

Articles
by
F.M. Abbou 
Total Records (
6 ) for
F.M. Abbou 





Tan Saw Chin
,
F.M. Abbou
and
Ewe Hong Tat


The impact of FourWaveMixing (FWM) is investigated using the proposed Assign Shortest Path First (ASPF) algorithm for wavelength assignment in Routing and Wavelength Assignment (RWA). Results show that ASPF algorithm indulges more FWM crosstalk in high optical channels for all input light power and low input power able to reduce he effect of FWM. The blocking probability due to FWM effects is approaching idea case when input power is less than or equal to 10 mW. Furthermore when the input light power is 15 mW, the blocking due to FWM crosstalk is extremely high. Thus, careful optical channel capacity, low FWM crosstalk, low input light power and a FWMaware wavelength assignment algorithm are strongly desired for the accomplishment of efficient and high capacity WDM transparent optical network. 





S.C. Tan
,
F.M. Abbou
and
H.T. Ewe


The impact of FourWave Mixing (FWM) is investigated
using the proposed Assign Shortest Path First (ASPF) algorithm for wavelength
assignment in Routing and Wavelength Assignment (RWA) in two different
topologies. The results show that the ASPF algorithm indulges more FWM
crosstalk in a 8 node Ring topology compared with a 8 node Mesh topology
for optical channels of 16 and 32. Careful optical channel capacity, low
FWM crosstalk power in different network topology are strongly desired
for the accomplishment of efficient, costeffective, high capacity WDM
transparent optical network. 




S.C. Tan
,
F.M. Abbou
,
H.T. Ewe
and
Y.P. Singh


In this study, a new linear formulation for wavelength assignment is presented. The proposed a heuristicbased algorithm
allows to solve wavelength assignment problem in optical network with less computational effort compared with Integer Linear
Programming (ILP) approaches with large size of network. It is found that the proposed heuristic can yield to stable, efficient and reliable results with increasing traffic demands. 




Yasin M. Karfaa
,
M. Ismail
,
F.M. Abbou
,
S. Shaari
and
S.P. Majumder


A semi analytical analysis is carried out to investigate the effect of linear crosstalk due to wavelength converters and other Wavelength Division Multiplexing (WDM) components in the presence of interferometric intensity noise and amplified spontaneous emission on the performance of an optical multiwavelength transport network employing wavelength converters based on XPM in a Single Mode Fiber (SMF) and MachZehnder Interferometer (MZI), where a new parameter names Relative Output Noise (RON) is identified and accounted for. Theoretical study is done for the Bit Error Rate (BER) performance analysis due to crosstalk and ASE noise. It is found that linear crosstalk induces higher penalty when the number of transmitted channels is increased in the presence of all the above effects. The conditions for conversion at 10 Gbps or more are identified. The initial results for monolithic integrated interferometric wavelength converters are reviewed by transmission of 10 Gb/s converted signals over nondispersion shifted single mode fiber. 




A. Abid
,
F.M. Abbou
and
H.T. Ewe


Optical Bursts Switching (OBS) is a flexible yet efficient photonic switching paradigm. However, due to their oneway resource reservation mechanism, OBS networks experience high bursts (thus packets) loss rate. In OBS networks, the contention is resolved either by dropping one of the contending bursts, or more efficiently by dropping from one of the contending bursts only the parts that overlap with the other burst. In both situations, only one data source will suffer the data loss in favor to the other. In this study a simple yet effective network resource allocation algorithm is presented. With this algorithm, the dropped segments are selected evenly from both contending data bursts. Furthermore, the truncated data bursts (forwarded or deflected) are guaranteed to be larger than the minimum burstlength allowed by the network specification. Additionally, the algorithm is demonstrated to be practical if used in a mechanism to provide differentiated services to IP packets over an OBS network. A simulation is used to evaluate the performance of the algorithm. 




S.C. Tan
,
F.M. Abbou
and
H.T. Ewe


An Antbased algorithm is proposed for Four Wave Mixing (FWM)Aware Wavelength Assignment with the objective to optimize light path connection according to the wavelength clash and wavelength continuity constraints while guaranteeing acceptable signal quality according to FWM crosstalk. Performance results show that the proposed antbased algorithm outperforms the Assign Shortest Path First (ASPF) algorithm. It is found that in the case of Ant algorithm, the induced blocking probability is lower compared to ASPF algorithm in the presence of FWM. 





