Design of Energy Efficient Survivable Multipath Routing and Spectrum Allocation in offline Elastic Optical Network

Abstract

A tremendous surge in usage of high bandwidth applications evolved out due to huge newlineinternet access by the exponential growth of the number of users has motivated our concern newlineto address scalability by using the optical network. Thanks to OFDM technology, the newlineconnection requests having variable traffic demand can be allocated on the fiber links by newlineusing contiguous sub-carriers or FSs of different sizes subcarrier is of 12.5 GHz bandwidth. newlineUsing flexible channel allocation, OFDM based elastic optical network (EON) increases the newlinescalability of the network. The objective of RSA in EON for a connection request (to be newlineestablished in the network with some traffic demand) is to allocate the requisite traffic in newlineterms of a set of FSs over all the fiber links of the path, in such a way that the highest utilized newlinespectrum over all the links of the EON gets minimized. When an optical signal traverses newlinebeyond the maximum optical reach, the optical signal may experience BER in it at the newlinedestination node due to some which degrade the QoT of the optical signal. Regeneration as newlinewell as O-E-O conversion of the optical signal is thus required in the intermediate nodes by newlineplacing regenerator(s) at intermediate node(s) in regenerator aware EON. SDM is another newlinevariation of EON with high scaling potential. In SDM-EON, each fiber link consists of newlinethe same number of multiple cores, and traffic associated with an optical signal may be newlinedistributed among the multiple cores, which enhances the capacity of the SDM-EON many newlinefold times compared to that of EON. However, assigning FSs of the same frequencies in newlinethe adjacent cores generates crosstalk which degrades the quality of the optical signal. To newlinemaintain the quality of the optical signal, the amount of crosstalk must be taken into account. newlineWith the recent growth of voluminous data traffic in the network, ensuring survivability in newlineEON/ SDM-EON is the most challenging area of research. Single link failure is the most newlinecommon breakdown scenario that can affect several established connections, le