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Mohammad Nasir Uddin 

American International University-Bangladesh
nasiruddin@aiub.edu
Mohammad Nasir Uddin received B.Sc. degree in Electrical and Electronic Engineering from Khulna University of Engineering and Technology, KUET in 2003 and M.Sc Engineering in Computer Networks from Middlesex University, United Kingdom (UK) in 2006. He started his teaching career as a Lecturer of Computer Science & Engineering Department of University of Development Alternative (UODA), Dhanmondi Dhaka, Bangladesh on February 2004. On September 2006, he joined Deptartment of Computing, The Business School of London, United Kingdom (UK) as a Lecturer. He was appointed as a Lecturer of Electrical and Electronic Engineering Department , Faculty of Engineering, American International University-Bangladesh (AIUB) on January 2009. His present research interest includes Wireless Mobile Communication, Fiber optic communication and DWDM system.

Books

2010
Mohammad Nasir Uddin (2010)  THE ANALYSIS OF MOBILE ACCESS METHODS   Web link to order hard copy https://www.morebooks.de/store/gb/book/the-analysis-of-mobile-access-methods/isbn/978-3-8433-6976-3: LAP - LAMBERT Academic Publishing, Germany. First Edition isbn:978-3-8433-6976-3  
Abstract: This book will discuss the functionality of each access method (FDMA, TDMA and CDMA), the advantages, disadvantages, efficiency, implementation issues of each technology, and various forms of implementation for each technology. FDMA and TDMA are currently being used to support conventional and trunked radio systems, as well as commercial cellular systems. CDMA is being used primarily in cellular systems at this time. Access methods selection criterion is discussed to explain what should be considered to choose an appropriate access method. Some easy to understand tables are given to provide the reader a general overview of how each technology differs. Next, a comparison is made between the technologies followed by a discussion of the primary benefits each technology offers to mobile networks. Finally, the report presents a case study on San Francisco Bay area mobile networks. You must read this book if you are a telecom engineer, manager, or developer who wants to survive professionally in a converged world and for those who wants to know how different access method works, their advantages, suitability and implementation issues.
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Journal articles

2010
Mohammad Nasir Uddin, Ashim Kumar Saha (2010)  Transmission Performance Analysis of Long-Haul WDM Network Employing Single Mode Fiber, Dispersion Compensating Fiber and Erbium Doped Fiber Amplifier   AIUB Journal of Science and Engineering (AJSE) Vol 9: No. 2. August  
Abstract: The performance of Erbium Doped Fiber Amplifier (EDFA), Single Mode Fiber (SMF) and Dispersion Compensating Fiber (DCF) in a dynamic and reconfigurable Wavelength Division Multiplexing (WDM) system has been demonstrated in this simulation study. Eight WDM channels, each channel running at 40 Gbps, are transmitted through SMF, DCF and EDFAs. The effect of long distance transmission of optical signals to the value of OSNR, Q factor and bit error rate (BER) performance in the WDM optical network, keeping the Bit Error Rate (BER) or eye pattern in acceptable range has been observed. The WDM system trial using EDFAâs, SMF and DCF shows acceptable but deteriorated eye patterns and bit error penalties upto 420 km of transmission distance. Output power of the system was kept almost constant (-12 dBm) for the whole simulation process. Our simulation model can inhibit dispersion to a minimum possible limit due to the application of DCF (dispersion value is -85 ps/nm/km) along with the single mode fiber (dispersion value is 17 ps/nm/km). Gain flatness is also maintained by keeping the value of input power and output power equal while performance of the network is analyzed.
Notes: [1] S. Novak, and A. Moesle, âAnalytic Model for Gain Modulation in EDFAsâ Journal of Lightwave Technology, Vol. 20, Issue 6, pp. 975 â 985, June 2002. [2] M. E. Marhic, N. Kagi, T. K. Chiang and L.G. Kazovsky, âBroadband fiber optical parametric amplifiersâ OSA Optics Letters, Vol. 21, No 8, pp. 573 - 575, April 1996. [3] B. Altiner, N.O. Unverdi, "Modelling - Simulation and gain flattening improvements for an Erbium Doped Fiber Amplifier," Optomechatronic Technologies, 2009. ISOT 2009. International Symposium on, pp. 451-454, 21-23 September 2009. [4] E. Tangdiongga, J. J. J. Crijns, L. H. Spiekman, G. N. van den Hoven, and H. de Waardt, âPerformance Analysis of Linear Optical Amplifiers in Dynamic WDM Systemsâ IEEE Photonics Technology Letters, Vol. 14, No. 8, pp. 1196-1198, August 2002. [5] S. H. Yun, B. W. Lee, H. K. Kim and B. Y. Kim, âDynamic Erbium - Doped Fiber Amplifier Based on Active Gain Flattening with Fiber Acoustooptic Tunable Filtersâ IEEE Photonics Technology Letters, Vol. 11, No. 10, pp. 1229-1231, October 1999. [6] G. Yan, Z. Ruixia, D. Weifeng and C. Xiaorong, âPoint-to-Point DWDM system design and simulationâ Proceeding of the 2009 international symposium on information processing (ISIPâ09). Huangshan, P.R. China, pp. 090 â 092, August 2009. [7] C. M. Weinert, R. Ludvig, W. Papier, H.G. Weber, D. Breuer, K. Petermann, and F. Kuppers â40 Gbit/s Comparison and 4 X 40 Gbit/s TDM/WDM Standard Fiber Transmissionâ, Journal of Lightwave Technology, Vol. 17, No. 11, pp. 2276 - 2284, November 1999.
2009
Mohammad Nasir Uddin, Ashim Kumar Saha (2009)  Comparison of the Optical Signal-to-Noise Ratio (SNR) of WDM EDFA Chains for Different Light Sources   AIUB Journal of Science and Engineering (AJSE) Vol 8: No. 1. 77-81 August  
Abstract: A simplified analytical model for the calculation of the Signal-to-Noise Ratio (SNR) in Multi Wavelength Erbium-Doped Fiber Amplifier (EDFA) cascades is used to observe the effect of different wave lengthâs light sources on SNR. In this work, the wavelengths chosen for the analysis is 1330 nm and 1550 nm. It has been found that the SNR for 1550 nm is higher than 1330 nm wavelength. The effect of changing the amplifier spacing on SNR has been observed for fixed transmission length with different Gain-Loss differences (ï(i)) and for different transmission lengths. For a 3000 km long transmission line with gain-loss difference ï(i) = -0.15 dB, maximum SNR of 20.45 dB for 1550 nm wavelength and 19.8 dB for 1330 nm wavelength light sources has been found. These maximum SNRs occur for the amplifier spacing of 44.8 km. Maximum amplifier spacing to obtain a fixed SNR (15 dB) for different ï(i) and variable transmission lengths has also been observed for 1330 nm 1550 nm.
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