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network Architectures, Management, and Applications VI

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

ISBN: (纸本)9780819473776

optical grid, the integrated computing environment based on optical network, is expected to be an efficient infrastructure to support advanced data-intensive grid applications. In optical grid, the faults of both computational and network resources are inevitable due to the large scale and high complexity of the system. With the optical network based distributed computing systems extensive applied in the processing of data, the requirement of the application failure probability have been an important indicator of the quality of application and an important aspect the operators consider. This paper will present a task-based analysis method of the application failure probability in optical grid. Then the failure probability of the entire application can be quantified, and the performance of reducing application failure probability in different backup strategies can be compared, so that the different requirements of different clients can be satisfied according to the application failure probability respectively. In optical grid, when the application based DAG (directed acyclic graph) is executed in different backup strategies, the application failure probability and the application complete time is different. This paper will propose new multi-objective differentiated services algorithm (MDSA). New application scheduling algorithm can guarantee the requirement of the failure probability and improve the network resource utilization, realize a compromise between the network operator and the application submission. Then differentiated services can be achieved in optical grid. © 2008 SPIE.

关键词： Data handling

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An integrated quantum secure communication system

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Science China(Information Sciences) 2011年第12期54卷 2598-2611页

作者： DAI WenChao, LU Yuan, ZHU Jun & ZENG GuiHua state key lab of advanced optical communication systems and networks, Department of Electronic Engineering Shanghai Jiaotong University, Shanghai 200240, China 1. State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiaotong University Shanghai 200240 China

In this paper, we investigate experimentally an integrated quantum secure communication system using weak coherent state. Two modules are involved in the presented system. One is used for generating the secret key which is obtained using continuous variable quantum key distribution scheme, and the other serves to encrypt and decrypt the real-time private data using a pure quantum cryptographic algorithm. The sifted key rate with reverse reconciliation is 8.6 and 3.9 kb/s in the quantum key distribution scheme under the individual attack and the collective attack, respectively. The system uses an all-fiber dual unbalance beam Mach-Zehnder interferometer, and is implemented with a 500 kb/s modulation rate over 27.2 km of optical fiber.

关键词： quantum key distribution quantum stream encryption integrated system

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High Technology Letters 2005年第4期11卷 342-345页

作者：隋志成 Zeng Qingji Xiao Shilin State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiaotong University Shanghai 200030 P. R. China

This paper investigates the traffic properties before and after assembly at edge node of Ethernet over optical burst switching （OBS） network for the first time. Burst and inter-arrival time distributions are simulated under time-based and length-based assembly schemes. Self-similar traffic Hurst parameter is compared through R/S and V/T plot. Finally three self-similar traffic generating methods are given. Simulation resuhs demonstrate that, muhi-source traffic increases self-similar degree, however after assembly, time-based scheme can decrease self similar degree, and aggregated burst size is close to Gaussian distribution. Length-based method has no effects on the self-similarity of input traffic. RMD is fit for study of burst network with large self-similarity.

关键词： self-similar burst assembly traffic

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Ontology-Semantic Alignment On Contrastive Video-Language Model for Multimodel Video Retrieval Task 7

Ontology-Semantic Alignment On Contrastive Video-Language Mo...

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7th International Conference on Computer Science and Artificial Intelligence, CSAI 2023

作者： Zhou, Yifan Ding, Yizhou Dong, Yuwu He, Hao Shanghai Jiao Tong University State Key Lab of Advanced Optical Communication System and Network Shanghai China

ISBN: (纸本)9798400708688

Contrastive Learning-based models have shown impressive performance in text-image retrieval tasks. However, when applied in video retrieval, traditional contrastive learning strategies have faced challenges in achieving satisfactory results due to redundancy of video contents. We discern several potential reasons: (1)Current methodologies sometimes overlook the significant information imbalance between videos and query text, specifically neglecting the in-depth textual representation of the content within the videos. (2) Current video matching methodologies typically focus on cross-model alignment at general entity similarity level, without specific consideration for how entity pair preferences and similarity properties affect the task at hand. (3) Previous vectorized retrieval based on video content features have been somewhat flawed. They primarily focused on aligning overall features without having an video content tags feature for meaningful feature discrimination. Considering the shortcomings identified in the mentioned three aspects, we propose an ontology semantic labels augments retrieval model and introduce a method to integrate video ontology semantic labels into the contrastive learning framework. In particular, we have developed ontology semantic descriptions about entities encompassing both human figures and textual elements within the videos. Subsequently, we conducted training and testing on the CMIVQA dataset to assess the performance of our approach. The experimental results show that employing fine-grained ontology labels as sample pairs for contrastive learning leads to an increased level of precision in video retrieval tasks. © 2023 ACM.

关键词： Ontology

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LDSeq: Latent Diffusion Models for Sequence to Sequence Text Generation 7

LDSeq: Latent Diffusion Models for Sequence to Sequence Text...

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7th International Conference on Computer Science and Artificial Intelligence, CSAI 2023

作者： Ding, Yizhou Tian, Jidong Mei, Shanxing Zhou, Yifan Dong, Yuwu He, Hao Hu, Weisheng State Key Lab of Advanced Optical Communication System and Network Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9798400708688

Diffusion models have demonstrated remarkable success in generating continuous data, such as images and audios. Previous studies on text generation employing continuous diffusion models have revealed the potential of the diffusion framework. However, challenges like embedding collapse persist, limiting the overall generation performance. In this paper we introduce LDSeq, a latent diffusion framework employing a two-stage training procedure for sequence-to-sequence text generation. In the proposed framework, we first train a Variational Auto-Encoder (VAE) on downstream datasets to compress the target text of samples into a continuous latent space, and then we train a conditional latent diffusion model in the fixed continuous latent space, where the latent vectors are iteratively sampled conditioned on the input source text. The disjoint training stages prevent the collapse of diffusion space. Experimental results on paraphrase generation and text summarization datasets show that LDSeq achieves comparable or superior performance in comparison to AR and NAR baselines while requiring lower training cost. Furthermore, We discuss some potential future directions for enhancing diffusion models in the text generation domain. © 2023 ACM.

