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optical Fiber Sensors, OFS 2018

作者： Liu, Fei Pan, Shulin Xie, Bin Pan, Yong Gu, Lijuan He, Xiangge Yi, Duo Chen, Zhangyuan Zhang, Min State Key Laboratory of Advanced Optical Communication Systems and Networks Peking University Beijing100871 China Institute of Ocean Research Peking University Beijing100871 China Southwest Petroleum University Chengdu610500 China Petro China Xinjiang Oilfield Company Karamay834000 China School of Physics Peking University Beijing100871 China

A reusable fiber-optic microseismic monitoring system is developed and applied in the oilfield. In the field test, 94 microseismic events are successfully captured and fracture caused by hydraulic process is retrieved... 详细信息

ISBN: (纸本)9781943580507

关键词： Microseismic monitoring

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Show, attend and translate: Unpaired multi-domain image-to-image translation with visual attention

arXiv

引用

arXiv 2018年

作者： Zhang, Honglun Chen, Wenqing Tian, Jidong Wang, Yongkun Jin, Yaohui State Key Lab of Advanced Optical Communication System and Network MoE Key Lab of Artificial Intelligence AI Institute Shanghai Jiao Tong University Network and Information Center Shanghai Jiao Tong University

Recently unpaired multi-domain image-to-image translation has attracted great interests and obtained remarkable progress, where a label vector is utilized to indicate multi-domain information. In this paper, we propose SAT (Show, Attend and Translate), an unified and explainable generative adversarial network equipped with visual attention that can perform unpaired image-toimage translation for multiple domains. By introducing an action vector, we treat the original translation tasks as problems of arithmetic addition and subtraction. Visual attention is applied to guarantee that only the regions relevant to the target domains are translated. Extensive experiments on a facial attribute dataset demonstrate the superiority of our approach and we utilize the residual images to better explain what SAT attends when translating images. Copyright © 2018, The Authors. All rights reserved.

关键词： Generative adversarial networks

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Generation of 47 fs Pulses from an Er:Fiber Amplifier

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Chinese Physics Letters 2017年第7期34卷 101-104页

作者：欧尚明刘关玉雷卉张志刚张庆茂 School of Information Optoelectronics Science and Technology South China Normal University Guangzhou 510006 State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing 100871 Guangzhou Research Institute Of O-M-E Technology Guangzhou 510663

We demonstrate a self-starting erbium fiber oscillator-amplifier system based on the nonlinear polarization rota- tion mode-locked mechanism. The direct output pulse from the amplifier is 47fs with an average power of 1.22 W and a repetition rate of 50 MHz, corresponding to a pulse energy of 24 nJ. The full width at half-maximum of the spectrum of the output pulses is approximately 93nm at a central wavelength of 1572nm so that the transform- limited pulse duration is as short as 39 fs. Due to the imperfect dispersion compensation, we compress the pulses to 47fs in this experiment.

关键词： Generation of 47 fs Pulses from an Er:Fiber Amplifier

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High speed information reconciliation for long distance continuous-variable quantum key distribution system

High speed information reconciliation for long distance cont...

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Frontiers in Optics, FiO 2017

We report the experiment realization of high speed information reconciliation for continuous-variable quantum key distribution system with multi-edge LDPC codes based on graphic processing unit where the average speed... 详细信息

ISBN: (纸本)9781943580330

关键词： Graphics processing unit

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Long-distance continuous-variable quantum key distribution using separable Gaussian states

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Physical Review A 2018年第4期98卷 042303-042303页

作者： Jian Zhou Duan Huang Ying Guo School of Information Science and Engineering Central South University Changsha 410083 China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 People's Republic of China

Continuous-variable quantum key distribution (CVQKD) is considered to be an alternative to classical cryptography for secure communication. However, its transmission distance is restricted to metropolitan areas, given that it is affected by the channel excess noise and losses. In this paper, we present a scheme for implementing long-distance CVQKD using separable Gaussian states. This tunable QKD protocol requires separable Gaussian states, which are squeezed and displaced, along with the assistance of classical communication and available linear optics components. This protocol originates from the entanglement of one mode and the auxiliary mode used for distribution, which is first destroyed by local correlated noises and restored subsequently by the interference of the auxiliary mode with the second distant separable correlated mode. The displacement matrix is organized by two six-dimensional vectors and is finally fixed by the separability of the tripartite system. The separability between the ancilla and Alice and Bob's system mitigates the enemy's eavesdropping, leading to tolerating higher excess noise and achieving longer transmission distance.

关键词： Quantum cryptography

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High-Efficiency Broadband Remote RF Signal Down-Conversion Based on Sideband optical Phase-Locked Loop

High-Efficiency Broadband Remote RF Signal Down-Conversion B...

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European Conference on optical communication (ECOC)

作者： Baiyu Li Weilin Xie Wei Wei Daming Han Jiatong Yao Yi Dong State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China School of Optics and Photonics Beijing Institute of Technology Beijing China

We present a broadband remote RF signal down-conversion based on an optical sideband phase-locked loop. High conversion efficiency, stable phase and good SFDR are achieved by using a microwave local oscillator with ha... 详细信息

关键词： optical fibers RF signals Amplitude modulation optical mixing Masers

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Multiplexed inf-nano resolution quasi-static strain sensor based on transient response of Fabry-Perot interferometers 25

Multiplexed inf-nano resolution quasi-static strain sensor b...

