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International Conference on computer Technology and Development (ICCTD)

作者： Mohammad Syuhaimi Ab-Rahman Mazen R. Hassan Computer & Network Security Research Group Faculty of Engineering & Built Environment Department of Electrical Electronic and Systems Engineering University Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

In this paper, the effect of external optical feedback (EOF) on the turn-on time delay (t on ) of uncooled semiconductor laser diode (SLD) is investigated theoretically. The effects temperature of operation (T) and EOF on t on are calculated according to their effect on threshold carrier density (N th ). The temperature dependence (TD) of N th is calculated according to the TD of laser cavity parameters and not by the well-known Parkove relationship. Simulation results show that t on increases as T increases due to increasing of N th . In addition, t on decreases as external reflectivity (r ext ) increases when the phase of reflected light is coherent. While at incoherent reflected light, t on increases sharply around specified value of r ext where this leads to inoperable case for SLD.

关键词： Delay effects Diode lasers Optical feedback Superluminescent diodes Temperature Laser feedback Charge carrier density Laser theory Reflectivity Optical fiber networks

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Automatic Protection Unit in Application of Restoration Scheme for FTTH Passive Optical network

Automatic Protection Unit in Application of Restoration Sche...

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International Conference on computer Technology and Development (ICCTD)

作者： Siti Asma Che Aziz Mohammad Syuhaimi Ab Rahman Kasmran Jumari Department of Electrical Electronic and Systems Engineering Computer and Network Security Research Group Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

Fiber to the home (FTTH) network security has become a very essential and important topic for optical network. Fault isolation became important issues in order to provide an efficient FTTH network and simultaneously will provide continuous services to the end user without being interrupted by any failure in fiber line. Protection scheme against the failure in distribution fiber line is carried out using our protection and restoration scheme. This paper focused on the implementation of automatic device switching to perform in restoration scheme located at distribution fiber section. This protection device is potentially will improve the system efficiency in order to provide the continuous data flow until it reach to the end user. We implement for immediate split structure in Fiber to the Home (FTTH-EPON) network when the signal is totally split when it pass through the optical splitter. Automatic Protection Unit (APU) is an automatic switching device designed as a package that offered for the ease of customer to perform security and self restoration at the end user side. While in this paper also includes the power penalty analysis for optical switch cascaded in our network protection design according to the APU device.

关键词： Optical fiber subscriber loops Passive optical networks Optical fiber networks Optical fiber devices Signal restoration Optical network units Power system protection Packaging Optical switches Optical design

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Lock-on range of infrared heat seeker missile

Lock-on range of infrared heat seeker missile

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International Conference on Electrical engineering and Informatics, ICEEI

作者： Mohammed Syuhaimi Ab-Rahman Mazen R. Hassan Computer & Network Security Research Group Faculty of Engineering & Built Environment Department of Electrical Electronic and Systems Engineering University Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

The lock-on range, R, of infrared (IR) heat seeker missile has been studied in details. An analytical expression form of R has been derived in term of target (assumed as aircraft hot metal tailpipe), atmosphere and infrared (IR) detector parameters. The R is represented in term of ldquoLambert W functionrdquo and as a function of target temperature, T, and atmosphere extinction coefficient, alpha. Assuming clear sky background, the simulation results show: firstly, R increases as the target temperature increases. High value of R is achieved when the temperature of aircraft engine is high especially in takeoff case where the engine thrust is large. Secondly, R can be decreased by (1) increasing the attenuation coefficient of the propagation medium, i. e. by cooling the aircraft hot engine or any other obscurants that absorb or scatter the IR radiation (2) or by decreasing emissivity , epsiv, of the target surface which depends on the applied coatings / paintings. The decreasing of R will increase the probability of aircraft survivability assuming effective aircraft early warning system where the detecting range of the latter should be larger than the missile lock-on range.

