Nabil Naas

University of Tripoli | UOT · Department of Electrical and Electronics Engineering

Software-defined networking (SDN) will be the key enabler of the coming 5G infrastructure. For service providers, extending the SDN concept from packet switching in Layers 2 and 3 to circuit switching in transport layers is a promising approach to meet the growing high burstiness and high bandwidth requirements. A multi-layer, multi-domain controll...

Extending the notion of Software Defined Network (SDN) from packet switching in Layers 2 and 3 to circuit switching in transport layer for service providers is a promising scenario to meet the high burstiness and high bandwidth requirements. For service providers to have a multilayer, multi-domain controller, which can provide automated controller...

Dense Wavelength Division Multiplexing (DWDM) transport networks based on fixed spectrum grids with Single Line Rate (SLR) wavelengths have difficulty managing the exponential growth and heterogeneity of data traffic, and the rapidly expanding Data Center Interconnect (DCI) market. Alternatively, higher scalability can be achieved by adopting Mixed...

Energy consumption of the optical core is expected to contribute to a significant portion of the energy consumed by the telecommunication networks. As an enhanced bandwidth utilization and management extent of the optical Wavelength Division Multiplexing (WDM) technology, multi-granular switching concept has been shown to guarantee energy savings w...

Energy consumption of the optical backbone is expected to contribute to a significant portion of the energy consumed by the telecommunication networks. As an enhanced bandwidth utilization and management extent of the optical Wavelength Division Multiplexing (WDM) technology, multi-granular switching concept has been shown to guarantee energy savin...

Bandwidth utilization and management advancements of Multi-Granular Optical Transport Networks (MG-OTN) have been shown to couple with power savings through lowered port counts. In this paper, we propose energy-efficient design of MG-OTNs by adopting multiple power levels at the MG nodes. Our proposed scheme combines the advantages of a previously...

Multi-Granular Optical Networks (MG-ONs) offer enhanced bandwidth utilization, reduced transmission cost and increased scalability in the optical Internet backbone. There have been several proposals for optimized design of MG-ONs as power consumption in the Internet backbone has recently become an important concern. Although recent research has sho...

Fiber-Wireless (FiWi) access networks aim at combining the flexibility, ubiquity and mobility of wireless access networks with the robustness and high capacity support of the optical access networks. Several bandwidth allocation algorithms have been proposed for the convergence of fiber and wireless access networks. Besides, fiber-wireless converge...

Energy consumption of the core networks is expected to contribute to a significant portion of the energy consumed by the telecommunication networks. Besides their high capacity and reliability advantages, optical networks have also emerged as promising technologies to ensure energy-efficiency in the core Internet. As an enhanced bandwidth utilizati...

Significant portion of the energy consumption of the optical networks is expected to be in the transport segment. Besides its improved bandwidth utilization advantage, multi-granular switching concept further helps rectifying the energy bottleneck problem in the backbone. One of the important challenges faced by the multi-granular optical networks...

Multi-Granular (MG) switching concept has emerged as a strong candidate to alleviate the scalability problems of the conventional optical switching that will result from the expected exponential traffic growth in the optical transport networks. On the other hand, this tremendous increase in the bandwidth demands will also introduce the energy bottl...

In this paper, we present a simple circuit for Manchester decoding and without using any complicated or programmable devices. This circuit can decode 90kbps of transmitted encoded data; however, greater than this transmission rate can be decoded if high speed devices were used. We also present a new method for extracting the embedded clock from Man...

The multi-granular switching concept defined in Generalized Multiprotocol Label Switching (GMPLS) is expected to be a future-proof solution for mitigating the Optical Crossconnet scalability problems associated with the skyrocketing growth of traffic in optical transport networks. In this paper, we address the problem of planning the GMPLS-based (o...

This paper explores the benefits of incorporating the demand-bifurcation feature into the design and planning process of the multi-granular optical network under the fiber-scarce situation. Our simulation results demonstrate that the bifurcation of demands at all traffic granularity levels can only be beneficial provided that the traffic pattern is...

The multi-granular optical transport network is expected to be the ¿future-proof¿ solution for mitigating the Optical Crossconnect (OXC)/Reconfigurable Optical Add and Drop Multiplexers (ROADM) scalability problems associated with the continuing growth of traffic in optical transport networks. Although the multi-granular optical network promises...

With the ever-increasing traffic in WDM transport networks, the development of GMPLS (or multi-granular) transport networks becomes essential to avoid the cost explosion of OXCs. Much work has been devoted to the development of Multi-Granular Optical Crossconnect (MG-OXC) architectures and network design and planning methods. Extending these effort...

