Abstract
We apply an adaptive forward error correction (FEC) allocation strategy to an Elastic Optical Network (EON) operated with shared backup path protection (SBPP). To maximize the protected network capacity that can be carried, an Integer Linear Programing (ILP) model and a spectrum window plane (SWP)-based heuristic algorithm are developed. Simulation results show that the FEC coding overhead required by the adaptive FEC scheme is significantly lower than that needed by a fixed FEC allocation strategy resulting in higher network capacity for the adaptive strategy. The adaptive FEC allocation strategy can also significantly outperform the fixed FEC allocation strategy both in terms of the spare capacity redundancy and the average FEC coding overhead needed per optical channel. The proposed heuristic algorithm is efficient and not only performs closer to the ILP model but also does much better than the shortest-path algorithm.
Highlights
Flexi-grid elastic optical networks (EONs) have received extensive interest because of their flexibility in bandwidth allocation and high spectrum efficiency [1, 2]
We present the routing and spectrum assignment (RSA) problem for an EON with shared backup path protection (SBPP)-based adaptive Forward error correction (FEC) allocation and formulate this with a path-arc Integer Linear Programing (ILP) optimization model
To study the performance of the proposed strategy, as compared with the standard shortest-path algorithm, we develop an ILP based optimization model and a SWPbased heuristic algorithm, both to maximize the effective protected transmission capacity and to minimize the spare capacity required for network protection
Summary
Flexi-grid elastic optical networks (EONs) have received extensive interest because of their flexibility in bandwidth allocation and high spectrum efficiency [1, 2]. Forward error correction (FEC) [6,7,8,9,10,11,12,13,14,15,16] coding techniques with low hardware investment cost and high error-correction performance can effectively compensate for this degradation This is by adding redundant overhead bits appropriately to the information bits before modulation and transmission. We had tackled the low efficiency of this fixed FEC allocation strategy by proposing an adaptive FEC allocation strategy for optical channels in [4, 5] to show that the adaptive strategy significantly improves the spectral efficiency of the EON These studies only considered the case without network protection. Comparing the performances of these three approaches, it is evident that the adaptive FEC allocation strategy proposed by us is very effective in significantly increasing the network capacity of an EON
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