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network Architectures, Management, and Applications VII

作者： Zhang, Xinxin Ye, Wei Jin, Yaohui State Key Lab of Advanced Optical Communication System and Network Shanghai Jiao Tong Univ. Shanghai China

ISBN: (纸本)9780819480354

Recent studies have shown that path diversity provided by overlay networks brings about possibilities to choose alternate optimal path against default one. In the present paper, we present a novel routing mechanism which chooses path based on a composite metric, whose comprising individual metrics are determined by active probing measurements including delay, jitter and bandwidth on the overlay network in a real-time fashion. The applicability of this mechanism is examined under overlay emulation environment, which is supported by the performance data collected from a real enterprise overlay network. © 2009 SPIE-OSA-IEEE.

关键词： network routing

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Experimental Scheme of 633 nm and 1359 nm Good-Bad Cavity Dual-Wavelength Active optical Frequency Standard

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Chinese Physics Letters 2015年第8期32卷 57-61页

作者：许志超潘多庄伟陈景标 State Key Laboratory of Advanced Optical Communication System and Network Institute of Quantum Electronics School of Electronics Engineering & Computer Science Peking University Beijing 100871 National Institute of Metrology Beijing 100013

The experimental scheme of 633 nm and 1359 nm good-bad cavity dual-wavelength active optical frequency stan- dard is proposed, where He-Ne 633nm and Cs 1359nm stimulated emissions are working at good-cavity and bad-cavity regimes, respectively. The cavity length is stabilized by locking the 633nm output frequency to a super-cavity with the Pound Drever-Hall （PDH） technique. The frequency stability of 1359 nm bad-cavity stim- ulated emission output is then expected to be further improved by at least 1 order of magnitude than the 633nm PDH system due to the suppressed cavity pulling effect of active optical clock, and the quantum limited linewidth of 1359nm output is estimated to be 72.5 mHz.

关键词： length Experimental Scheme of 633 nm and 1359 nm Good-Bad Cavity Dual-Wavelength Active optical Frequency Standard

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Implementation of Full Spin-state Interferometer

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Chinese Physics Letters 2019年第5期36卷 7-11页

作者： Peng-Ju Tang Peng Peng Xiang-Yu Dong Xu-Zong Chen Xiao-Ji Zhou State Key Laboratory of Advanced Optical Communication System and Network School of Electronics Engineering and Computer SciencePeking UniversityBeijing 100871 Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006

Matter-wave interferometers with spin quantum states are attractive in quantum manipulation and precision measurements. Here, five spatial interference patterns corresponding to the full spin states are observed in each run of the experiment, by the combination of the Majorana transition according to the exponential modulation of the magnetic field pulse decline curve and radio frequency coupling among multiple magnetic *** to the realization of two Majorana transitions, the interference fringe for the magnetic field insensitive state also has a higher contrast. After spatially overlapping the full magnetic sub-state interference patterns dozens of times in consecutive experimental measurements, clear fringes are still observed, indicating the great stability of the relative phases of different components. This indicates the potential to achieve an interferometer with multiple spin clocks.

关键词： In Implementation of Full Spin-state Interferometer

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An insertion loss balance aware routing scheme in photonic network on chip

An insertion loss balance aware routing scheme in photonic n...

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7th International Conference on Information, communications and Signal Processing, ICICS 2009

作者： Chang, Zhijuan Tang, Jianxiong Jin, Yaohui State Key Lab. of Advanced Optical Communication System and Network Shanghai Jiao Tong University Shanghai 200240 China

ISBN: (纸本)9781424446575

The paper presents a novel energy efficient routing scheme for photonic network on chip (PNoC) based on the micro-resonator which takes the insertion loss and the path-setup latency into consideration in order to design a high performance per watt multi-processors. The path-setup latency is a major contributor to the whole system's latency that has something to do with queuing. And insertion loss which has impact on power consumption is closely related to the number of micro-resonators in on state. To solve the multi-objective optimization problem, we design a straight line first heuristic routing scheme. The goal of this routing scheme is to reduce the path-setup latency and insertion loss. Simulation results show that this scheme can low the latency with lower the insertion loss as little as possible. ©2009 IEEE.

