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Ashraf Q.M.,International Islamic University Malaysia | Ashraf Q.M.,Telekom Malaysia Research and Development | Habaebi M.H.,International Islamic University Malaysia | Islam M.R.,International Islamic University Malaysia | Khan S.,International Islamic University Malaysia
2016 International Conference on Intelligent Systems Engineering, ICISE 2016 | Year: 2016

The term Internet of Things (IoT) refers to the expansion of Internet technologies to include smart objects by extensive deployment of exclusively identifiable distributed communication devices. The management of configuration in these devices, in particular, is a challenge due to the high heterogeneity in different communication protocols, communication sequences, and processing capabilities. We propose a device configuration management scheme for IoT inspired by IBM's autonomic control loop. This scheme is capable of discovering sensors despite their heterogeneity in their offered services. Furthermore, by enabling configuration management, dependence of IoT systems on user interference can be minimized. © 2016 IEEE.

Alias M.S.,Telekom Malaysia Research and Development | Shaari S.,National University of Malaysia
Journal of Lightwave Technology | Year: 2010

A new technique for analyzing the loss of high order modes in photonic crystal VCSEL is reported. The technique proposed is a semi-empirical approach that uses comparison to experimental data. For that purpose, photonic crystal VCSEL devices of single mode and multi mode are fabricated and measured for device characteristics comparison. The fabricated devices are modeled using finite difference frequency domain technique for the purpose of investigating the photonic crystal guided modes and loss analysis. In order to verify the findings, full three dimensional analyses are performed based on the fabricated single mode and multi mode devices structures using common finite difference time domain technique. The results show close agreement between the computed and experiment findings, justifying the used of the proposed semi-empirical technique for analyzing the loss of high order modes in photonic crystal VCSEL. Results for guided modes and near- and far-field are also presented for the photonic crystal VCSEL. © 2010 IEEE.

Al-Omari A.N.,Yarmouk University | Alias M.S.,Telekom Malaysia Research and Development | Ababneh A.,Yarmouk University | Lear K.L.,Colorado State University
Journal of Physics D: Applied Physics | Year: 2012

Top-emitting, oxide-confined, copper-plated 980 nm vertical-cavity surface-emitting lasers (VCSELs) with improved performance were fabricated and characterized. Annular copper-plated heat sinks reduced the device's thermal resistance and increased the output optical power and the bias current density at which the output optical power saturates. Increasing the plated heat sink radii from 0 to 8 μm greater than the mesa diameter for VCSELs with 26 μm mesa diameter and 8 μm active area diameter reduced the measured thermal resistance by 65% and increased the bias current density at which the output optical power saturates by 62%, which increased the maximum output optical power achieved by 162%. VCSELs with active area diameter and heat sink overlap of 8 μm demonstrated ∼64% decrease in active region temperature at the maximum output optical power compared with devices with no heat sink overlap. A 29% improvement in the devices' modulation bandwidth was calculated due to reduced temperature and increased power. Devices with identical mesa diameters of 26 μm and different heat sink overlaps exhibited a threshold current density and a total series resistance of (1.25 ± 4%) kA cm-2 and ∼95 ω, respectively. Simple VCSEL L-I and thermal models were used to simulate the VCSEL's L-I performance at elevated ambient temperatures. Good agreement between measured and simulated characteristics was obtained. Detailed protocols for critical fabrication steps are presented. © 2012 IOP Publishing Ltd.

Fikry A.,University Technology of MARA | Hussein Z.,University Technology of MARA | Yusob R.,Telekom Malaysia Research and Development
BEIAC 2013 - 2013 IEEE Business Engineering and Industrial Applications Colloquium | Year: 2013

This study aims to diagnose the significant differences between the Malaysian demographic profile and intention to adopt healthcare services in digital home. By using two stage experiment involving 105 respondents who resides in Malacca, Kuala Lumpur and Selangor has been selected for this study, 105 questionnaires were distributed to respondents before and after the exposure to healthcare services materials (slides, bunting and pamphlet). The results of the study revealed that there is a significant difference between educational level and intention to adopt healthcare services in digital home. Thus, it is suggested that educational level should be given some consideration in future research efforts. The research and practical implications of these results are discussed and opportunities for future research are provided. © 2013 IEEE.

Alias M.S.,Telekom Malaysia Research and Development | Shaari S.,National University of Malaysia | Choudhury P.K.,Multimedia University
Optik | Year: 2010

High-performance oxide vertical-cavity surface-emitting (VCSEL) laser is fabricated, and its usefulness is demonstrated as a suitable transmitting light source at 850 nm operating wavelength for Gigabit Ethernet application. Utilization of barrier reduction layers reveals low-threshold current requirement for operation at high modulation bandwidth. The electrical and optical characteristics, measured from the fabricated VCSEL, are simulated for Gigabit Ethernet transmission. Data rates of 1.25 Gbps with a bit error rate of 10-11 are achieved by the use of a specific multimode network simulator. © 2008 Elsevier GmbH. All rights reserved.

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