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network Architectures, Management, and Applications VI

作者： Li, Xinlin Hong, Cheng Li, Mingjin Zhang, Cheng Hu, Weiwei Chen, Zhangyuan State Key Lab. of Advanced Optical Communication Systems and Networks Electronics Department Peking University Beijing 100871 China

ISBN: (纸本)9780819473776

The wavelength-division multiplexing passive optical network (WDM-PON) is considered to be a promising method to overlay or upgrade the existing optical access network. A centralized WDM-PON in which the downstream wavelength is reused to modulate the upstream has been studied comprehensively, for same wavelength operation of both downstream and upstream, colorless operation and source-free of optical network units (ONU) can be realized in such systems. We propose a scheme of centralized WDM-PON with non-return-to-zero/continuous-wave (NRZ/CW)polarization multiplexed downstream and remodulated upstream using a CW injection-locked Fabry-Perot (FP) *** scheme can eliminate the crosstalk of downstream data on the upstream and get higher extinction ratio of received downstream signal. Experiment with 22.2km transmission of 10-Gb/s downstream signal and 622-Mb/s upstream signal was realized using a commercial FP laser, with power penalties of 0.2dB and 0dB respectively. 2.5-Gb/s upstream signal using an injection locked FP laser was also investigated, and 61 modes within 25.4nm span were locked with side-mode suppression ratio of above 27dB. © 2008 SPIE.

关键词： Passive optical networks

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Performance analysis of various multi-granularity switching architectures and an on-line RWA algorithm

Performance analysis of various multi-granularity switching ...

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network Architectures, Management, and Applications IV

作者： Qi, Yongmin Jin, Yaohui Hu, Weisheng State Key Lab. of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai 200240 China

ISBN: (纸本)081946449X

Waveband switching (WBS) is proposed as a promising technique to reduce the number of switching ports, which could translate to the switching fabric size and cost of the nodes in the dense wavelength division multiplexing (DWDM) network. We propose a routing and wavelength/waveband (RWA) heuristic algorithm, called Maximize the Number of Waveband Route (MNWR) for the dynamic arriving traffic demands in the multi-granularity WBS optical network. We study the performance of various MG-OXC architectures including the serial three-stage MG-OXC and the interconnecting three-stage MG-OXC proposed by our group employing the on-line MNWR algorithm. Simulation results indicate that the interconnecting three-stage MG-OXC outperforms the serial three-stage architecture in terms of blocking performance for dynamic requests.

关键词： Computer architecture

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Self-healing optical access networks (SHOAN) operated by optical switching technologies

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IEEE Transactions on network and Service Management 2011年第3期8卷 234-244页

作者： Huang, Anpeng Liu, Siyu Xie, Linzhen Chen, Zhangyuan Mukherjee, Biswanath State Key Lab. of Advanced Optical Communication Systems and Networks China Wireless Communications Lab. PKU-UCLA Joint Research Institute Peking University Beijing 100871 China Department of Computer Science University of California Davis United States

An optical access network should offer low-cost reliable services to its end users. To address this problem, an optimal solution is needed which can turn an optical access architecture into a self-healing system. Hence, we propose the Self-Healing optical Access network (SHOAN), in which two or more optical access architectures are partners of each other, and they are interconnected by elementary optical crossbar switches into a simple mesh network. In SHOAN, the crossbar switches can keep each access architecture as an independent and closed system for only serving its own end users in normal state. But the crossbars become open in fault scenarios. Whenever a failure occurs in the network, the fault can be monitored and affected services can be recovered by the partner of the access architecture that is affected. Such an interconnected optical access network can withstand failures in its transmission paths, and recover network services in a self-healing way. Compared to existing solutions (e.g., dual-home architecture), illustrative examples demonstrate that SHOAN has many desirable properties: (1) it is robust because risks are disjointed, (2) it is reliable because service recovery is given top priority, and (3) it has low cost because redundant backup components are not necessary since the partner's resources act as backup resources. Analysis results show that SHOAN can minimize disruption duration and network cost for broadband access services. © 2011 IEEE.

关键词： Cost benefit analysis

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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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First International Multi- Symposiums on Computer and Computational Sciences, IMSCCS'06

作者： Jing, Guo Wei, Guo Dongru, Zhou School of Computer Science Wuhan University Wuhan 430072 China State Key Lab of Advanced Optical Communication System and Network Shanghai Jiao Tong University Shanghai 200030 China

ISBN: (纸本)0769525814

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 unavailab.e. 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. © 2006 IEEE.

关键词： Tracking (position)

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Two-Stage Topic Sentence Extraction for Chinese Student Essays 12th

Two-Stage Topic Sentence Extraction for Chinese Student Ess...