关键词： Infrared heating Missiles Aircraft propulsion Temperature Atmosphere Infrared detectors Engines Extinction coefficients Atmospheric modeling Attenuation

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Portable wireless CATV tester unit with solar panel

Portable wireless CATV tester unit with solar panel

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International Conference on Space Science and Communication (IconSpace)

作者： Mohammad Syuhaimi Ab-Rahman Suria Che Rosli Zurita Zakaria Faridah Jaafar Kasmiran Jumari Spectrum Technology Research Division Computer and Network Security Research Group Department of Electrical Electronic & Systems Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Bangi Malaysia

Fiber-to-the-home (FTTH) network system can transmit signal at a high speed level such as transmitting video, data and voice signals to the users. However, we do not know whether the send signals are in a good condition or not. Therefore, a community access television, CATV tester device is needed. An upgrading from first generation CATV tester unit, a wireless technology is applied through the implementation of audio video transmitter and receiver. This tester will display the received signal on the display panel, if the signal received by the CATV tester device is accompanied by undesired signals and noises, it will then indicate that the main (FTTH trunk line) is probably damaged and needed to be repaired. With the application of wireless technology, video signal that is transmitted through fiber optic cable located in the underground can be simply detected and determined whether it is functioning or not. An addition of solar panel as battery charger for power saving is also applied.

关键词： Optical fiber subscriber loops Auditory displays Optical fiber devices Optical fiber testing Optical transmitters Optical noise Optical fibers Cable TV Optical fiber cables Batteries

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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

引用

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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CATV tester unit for fiber-to-the-home

CATV tester unit for fiber-to-the-home

引用

International Conference on Space Science and Communication (IconSpace)

作者： Mohammad Syuhaimi Ab-Rahman Suria Che Rosli Faridah Jaafar Zurita Zakaria Kasmiran Jumari Spectrum Technology Research Division Computer and Network Security Research Group Department of Electrical Electronic & Systems Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Bangi Malaysia

Fiber-to-the-home (FTTH) network system is used to transmit video, data and voice signals to users at a high speed level. Therefore, good signals are essential. Thus, to monitor the condition of the signals, a CATV tester device is needed. CATV tester device is designed to measure the CATV signals which are passing through the optical network unit (ONU) at the user's premises. A single mode optical fiber signal entering the ONU will be obtained by `tapping' method and the signal then will be fed into the CATV tester unit through optical cable connection. The signals will be converted into audio/video signal and be fed to display panel. This tester will display the received signal on the display panel; if the signal received by the CATV tester device is accompanied by undesired signals and noises, video displayed would degrade; it will then indicate that the main (FTTH trunk line) is probably damaged and needed to be repaired.

关键词： Optical fiber testing Optical network units Auditory displays Optical fiber devices Optical fiber subscriber loops Condition monitoring Optical design Signal design Optical fibers High speed optical techniques

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Hardware Architecture of Protection Switching Device (PSD)

Hardware Architecture of Protection Switching Device (PSD)

引用

International Conference on computer Technology and Development (ICCTD)

作者： Boonchuan Ng Aswir Premadi Noor Azie Azura Mohd Arif Mohammad Syuhaimi Ab-Rahman Spectrum Technology Research Division Computer and Network Security Research Group Department of Electrical Electronics and Systems Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Selangor Darul Ehsan Malaysia

This paper presents the hardware architecture of a new optical switching device named Protection Switching Device (PSD) for providing protection and restoration against fiber failures/faults in the distribution region of passive optical network (PON). The developed PSD prototypes are employed at the customer end, just before the optical network units (ONUs) to ensure the data flow continuously due to breakdown occur in the network and instantly repair operation. The network is protected from fiber/equipment failures by using optical switches to bridge the optical signals and dual feed them on diversely routed working line and protection line or neighbor line. When the failure is detected, the protection mechanism will be activated and divert the optical signal direction to the protection line or neighbor line according to the types of failure condition and location of failures in PON.