关键词： Diffusion

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Ultrahigh Resolution Fiber-Optic Quasi-Static Strain Sensors for Geophysical Research

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Photonic Sensors 2013年第4期3卷 295-303页

作者： Zuyuan HE Qingwen LIU Tomochika TOKUNAGA State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai200240 China Department of Environment Systems University of Tokyo Chiba 277-8563 Japan

A review of our recent work on ultrahigh resolution optical fiber sensors in the quasi-static region is presented, and their applications in crustal deformation measurement are introduced. Geophysical research such as studies on earthquake and volcano requires monitoring the earth＇s crustal deformation continuously with a strain resolution on the order of nano-strains （ne） in static to low frequency region. optical fiber sensors are very attractive due to their unique advantages such as low cost, small size, and easy deployment. However, the resolution of conventional optical fiber strain sensors is far from satisfactory in the quasi-static domain. In this paper, several types of recently developed fiber-optic sensors with ultrahigh resolution in the quasi-static domain are introduced, including a fiber Bragg grating （FBG） sensor interrogated with a narrow linewidth tunable laser, an FBG based fiber Fabry-Perot interferometer （FFPI） sensor by using a phase modulation technique, and an FFPI sensor with a sideband interrogation technique. Quantificational analyses and field experimental results demonstrated that the FBG sensor can provide nano-order strain resolution. The sub-nano strain resolution was also achieved by the FFPI sensors in laboratory. Above achievements provide the basis to develop powerful fiber-optic tools for geophysical research on crustal deformation monitoring.

关键词： Ultrahigh resolution fiber Bragg grating frequency modulation crustal deformation measurement

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Enhanced minimum interference routing algorithms for elastic optical networks

Enhanced minimum interference routing algorithms for elastic...

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2013 18th OptoElectronics and communications Conference Held Jointly with 2013 International Conference on Photonics in Switching, OECC/PS 2013

作者： Yi, Fang Guo, Bingli Xin, Chen He, Yongqi Li, Zhengbin State Key Lab. of Advanced Optical Communication Systems and Networks Peking University Beijing China

This work introduces for the first time the notion of minimum interference to the RSA algorithm design and proposes two novel RSA algorithms for EON. Our results show a noticeable spectrum efficiency improvement. ... 详细信息

ISBN: (纸本)9784885522710

关键词： Optoelectronic devices

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Flexible traffic-aware OXC architecture for hybrid WDM network and elastic optical network

Flexible traffic-aware OXC architecture for hybrid WDM netwo...

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Asia communications and Photonics Conference, ACPC 2014

作者： Chen, Xin Li, Juhao Zhu, Paikun Tang, Ruizhi Guan, Jing Chen, Zhangyuan He, Yongqi State Key Lab. of Advanced Optical Communication Systems and Networks Peking University Beijing China

We propose a novel flexible traffic-aware OXC architecture for hybrid WDM and elastic optical network. The simulation results show that the proposed OXC can save CAPEX significantly while providing similar blocking pe... 详细信息

ISBN: (纸本)9781557528520

关键词： network architecture

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Experimental demonstrations of symmetirc 40-Gb/s TWDM-PON

Experimental demonstrations of symmetirc 40-Gb/s TWDM-PON

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9th International Conference on Information, communications and Signal Processing, ICICS 2013

作者： Yi, Lilin Li, Zhengxuan Bi, Meihua He, Hao Wei, Wei Xiao, Shilin Hu, Weisheng State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University China

ISBN: (纸本)9781479904341

We have experimentally demonstrated symmetric 40Gb/s TWDM-PON with long passive reach and high power budget. Directly-modulated lasers (DMLs) are used as both downstream and upstream lasers to reduce the system cost, and optical reshaping filter is used to manage the chirp of the DMLs for all the upstream and downstream channels, enabling long distance transmission without dispersion compensation. The power budget is as high as 43 dB for 100-km passive reach, supporting 64 users. © 2013 IEEE.

关键词： Budget control

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Mutual optical format conversion between on-of keying and binary phase-shift keying based on stimulated brillouin scattering

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Chinese Optics Letters 2013年第10期11卷 15-17页

作者：张严义理林张涛李正璇胡卫生 State Key Lab of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University

We propose and experimentally demonstrate mutual optical format conversion between signals characterized as 10-Gb/s nonreturn-to-zero on-of-keying(NRZ-OOK) and NRZ binary phase-shift keying(BPSK) types. The conversion is based on stimulated Brillouin scattering(SBS) in a single-mode optical fber. An OOK signal is converted into a BPSK signal through optical carrier absorption, for which a SBS loss of 30 MHz is used in long-haul transmission. The converted BPSK signal is reverted to an OOK signal with a corresponding SBS gain of 30 MHz for direct detection. The proposed OOK-to-BPSK and BPSK-to-OOK format conversions can be implemented in transmitter and receiver nodes by using a laser source as the Brillouin pump.

关键词： BPSK OOK Mutual optical format conversion between on-of keying and binary phase-shift keying based on stimulated brillouin scattering SBS

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