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arXiv 2018年

作者： Di, Boya Zhang, Hongliang Song, Lingyang Li, Yonghui Li, Geoffrey Ye State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Beijing China School of Electrical and Information Engineering University of Sydney School of Electrical and Computer Engineering Georgia Institute of Technology United States

In this paper, we propose a terrestrial-satellite network (TSN) architecture to integrate the ultradense low earth orbit (LEO) networks and the terrestrial networks to achieve efficient data offloading. In TSN, each ground user can access the network over C-band via a macro cell, a traditional small cell, or a LEO-backhauled small cell (LSC). Each LSC is then scheduled to upload the received data via multiple satellites over Ka-band. We aim to maximize the sum data rate and the number of accessed users while satisfying the varying backhaul capacity constraints jointly determined by the LEO satellite based backhaul links. The optimization problem is then decomposed into two closely connected subproblems and solved by our proposed matching algorithms. Simulation results show that the integrated network significantly outperforms the non-integrated ones in terms of the sum data rate. The influence of the traffic load and LEO constellation on the system performance is also discussed. Copyright © 2018, The Authors. All rights reserved.

关键词： Orbits

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User-defined quantum key distribution

arXiv

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arXiv 2018年

作者： Li, Zhengyu Zhang, Yichen Guo, Hong State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Center for Quantum Information Technology Center for Computational Science and Engineering Peking University Beijing100871 China Central Research Institute 2012 Labs Huawei Technoligies Co. Ltd Shenzhen Guangdong China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing100876 China

Quantum key distribution (QKD) provides secure keys resistant to code-breaking quantum computers. As headed towards commercial application, it is crucial to guarantee the practical security of QKD systems. However, the difficulty of security proof limits the flexibility of protocol proposals, which may not fulfill with real application requirements. Here we show a protocol design framework that allows one to securely construct the protocol using arbitrary non-orthogonal states. Multi-mode entangled source is virtually introduced for the security analysis, while coherent measurement is used to provide raw data. This ‘arbitrary’ feature reverses the traditional protocol-decide-the-system working style, such that the protocol design now can follow what the system generates. We show a valuable showcase, which not only solves the security challenge of discrete-modulated coherent states, but also achieves high performance with no more than 256 coherent states. Our findings lower the requirement for system venders with off-the-shell devices, thus will promote the commercialization of QKD. Copyright © 2018, The Authors. All rights reserved.

关键词： Quantum cryptography

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Single-drive high-speed lumped depletion-type modulators toward 10 fJ/bit energy consumption

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Photonics Research 2017年第2期5卷 134-142页

作者： XINBAI LI FENGHE YANG FANG ZHONG QINGZHONG DENG JURGEN MICHEL ZHIPING ZHOU State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer SciencePeking University MIT Microphotonics Center Massachusetts Institute of Technology

Reduction of modulator energy consumption to 10 fJ∕bit is essential for the sustainable development of communication *** modulators might be a viable solution if instructed by a complete theory ***,we present a complete analytical electro-optic response theory,energy consumption analysis,and eye diagrams on absolute scales for lumped *** the speed limitation is understood and alleviated by single-drive configuration,and comprehensive knowledge into the energy dependence on structural parameters significantly reduces energy *** results show that silicon modulation energy as low as 80.8 and 21.5 fJ∕bit can be achieved at 28 Gbd under 50 and 10 Ω impedance drivers,respectively.A 50 Gbd modulation is also shown to be *** analytical models can be extended to lumped modulators on other material platforms and offer a promising solution to the current challenges of modulation energy reduction.

关键词： length type high

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Compact, submilliwatt, 2 × 2 silicon thermo-optic switch based on photonic crystal nanobeam cavities

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Photonics Research 2017年第2期5卷 108-112页

作者： HUANYING ZHOU CIYUAN QIU XINHONG JIANG QINGMING ZHU YU HE YONG ZHANG YIKAI SU RICHARD SOREF State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Engineering Department University of Massachusetts

We propose and experimentally demonstrate a 2×2 thermo-optic(TO) crossbar switch implemented by dual photonic crystal nanobeam(PCN)cavities within a silicon-on-insulator(SOI)*** thermally tuning the refractive index of silicon,the resonance wavelength of the PCN cavities can be *** the help of the ultrasmall mode volumes of the PCN cavities,only～0.16 mW power is needed to change the switching *** a spectral passband of 0.09 nm at the 1583.75 nm operation wavelength,the insertion loss(IL)and crosstalk(CT)performances were measured as IL(bar)=-0.2 dB,CT(bar)=-15 dB,IL(cross)=-1.5 dB,and CT(cross)=-15 ***,the thermal tuning efficiency of the fabricated device is as high as1.23 nm/mW.

关键词： PCN Compact silicon thermo-optic switch based on photonic crystal nanobeam cavities submilliwatt mode SOI

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Kernel adaptive filtering for nonlinearity-tolerant optical direct detection systems

arXiv

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arXiv 2018年

作者： Zhang, L. Ozolins, O. Lin, R. Udalcovs, A. Pang, X. Gan, L. Schatz, R. Djupsjöbacka, A. Mårtensson, J. Westergren, U. Tang, M. Fu, S. Liu, D. Tong, W. Popov, S. Jacobsen, G. Hu, W. Xiao, S. Chen, J. KTH Royal Institute of Technology Kista Sweden State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China NETLAB - Networking and Transmission Laboratory RISE AB Kista Sweden Huazhong University of Science and Technology Wuhan China Yangtze Optical Fiber and Cable Joint Stock Limited Company Wuhan China Infinera Fredsborgsgatan 24 Stockholm117 43 Sweden

Kernel adaptive filtering (KAF) is proposed for nonlinearity-tolerant optical direct detection. For 7x128Gbit/s PAM4 transmission over 33.6km 7-core-fiber, KAF only needs 10 equalizer taps to reach KP4-FEC limit (BER@2.2e-4), whereas decision-feedback-equalizer needs 43 equalizer taps to reach HD-FEC limit (BER@3.8e-3). Copyright © 2018, The Authors. All rights reserved.