关键词： Insertion losses

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Cs 5D_(5/2)-6F 728 nm Laser Spectroscopy with Single Pumping Laser

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Chinese Physics Letters 2017年第3期34卷 53-56页

作者：周琦常鹏媛刘忠征张晓刚祝传文陈景标 School of Optoelectronic Information University of Electronic Science and Technology of China State Key Laboratory of Advanced Optical Communication System and Network Institute of Quantum ElectronicsSchool of Electronics Engineering & Computer SciencePeking University

The sub-Doppler absorption laser spectroscopy at 728nm transition from the 5D5/2 state to the 6F state of cesium with linewidth near 10 MHz is first experimentally performed with indirect pumping from the ground state 6S1/2 to the state 7P3/2 by a 455.5nm diode laser. Using a 455.5nm diode laser as an indirect pump laser, several excited states will be populated due to spontaneous decay from the 7P state. We first implement the sub-Doppler absorption laser spectroscopy at 728nm from the 5D5/2 state to the 6F state when Cs atoms within thermal glass cell decay to the 5D5/2 state. Due to velocity transfer effect, the hyperfine structure of 5D5/2 shows a mixed and complicated pattern but very e/ear structure when the 455.5nm pumping laser is counter-propagating （or co-propagating） with the 728nm probing laser.

关键词： Cs 5D ab length nm Laser Spectroscopy with Single Pumping Laser FADOF

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Trajectory pattern change analysis in campus WiFi networks 2

Trajectory pattern change analysis in campus WiFi networks

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2nd ACM SIGSPATIAL International Workshop on Mobile Geographic Information systems, MobiGIS 2013, held in conjunction with the 21st ACM SIGSPATIAL International Conference on Advances in Geographic Information systems, GIS 2013

作者： Gong, Wenjuan Chen, Xiaming Qiang, Siwei Jin, Yaohui State Key Lab of Advanced Optical Communication System and Network Shanghai China Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9781450325318

Mobile devices equipped with geo-location modules facilitate researches on the nature of human mobility. While valuable contributions have been made to discover trajectory patterns from movement history, there are still not a comparative amount of works specialized in analyzing how trajectory patterns change over time. In this paper, we facilitate this problem in a systematic and quantified manner as identifying potential change points of user trajectory patterns extracted from successive time intervals. Specifically, we present a unified, information-based measure to quantify pattern changes between two intervals, and perform a Bayesian analysis on a sequence of aggregate measures for each individual interval to detect the actual change points. Experimenting on a three-month long dataset in real campus WiFi networks, we show that our approach is effective to identify trajectory pattern changes in practice with a discussion on the impact of internal parameters of proposed model on detection performance. Furthermore, we also inspect external factors influencing user mobility in reality by associating trajectory pattern changes with public events, and there shows an interesting connection between group pattern changes and real-world principles such as the weekday calendar or public events such as the May Day holiday. © 2013 ACM.

关键词： Trajectories

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Cs 728 nm Laser Spectroscopy and Faraday Atomic Filter

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Chinese Physics Letters 2014年第12期31卷 27-30页

作者：刘忠征陶智明蒋招杰陈景标 State Key Laboratory of Advanced Optical Communication System and Network Institute of Quantum Electronics School of Electronics Engineering ~ Computer Science Peking University Beijing 100871 College of Science Guizhou University of Engineering Science Bijie 551700

