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High speed data encryption and decryption using stimulated Brillouin scattering effect in optical fiber

Proceedings of SPIE - The International Society for optical Engineering 2011年 8198卷

作者： Yi, Lilin Zhang, Tao Hu, Weisheng State Key Lab of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Department of Electronic and Engineering Shanghai 200240 China

ISBN: (纸本)9780819488398

A novel all-optical encryption/decryption method based on stimulated Brillouin scattering (SBS) effect in optical fiber is proposed for the first time. The operation principle is explained in detail and the encryption and decryption performance is experimentally evaluated. The encryption keys could be the SBS gain amplitude, bandwidth, central wavelength and spectral shape, which are configurable and flexibly controlled by the users. We experimentally demonstrate the SBS encryption/decryption process of a 10.86-Gb/s non-return-to-zero (NRZ) data by using both phase-modulated and current-dithered Brillouin pumps for proof-of-concept. Unlike the traditional optical encryption methods of chaotic communications and optical code-division-multiplexing access (OCDMA), the SBS based encryption/decryption technique can directly upgrade the current optical communication system to a secure communication system without changing the terminal transceivers, which is completely compatible with the current optical communication systems. © 2011 SPIE.

关键词： Cryptography

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Candidate ions for active optical clock and narrow-linewidth Ion laser

Candidate ions for active optical clock and narrow-linewidth...

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全国光电子与量子电子学技术大会

作者：庄伟陈景标 Institute of Quantum Electronics and State Key Laboratory of Advanced Optical Communication System & Network School of Electronics Engineering & Computer Science Peking University

Since the proposal of active optical clock[1,2], a number of neutral atoms with two-level, three-level, and four-level at thermal, laser cooled and trapped configurations have been investigated recently[1-11]. The potential quantum limited linewidth of the active optical clock is narrower than mHz, and to reach this unprecedented linewidth is possible since the thermal noise of cavity mode can

关键词： Candidate ions for active optical clock and narrow-linewidth Ion laser

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Combining sFlow and Tracker traffic analysis: A novel estimation approach for network-wide BitTorrent distribution

Combining sFlow and Tracker traffic analysis: A novel estima...

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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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Dynamic scheduling for workflow applications over virtualized optical networks

Dynamic scheduling for workflow applications over virtualize...

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IEEE Conference on Computer communications Workshops, INFOCOM Wksps

作者： Jingyu Ding Yan Wang Jiajin Le Yaohui Jin School of Computer Science & Technology Donghua Uinversity China Huawei Technology Company Limited China State Key Laboratory of Advanced Optical Communication System and Network Shanghai Jiaotong University China

ISBN: (纸本)9781457702495

Joint scheduling of both computation and communication resources for workflow based distributed computing application over optical networks has been studied recently. Most algorithms proposed in previous work are mainly based on static scheduling strategies with assumption that detail resource information and accurate performance prediction is available. In this paper, we propose to employ shared virtualized optical network (VON) for the task scheduling problem. Both customers and carriers can benefit from such architecture with better flexibility and scalability. Based on a new Scheduled Result Graph (SRG) concept, we propose a computation and communication delay aware rescheduling (C 2 DAR) scheme to deal with the dynamics from shared VON resources. We evaluate the performance of dynamic scheduling scheme over shared VON in comparison to the static scheduling over dedicated VON and entire optical network respectively. Simulation results also show that C 2 DAR scheme outperforms traditional computation delay aware rescheduling (CDAR) scheme under shared VON scenario.

关键词： Schedules Bandwidth Processor scheduling Dynamic scheduling Optimal scheduling Delay optical fiber networks

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Quantum-limited phase-matching effect in a Λ-type laser system

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Physical Review A 2011年第6期83卷 063846-063846页

作者： Deshui Yu Jingbiao Chen Department of Applied Physics The University of Tokyo Bunkyo-ku Tokyo 113-8656 Japan Institute of Quantum Electronics and State Key Laboratory of Advanced Optical Communication System & Network School of Electronics Engineering & Computer Science Peking University Beijing 100871 P.R. China

The theory of a quantum-limited phase-matching effect in a Λ-type lasing system is studied in detail based on the quantum Langevin approach. Two quasimonochromatic fields are directly generated based on two lasing transitions. We find that the coherence between two lasers can well exceed the linewidth of either laser field. This result denotes that two field phases match each other although either laser field has a high phase fluctuation. Unlike the phase-matching effect based on atomic absorption, the final coherence between two laser fields here is not limited by saturation broadening, and the higher laser intensities lead to a higher coherence. Additionally, based on a linear stability analysis, we find that the instability of the field steady state can substantially restrict the occurrence of this phase-matching effect in the bad-cavity limit for a high pump rate. We also discuss the spectrum of amplitude fluctuations of output fields, and the result shows that the squeezing of amplitude fluctuations at low frequencies for a single field oscillating inside the cavity is damaged in the case of two fields oscillating.