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12th National CCF Conference on Natural Language Processing and Chinese Computing, NLPCC 2023

作者： Dong, Yuwu Zheng, Feiran Chen, Hongyu Ding, Yizhou Zhou, Yifan He, Hao MoE Key Lab of Artificial Intelligence AI Institute Shanghai Jiao Tong University Shanghai China State Key Lab of Advanced Optical Communication System and Network Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9783031446986

In this paper, we present the method proposed by our team for Track 2 of NLPCC 2023 Shared Task 7, which focuses on the extraction of paragraph-level and whole essay topic sentences in middle school student essays. This paper proposes a two-stage topic sentence extraction framework for each paragraph and the whole essay. In the first stage, we extract topic sentences for each paragraph, considering local semantic and contextual aspects. In the second stage, we derive the text topic sentence for the whole essay from the extracted paragraph-level topic sentences. Compared with the one-stage method, the two-stage method which can focus on the local semantic information of paragraphs related to the task has advantages in paragraph and full-text topic sentence extraction. Comparative experiments show that the extraction performance of the fine-tuned two-stage topic sentence extraction framework surpasses the few-shot large language models (GPT-3.5 et al.). The final comprehensive index also achieved the first-place result in this track. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Semantics

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Coherent optical OFDM scheme with inter-carrier interference self-cancellation

Coherent optical OFDM scheme with inter-carrier interference...

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作者： Zhao, Chunxu Li, Juhao Wu, Yiling Zhao, Yuping Zhang, Fan Chen, Zhangyuan State Key Lab. of Advanced Optical Communication Systems and Networks Peking University Beijing 100871 China

We propose two inter-carrier interference (ICI) self-cancellation schemes based on CO-OFDM system. They can not only enhance the laser linewidth tolerance of the system, but also improve the robustness against fiber n... 详细信息

ISBN: (纸本)9784885522451

关键词： Orthogonal frequency division multiplexing

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Comparison of CD and SPM tolerances for CO-SCFDE and CO-OFDM systems

Comparison of CD and SPM tolerances for CO-SCFDE and CO-OFDM...

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作者： Zhang, Su Li, Juhao Zhang, Fan Chen, Zhangyuan State Key Lab. of Advanced Optical Communication Systems and Networks Peking University Beijing 100871 China

We compare the transmission performances of CO-SCFDE and CO-OFDM systems with the same system setup and almost the same DSP methods except the IFFT processing. Both CD and SPM tolerances are investigated.

ISBN: (纸本)9784885522451

关键词： Orthogonal frequency division multiplexing

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An offset differential assembly method at the edge of OBS network

An offset differential assembly method at the edge of OBS ne...

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optical Transmission, Switching, and Subsystems III

作者： Sui, Zhicheng Zeng, Qingji Xiao, Shilin State Key Lab. of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Minhang Shanghai 200240 China

Traditional burst assembly method only differ service class priority by increasing extra offset time so as to assure QoS at optical Burst Switching (OBS) core node which increases all network delay extremely, especially for optical network with many hops and large radius. In order to take full advantage of flexible buffer and control function of electronics device and optical large capacity predominance, it is desired to process real-time traffic at edge ingress node and guarantee delay fairness under small enough delay and QoS based on offset time differentiation for various classes. To achieve lower assembly delay at OBS edge node and offset time based QoS guarantee at core node, this paper proposes an approach called Prediction and Offset QoS Assembly (POQA) to improve existing burst assembly mechanism at edge node. POQA method takes into account the delay fairness and QoS-based offset time adequately. The ratios of assembly time and offset time are introduced to make a delay and offset differentiation among various traffic classes. Assembly delay, burst size, burst utilization and length error of various classes are compared under different offered load. Moreover, in contrast with traditional time assembly method, simulation results show that POQA method can achieve a significant improvement in terms of burst delay and utilization and realize the delay fairness and offset time QoS differentiation under different traffic offered load.

关键词： Switching networks

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A 60-GHz RoF system in WDM-PON with reduced number of modulators and low-cost electronics

A 60-GHz RoF system in WDM-PON with reduced number of modula...

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2010 Photonics Global Conference, PGC 2010

作者： Zhang, Liang Hu, Xiaofeng Cao, Pan Su, Yikai State Key Lab. of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University China

ISBN: (纸本)9781424498826

We propose and experimentally demonstrate a simple and cost-effective scheme to converge a 60-GHz radio-over-fiber (RoF) system with a wavelength division multiplexed-passive optical network (WDN-PON) system. Only 10-GHz electronic devices are used to generate a 60-GHz RoF signal based on frequency-sextupling technology. For n-channel WDN-PON and RoF converged system, only n+1 modulators are required.

关键词： Radio-over-fiber

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Gated multi-task network for text classification

Gated multi-task network for text classification

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2018 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies, NAACL HLT 2018

作者： Xiao, Liqiang Zhang, Honglun Chen, Wenqing State Key Lab of Advanced Optical Communication System and Network Shanghai Jiao Tong University Artificial Intelligence Institute Shanghai Jiao Tong University 800 Dongchuan Road Shanghai China

ISBN: (纸本)9781948087292

Multi-task learning with Convolutional Neural network (CNN) has shown great success in many Natural Language Processing (NLP) tasks. This success can be largely attributed to the feature sharing by fusing some layers among tasks. However, most existing approaches just fully or proportionally share the features without distinguishing the helpfulness of them. By that the network would be confused by the helpless even harmful features, generating undesired interference between tasks. In this paper, we introduce gate mechanism into multi-task CNN and propose a new Gated Sharing Unit, which can filter the feature flows between tasks and greatly reduce the interference. Experiments on 9 text classification datasets shows that our approach can learn selection rules automatically and gain a great improvement over strong baselines. © 2018 Association for Computational Linguistics.

关键词： Convolutional neural networks

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