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9th International Conference on Optical Communications and networks (ICOCN 2010)

作者： Shiming Gao Zhiqiang Li Yanqiao Xie Qiang Liu Xingzhi Zhang Yaocheng Shi Sailing He En-Kuang Tien Ozdal Boyraz Centre for Optical Electromagnetic Research State Key Laboratory of Modern Optical Instrumentation University of Zhejiang Hangzhou China Advanced Photonics Device and System Laboratory Department of Electrical Engineering and Computer Science University of California Irvine Irvine CA USA

All-optical wavelength conversion is investigated using four wave mixing in silicon waveguides. The influences of nonlinear losses caused by two-photon absorption (TPA) and TPA-induced free-carrier absorption on the conversion efficiency and phase-matching condition are analyzed. The conversion bandwidth is tempted to enhance by optimizing the waveguide geometry and using the two-pump regime. And finally an angled-polarization pump is used to realize the polarization-independent wavelength conversion by eliminating the polarization discrepancy between the TE and TM modes.

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Four-level superradiant laser with full atomic cooperativity

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Physical Review A 2010年第5期81卷 053809-053809页

作者： Deshui Yu Jingbiao Chen Department of Applied Physics Graduate School of Engineering 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 People's Republic of China State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai 200062 People's Republic of China

We investigate a four-level superradiant laser whose intensity is proportional to N2 and whose linewidth scales as 1/N2. In the absence of spontaneous emissions, we derive the stationary solutions of the atomic full cooperativity, analyze their stabilities, and find the corresponding irreducible representation based on group U(4). We also investigate the spectra of the phase and amplitude fluctuations of the fields inside and outside the cavity and find that the amplitude fluctuations of the output fields cannot be squeezed in the low-frequency limit, which is completely different from the three-level superradiant laser system. Finally, we consider the stationary solutions corresponding to the partial cooperativity due to the symmetry breaking of U(4) induced by the atomic spontaneous emissions.

关键词： Spontaneous emission

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Widely tunable multiband reconfigurable patch antenna for wireless applications

Widely tunable multiband reconfigurable patch antenna for wi...

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European Conference on Antennas and Propagation, EuCAP

作者： H. F. AbuTarboush R. Nilavalan K M. Nasr H. S. Al-Raweshidy D. Budimir Wireless Network & Communication Centre School of Engineering & Design Brunei University West London UK Wireless Communication Technologies National Physical Laboratory Teddington UK Wireless Communications Research Group Department of Electronics & Computer Science Westminster University UK

A design of a low profile reconfigurable microstrip patch antenna is presented. The antenna consists of four sup-patches connected to one feed line, each sub-patch generates a single band. By placing a variable capacitor at the input of the sub-patches, the impedance matching frequency of the antenna can be tuned over a wide range starting from 0.92 GHz to 2.98 GHz with total tunability rang of 2060 MHz. The proposed antenna designed to operate in the Global system for Mobile communication (GSM900, 880-960 MHz)/ Digital Communication system (DCS1800, 1710-1880 MHz)/ Universal Mobile Telecommunication system (UMTS, 1920-2170 MHz)/ Wireless Local Area network (WLAN, 2400-2483.5 MHz)/ and Worldwide Interoperability for Microwave Access (WiMAX, 2495-2700 MHz). The total size of the proposed antenna is 50 × 50 mm 2 which is suitable for small wireless devices.

关键词： Patch antennas Wireless LAN Microstrip antennas Antenna feeds Capacitors Impedance matching Frequency Microwave antennas Mobile antennas GSM

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A reconfigurable H-shape antenna for wireless applications

A reconfigurable H-shape antenna for wireless applications

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European Conference on Antennas and Propagation, EuCAP

作者： H. F. AbuTarboush R. Nilavalan K. M. Nasr H. S. Al-Raweshidy D. Budimir Wireless Network & Communication Centre School of Engineering & Design Brunei University West London UK National Physical Laboratory (NPL) Wireless Communication Engineering Technologies Teddington UK Wireless Communications Research Group Department of Electronics & Computer Science Westminster University West London UK

This paper presents a novel H-Shaped reconfigurable microstrip patch antenna fed by a Grounded Coplanar Waveguide (GCPW) for wireless applications. The uniqueness in the presented antenna design relies in the ability to select the number of operating frequencies electronically by using a varactor diode. The antenna structure consists of coplanar waveguide (CPW) input with an H-shape printed on a PCB and a varactor diode for reconfigurability. By electronically varying the value of the diode capacitance, the antenna can operate in a single band mode to cover Global Position system (GPS), a dual band mode to cover GPS and Global system for Mobile communications (GSM1900) or a three-band mode to cover GPS, GSM1900 and Bluetooth or Wireless Local Area networks (WLAN).

