Survivability in Optical Networks: A Solution for the Wavelength Continuity Constraint Case

Abstract

Survivability of internet services is a significant and crucial challenge in designing future optical networks. A robust infrastructure and transmission protocols are needed to handle such a situation so that the network users can maintain communication despite the existence of one or more failed components on the network. For this reason, in this work, we present a generalized approach to tolerate any set of failure scenarios, to the extent the user can still communicate with the remaining components, where a scenario corresponds to an arbitrary set of links in a non-operational state. To assess the survivability problem, we propose a joint solution to the problems listed next. We show how to find: a set of primary routes, a set of alternate routes associated to each failure scenario, and the capacity required on the network to allow communication between all users, in spite of any failure scenario, while satisfying for each user a specific predefined quality of service threshold, defined in the Service Level Agreement (SLA). Numerical results show that the proposed approach not only enjoys the advantages of low complexity and ease of implementation but is also able to achieve significant resource savings compared to existing methods. The savings are higher than 30% on single link failures and more than a 100% on two simultaneous link failures scenarios and in more complex failure scenarios.

Estimating the Survivability Impact of Multi-Fiber Wavelength-Division Multiplexing Networks

“…Several research studies have been done on WDM in OFNC that address the restoration and protection schemes of survivability [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. These studies employ different methodologies which are based on various factors that affect the OFNC.…”

“… Jara, N., (2019) -The study iterated that survivability is the main factor of data restoration and protection during the network failure. The paper focuses on mesh connection of network topology [8]. Here the different availability requirements and protection of current state are based on different time contexts.…”

“…According to NSFNet, there is one fiber cut in 5 days in a 26000 km large optical fiber network, [3][4][5][6]. Further, the possibility of two instantaneous failures in optical network is even higher; approximately 0.0027 with respect to the time of 24 hours per year [7][8][9][10]. The survivability of WDM means the ability of the network to secure and protect the information during the processing through OFNC.…”

“…These reasons for the failure have been taken into consideration for the intended research work on gauging the impact of survivability in WDM. Justifying the needs of factors of survivability and its' impact are important for establishing the durability and the commercial viability of the optical fiber network [8]. The quantitative evaluations of the survivability factor will also ensure the protection and restoration technique of optical network in spite of the occurrence of failures in infrastructure of optical fiber network.…”

“…The quantitative evaluations of the survivability factor will also ensure the protection and restoration technique of optical network in spite of the occurrence of failures in infrastructure of optical fiber network. There is a tradeoff between survivability and the cost of the optical network [5][6][7][8], and 100% survivability can be achieved by enthusiastic path protection. More specifically, in the present study, we have determined the survivability impact of alternatives with the help of different factors by using an integrated methodology of FAHP and FTOPSIS.…”