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Asia-Pacific network Operations and Management Symposium (APNOMS)

作者： Wei Ye Xuan Luo Rui Xie Haibin Zhang Kaida Jiang Yaohui Jin State Key Laboratory of Advanced Optical Communication System and Network Shanghai Jiao Tong University Shanghai China Network & Information Center Shanghai Jiao Tong University Shanghai China

BitTorrent(BT) has emerged as one of the most popular protocols for content sharing in recent years. Most BT applications are network-oblivious which brings great challenges to traffic engineering. As basic input information, network-wide BT traffic distribution is of vital importance for service providers (SP) or carriers to enforce appropriate control policies. Direct online measurement of network-wide BT traffic faces scalability issue, for it requires deploying application identification deep packet inspection (DPI) device on every subject link. In this paper, we propose a novel approach to estimate network-wide BT traffic distribution through combining sFlow and Tracker traffic analysis. Owing to a noticeable increase of BT traffic using random port numbers, sFlow alone is no longer sufficient for BT recognition. We tackle this problem by combining sFlow with information collected from BT tracker's traffic. With assistance of this information, BT samples can be accurately distinguished from other sFlow samples. The efficacy of our approach is evaluated through experiments on backbone links of campus network. Evaluation results show that our approach can reach a high accuracy in network-wide BT traffic estimation.

关键词： Estimation Peer to peer computing Protocols IP networks Accuracy Conferences Synchronization

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Dichotomy Slot Allocation: A Low-Jitter Scheduling Scheme for Input-Queued Switches

Dichotomy Slot Allocation: A Low-Jitter Scheduling Scheme fo...

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IEEE Workshop on High Performance Switching and Routing

作者： Jingjing Zhang Yaohui Jin Nirwan Ansari Weisheng Hu Advanced Networking Laboratory New Jersey Institute of Technology Newark NJ USA State Key Laboratory of Advanced Optical Communication system and Network Shanghai Jiaotong University Shanghai China

Recently, jitter is becoming an important performance criterion in switch scheduling to accommodate many emerging real-time applications. Formerly proposed low-jitter scheduling algorithms decompose traffic demands into a weighted sum of permutation matrices and then schedule these decomposed permutation matrices. However, a port pair's appearance in these decomposed matrices may exceed their actual traffic demand. Such extra allocation may result in high jitter for a port pair. In order to smoothly schedule each port pair, we propose a novel scheduling algorithm termed as dichotomy slot allocation (DSA). To achieve low jitter and small cell loss, DSA allocates slots to port pairs based on a designed Dichotomy Order. Both analysis and simulation results demonstrate that DSA achieves relatively lower jitter as compared to the state of the art.

关键词： Jitter Matrix decomposition Traffic control Round robin Scheduling algorithm Fabrics optical switches communication switching Analytical models Impedance matching

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基于最先进的光钟直接演示自旋压缩引起的计量增强

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Science Bulletin 2024年第10期69卷 1359-1361页

作者：陈景标于得水 State Key Laboratory of Advanced Optical Communication System and NetworkSchool of ElectronicsPeking UniversityBeijing 100871China National Time Service Center Chinese Academy of SciencesXi’an 710600China Key Laboratory of Time Reference and Applications Chinese Academy of SciencesXi’an 710600China

Benefiting from the recent progress in precise engineering of quantum states and sub-10 mHz linewidth lasers,the stability and accuracy of optical atomic clocks have reached and even exceeded the 1018 level,surpassing their microwave counterparts by over two orders of magnitude[1,2].These advances lead to an anticipated redefinition of the international system of units(SI)second in terms of an optical reference transition as early as 2026.

关键词： optical 光钟自旋压缩

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Fast shape matching and retrieval with dynamic angular partition descriptor

Fast shape matching and retrieval with dynamic angular parti...

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IEEE International Workshop on Imaging systems and Techniques (IST)

作者： Pengfei Shi Yongkun Wang Ying Hu Yaohui Jin The State Key Lab of Advanced Optical Communication Systems and Networks China Network & Information Center Shanghai Jiao Tong University Shanghai China

Shape matching and retrieval are fundamental topics in image processing area. With the rapid growing number of images, fast speed in shape matching is necessary, but most methods focus on the retrieval accuracy. In this article, we propose a dynamic angular partition descriptor (DAPD) based on the statistical distribution of the shape contour points, which is scale invariant inherently. DAPD has low computational complexity which enables fast shape matching, and naturally sacrifices a little accuracy in retrieval. However, we leverage the angle sensitivity in the structure of DAPD, which can compensate the loss in accuracy by 4.46% on average. Experiments on several shape databases show that, our descriptor can speed up shape matching by up to 13X, but still retains 91.92% accuracy in the top-4 similar shapes in retrieval tests. Meanwhile, we generate some distorted shapes to verify the robustness of DAPD against rotation and noise.

关键词： Shape Sensitivity Computational complexity Histograms Automobiles Statistical distributions

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Querying about the Near Future Positions of Moving Objects

Querying about the Near Future Positions of Moving Objects

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International Multi-Symposiums on Computer and Computational Sciences (IMSCCS)

作者： Jing Guo Wei Guo Dongru Zhou School of Computer Science Wuhan University of China Wuhan China The State Key Laboratory of Advanced Optical Communication System and Network Shanghai JiaoTong University Shanghai China

Moving objects continuously generate large amounts of spatio-temporal data. Maintaining and querying the location information of moving objects are a crucial problem. This paper focuses on the query problems of indexing structure for moving objects. The main focus of query processing is retrieval of approximate future movement information about moving objects that may be unavailable. First, a VPMR-tree is proposed for indexing the moving objects in road networks. Second, exponential smoothing method for predicting the result of queries that refer to the future is implemented. The experimental results have shown that VPMR-tree achieves a better performance for query evaluation than TPR-tree

关键词： Indexing Roads Spatial databases Computer science Query processing Global Positioning system optical fiber communication Information retrieval Smoothing methods Wireless communication

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Indexing of Constrained Moving Objects for Current and Near Future Positions in GIS

Indexing of Constrained Moving Objects for Current and Near ...

