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optical Fiber Sensors, OFS 2018

作者： Zhai, Yuyao Liu, Qingwen Li, He Chen, Dian He, Zuyuan State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University 800 Dongchuan Road Shanghai200240 China

ISBN: (纸本)9781943580507

We have proposed a non-mechanical beam-steer lidar system, in which the laser sweeps to realize 1-D beam steering and ranging simultaneously. In the demonstrational experiment, angular coverage of 17◦ is achieved with a steering resoluiton of 0.11◦. Meanwhile, the distance resolution is 1.85 mm over a distance of 1 m. © OSA 2018 © 2018 The Author(s)

关键词： optical radar

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Demonstration of 10-Gb/s, 5-GHz spaced coherent UDWDM-PON with Digital signal processing in real-time

Demonstration of 10-Gb/s, 5-GHz spaced coherent UDWDM-PON wi...

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optical Fiber communication Conference, OFC 2018

作者： Luo, Ming Zeng, Tao Yi, Lilin Li, Jie Li, Xiang Yang, Qi Xue, Lei State Key Laboratory of Optical Comm. Technologies and Networks Wuhan430074 China State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan430074 China

This paper experimentally demonstrate the real-time field trial of 40×10-Gb/s coherent UDWDM-PON at 5-GHz spacing over 40-km field-installed fiber. The system stability is demonstrated by 8-hour real-time BER mea... 详细信息

ISBN: (纸本)9781943580385

关键词： system stability

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Multi-scale GCN-assisted two-stage network for joint segmentation of retinal layers and disc in peripapillary OCT images

arXiv

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arXiv 2021年

作者： Li, Jiaxuan Jin, Peiyao Zhu, Jianfeng Zou, Haidong Xu, Xun Tang, Min Zhou, Minwen Gan, Yu He, Jiangnan Ling, Yuye Su, Yikai John Hopcroft Center for Computer Science Shanghai Jiao Tong University Shanghai200240 China Department of Preventative Ophthalmology Shanghai Eye Disease Prevention and Treatment Center Shanghai Eye Hospital Shanghai200040 China Department of Ophthalmology Shanghai General Hospital Shanghai Jiao Tong University Shanghai200080 China Department of Electrical and Computer Engineering The University of Alabama AL35487 United States State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China

An accurate and automated tissue segmentation algorithm for retinal optical coherence tomography (OCT) images is crucial for the diagnosis of glaucoma. However, due to the presence of the optic disc, the anatomical structure of the peripapillary region of the retina is complicated and is challenging for segmentation. To address this issue, we developed a novel graph convolutional network (GCN)-assisted two-stage framework to simultaneously label the nine retinal layers and the optic disc. Specifically, a multi-scale global reasoning module is inserted between the encoder and decoder of a U-shape neural network to exploit anatomical prior knowledge and perform spatial reasoning. We conducted experiments on human peripapillary retinal OCT images. The Dice score of the proposed segmentation network is 0.820 ± 0.001 and the pixel accuracy is 0.830 ± 0.002, both of which outperform those from other state-of-the-art techniques. Copyright © 2021, The Authors. All rights reserved.

关键词： optical tomography

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Automatic generation of personalized comment based on user profile

arXiv

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arXiv 2019年

作者： Zeng, Wenhuan Abuduweili, Abulikemu Li, Lei Yang, Pengcheng School of Mathematical Sciences Peking University State Key Lab of Advanced Optical Communication System and Networks School of EECS Peking University School of Computer Science and Technology Xidian University MOE Key Lab of Computational Linguistics School of EECS Peking University

Comments on social media are very diverse, in terms of content, style and vocabulary, which make generating comments much more challenging than other existing natural language generation (NLG) tasks. Besides, since different user has different expression habits, it is necessary to take the user's profile into consideration when generating comments. In this paper, we introduce the task of automatic generation of personalized comment (AGPC) for social media. Based on tens of thousands of users' real comments and corresponding user profiles on weibo, we propose Personalized Comment Generation Network (PCGN) for AGPC. The model utilizes user feature embedding with a gated memory and attends to user description to model personality of users. In addition, external user representation is taken into consideration during the decoding to enhance the comments generation. Experimental results show that our model can generate natural, human-like and personalized comments.1. Copyright © 2019, The Authors. All rights reserved.

关键词： User profile

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Carrier-phase estimation for simultaneous quantum key distribution and classical communication using a real local oscillator

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Physical Review A 2019年第2期99卷 022318-022318页

作者： Tao Wang Peng Huang Shiyu Wang Guihua Zeng State Key Laboratory of Advanced Optical Communication Systems and Networks Center of Quantum Sensing and Information Processing Shanghai Jiao Tong University Shanghai 200240 China College of Information Science and Technology Northwest University Xi'an 710127 Shaanxi China

The simultaneous quantum and classical communication (SQCC) protocol is an appealing protocol since it allows continuous-variable quantum key distribution (CV-QKD) and classical communication to be implemented simultaneously by using the same communication infrastructure and on a single wavelength. However, the main challenge of the SQCC protocol is its low tolerance of phase noise, limiting the transmission distance under the real local oscillator (LO) design. To eliminate the phase drift without the aid of the reference signal, the classical carrier phase estimation (CPE) algorithm in the field of coherent optical communication is employed for phase recovery and data extraction. Besides, the power of the residual phase noise in classical communication and the power of the excess phase noise in CV-QKD are derived, including the effects of the employed laser linewidth, the transversal filter length, and the classical signal power. On this basis, the performances of the SQCC protocol under the trusted and the untrusted phase noise model are discussed, respectively. Our work confirms the feasibility of the CPE algorithm in the SQCC protocol and demonstrates the conditions required for this protocol to operate on a coherent optical communication system.