GMPLS (or multi-granular) optical transport networks are expected to be the “future-proof” solution for mitigating the OXC/ROADM scalability problems associated with the continuing growth of traffic in optical transport networks. Although GMPLS optical networks promise exciting opportunities, they also present new design challenges that have been t...

One of the most debatable issues in the field of optical networks is wavelength conversion. With the introduction of the multi-granular switching concept, the debate can be extended to consider the significance of performing label conversion for all optical flows defined in Generalized Multiprotocol Label Switching (GMPLS). In order to conduct this...

The ever increase in the Internet traffic resulted in an increase in the number of wavelengths per fibre in WDM networks. Consequently, the required number of optical ports increases which accordingly increases the cost of the optical cross connect and the complexity of the routing and wavelength assignment algorithms. As a result, the multi-granul...

The continuing rapid increase in the number of wavelengths per fiber will dramatically increase the size of OXCs/ROADMs in the WDM-based metro core networks. This calls for the use of the multi-granular switching concept introduced in GMPLS to avoid the cost explosion of these optical switches. This paper addresses the optimal planning problem of t...

One of the most debatable topics in the field of optical networks is wavelength conversion. This is because the usefulness of wavelength conversion depends on (1) the routing and wavelength assignment algorithm used to set up lightpaths and decide both the best locations and number of wavelength conversions, and (2) the convertible crossconnect arc...

With the advances in the optical signal processing, extending the optical reach beyond thousands of kilometers becomes a reality, but the debatable question remains: how far the optical reach needs to be extended in order to achieve a minimal transport network cost. In this paper, we investigate the issue of determining the best optical reach in th...

With the ever-increasing traffic in WDM transport networks, the development of GMPLS (or multi-granular) transport networks becomes essential to avoid the cost explosion of OXCs. This paper addresses the optimal planning problem of the GMPLS transport network by (1) considering the whole flow hierarchy defined in GMPLS, (2) allowing the optical sig...

With the explosive traffic growth of WDM-based transport networks, the development of GMPLS (or multi- granularity)-based transport networks becomes essential to cope with the network scalability problems. This paper defines a novel problem of planning realistic GMPLS-based transport networks by (1) considering the whole traffic hierarchy defined i...

With the explosive traffic growth of WDM-based transport networks, the development of GMPLS (or multi-granularity)-based transport networks becomes essential to cope with the network scalability problems. Much work has been devoted to the development of Multi-Granular Crossconnect (MG-XC) architectures and planning (or dimensioning) methods. Extend...

With the explosive traffic growth of WDM-based transport networks, the development of GMPLS-based transport networks becomes essential to cope with the network scalability problems. This paper defines a novel realistic problem of planning GMPLS transport networks by (1) considering the whole traffic hierarchy defined in GMPLS; (2) allowing optical...

With the multi-granularity switching capability taken into consideration in WDM-based transport networks, most existing routing and wavelength assignment (RWA) planning algorithms become economically infeasible. Therefore, efficient implementation of the whole traffic hierarchy defined in generalized multi-protocol label switching (GMPLS) has to be...

With the ever-increasing traffic in WDM-based transport networks, the development of GMPLS (or multi-granular)-based transport networks becomes essential to avoid the cost explosion of OXCs and ROADMs. This paper addresses the optimal planning problem of the GMPLS-based transport network by (1) considering the whole traffic hierarchy defined in GMP...

The rapid increase in the number of wavelengths per fiber has significantly increased the size of Optical Crossconnects (OXCs) in WDM transport networks. This calls for the use of Multi-Granular OXCs (MG-OXCs) to maintain the scalability of OXCs at a reasonable level. Various MG-OXC architectures and methods for the planning (or dimensioning) of MG...

The rapid increase in the number of wavelengths per fiber has significantly increased the size of the optical crossconnect (OXC) in WDM transport networks. To maintain the scalability of the OXC at a reasonable level, various multi-granular OXC (MG-OXC) architectures have been proposed. Motivated by the fact that the MG-OXC constitutes only the opt...

The exponentially growing traffic demands in wide area networks (WANs) can be satisfied by exploiting the huge capacity available in fiber using wavelength division multiplexing (WDM) technique. Given the fact that WDM components are still expensive, it is important to concentrate on optimizing the cost of the WDM-segment to be added to the existin...

Thesis (M. Sc.)--Queen's University, 1999. Includes bibliographical references.