关键词： Coplanar waveguides Diodes Global Positioning system Varactors Wireless LAN Microstrip antennas Patch antennas Frequency Capacitance Mobile antennas

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A novel method to implement an interactive mobile robot

A novel method to implement an interactive mobile robot

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IEEE International Conference on Advanced Robotics and its Social Impacts

作者： Lee, Wen-Yo Guo, Jhu-Syuan Pao, Chan-An Hung, Ta-Chih Computer Information and Network Engineering Lunghwa University of Science and Technology Taoyuan Taiwan Mechanical and System Research Laboratory Industrial Technology Research Institute Hsinchu Taiwan

ISBN: (纸本)9781424443949

This paper presents a novel method to implement an interactive mobile robot. The proposed mobile robot is implemented under the technique of mixed reality. The mixed reality technique is realized by both the Virtools tool and mobile robot. There are three basic interactive behaviors of human beings have been implemented on this proposed mobile robot. There are target navigation behavior, face tracking behavior, and obstacle avoidance behavior;the three behaviors are designed by the fuzzy rules method, respectively. These behaviors lead to the proposed path planning strategy possibly. On the other hand, a novel path planning strategy for a mobile robot is given in this paper. The path planning strategy is according to the experience that the mobile robot has been experienced in target navigation. Experiments show that the proposed behaviors are well designed. With the basic ability of the behaviors, the proposed robot can automatically learn from the previous navigation experience and can optimize the path planning. © 2009 IEEE.

关键词： Mobile robots

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An automatic wavelength control method of a tunable laser for a WDM-PON

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IEEE Photonics Technology Letters 2009年第5期21卷 325-327页

作者： Moon, Jung-Hyung Choi, Ki-Man Mun, Sil-Gu Lee, Chang-Hee Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon 305-701 Korea Republic of Next Generation Research Department Korea Telecom Network Technology Laboratory Daejeon 305-811 Korea Republic of

We propose a novel automatic wavelength control method of a tunable laser for a wavelength-division-multiplexed passive optical network (WDM-PON). By sending a low-power amplified spontaneous emission light generated from a broadband light source (BLS) to a tunable laser through a wavelength-division multiplexer, we match the wavelength of the tunable laser to a peak transmission wavelength of the multiplexer. The deviation of the wavelength of the tunable laser was less than 0.05 nm from the center of the target channel. We demonstrate up to 10-Gb/s transmission in a WDM-PON by using the proposed method. We also show that system impairments induced by the BLS are negligible. © 2009 IEEE.

关键词： Passive optical networks

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Abstracts from the 2011 Joint Annual Meeting of the Society for Northwestern Vertebrate Biology and Washington Chapter of the Wildlife Society, Held at the Wesley Inn, Gig Harbor, Washington, March 23–25, 2011

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Northwestern Naturalist 2011年第2期92卷 136-166页