关键词： LASERS LIGHT amplifiers OPTOELECTRONIC devices NONLINEAR optics BASES (Linear topological spaces)

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Adiabatic Passage Based on the Calcium Active optical Clock

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Chinese Physics Letters 2010年第7期27卷 105-107页

作者：解晓鹏庄伟陈景标 Institute of Quantum Electronics and State Key Laboratory of Advanced Optical Communication System & Network School of Electronics Engineering & Computer Science Peking University Beijing 100871

We propose a new application of the optical adiabatic passage effect for the excitation of a thermal atomic beam, which will be used in the calcium active optical clock to produce population inversion. A comparison between the optical adiabatic passage effect and the Rabi π pulse is investigated, 99% of the calcium atoms in the atomic beam that has a wide velocity distribution will be excited to the upper state for population inversion using the adiabatic passage, while 76% at most will be excited to the excited state using the π pulse with suitable parameters.

关键词： ATOMIC beams optical properties NUCLEAR excitation MATRIX inversion CALCIUM PARTICLE beams

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Quantum Phase Transition of the Bosonic Atoms near the Feshbach Resonance in an optical Lattice

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Chinese Physics Letters 2010年第12期27卷 65-68页

作者：李犇陈景标 Institute of Quantum Electronics and State Key Laboratory of Advanced Optical Communication System ~z Network School of Electronics Engineering & Computer Science Peking University Beijing 100871

The quantum phase transition from the Mott insulator to the superfluid phases of the bosonic atoms trapped in an optical lattice, in which the on-site interaction carl be tuned by a Feshbach resonance, is investigated by a variational approach within mean-field theory. We derive an extended Bos^Hubbard model to describe this ultracold atomic system. By theoretical calculation and analysis, the phase diagram is shown clearly, and we find an exciting and novel phenomenon that is the appearance of the Mort insulator-sea （MI-sea）. Meanwhile, the experimental feasibility of observing the MI-sea is discussed by analyzing the published data related to the Fashbaeh resonance at present. Finally, the potential application of the MI-sea for quantum information processing and quantum computation is also discussed in detail

关键词： Atomic and molecular physics Quantum gases, liquids and solids Computational physics Statistical physics and nonlinear systems

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Dynamical Behavior of an Atomic Beam Interacting with a Fock state Light Field

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Chinese Physics Letters 2010年第1期27卷 100-103页

作者：李犇陈景标 Institute of Quantum Electronics and State Key Laboratory of Advanced Optical Communication System & Network School of Electronics Engineering & Computer Science Peking University Beijing 100871

The collapse and revival of evolution with photon number of population inversion in the case of an atomic beam with velocity distribution interacting with a single-mode and Fock-state light field is investigated by full quantum theory. Compared to the previously reported coherent state case [Li B and Chen J B Chin. Phys. Lett. 26（2009）123203], which was induced by evolution with coupling strength of population inversion, in the case under consideration there exists Poisson distribution of photon numbers and atomic velocity distribution in the beam. Moreover, we prove that above, the collapse and revival have an analogy with conventional collapse and revival [Eberly J H et al. Phys. Rev. Lett. 44（1980）1323] in both the mathematical expression and physical significance.

关键词： Chinese climate network complex systems small world community

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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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Theory of quenching quantum fluctuations of a laser system with a ladder-type configuration

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Physical Review A 2010年第2期81卷 023818-023818页

作者： Deshui Yu Jingbiao Chen []Institute of Quantum Electronics and State Key Laboratory of Advanced Optical Communication System & Network School of Electronics Engineering & Computer Science Peking University Beijing 100871 People’s Republic of China and State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai 200062 People’s Republic of China

The theory of a laser system with a ladder-type configuration is studied in detail based on the quantum Langevin approach. By using an external field to link the lower lasing level with another atomic level, whose decay rate is much larger, laser intensity significantly increases and the quantum-limited linewidth can be quenched. We also discuss the spectrum of fluctuations of the output field, and the result shows that the fluctuations at low frequencies can be much suppressed too. On the other hand, this quenching approach can realize a laser output between two atomic levels, whose decay rates do not satisfy the usual lasing condition that the decay rate of the lower lasing level should be larger than that of the upper lasing level. It will be very useful to realize a laser output with the wavelength we want. This quenching approach has been widely used in the absorption spectrum of the ytterbium optical lattice clock and in the laser cooling approach for calcium atoms. Here we apply it in the stimulated emission of lasers.

关键词： Ladders

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