Abstract

Elastic optical networks (EONs) are considered a very promising solution for next-generation optical networks. Elastic spectral bandwidth allocation promotes spectrum utilization efficiency and thus increases the network capacity. One of the fundamental problems in EONs is the routing and spectrum allocation (RSA) problem. Since real EONs may provide only a few regular line rates, we comprehensively study in this paper the dynamic RSA problem in EONs with several mixed line rates. To solve the dynamic RSA problem efficiently, we decompose the problem into RSA subproblems. For the routing subproblem, we propose an efficient multiconstrained routing algorithm named sorted feasible paths searching (SFPS) to find the shortest feasible paths for dynamic traffic demands. The completeness, optimality, and complexity of SFPS are proved. For the spectrum allocation subproblem, we propose two spectrum allocation strategies named fixed segmentation and adaptive segmentation to assign spectrum for the noncommensurate traffic demands of EONs with mixed line rates. Simulation results prove that the proposed dynamic RSA algorithms are time efficient and perform better than existing dynamic RSA algorithms in terms of bandwidth blocking probability and spectrum fragmentation ratio in EONs with mixed line rates.

© 2014 Optical Society of America

Fragmentation-Aware Routing and Spectrum Allocation Scheme Based on Distribution of Traffic Bandwidth in Elastic Optical Networks

Xin Chen, Juhao Li, Paikun Zhu, Ruizhi Tang, Zhangyuan Chen, and Yongqi He
J. Opt. Commun. Netw. 7(11) 1064-1074 (2015)

Tidal-Traffic-Aware Routing and Spectrum Allocation in Elastic Optical Networks

Boyuan Yan, Yongli Zhao, Xiaosong Yu, Wei Wang, Yu Wu, Ying Wang, and Jie Zhang
J. Opt. Commun. Netw. 10(11) 832-842 (2018)

Holding-Time- and Impairment-Aware Shared Spectrum Allocation in Mixed-Line-Rate Elastic Optical Networks

Jijun Zhao, Bowen Bao, Hui Yang, Eiji Oki, and Bijoy Chand Chatterjee
J. Opt. Commun. Netw. 11(6) 322-332 (2019)

Dynamic routing, spectrum, and modulation-format allocation in mixed-grid optical networks

Tanjila Ahmed, Sabidur Rahman, Sifat Ferdousi, Massimo Tornatore, Abhijit Mitra, Bijoy Chand Chatterjee, and Biswanath Mukherjee
J. Opt. Commun. Netw. 12(5) 79-88 (2020)

Using Spectrum Fragmentation to Better Allocate Time-Varying Connections in Elastic Optical Networks

Pouria Sayyad Khodashenas, Jaume Comellas, Salvatore Spadaro, Jordi Perelló, and Gabriel Junyent
J. Opt. Commun. Netw. 6(5) 433-440 (2014)