作者： Michael J. Adams Christopher A. Pearl Jessica Y. Adkins Daniel D. Roby Ladd Bayliss Peter J. Loschl Donald E. Lyons Yasuko Suzuki Hannah E. Anderson Sarah T. Hamman Keith B. Aubry Catherine M. Raley John J. Rohrer Eric C. Lofroth Scott H. Fitkin Michael L. Best Hartwell H. Welsh Jamie B. Bettaso Don T. Ashton Hartwell H. Welsh Scott McBain Lindsay M. Biga Andrew R. Blaustein Susan F. Brady R. Steven Wagner Daniel J. Selski James E. Johnson R. Bruce Bury Wynn W. Cudmore Hartwell H. Welsh Nathan D. Chelgren Tara Chestnut Chaucney W. Anderson Julie Kirshtein Megan T. Cook Tiffany S. Garcia Stephen Corn Erin Muths Amanda Kissel Rick Scherer Eric Delvin Jonathan D. Bakker Peter W. Dunwiddie Diana L. Dishman Deborah A. Duffield Harriet R. Huber Dyanna M. Lambourn Karen M. Dvornich Greg Falxa Gary M. Fellers Patrick M. Kleeman David Miller Brandon Fessler Jason T. Irwin Daniel D. Beck R. Steven Wagner Marc P. Hayes John A. Frew Christian E. Grue Chris R. Friesen Robert T. Mason Stevan J. Arnold Suzanne Estes Tiffany S. Garcia Katie M. Dugger Josh Johnson Mike Rochelle A. J. Kroll Stephanie S. Gervasi Caren S. Goldberg Dan Davis Erica Bree Rosenblum Bill Bosworth Lisette P. Waits Purnima Govindarajulu Gregory A. Green Steve Negri Jennifer R. Griffiths Daniel E. Schindler Christian E. Grue Karen M. Dvornich Adam G. Hansen David A. Beauchamp Casey M. Baldwin Marc P. Hayes Gretchen Padgett-Flohr Blake R. Hossack Winsor H. Lowe Paul Stephen Corn Aaron N. Johnston Kris Kendell Dave Prescott Scott Stevens Peter M. Kiffney Carol Volk Kerensa A. King Christian E. Grue James M. Grassley Andrew J. Kroll Matt Hane Josh Johnston Mike Rochelle Stuart Farber Niels Leuthold Michael J. Adams John P. Hayes Bo Li Michael T. Brett Kent B. Livezey Ilon E. Logan Teresa J. Lorenz Kimberly A. Sullivan Amanda V. Bakian Deanna Lynch Nancy Thomas Krysten Schuler Steven Jeffries Joshua Malt Kelly R. McAllister Joanne P. Schuett-Hames Aimee P. McIntyre Jay E. Jones Eric M. Lund Frithiof T. Waterstrat Jack N. Giovanini Stephen D. Duke Marc P. Hayes US Forest Service Pacific Northwest Research Station Olympia WA 98512 kaubry@fs.fed.us US Forest Service Okanogan-Wenatchee National Forest Methow Valley Ranger District Winthrop WA 98862 British Columbia Ministry of Environment Victoria BC V8W9M1 Washington Department of Fish and Wildlife Winthrop WA 98862 Humboldt State University 1 Harpst St. Arcata CA 95521 addsmike14@*** US Forest Service Pacific Southwest Research Station 1700 Bayside Dr. Arcata CA 95521 hwelsh@fs.fed.us US Fish and Wildlife Service Arcata Field Office 1655 Heindon Road Arcata CA 95521 jamie_bettaso@fws.gov Redwood Sciences Laboratory US Forest Service1700 Bayview Drive Arcata CA 99521 dashton@fs.fed.us hwelsh@fs.fed.us McBain &amp Trush 980 7th Street Arcata CA 95521 scott@*** Oregon State University Environmental Sciences Graduate Program Corvallis OR 97331 lindsay.biga@science.oregonstate.edu Oregon State University Department of Zoology Corvallis OR 97331 US Geological Survey Forest and Rangeland Ecosystem Science Center 3200 SW Jefferson Way Corvallis OR 97331 buryb@usgs.gov Life Science Department Chemeketa Community College Salem OR 97309 wynn.cudmore@chemeketa.edu US Forest Service Redwood Sciences Laboratory 1700 Bayview Drive Arcata CA 95521 hwelsh@fs.fed.us USGS Oregon Water Science Center 2130 SW 5th Avenue Portland OR 97207 chestnut@usgs.gov USGS Headquarters 12201 Sunrise Valley Drive Reston VA 20192 US Geological Survey Northern Rocky Mountain Science Center Aldo Leopold Wilderness Research Institute 790 E. Beckwith Avenue Missoula MT 59801 scorn@usgs.gov US Geological Survey Fort Collins Science Center 2150 Centre Avenue Building C Fort Collins CO 80526 Department of Biological Sciences Simon Fraser University Burnaby BC V5A 1S6 Colorado State University Department of Fishery and Wildlife Biology Fort Collins CO 80523 The Nature Conservancy 120 Union Ave SE Olympia WA 98501 edelvin@tnc.org School of Forest Resources University of Washington Seattle WA

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A centralized traffic control mechanism for evacuation of emergency vehicles using the DSRC protocol

A centralized traffic control mechanism for evacuation of em...