关键词： Hardware Protection switching Passive optical networks Optical network units Optical fiber networks Optical devices Optical fiber devices Prototypes Electric breakdown Equipment failure

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Protection scheme of fiber to the home passive optical network using access control system

Protection scheme of fiber to the home passive optical netwo...

引用

IEEE Conference on Innovative Technologies in Intelligent systems and Industrial Applications (CITISIA)

作者： Aswir Premadi Mohammad Syuhaimi Ab-Rahman Ng Boon Chuan Mohamad Najib Mohamad Saupe Kasmiran Jumari Spectrum Technology Division Computer and Network Security Research Group Department of Electrical Electronics and Systems Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

This paper proposes and experimentally demonstrates an access control system (ACS) mechanism against distribution fiber fault in fiber to the home (FTTH) passive optical network (PON). ACS will be installed between with optical line terminal (OLT) at the central office (CO) to monitor and control each optical fiber line's status and detect the failure that occurs in the drop region of PON downstream from CO to the optical network unit (ONU). The technique is based on the remote host of optical switch, and the web-server would help discern an individual event during the monitoring of the FTTH PON in collaboration with the information provided by the optical switch. The FTTH-PON architecture can be analyzed by the monitoring method by using the OTDR at the central office (CO) under the in-service state of FTTH-PON. Moreover, the downstream traffic performance has also been measured and discussed in PON architecture.

关键词： Protection Optical fiber networks Passive optical networks Access control Optical network units Remote monitoring Optical fiber subscriber loops Central office Condition monitoring Optical switches

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Restoration scheme issues in fiber to the home Ethernet passive optical network (FTTH-EPON)

Restoration scheme issues in fiber to the home Ethernet pass...

引用

IEEE Conference on Innovative Technologies in Intelligent systems and Industrial Applications (CITISIA)

作者： Siti Asma Che Aziz Mohammad Syuhaimi Ab-Rahman Kasmiran Jumari Spectrum Technology Division Computer and Network Security Research Group Department of Electrical Electronics and Systems Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

The smart and intelligent system of FTTH is expected to be a key element which provides centralized monitoring, survivability and instantly maintenance of FTTH customer access network. A challenging task for network planners is to reduce network protection costs while maintaining an acceptable level of survivability. In this paper, we implement a cost effective restoration scheme for a novel tree-based EPON architecture for intermediate split structure (ISS) in the drop region section. The protection mechanism for tree based optical switch will have capability to divert the signal onto protection line according to the types of failure condition and location of failures in access network. This will ensure the data flow continuously due to breakdown occur in the network and instantly repair operation before it cause any major problem later. We employ the dedicated and shared protection in our design. Four faulty conditions are considered in this article and OptiSystem, Inc. software is used to prove the solution feasibility.

关键词： Optical fiber networks Protection Optical fiber subscriber loops Costs Intelligent systems Intelligent networks Monitoring Signal restoration EPON Optical switches

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Web services for monitoring system in optical communication

Web services for monitoring system in optical communication

引用

International Conference on Space Science and Communication (IconSpace)

作者： Aswir Premadi Ng Boon Chuan Mohammad Syuhaimi Ab-Rahman Mohamad Najib Mohamad Saupe Kasmiran Jumari Spectrum Technology Division Computer and Network Security Research Group Department of Electrical Electronics and Systems Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

This paper proposed an application of microcontroller embedded Ethernet to monitoring system in optical communication. We focus on distributed real-time systems, which stand to benefit most from the use of web services technology. For this propose the PIC microcontroller is used control any optical switch connected to it, and send information to internet. It was successfully identified without affecting communication signal transmission, with the specification available a complete system can be made with 24 man-hours. The system will to improve the service reliability and reduce the maintenance cost.

关键词： Web services Monitoring Optical fiber communication Microcontrollers Ethernet networks Real time systems Optical control Communication system control Optical switches Internet

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