文章基本信息

标题：A NOVEL PROTECTION GUARANTEED, QoT AWARE RWA ALGORITHM FOR ALL OPTICAL NETWORKS
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作者：K .RAMESH KUMAR ; R.S.D.WAHIDA BANU
期刊名称：Journal of Theoretical and Applied Information Technology
印刷版ISSN：1992-8645
电子版ISSN：1817-3195
出版年度：2014
卷号：65
期号：2
出版社：Journal of Theoretical and Applied
摘要：All optical transparent networks carry huge traffic and any link failure or failure to restore the link failed lightpath can cause loss of gigabits of data; hence guaranteed protection becomes necessary at the time of failure. Many protection schemes were presented in the literature, but none of them speaks about protection guarantee. Also, in all optical networks, due to non availability of regeneration capabilities, the physical layer impairments due to optical fibers and components accumulates along the lightpaths (LP) which causes sharp degradation of the Quality of Transmission (QoT), as measured by signal bit error rates (BER) , which is a dominating factor for blocking probability(BP) of transparent optical networks. The problem of protection with QoT issues was rarely studied in the literature. In this work, a novel protection backup path guaranteed, QoT aware Routing and Wavelength Assignment (RWA) Algorithm called �Virtual Lit �Exhaustive Highest Q factor� (V-Lit EHQ) is presented which exhibits desirable qualities for reliable network operation. The proposed scheme possesses the merits and excludes the demerits of Lit and Dark protection schemes. The results of the proposed work are compared with the standard QoT aware versions of the Shortest Path-First Fit schemes for both lit and dark protection. The BP, Vulnerability ratio (VR), and BER, are taken as the performance metrics and the proposed algorithm found to be outperforming in all metrics as shown through simulations.
关键词：Routing and Wavelength Assignment; Path Protection; QoT; Physical layer impairments; Blocking probability