关键词： optical quantum information processing Quantum communication Quantum cryptography Quantum information architectures & platforms Quantum information processing Quantum information processing with continuous variables

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Silicon photonic devices for optical signal processing in wavelength, polarization and mode domains

Silicon photonic devices for optical signal processing in wa...

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Conference on Lasers and Electro-Optics/Pacific Rim, CLEOPR 2018

作者： Zhang, Yong He, Yu Zhou, Huanying Xu, Zhenzhen Jiang, Xinhong Guo, Xuhan Qiu, Ciyuan Su, Yikai State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China

We review recent progress on silicon photonic devices for optical signal processing, including nanobeam devices for wavelength filtering and switching, directional couplers for polarization/mode processing, and subwav... 详细信息

ISBN: (纸本)9781943580453

关键词： optical signal processing

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SBS-based OEO with high tuning resolution and wide tuning range by selecting different-order phase modulation sideband as pump

SBS-based OEO with high tuning resolution and wide tuning ra...

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optical Fiber communication Conference, OFC 2018

作者： Shi, Mengyue Yi, Lilin Hu, Weisheng State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Department of Electronic Engineering Shanghai200240 China

Optoelectronic oscillator with tuning resolution of 10MHz and tuning range up to 40GHz is realized based on stimulated Brillouin scattering. The sideband mode suppression ratio is 50dB and the SSB phase noise is -120d... 详细信息

ISBN: (纸本)9781943580385

关键词： Stimulated Brillouin scattering

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Energy Consumption of Hybrid Data Center networks

Energy Consumption of Hybrid Data Center Networks

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International Conference on Network and Service Management

作者： Joel Reginald Dodoo Weiqiang Sun Feng Zhu Weisheng Hu Shanghai Institute for Advanced Communication and Data Science Shanghai Jiao Tong University China SMcGill University Canada State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University China

ISBN: (数字)9783903176249

ISBN: (纸本)9781728153964

Existing data center networks (DCNs) based on only electronic packet or all-optical switching still pose an exponential increase in power consumption and cost due to the current high demand for digital data and sustainability issues. The recent development of hybrid DCN prototypes is a promising solution offering relatively higher data throughput, low latency, reduction in cost and energy consumption. This paper explores the frontier of hybrid DCN with a special focus on energy consumption and cost. We evaluate the energy consumption per bit and the greenhouse gas (GHG) emission per year of three hybrid switching systems as compared with an optical point to point (ptp) network, results show that the hybrid switching systems will consume less energy per bit and are likely to emit less GHG annually. We present feasibility analysis on the energy consumption and cost of some hybrid DCN prototypes. Evaluation results show that Helios-like and Hybrid optical Switching-like prototypes achieve a power usage effectiveness (PUE) value lower than 1.2, an index which represents a very efficient level of energy performance in a data center network.

关键词： Germanium

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Experimental implementation of bias-free quantum random number generator based on vacuum fluctuation

arXiv

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arXiv 2019年

作者： Zheng, Ziyong 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 Center for Quantum Information Technology Peking University Beijing100871 China

We experimentally demonstrate a bias-free optical quantum random number generator with real-time randomness extraction to directly output uniform distributed random numbers by measuring the vacuum fluctuation of quantum state. A phase modulator is utilized in the scheme to effectively reduce the influence of deviations between two arms of the generator caused by the imperfect practical devices, which is an innovative solution in the field of quantum random number generator. In the case where the feedback modulation frequency is much faster than the phase jitter, an unbiased result can be obtained by an additional subtraction between the compensation signal and its average value to eliminate residual deviation. A following randomness extractor is applied to eliminate the influence of residual side information introduced by the imperfect devices in practical system. Copyright © 2019, The Authors. All rights reserved.

关键词： Random number generation

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An Improved Non-Geometrical Stochastic Model for Non-WSSUS Vehicle-to-Vehicle Channels

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ZTE communications 2019年第4期17卷 62-71页

作者： HUANG Ziwei CHENG Xiang ZHANG Nan State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer SciencePeking UniversityBeijing 100871China Key Laboratory of Wireless Sensor Network&Communication Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Wireless Algorithm Department Product Research and Development SystemZTE CorporationShanghai 201203China

A novel non-geometrical stochastic model(NGSM)for non-wide sense station ary uncorrelated scattering(non-WSSUS)vehicle-to-vehicle(V2V)channels is *** model is based on a conventional NGSM and employs a more accurate method to reproduce the realistic characteristics of V2V channels,which successfully extends the existing NGSM to include the line-of-sight(LoS)***,the statistical properties of the proposed model in different scenarios,including Doppler power spectral density(PSD),power delay profile(PDP),and the tap correlation coefficient matrix are simulated and compared with those of the existing ***,the simulation results dem onstrate not only the utility of the proposed model,but also the correctness of our theoreti cal derivations.

关键词： vehicle-to-vehicle non-WSSUS channels non-geometrical stochastic model LoS component statistical properties

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