New multicast switch-based multicast wavelength allocation algorithm to increase network capacity

Abstract

Abstract__ Dynamic wavelength allocation (DWA) in multicast (MC) switching is investigated in this paper. The aim for this investigation is to maximize the network capacity and minimize the blocking probability in the wavelength division multiplexer network (WDM). By using light splitters (LS) and wavelength converters (WC) in the joint nodes, the WDM network is improved and the wavelength reuse was increased. The result shows that our optimization has increased the network capacity by about 41% compared with previous work. Keywords__ Multicast (MC), network capacity, dynamic wavelength allocation (DWA), wavelengthdivision multiplexing (WDM), light splitting (LS), and wavelength conversion (WC) I.INTRODUCTION Wavelength division multiplexing (WDM) has made a really revolution in the optical fiber networks by supporting a high number of channels (wavelengths) in the optical fibers. The results in [1] show that it should be possible to transmit more than 1000 of 2.5-Gb/s WDM channels spaced at 5 GHz over 480 km of SMF without any dispersion compensation scheme. Whereas in [2] in the backbone networks, capacities greater than 1 Tb/s over a single fiber have been achieved by means of wavelength divisionmultiplexing (WDM) technology with hundreds of channels. That means the optical fiber using WDM can be the best solution for the high demand for the high data rate and the high values of bandwidth. By using WDM in a network can also increase the network capacity and decreasing the network blocking probability. The dynamic wavelength allocation (DWA) is one of the best solutions to the high data rate and high bandwidth which the wavelength division multiplexer (WDM) can provide. There are different (DWA) scenarios according to the assignment schemes (centralized and distributed). In the centralized DWA there is a single

A New Centralized Multicast Wavelength Allocation Algorithm in Optical Fiber Network

“…The algorithm will be analyzed later on this paper, but the network capacity is described and calculated in this step. In the network in figure (1), there are availability for the calls {(1,2), (2,3), (2,4), (1,3) and (1,4)}. There are five calls for each wavelength available in are assumed, the number of calls available in this network will be ten.…”

“…The algorithm will be network capacity is described and calculated in this step. re availability for the calls {(1,2), (2,3), (2,4), (1,3) and (1,4)}. There are five in this network as downstream calls.…”

“…requested to destination (4). If (E1) is assigned for the call {1, 4}, the network capacity decreasing 2), (2,4) and (1, 4)}, and result is (3) call availabilities are blocked, as shown in fig (1). Whereas, if (E assigned for the call {1, 4}, network capacity decreasing will be {(1, 2), (2, 4), (1,4) and (1, 3)}, and result is (4) calls will be blocked.…”

“…The explanation has been made by using mathematic analyzing. There is also a mathematic calculation of the number of links and paths, and how they are blocke many sub trees, T= (S1, S2, S3, S4.....Sn), where defined in equation (2). Where (L is the links in the network and P is number of paths.…”

“…The wavelength conversion (WC) technologies are used in the WDM network with different schemes. The wavelength conversion (WC) technologies are sorted by the conversion degree (d) as has been analyzed by [2]. The dynamic wavelength assignment (DWA) has been implemented in different algorithms, in which it has different schemes and computations.…”