Title: An efficient link based model for routing, modulation format and spectrum allocation with quality of transmission consideration in elastic optical networks

Authors: Sridhar Iyer; Shree Prakash Singh

Addresses: Department of ECE, Jain College of Engineering, T.S. Nagar-Machhe, Belagavi, Karnataka, 590014, India ' Division of ECE, Netaji Subhas Institute of Technology, Azad Hind Fauj Marg, Sector-3, Dwarka, New Delhi 110078, India

Abstract: Elastic optical networks (EONs) have provision long transmission reach (TR) and high spectral-efficiency (SE). Hence, compared to fixed-grid optical networks, in EONs, managing resources and addressing network design poses complex challenges. In this work, we formulate a link-based mixed integer linear program (MILP) model which considers quality of transmission (QoT) while determining the route, modulation format/level (MF/ML) and spectrum allocation (SA) for every request. To improve SE, model chooses the highest ML; however, when QoT is considered, TR of path with highest ML is very limited. Hence, model finds trade-off between ML, number of required frequency slots (FSs), and TR, with the objective of minimising required amount of network FSs so as to admit all requests. Finally, we evaluate and analyse model's performance and show that for simplicity, existing schemes impractically assume single MF (i.e., higher SE and ML) compared to fixed-grid networks, thereby ignoring the flexible nature of EONs.

Keywords: elastic optical networks; EONs; quality of transmission; QoT; mixed integer linear program; MILP; orthogonal frequency division multiplexing; OFDM; link based model.

DOI: 10.1504/IJIPT.2018.094529

International Journal of Internet Protocol Technology, 2018 Vol.11 No.3, pp.137 - 144

Received: 14 Feb 2017
Accepted: 08 Mar 2018
Published online: 05 Sep 2018 *

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