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International Multi-Symposiums on Computer and Computational Sciences (IMSCCS)

In geographic information system (GIS), fast and efficiently indexing moving objects are a crucial issue in several application domains, such as LBS, intelligence transportation and digital battle. In this paper, a new index structure, PQR-tree, is proposed to fast update and efficiently index the present or near future positions of constrained moving objects based on the characters of moving objects. PQR-tree is an integrated tree structure which combined PMR quadtree, quadtree and R*-tree together. Firstly, QR-tree which combined quadtree and R*-tree is used to carry out rough level partition for index space based on range region. Next, an R*-tree is used to index quasi-static objects for each subspace. Then, using a splitting rule of PMR quadtree to carry further level partition for index space based on road networks and all fast moving objects are related to the road networks. The experimental results show that PQR-tree achieves better performance for index updating and query evaluation than TPR-tree

关键词： Indexing Geographic Information systems Computer science Roads optical fiber communication Application software Intelligent transportation systems Intelligent networks Tree data structures Query processing

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Transport of ultracold atoms in superpositions of S- and D-band states in a moving optical lattice

arXiv

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arXiv 2022年

作者： Yu, Zhongcheng Tian, Jinyuan Peng, Peng Mao, Dekai Chen, Xuzong Zhou, Xiaoji State Key Laboratory of Advanced Optical Communication System and Network School of Electronics Peking University Beijing100871 China Institute of Advanced Functional Materials and Devices Shanxi University Taiyuan030031 China

Ultracold atoms in a moving optical lattice with high controllability are a feasible platform to research the transport phenomenon. Here, we study the transport process of ultracold atoms at D band in a one-dimensional optical lattice, and manipulate the transport of superposition states with different superposition weights of S-band and D-band atoms. In the experiment, we first load ultracold atoms into an optical lattice using shortcut method, and then accelerate the optical lattice by scanning the phase of lattice beams. The atomic transport at D band and S band is demonstrated respectively. The group velocity of atoms at D band is opposite to that at S band. By preparing superposition states with different superposition weights of D-band and S-band atoms, we realize the manipulation of atomic group velocity from positive to negative, and observe the quantum interference between atoms at different bands. The influence of the lattice depth and acceleration on the transport process is also studied. Moreover, the multi-orbital simulations are coincident with the experimental results. Our work sheds light on the transport process of ultracold atoms at higher bands in optical lattices, and provides a useful method to manipulate the transport of atomic superposition states. © 2022, CC BY.

关键词： optical lattices

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High-performance III-V/Si3N4 O-band External Cavity Tunable Laser

High-performance III-V/Si3N4 O-band External Cavity Tunable ...

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CLEO: Science and Innovations, S and I 2022

作者： Guo, Yuyao Li, Xinhang Jin, Minhui Liu, Chuxin Xu, Weihan Lu, Liangjun Xie, Jingya Chen, Jianping Zhou, Linjie State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai200240 China SJTU-Pinghu Institute of Intelligent Optoelectronics Pinghu314200 China Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation Center Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology Shanghai200093 China

We present a III-V/Si3N4 O-band hybrid laser, which shows a high output power of 42 mW, wide tuning range of 62 nm with side-mode suppression ratio >50 dB, and narrow intrinsic linewidth of ~600 Hz. © Optica P...

ISBN: (纸本)9781557528209

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Differentiated Protection Services with Failure Probability Guarantee for Workflow-Based Applications

Differentiated Protection Services with Failure Probability ...

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Asia communications and Photonics Conference and Exhibition(2010亚洲光纤通信与光弹博览会及研讨会 ACP 2010)

作者： Yaoquan Zhong Wei Guo Weiqiang Sun Yaohui Jin Weisheng Hu State Key Lab on Fiber-Optical Local Area Network and Advanced Optical Communication Systems Shanghai Jiao Tong University ShanghaiP.R.China 200240 China

ISBN: (纸本)9780819485571;0819485578

This paper introduces the concept of failure probability to measure the security level of communication tasks with different protection modes. Based on failure probability analysis, we develop three differentiated protection services provisioning strategies which can provide security level guarantee and network-resource optimization for workflow-based applications in optical grid.

关键词： differentiated protection services workflow-based application failure probability guarantee optical grid Legal Services server software web applications Differentiation differentiated batholith failure probability Heuristic algorithms Connections

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A Novel Method with Martingale Theory for Phase Noise Analysis in Coherent optical communication

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Optics and Photonics Journal 2013年第2期3卷 171-174页

作者： Chengle Sui Qiangmin Wang Shilin Xiao Pingqing Li School of Information Security Engineering Shanghai Jiao Tong University Shanghai China State Key Lab of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China

Phase noise has a great influence on the performance of coherent optical communication. In this paper, martingale theory is introduced to analyze the phase noise effect for the first time as far as we know. Through Fubini’s Theory and martingale representation theory, we proved that , which denotes the phase noise effect, is a predictable martingale. Then Ito’s formula for solution to stochastic differential equation is utilized for the analysis of phase noise effect. Using our method, a nonrecursive formula for the moments of phase noise is derived and signal-noise-ratio (SNR) degradation in coherent optical OFDM due to phase noise is calculated with our method.

关键词： Martingale Brownian Motion Ito Itegral Derivation of Moments Phase Noise

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