Rafed Sabbar Abbas
Start date: 01/10/2010
Email:RAFEDSABBAR.ABBAS@BRUNEL.AC.UK
Supervisor: Prof. Hamed Al-Raweshidy
PhD Research: Dynamic wavelength allocation in optical fiber network
To investigate optical tree networks using wavelength division multiplexing (WDM) technology. WDM technology is to transmit number of wavelengths in a single optical fiber. Wavelength assignment is the topology to choose the fitted wavelength to carry information from the source to the destinations. There are different types of wavelength allocation and the work in this research is to investigate dynamic wavelength assignment (DWA).
The centralized and distributed scenarios have been examined in this research using multicast algorithm to multicast information to different destinations. The researcher considers also the wavelength switching using the adequate wavelength converters (WC) and light splitters (LS) to broadcast data.
The wavelength routing and assignment are NP-complete and this problem has to be solved by using routing or assignment algorithm to send data to destinations. The blocking probability, network capacity and time delay is the most challenges in this area of research as shown in fig. 1. Using different algorithms are to solve different problems. The purpose of this work to increase number of calls in an optical network and decrease the cost, blocking probability, group delay, conversion range and wavelength dispersion.
Other achievement is to optimize a wavelength multicast switch to minimize number of converters, conversion range and number of splitters fig. 2.
Publications:
- N. Radhi 1, K. Aziz 2, R. S. Abbas3, H. AL-Raweshidy; , “Cyclostationary Detection in Spectrum Pooling System of Undefined Secondary Users”, ICWMC, The Seventh International Conference on Wireless and Mobile Communications, pp. 266-270, 2011.
- Alfredo Viglienzoni, Hamed Al-Raweshidy, “Next Generation Network: Wireless-Optics Technologies”, White Paper, Net!Works European Technology Platform, 2011, vol. 13, available online [accessed on] 08/December/2011, http://www.networks-etp.eu/fileadmin/user_upload/Publications/Position_White_Papers/White_Paper_RoF.pdf
- Abbas, R.S.; Al-Raweshidy, H.; , "New multicast switch-based multicast wavelength allocation algorithm to increase network capacity," International Conference on Future Communication Networks (ICFCN), 2012, vol., no., pp.164-169, 2-5 April 2012.
- Sabbar Abbas, Rafed; Al-Raweshidy, Hamed Saffa; Radhi, Nazar; Alabdulkreem, Eatedal; , "New multicast switch and algorithm to increase network capacity," International Conference on Telecommunications (ICT), 2012 19th, vol., no., pp.1-6, 23-25 April 2012.