The laser spectroscopy of alkali-metal vapor is widely used in a number of applications, such as the Faraday anomalous dispersion optical fil- ter （FADOF）, the active optical clock, and wavelength ***＇ The Cs electrodeless dis- charge vapor lamp has rich spectra, including 455 nm, 459 nm, 728 nm, 852 nm, 1359 nm, and 1470 nm. The 852 nm laser pumping atoms from 6S1/2 to 6P3/2 have been used in *** 1359nm wave- length transited from 7S1/2 to 6P1/2 of Cs atoms can be used in the field of active optical clocks. The concept of active optical clocks has been proposed since 2005. Due to its good performance in sta- bility, the active optical clock has been extensively in- vestigated theoretically and experimentally in recent years, such as the two-level active optical clock, and three-level active optical clock. When considering the performance of the active optical clock, we hope to reduce the second-order Doppler shift in thermal atomic beam and the light shift induced by the pump- ing laser. To solve this issue, our group has recently proposed a four-level active optical clock, such as K 1252.2nm, Cs 1469nm, Rb 1366.9nm and Rb 728 nm. Moreover, the Rb 728 nm four-level quantum system has potentially a better performance than three long wavelength ones of Rb.

关键词： LASER spectroscopy CESIUM FARADAY effect INDUCTION lamps PHASE transformations (Physics) LIGHT filters

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Dual-Wavelength Bad Cavity Laser as Potential Active optical Frequency Standard

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Chinese Physics Letters 2015年第9期32卷 31-34页

We experimentally realize the dual-wavelength bad cavity laser for the first time. As the Cs cell temperature is kept between 118℃ and 144℃, both the 1359nm and 147Ohm lasing outputs of dual-wavelength bad cavity laser are detected. The laser output power of dual-wavelength bad cavity laser is measured when changing the 455 nm pumping laser frequency and power at 127℃ Cs cell temperature. Both the 1359 nm laser and the 1470 nm laser are working at the deep bad cavity regime, and the ratio between the linewidth of cavity mode and the laser gain bandwidth a ≈ 40 for 1359nm and 1470nm lasers. The 147Ohm laser linewidth is measured to be 407.3Hz. The dual-wavelength bad cavity laser operating on atomic transitions demonstrated here has a potential in the application as a stable optical local oscillator, even an active optical frequency standard directly in the future.

关键词： Dual-Wavelength Bad Cavity Laser as Potential Active optical Frequency Standard As Cs length

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IP over optical multicasting for large-scale video delivery

IP over optical multicasting for large-scale video delivery

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network Architectures, Management, and Applications V

作者： Jin, Yaohui Hu, Weisheng Sun, Weiqiang Guo, Wei State Key Laboratory on Advanced Optical Communication System and Network Shanghai Jiao Tong University Shanghai 200240 China

ISBN: (纸本)9780819469472

In the IPTV systems, multicasting will play a crucial role in the delivery of high-quality video services, which can significantly improve bandwidth efficiency. However, the scalability and the signal quality of current IPTV can barely compete with the existing broadcast digital TV systems since it is difficult to implement large-scale multicasting with end-to-end guaranteed quality of service (QoS) in packet-switched IP network. China 3TNet project aimed to build a high performance broadband trial network to support large-scale concurrent streaming media and interactive multimedia services. The innovative idea of 3TNet is that an automatic switched optical networks (ASON) with the capability of dynamic point-to-multipoint (P2MP) connections replaces the conventional IP multicasting network in the transport core, while the edge remains an IP multicasting network. In this paper, we will introduce the network architecture and discuss challenges in such IP over optical multicasting for video delivery.

关键词： Multicasting

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optically Pumped Cesium Beam Clock Using Monochromatic Light

Optically Pumped Cesium Beam Clock Using Monochromatic Light

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2023 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium, EFTF/IFCS 2023

作者： Liu, Chen Li, Yuanhao Chen, Sifei Fan, Lifeng Wang, Yanhui School of Electronics State Key Laboratory of Advanced Optical Communication System and Network Peking University Beijing100871 China

We propose a new method about optically pumped cesium beam clock. Due to the magnetic field of selecting magnet, the pumping light and detection light use the same frequency laser which makes system structure simpler.... 详细信息

ISBN: (纸本)9798350311426

关键词： Atomic clock Cesium beam Frequency standard optical pumping

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