The optical networks based on WDM (Wavelength Division Multiplex) technology can carry enormous amount of data in each fiber link in the network. The networks with the high capacity links have the drawback that a single failure leads to the loss of a large amount of data. So a protection strategic is critical to protect from faults both service providers and end-users. IP networks carry many ty...

In WDM optical networks, design protection algorithms aim to maintain the connectivity between two nodes in the network following a failure by mapping a given virtual topology onto the physical topology so as to minimize the failure propagations in a network. In this article, a genetic algorithm based approach has been proposed for design protection in WDM optical networks. The proposed method ...

In this paper, we focus on issues of routing information exchange in large-scale WDM networks. Specifically, we present two schemes, i.e., direct routing information exchange and routing information broker. We then analyze and compare these schemes based on their scalability, complexity and communication overhead. Finally, on examples of metro alloptical networks interconnected over an all-opti...

In this paper, we address the issue of efficiently allocating wavelengths to communication requests in wavelength division multiplexing (WDM) optical networks. We present a simple greedy algorithm and study its performance on directed binary fiber trees. We prove that our algorithm guarrantees a 5=3-approximationfor wavelengths assignment in binary tree shaped WDM optical networks. We also prov...

WDM (wavelength division multiplexing) appears to be the solution of choice for providing a faster networking infrastructure that can meet the explosive growth of the Internet. It has the scalability problem with increasing the access node numbers in WDM ring architecture, so we further propose the alternatives of hierarchical WDM ring architecture. Since the traditional IP provides the best ef...

Given the significant progress made and the continuing advances expected in the optical networking technology, it becomes attractive to build a future Optical Internet that natively supports bursty IP datagrams. Burst switching WDM optical networks are touted as suitable network architectures for future Optical Internet backbones. However, the lack of optical processing capabilities results in ...

It is known that Wavelength division multiplexing (WDM) technique enables single fiber to carry huge amount of data but optical WDM networks are prone to failures, therefore survivability is a very important requirement in the design of optical networks. In this paper, a comprehensive review about survivability of WDM networks has been discussed focusing on scalable and efficient p-cycles resil...

Routing and wavelength assignment (RWA) is a central issue to increase efficiency and reduce cost in Wavelength Division Multiplexing (WDM) optical networks. In this paper, we propose an improved scheme of wavelength assignment of parallel FFT communication pattern on a class of regular optical networks. With our new scheme, the numbers of wavelengths required to realize parallel FFT communicat...

Careful wavelength assignment (WA) to support lambda services is necessary to reduce the total number of wavelength converters (WCs), which are required every time the wavelength continuity constraint cannot be met in wavelength division multiplexing (WDM) networks. With the successful introduction of reconfigurable optical add-drop multiplexers (ROADMs) and related technologies, WDM networks a...

With the widespread deployment of IP over WDM networks, it becomes necessary to develop dynamic lightpath and topology reconfiguration mechanisms and reconfiguration triggers that can effectively exploit WDM reconfigurability. A reconfiguration model for overlay IP/WDM networks is introduced. An IP over WDM network testbed has been set up using Telcordia MONET WADMs and IP routers. The testbed ...