关键词： Taps

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Digital radio-over-multicore-fiber system with self-homodyne coherent detection and entropy coding for mobile fronthaul

arXiv

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arXiv 2018年

作者： Zhang, Lu Udalcovs, Aleksejs Lin, Rui Ozolins, Oskars Pang, Xiaodan Gan, Lin Schatz, Richard Djupsjöbacka, Anders Mårtensson, Jonas Tang, Ming Fu, Songnian Liu, Deming Tong, Weijun Popov, Sergei Jacobsen, Gunnar Hu, Weisheng 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 NETLAB - Networking and Transmission Laboratory RISE AB Kista Sweden Huazhong University of Science and Technology Wuhan China Yangtze Optical Fiber and Cable Joint Stock Limited Company Wuhan China Infinera Fredsborgsgatan 24 Stockholm117 43 Sweden

We experimentally demonstrate a 28-Gbaud 16-QAM self-homodyne digital radio-over-33.6km-7-core-fiber system with entropy coding for mobile fronthaul, achieving error-free carrier aggregation of 330 100-MHz 4096-QAM 5G-new-radio channels and 921 100-MHz QPSK 5G-new-radio channels with CPRI-equivalent data rate up to 3.73-Tbit/s. Copyright © 2018, The Authors. All rights reserved.

关键词： Digital radio

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Investigation on the dispersion tolerance in dual-drive MZM-based DAC-less optical PAM4 transmission

Investigation on the dispersion tolerance in dual-drive MZM-...

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optical Fiber communication Conference, OFC 2018

作者： Zhang, Kuo Zhuge, Qunbi Xin, Haiyun Xing, Zhenping Li, Rui Xiang, Meng Fan, Sujie Yi, Lilin Hu, Weisheng Plant, David V. State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai200240 China Department of Electrical and Computer Engineering McGill University MontrealQCH3A 2A7 Canada Ciena Corporation OttawaONK2K 0L1 Canada

We investigate the chirp characteristics of the two PAM4 generation methods based on dual-drive MZM. Prominent difference in transmission performance between the two methods is experimentally shown for 112Gb/s PAM4 si... 详细信息

ISBN: (纸本)9781943580385

关键词： Chromatic dispersion

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Practical Pattern Recognition system for Distributed optical Fiber Intrusion Monitoring Based on Ф-COTDR

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ZTE communications 2017年第3期15卷 52-55页

作者： CAO Cong FAN Xinyu LIU Qingwen HE Zuyuan State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong UniversityShanghai 200240China

At present, the demand for perimeter security system is in-creasing greatly, especially for such system based on distribut-ed optical fiber sensing. This paper proposes a perimeter se-curity monitoring system based on phase-sensitive coherentoptical time domain reflectometry(Ф-COTDR) with the practi-cal pattern recognition function. We use fast Fourier trans-form(FFT) to exact features from intrusion events and a multi-class classification algorithm derived from support vector ma-chine(SVM) to work as a pattern recognition technique. Fivedifferent types of events are classified by using a classifica-tion algorithm based on SVM through a three-dimensional fea-ture vector. Moreover, the identification results of the patternrecognition system show that an identification accurate rate of92.62% on average can be achieved.

关键词： fiber optics sensors COTDR distributed vibration sensing SVM pattern recognition

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Linearly interpolation-based almost blind phase noise suppression method for CO-OFDM systems

Linearly interpolation-based almost blind phase noise suppre...

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OptoElectronics and communications Conference, OECC

作者： Zhaopeng Xu Chuanchuan Yang Zhongwei Tan State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing China

In this paper, we improve the pseudo pilot-aided orthogonal basis expansion based (PS-OBE) phase noise suppression method proposed in our recent work by linearly interpolation (LI). The LI-PS-OBE method provides a mor... 详细信息

关键词： Phase noise OFDM Interpolation Adaptive optics optical noise system performance optical transmitters

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Fabrication of depletion type micro-ring modulator with high extinction ratio and high coupling quality factor 3

Fabrication of depletion type micro-ring modulator with high...

引用

3rd International Conference on Mechanical, Electronic and Information Technology Engineering, ICMITE 2017

作者： Shen, Yun Wang, Xiaodong Zhang, Wei Qiu, Ciyuan Cheng, Xiulan Center for Advanced Electronic Material and Devices Shanghai Jiao Tong University Shanghai200240 China State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China

We experimentally demonstrate an optical micro-ring modulator based on a reverse-biased PN junction which is integrated into a silicon-on-insulator (SOI) rib waveguide. The performance of micro-ring resonator with different sizes is simulated with Lumerical MODE Solutions. The fabricated device provides a high extinction ratio (ER) of 20 dB and coupling quality factor (Q) 2∗104. Modulation rate is higher than 11 Gbit/s with only 2 V peak-to-peak (Vpp) driving voltage. The theoretical modulation rate can be higher than 25 Gbit/s by the optimizing the matching resistor and the test system. © The Authors, published by EDP Sciences, 2017.

关键词： Fabrication

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