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2009 4th International Symposium on Wireless and Pervasive Computing, ISWPC 2009

作者： Huang, Chung-Ming Yang, Chia-Ching Tseng, Chun-Yu Chou, Chih-Hsun Laboratory of Multimedia Mobile Networking Department of Computer Science and Information Engineering National Cheng Kung University Tainan Taiwan Network and Multimedia Research Institute Institute for Information Industry Taipei Taiwan

ISBN: (纸本)9781424429660

Emergency service vehicles need safety and fluent paths to save time. In this paper, a centralized traffic control mechanism is proposed for the evacuation of vehicles that drive toward the dedicated path of the emergency vehicles (EV), e.g. Ambulance, Fire Engines, Police Cars, etc, using the Dedicated Short Range Communications (DSRC) protocol. In our proposed mechanism, a centralized server is used to monitor and control all traffic information to support real time traffic information and services for emergency vehicles, and the centralized server also calculates the shortest path for emergency vehicles to pass by. If the approaching information of emergency vehicles is not announced in advance to other vehicles that will obstruct the approaching path of emergency vehicles, it will cause the traffic muddle on the road and increase the delayed time for emergency vehicles. Thus, we also propose a data dissemination scheme to transmit the warning messages to other vehicles that will obstruct the approaching road of emergency vehicles. In our experiment, we will exhibit the performance of our proposed system. © 2009 IEEE.

关键词： Telematics

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Analysis of Line Monitoring Device network using centralized failure troubleshooting system

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Journal of Optical Communications 2009年第2期30卷 86-90页

作者： Ab-Rahman, Mohammad Syuhaimi Ng, Boonchuan Jumari, Kasmiran Computer and Network Security Research Group Department of Electrical Electronic and System Engineering Faculty of Engineering and Built Environment 43600 UKM Bangi Selangor Malaysia

An optical time domain reflectometer (OTDR) is an instrument that used to measure parameters such as attenuation, length, connectors and splice losses, reflectance level and locating faults in an optical link. The measurement results are saved in OTDR and then transfer into computer for further analysis by using computerbased emulation software for performing more OTDR trace processing. In this paper, we proposed and demonstrated a new in-line monitoring and testing system based on Line Monitoring Device (LMD) and Centralized Failure Detection system (CFDS) for transmission surveillance and failure detection without affecting the transmission in an optical access network. LMD is passive device for optical signals tapping purpose;meanwhile CFDS is a centralized monitoring and troubleshooting solution with the GUI processing in MATLAB software. The LMD network will be analysis through both programs by means of OTDR installed software and our CFDS. The results are eventually compared and show both are reliable with the second is able to be extended for further analysis. Any fiber failure or breakdown occurs in the network will be determined by CFDS while the LMD is used to determine sharply the point of failure before it is been repaired. The proposed systems are able to improve the service reliability and reduce the repairing cost and time.

关键词： Time domain analysis

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Analytical analysis of limited power penalty on optical cross add and drop multiplexer (OXADM) - With OXC comparison

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Journal of Optical Communications 2009年第3期30卷 179-185页

作者： Ab-Rahman, Mohammad Syuhaimi Md. Nor, Mohd Khairul Anwar Dollah, Mohd Norhisham Department of Electrical Electronic and System Engineering Spectrum Technology Research Division Computer and Network Security Research Group 43600 UKM Bangi Selangor Malaysia

This paper highlights the limited power penalty condition of OXADM that effect the number of maximum nodes that can be cascaded in optical network. If the limited power penalty condition is violated, the power penalty will become infinity. The condition for limited power penalty for OXADM occur when incoherent crosstalk multiply with the number of maximum nodes;(MN-1)L. Therefore the value must be less than 174, otherwise it will become infinity. It was found that as the number of ports and number of carriers increase, the number of maximum nodes decrease. When compared with conventional OXC device, it was found that the number of maximum nodes for OXC is larger than OXADM. This is due to large power penalty in OXADM. In addition, the accumulation function in OXADM reduces the scalability of this device. The objective of this paper is to study the limited power penalty condition of OXADM in order to avoid infinity. In addition, according to the limited power penalty condition, the relationship between number of maximum nodes against number of ports and number of carriers are also studied. Hence, the results are compared with conventional OXC device.

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