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OptoElectronics and communications Conference, OECC

作者： Weikang Jia Meihua Bi Xin Miao Weisheng Hu State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China College of Communication Engineering Hangzhou Dianzi University Hangzhou China

We propose a novel scheme based on uneven mapping to reduce the PAPR of OFDM signal and verify its availability by transmitting 10 × 20MHz LTE-A signal. The results show that this method could achieve 2% the EVM ... 详细信息

关键词： Peak to average power ratio optical attenuators optical transmitters Fiber nonlinear optics optical fibers

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Study of dual-polarization OQAM-OFDM PON with direct detection

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Optoelectronics Letters 2016年第1期12卷 65-68页

作者：罗清龙冯敏白成林胡卫生 Key Laboratory of Optical Communications Science & Technology in Shandong Province College of Physics Science and Information EngineeringLiaocheng University State Key Lab.of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University

An offset quadrature amplitude modulation orthogonal frequency-division multiplexing(OQAM-OFDM) passive optical network(PON) architecture with direct detection is brought up to increase the transmission range and improve the system *** optical line terminal(OLT),OQAM-OFDM signals at 40 Gbit/s are transmitted as *** each optical network unit(ONU),the optical OQAM-OFDM signal is demodulated with direct *** results show that the transmission distance can exceed 20 km with negligible penalty under the experimental conditions.

关键词： Amplitude modulation Frequency division multiplexing optical fiber communication Passive optical networks Quadrature amplitude modulation Signal detection

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High Performance optical Modulator and Detector for 100 Gb/s Transmission system

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ZTE communications 2017年第3期15卷 46-51页

作者： ZHONG Fang GONG Pan ZHOU Zhiping HUA Feng WANG Huitao State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer SciencePeking UniversityBeijing 100871China Wireline Product Operation ZTE CorporationBeijing 100191China

Silicon photonics, one of the most promising candidates forbreaking the bottleneck of current optical transmission systems, has been developing rapidly in both performance andmaturity. The analysis and design of the two key componentsof this technology, the optical modulator and detector, are presented in this paper. The Mach-Zehnder modulator with Utype PN junction is optimized to obtain the modulation efficiency of 0.559 V·cm. The electro-optical 3 dB bandwidth ofthis device is 30 GHz. The simulation of the PIN waveguideSi based Ge photodetector at 1.55 μm wavelength is also presented. The device shows a very low dark current of about 10 nA-at1 V, and the obtained responsivity and 3 dB bandwidth are appreciable. These results practically meet the requirement of commercial 100 Gb/s optical transmission systems.

关键词： silicon photonics modulator detector

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Mapping and measuring large-scale photonic correlation with single-photon imaging

arXiv

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arXiv 2018年

作者： Sun, Ke Gao, Jun Cao, Ming-Ming Jiao, Zhi-Qiang Liu, Yu Li, Zhan-Ming Poem, Eilon Eckstein, Andreas Ren, Ruo-Jing Pang, Xiao-Ling Tang, Hao Walmsley, Ian A. Jin, Xian-Min State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui230026 China Clarendon Laboratory University of Oxford Parks Road OxfordOX1 3PU United Kingdom Department of Physics of Complex Systems Weizmann Institute of Science Rehovot7610001 Israel

Quantum correlation and its measurement are essential in exploring fundamental quantum physics problems and developing quantum enhanced technologies. Quantum correlation may be generated and manipulated in different spaces, which demands different measurement approaches corresponding to position, time, frequency and polarization of quantum particles. In addition, after early proof-of-principle demonstrations, it is of great demand to measure quantum correlation in a Hilbert space large enough for real quantum applications. When the number of modes goes up to several hundreds, it becomes economically unfeasible for single-mode addressing and also extremely challenging for processing correlation events with hardware. Here we present a general and large-scale measurement approach of Correlation on Spatially-mapped Photon-Level Image (COSPLI). The quantum correlations in other spaces are mapped into the position space and are captured by single-photon-sensitive imaging system. Synthetic methods are developed to suppress noises so that single-photon registrations can be faithfully identified in images. We eventually succeed in retrieving all the correlations with big-data technique from tens of millions of images. We demonstrate our COSPLI by measuring the joint spectrum of parametric down-conversion photons. Our approach provides an elegant way to observe the evolution results of large-scale quantum systems, representing an innovative and powerful tool added into the platform for boosting quantum information processing. Copyright © 2018, The Authors. All rights reserved.

关键词： Photons

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A low-complexity sensor fusion algorithm based on a fiber-optic gyroscope aided camera pose estimation system

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Science China(Information Sciences) 2016年第4期59卷 160-171页

作者： Zhongwei TAN Chuanchuan YANG Yuliang LI Yan YAN Changhong HE Xinyue WANG Ziyu WANG State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University School of Information Science and Technology Xiamen University College of Information and Electrical Engineering China Agricultural University

Visual tracking, as a popular computer vision technique, has a wide range of applications, such as camera pose estimation. Conventional methods for it are mostly based on vision only, which are complex for image processing due to the use of only one sensor. This paper proposes a novel sensor fusion algorithm fusing the data from the camera and the fiber-optic gyroscope. In this system, the camera acquires images and detects the object directly at the beginning of each tracking stage; while the relative motion between the camera and the object measured by the fiber-optic gyroscope can track the object coordinate so that it can improve the effectiveness of visual tracking. Therefore, the sensor fusion algorithm presented based on the tracking system can overcome the drawbacks of the two sensors and take advantage of the sensor fusion to track the object accurately. In addition, the computational complexity of our proposed algorithm is obviously lower compared with the existing approaches(86% reducing for a 0.5 min visual tracking). Experiment results show that this visual tracking system reduces the tracking error by 6.15% comparing with the conventional vision-only tracking scheme(edge detection), and our proposed sensor fusion algorithm can achieve a long-term tracking with the help of bias drift suppression calibration.

