Impact of wavelength converters in wavelength routed all-optical networks
Computer Communications
Converter placement in all-optical networks using genetic algorithms
Computer Communications
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Wavelength Division Multiplexing (WDM) wavelength routed all-optical WAN's have emerged as the most efficient means to meet the ever increasing integrated demands of the communication applications. They have potential to meet the exponential growth in the user traffic catering to the needs of divergent requirements such as high bandwidth online medical applications, real-time rocket and satellite communications, secure transaction processing in federated databases, defense applications, multimedia traffic, supercomputer interconnects along with smaller bandwidth requirements of voice, data and many other applications to millions of users. The inability of the end users to generate data more than a few gigahertz ( electronic bottleneck) and the large bandwidth of the fiber has led to the development of WDM technology. The optical transmission bandwidth is split into a number of distinct non-interfering and non-overlapping wavelength communication channels each operating on a different optical wavelength and at different bit rates (peak electronic rate of a few Gb/s). The co-existence of a number of channels on a single fiber increases the utilization of the fiber bandwidth throwing challenges to design and development of suitable network architectures, protocols and algorithms.This paper attempts to study the impact of wavelength converters in WDM wavelength routed all-optical networks. A new heuristic approach for placement of wavelength converters to reduce blocking probabilities is explored. Multihop virtual topology is designed to minimize the number and overall cost of the converters. Blocking probabilities for Static lightpath establishment(SLE) and Dynamic lightpath establishment(DLE) are analyzed. In the case of SLE, arranging lightpaths in ascending order of their path length reduces blocking probability. Wavelength converters placed at nodes with high nodal degree further reduces the blocking probabilities. Simulation studies performed on 28-node USA long haul network and 20-node arbitrary mesh network, validate the above observations. Section two describes the network model, while a review of related works is discussed in section three. Section four addresses the SLE and DLE in a wavelength convertible network. An analytical model for minimum wavelength conversion cost is given in section five. Section six gives the algorithm for SLE and DLE respectively. Simulation and numerical results are presented in the section seven.