NDLI: Pre-configured backup protection with limited resource sharing in elastic optical networks

Content Provider	IEEE Xplore Digital Library
Author	Satkunarajah, S. Ratnam, K. Ragel, R.G.
Copyright Year	2015
Description	Author affiliation: Dept. of Comput. Eng., Univ. of Peradeniya, Peradeniya, Sri Lanka (Satkunarajah, S.; Ratnam, K.; Ragel, R.G.)
Abstract	In this paper, we address the problem of providing survivability in elastic optical networks (EONs). In EONs, unlike the traditional 50 GHz fixed grid, fine granular 12.5 GHz flexgrid is used and the frequency spectrum is used more efficiently. For providing survivability, we consider a recently proposed survivability approach known as pre-configured backup protection with sharing (PBPS) because of its benefits over traditional methods. In PBPS, backup paths can be pre-configured and at the same time they can share resources. Therefore, both short recovery time and efficient resource usage can be achieved. PBPS has earlier been investigated for fixed-grid and flexgrid (EONs) networks using switch architectures with the power splitting feature of variable optical splitters (VOSs) and combiners. A potential problem in PBPS is power loss due to possible repeated power splitting. To reduce the power loss, amplifiers can be used at additional high cost. Alternatively, an approach of limiting backup sharing has been investigated in fixed-grid networks. In this approach the number of power splitting on a backup lightpath at intermediate nodes is limited (to a threshold value) to reduce the total power loss. This approach limits the degree of backup sharing. PBPS with limited backup sharing has not been investigated for flexgrid networks (EONs) and this investigation is the focus of this paper. We carry out this investigation with detailed simulation experiments on different network topologies. Our findings are as follows. (1) As seen in fixed-grid networks, even with the small number of power splitting, significant blocking reduction is seen in EONs. (2) Unlike fixed-grid networks, the blocking performance of PBPS with the small number of power splitting is comparable to the performance associated to unlimited power splitting (unlimited sharing) and, therefore, PBPS with limited sharing is more effective in EONs when compared to fixed grid networks.
Starting Page	513
Ending Page	518
File Size	1445623
Page Count	6
File Format	PDF
ISBN	9781509017416
e-ISBN	9781479918768
DOI	10.1109/ICIINFS.2015.7399065
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-12-18
Publisher Place	Sri Lanka
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	WDM elastic optical networks survivability
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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