引用

25th International Conference on optical Fiber Sensors, OFS 2017

作者： Chen, Jiageng Liu, Qingwen He, Zuyuan State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University 800 Dongchuan Road Shanghai China

ISBN: (纸本)9781510610910

We present a multiplexed quasi-static strain sensor with inf-nano resolution using fiber Fabry-Perot interferometers (FFPIs). The FFPIs are connected in ladder structure with cascaded couplers and delay fibers for multiplexing, and their transient response excited by laser pulses are acquired to distinguish the resonant frequencies of each FFPI. An electro-optical system based on acousto-optic modulator is employed to interrogate the sensor array. In the demonstrational experiment, 3-channel strain measurement with resolutions better than 0.2 n/Hz1/2 in frequency band from 0.1 Hz to 100 Hz is realized. © 2017 SPIE.

关键词： Natural frequencies

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Frequency ratio measurements with 18-digit accuracy using a network of optical clocks

arXiv

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arXiv 2020年

作者： Beloy, Kyle Bodine, Martha I. Bothwell, Tobias Brewer, Samuel M. Bromley, Sarah L. Chen, Jwo-Sy Deschênes, Jean-Daniel Diddams, Scott A. Fasano, Robert J. Fortier, Tara M. Hassan, Youssef S. Hume, David B. Kedar, Dhruv Kennedy, Colin J. Khader, Isaac Koepke, Amanda Leibrandt, David R. Leopardi, Holly Ludlow, Andrew D. McGrew, William F. Milner, William R. Newbury, Nathan R. Nicolodi, Daniele Oelker, Eric Parker, Thomas E. Robinson, John M. Romisch, Stefania Schäffer, Stefan A. Sherman, Jeffrey A. Sinclair, Laura C. Sonderhouse, Lindsay Swann, William C. Yao, Jian Ye, Jun Zhang, Xiaogang National Institute of Standards and Technology BoulderCO80305 United States JILA University of Colorado BoulderCO80309 United States Department of Physics Colorado State University Fort CollinsCO80523 United States Department of Physics Durham University Durham United Kingdom Department of Physics University of Colorado BoulderCO80309 United States IonQ Inc College ParkMD20740 United States Consultation OctoSig Inc. Quebec CityQC Canada Space Dynamics Laboratory North LoganUT84341 United States Northrup Grumman Mission Systems Woodland HillsCA91367 United States Niels Bohr Institute University of Copenhagen Copenhagen Denmark State Key Laboratory of Advanced Optical Communication Systems and Networks Institute of Quantum Electronics Department of Electronics Peking University Beijing100871 China

Atomic clocks occupy a unique position in measurement science, exhibiting higher accuracy than any other measurement standard and underpinning six out of seven base units in the SI system. By exploiting higher resonance frequencies, optical atomic clocks now achieve greater stability and lower frequency uncertainty than existing primary standards. Here, we report frequency ratios of the 27Al+, 171Yb and 87Sr optical clocks in Boulder, Colorado, measured across an optical network spanned by both fiber and free-space links. These ratios have been evaluated with measurement uncertainties between 6 × 10−18 and 8 × 10−18, making them the most accurate reported measurements of frequency ratios to date. This represents a critical step towards redefinition of the SI second and future applications such as relativistic geodesy and tests of fundamental physics. Copyright © 2020, The Authors. All rights reserved.

关键词： Atomic clocks

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Software-defined microwave photonic filter with high reconfigurable resolution

Software-defined microwave photonic filter with high reconfi...

引用

OptoElectronics and communications Conference, OECC

作者： Lilin Yi Wei Wei Yves Jaouen Weisheng Hu State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Institute for Advanced Communication and Data Science Shanghai Jiao Tong University Shanghai China LTCI Télécom ParisTech Université Paris Saclay Paris France

We present an arbitrary-shaped microwave photonic filter based on stimulated Brillouin scattering in the fiber. The filter bandwidth, center frequency, and amplitude response can all be software-defined with a resolut... 详细信息

ISBN: (纸本)9781538691465

关键词： Probes Optimized production technology Integrated circuits Complexity theory Network analyzers Amplitude modulation Notch filters

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High-speed Implementation of Length-compatible Privacy Amplification in Continuous-variable Quantum key Distribution

arXiv

引用

arXiv 2018年

作者： Wang, Xiangyu Zhang, Yichen 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 School of Electronics Engineering and Computer Science Peking University Center for Quantum Information Technology Center for Computational Science and Engineering Beijing100871 China

Privacy amplification is an indispensable step in postprocessing of continuous-variable quantum key distribution (CV-QKD), which is used to distill unconditional secure keys from identical corrected keys between two distant legal parties. The processing speed of privacy amplification has a significant effect on the secret key rate of CV-QKD system. We report the high-speed parallel implementation of length-compatible privacy amplification algorithm based on graphic processing unit. Length-compatible algorithm is used to satisfy the security requirement of privacy amplification at different transmission distances when considering finite-size effect. We achieve the speed of privacy amplification over 1 Gbps at arbitrary input length and the speed is one to two orders of magnitude faster than previous demonstrations, which supports high-speed real-time CV-QKD system and ensures the security of privacy amplification. Copyright © 2018, The Authors. All rights reserved.

关键词： Quantum cryptography

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