关键词： visual tracking camera pose estimation fiber-optic gyroscope low-complexity sensor fusion

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Quantum relay schemes for continuous-variable quantum key distribution

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Physical Review A 2017年第4期95卷 042326-042326页

作者： Ying Guo Qin Liao Duan Huang Guihua Zeng School of Information Science and Engineering Central South University Changsha 410083 China State Key Laboratory of Advanced Optical Communication Systems and Networks and Center of Quantum Information Sensing and Processing Shanghai Jiao Tong University Shanghai 200240 China

We propose several concatenated quantum relay continuous-variable quantum key distribution schemes based on the parametric amplifier (PA) and the beam splitter (BS). Instead of using only one BS in the traditional relay scheme, the proposed schemes provide two operations that involve both PA and BS, activating the beam splitting and recombining operations in turn. These schemes would benefit the system performance improvement by providing signal amplification and establishing quantum correlations. We show that the different effects of the relay schemes will cause different system performances because of the varied signal-to-noise ratio (SNR) of output fields. The system's secret key rate will be increased when equipping with the PA-BS relay scheme, because the output fields of the PA are entangled with the correlated quantum noises while input fields of the BS are superimposed, subsequently leading to the quantum noise reduction of the total output fields of relay station, while the reversed BS-PA relay scheme has little advantage over the traditional counterpart that contains only one BS in relay data postprocessing because it will not cause any SNR improvement. Moreover, the reinforced PA-PA relay scheme results in a slight improvement due to the increased SNR. These quantum relay schemes can be performed through the beam splitting, the recombining operations, and the relay data postprocessing, such that it would be suitable for secret information exchange in complex networks with intermediate stations.

关键词： Quantum communication Quantum cryptography Quantum information processing with continuous variables

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Light source monitoring in quantum key distribution with single photon detector at room temperature

arXiv

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arXiv 2017年

作者： Wang, Gan Li, Zhengyu Qiao, Yucheng Chen, Ziyang Peng, Xiang Guo, Hong State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Center for Quantum Information Technology Peking University Beijing100871 China

Photon number resolving monitoring is a practical light source monitoring scheme in QKD systems, which reduces the impacts from untrusted sources effectively. This scheme requires a single photon detector, normally working at low temperature to suppress its dark count rate. In this paper, we use a room-temperature detector and show that the dark count rate is irrelevant to the monitoring performance in our scheme, which can sufficiently relax requirements on the detector’s working conditions as well as integration complexity, and this would be highly demanded for practical systems. Furthermore, influences of parameter drifts at room temperature are analyzed, and the monitoring scheme is testified in a real QKD system. Copyright © 2017, The Authors. All rights reserved.

关键词： Light sources

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Machine-learning detector based on support vector machine for 122-Gbps multi-CAP optical communication system

Machine-learning detector based on support vector machine fo...

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OptoElectronics and communications Conference, OECC

作者： Lin Sun Jiangbing Du Guoyao Chen Zuyuan He Xia Chen Graham T. Reed State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China Optoelectronics Research Centre University of Southampton Southampton Hampshire UK

In this work, we firstly apply support vector machine (SVM) detector in 122-Gbps Multi-CAP system. It can de-map the rotated constellations directly without any correction. The concrete simulations indicate such a machine-learning based detector provides considerable BER reduction for high-density CAPs in low-frequency band, compared with hard decision.

关键词： Support vector machines Detectors optical fiber communication optical distortion optical detectors optical filters Adaptive optics

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Sensing the Earth with micro-optics

Sensing the Earth with micro-optics

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Microopics Conference (MOC)

作者： Zuyuan He Qingwen Liu Jiageng Chen Tomochika Tokunaga State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Minhang Shanghai China Department of Environment Systems University of Tokyo Chiba Japan

We present a multiplexed quasi-static strain sensor system with sub-nano resolution based on the transient response of fiber Fabry-Perot interferometers. A 3-channel strain measurement with resolution better than 0.2 ... 详细信息

关键词： Resonant frequency optical fiber sensors Strain Cavity resonators Laser beams Strain measurement

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Four-wave mixing effect reduction in O-band multi-wavelength NG-EPON system based on chirped DML

Four-wave mixing effect reduction in O-band multi-wavelength...

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OptoElectronics and communications Conference, OECC

作者： Xin Miao Meihua Bi Hao He Weisheng Hu State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai China College of Communication Engineering Hangzhou Dianzi University Hangzhou Zhe Jiang province China

We investigate the influence of FWM effect in O-band multi-wavelength NG-EPON system with chirped DML. Simulation results indicate that DML chirp can reduce FWM impairment to a great extent, and almost no sensitivity ... 详细信息

关键词： Chirp optical transmitters Passive optical networks Adiabatic Receivers optical attenuators

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