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Temperature-pattern dependence of initial carrier density of high-speed digitally modulated uncooled semiconductor laser diodes: Theoretical analysis

Temperature-pattern dependence of initial carrier density of...

引用

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

In this paper, the temperature-pattern dependence (T-PD) of initial/residual carrier density, Ni, of high-speed digitally modulated uncooled semiconductor laser diode has been investigated in details. The temperature dependence (TD) of N ii has been calculated according to the TD of threshold carrier density, N th , analytically and not by the well known exponential Pankove. While the pattern dependence (PD) of N i has been calculated according to the effect of the number of ldquo0rdquo bits preceding the considered ldquo1rdquo bit, N bit , and bitrate, Brate, on the carrier density through the time interval between the ldquo1rdquo bits. We show, for the first time, that Ni may increase or decrease, i. e. fluctuate, with temperature of operation, T, depending on the time interval between the previous and the next ldquo1rdquo bits.

关键词： Charge carrier density Digital modulation Diode lasers Optical receivers Optical transmitters Optical modulation Passive optical networks Optical feedback Circuits Superluminescent diodes

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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...

引用

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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Implementation of Access Control System for Fiber to the Home

Implementation of Access Control System for Fiber to the Hom...

引用

International Conference on computer and Automation engineering, ICCAE

作者： Mohammad Syuhaimi Ab-Rahman Aswir Premadi Computer and Network Security Research Group Department of Electrical Electronics & Systems Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

This paper proposes a design and architecture of access control system to implement remote monitor and control for fiber to the home. Our solution works on a standard local area network (LAN) using a specially designed hardware interfaced with an Ethernet system rising PIC microcontroller. The developed design will be installed with optical line terminal (OLT) at the central office (CO). Protection switching is achieved automatically when failure occurs without interrupting customer service.

关键词： Passive optical networks Optical network units High speed optical techniques Microcontrollers Ethernet networks Hardware Design engineering Local area networks Integrated optics Condition monitoring

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FTTH network Management Software Tool: SANTAD ver 2.0

FTTH Network Management Software Tool: SANTAD ver 2.0

引用

International Conference on Signal Acquisition and Processing, ICSAP

作者： Boonchuan Ng Mohammad Syuhaimi Ab-Rahman Kasmiran Jumari 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 focused on developing a fiber-to-the-home (FTTH) network management software tool named Smart Access network Testing, Analyzing and Database (SANTAD) ver 2.0 based on Visual Basic for transmission surveillance and fiber fault identification. SANTAD will be installed with optical line terminal (OLT) at central office (CO) to allow the network service providers and field engineers to detect a fiber fault, locate the failure location, and monitor the network performance downwardly from CO towards customer residential locations. SANTAD is able to display the status of each optical network unit (ONU) connected line on a single computer screen with capability to configure the attenuation and detect the failure simultaneously. The failure information will be delivered to the field engineers for promptly actions, meanwhile the failure line will be diverted to protection line to ensure the traffic flow continuously. The database system enable the history of network scanning process be analyzed and studied by the engineer.

关键词： Optical fiber subscriber loops Software tools Optical fiber testing Optical network units Optical attenuators Optical fiber networks computer displays Software development management Software testing Data analysis

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Lock-on range of infrared heat seeker missile

Lock-on range of infrared heat seeker missile

引用

International Conference on Electrical engineering and Informatics, ICEEI

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

引用

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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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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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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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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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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