveguides and devices whose loss is two orders of magnitude lower than the state of the art, enabling phase-error-free high-dense photonic integrated circuits for classical and quantum i... 详细信息

关键词： Photonic integrated circuits

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Dispersion Characterization of Dielectric Two-Dimensional Photonic Band Gap

Dispersion Characterization of Dielectric Two-Dimensional Ph...

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International Conference on Microwave and Millimeter Wave Technology Proceedings

作者： Yu-Lu Lei Zi-Wen Zhang Chao-Hai Du Center for Carbon-based Electronics State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University

ISBN: (数字)9798350389968

ISBN: (纸本)9798350389975

Dielectric photonic crystals, characterized by periodic refractive index modulation, give rise to photonic band gaps (PBGs), offering a novel avenue for controlling the propagation of electromagnetic waves. In this study, we aim to investigate the correlation between the ratio of the lattice constant to the rod radius and the PBG. Employing the Finite-Difference Frequency-Domain method, we calculate the dispersions along the boundary of the irreducible Brillouin zone, which are visually presented in the figures. This exploration promises to introduce a completely new degree of freedom for the manipulation of light or electromagnetic wave propagation.

关键词： Photonic band gap Two-dimensional displays Millimeter wave technology Lattices Modulation Refractive index Millimeter wave propagation

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Low-modal-crosstalk doped-fiber amplifiers in few-mode-fiber-based systems

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Photonics Research 2024年第8期12卷 1768-1775页

作者： SHUAILUO HUANG LEI SHEN GANG QIAO YUANPENG DING YUYANG GAO JIAN CUI BAOLONG ZHU SIYUAN LIU MINGQING ZUO JINGLONG ZHU LEI ZHANG JIE LUO YONGQI HE ZHANGYUAN CHEN JUHAO LI State Key Laboratory of Advanced Optical Communication Systems and Networks Peking UniversityBeijing 100871China State Key Laboratory of Optical Fiber and Cable Manufacture Technology Yangtze Optical Fibre and Cable Joint Stock Limited CompanyWuhan 430073China School of Computer and Communication Engineering University of Science and Technology BeijingBeijing 100083China Department of Networks China Mobile Communications Group Co.Ltd.Beijing 100033China Department of Fundamental Network Technology China Mobile Research InstituteBeijing 100053China Pengcheng Laboratory Shenzhen 518055China

Independent light propagation through one or multiple modes is commonly considered as a basic demand for mode manipulation in few-mode fiber(FMF)-or multimode fiber(MMF)-based optical systems such as transmission links,optical fiber lasers,or distributed optical fiber ***,the insertion of doped-fiber amplifiers always kills the entire effort by inducing significant modal *** this paper,we propose the design of doped-fiber amplifiers in FMF-based systems adopting identical multiple-ring-core(MRC)index profiles for both passive and doped fibers to achieve low modal *** develop the direct-glass-transition(DGT)modified chemical vapor deposition(MCVD)processing for precise fabrication of few-mode erbium-doped fibers(FM-EDFs)with MRC profiles of both refractive index and erbium-ion doping ***,a few-mode erbium-doped-fiber amplifier(FM-EDFA)with a maximum gain of 26.08 dB and differential modal gain(DMG)of 2.3 dB is realized based on fabricated FM-EDF matched with a transmission FMF supporting four linearly polarized(LP)*** the insertion of the FM-EDFA,60+60 km simultaneous LP_(01)∕LP_(11)∕LP_(21)∕LP_(02)transmission without inter-modal multiple-input multiple-output digital signal processing(MIMO-DSP)is successfully *** proposed design of low-modal-crosstalk doped-fiber amplifiers provides,to our knowledge,new insights into mode manipulation methods in various applications.

关键词： fiber crosstalk amplifiers

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Secure encryption system based on quantum access network 4

Secure encryption system based on quantum access network

引用

4th International Computational Imaging Conference, CITA 2024

作者： Liu, Yuchao Wang, Tao Xu, Yuehan Zeng, Guihua State Key Laboratory of Advanced Optical Communication Systems and Networks Center of Quantum Sensing and Information Processing Shanghai Jiao Tong University Shanghai200240 China Shanghai Research Center for Quantum Sciences Shanghai201315 China Hefei National Laboratory CAS Center for Excellence in Quantum Information and Quantum Physics Hefei230026 China

ISBN: (纸本)9781510688834

Quantum secure communication technology, grounded in the principles of quantum mechanics, has revolutionized traditional cryptographic methods, which predominantly rely on mathematical algorithms and logical transformations. Quantum key distribution (QKD) facilitates the secure sharing of symmetric keys between legitimate parties, ensuring the integrity and confidentiality of information in communication channels. Among various QKD schemes, continuous variable quantum key distribution (CV-QKD) has emerged as a viable alternative to the more established discrete variable quantum key distribution (DV-QKD). CV-QKD boasts several advantages, including straightforward deployment, reduced operational costs, and stable signal quality, positioning it as a significant component of the quantum communication *** noise stream cipher (QNSC) represents a technique that employs redundant data streams to encrypt plaintext. Notably, QNSC shares structural similarities with the optical path used in quantum key distribution, allowing for compatibility with existing QKD infrastructure. Furthermore, the keys generated through quantum key distribution ensure absolute security, enabling them to substitute the data streams produced by pseudo-random sequences traditionally used in classical encryption schemes. This substitution enhances the overall security framework of the quantum noise stream encryption *** quantum access network (QAN) extends quantum key distribution capabilities from point-to-point connections to point-to-multipoint configurations, thereby becoming an essential component of contemporary network architectures. By interlinking multiple end users with a network backbone, quantum access networks can seamlessly integrate with quantum key distribution protocols. This integration offers a cost-effective and scalable solution for user access to the *** experimental verifications have demonstrated the viability of downstream access networks,

关键词： Quantum noise

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Protection of optical channels and non-classical sources using dynamic modulation

Protection of optical channels and non-classical sources usi...

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CLEO: Science and Innovations in CLEO 2024, CLEO: S and I 2024 - Part of Conference on Lasers and Electro-Optics

作者： Jiang, Ze-Kun Wang, Li Wang, Chang-Shun Solntsev, Alexander S. Jin, Xian-Min School of Physics and Astronomy State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Anhui Hefei230026 China School of Physics and Astronomy State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China School of Mathematical and Physical Sciences University of Technology Sydney UltimoNSW Australia TuringQ Co. Ltd. Shanghai200240 China

A method for protecting optical channels and non-classical sources in integrated photonic systems using dynamic modulation is proposed, which provides higher design freedom and scalability than topological protection ... 详细信息

关键词： Photonic integrated circuits

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Protection of optical channels and non-classical sources using dynamic modulation

Protection of optical channels and non-classical sources usi...

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2024 Conference on Lasers and Electro-Optics, CLEO 2024

ISBN: (纸本)9781957171395

关键词： Signal modulation

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