Nonlinear Impairment-Aware Static Resource Allocation in Elastic Optical Networks

Abstract

This paper studies the routing, modulation format, and spectrum allocation problem in elastic fiberoptical networks for static traffic. Elastic networks, based on Nyquist wavelength division multiplexing or optical orthogonal frequency division multiplexing, can efficiently utilize the optical fiber's bandwidth in an elastic manner by partitioning the bandwidth into hundreds or even thousands of subcarriers. Besides the amplified spontaneous emission noise, the nonlinear impairments of each connection is explicitly considered by utilizing an analytical model to calculate the nonlinear interference from other connections propagating in the same fibers. The objective of our work is to minimize the bandwidth, i.e., the number of used subcarriers, across the network, while satisfying demands on throughput and quality for all connections. A novel integer linear program formulation and low-complexity heuristics are proposed. Simulation results are presented to demonstrate the effectiveness of the proposed approaches. Compared with transmission reach-based benchmark methods, our methods can achieve up to 31% bandwidth reduction.Index Terms-NWDM, OOFDM, elastic optical networks, routing and spectrum assignment, physical impairments.

Performance Evaluation of Survivability Strategies for Elastic Optical Networks under Physical Layer Impairments

“…Considering these four effects are in line with what literature deals with. For this work we will use the physical layer model proposed in [17,18].…”

A Novel Traffic Grooming Scheme for Nonlinear Elastic Optical Network

“…Therefore, NLI become one of major penalties which affect the performance of EON. Nonlinearity-aware resource allocation scheme 3 use Gaussian noise (GN) model 4 as NLI model to minimize the maximum subcarrier index. However, the optimization has only been studied for static traffic matrix with large bandwidth requirements.…”

Optimized traffic profile for FlexGrid optical networks

“…In addition, the entire bandwidth of the connections must be contiguously allocated, also referred as the spectrum contiguity constraint. The Routing and Spectrum Allocation (RSA) problem in FlexGrid optical networks has been widely studied, considering the static traffic case (network planning phase) as well as dynamic (in operation) network scenarios [3][4][5][6][7][8][9][10][11][12][13]. There, connection arrival and departure processes are random and the network has to accommodate incoming traffic in real time.…”