Journal ArticleDOI
Elastic Bandwidth Allocation in Flexible OFDM-Based Optical Networks
TLDR
This work introduces the Routing, Modulation Level and Spectrum Allocation (RMLSA) problem, as opposed to the typical Routing and Wavelength Assignment (RWA) problem of traditional WDM networks, proves that it is also NP-complete and presents various algorithms to solve it.Abstract:
Orthogonal Frequency Division Multiplexing (OFDM) has recently been proposed as a modulation technique for optical networks, because of its good spectral efficiency, flexibility, and tolerance to impairments. We consider the planning problem of an OFDM optical network, where we are given a traffic matrix that includes the requested transmission rates of the connections to be served. Connections are provisioned for their requested rate by elastically allocating spectrum using a variable number of OFDM subcarriers and choosing an appropriate modulation level, taking into account the transmission distance. We introduce the Routing, Modulation Level and Spectrum Allocation (RMLSA) problem, as opposed to the typical Routing and Wavelength Assignment (RWA) problem of traditional WDM networks, prove that is also NP-complete and present various algorithms to solve it. We start by presenting an optimal ILP RMLSA algorithm that minimizes the spectrum used to serve the traffic matrix, and also present a decomposition method that breaks RMLSA into its two substituent subproblems, namely 1) routing and modulation level and 2) spectrum allocation (RML+SA), and solves them sequentially. We also propose a heuristic algorithm that serves connections one-by-one and use it to solve the planning problem by sequentially serving all the connections in the traffic matrix. In the sequential algorithm, we investigate two policies for defining the order in which connections are considered. We also use a simulated annealing meta-heuristic to obtain even better orderings. We examine the performance of the proposed algorithms through simulation experiments and evaluate the spectrum utilization benefits that can be obtained by utilizing OFDM elastic bandwidth allocation, when compared to a traditional WDM network.read more
Citations
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Journal ArticleDOI
Online service provisioning in elastic optical networks with hybrid algorithm for congestion aware routing and spectrum allocation
TL;DR: A hybrid scheme is proposed for routing and spectrum allocation (RSA) in EON which helps to efficiently reduce network blocking probabilities in different network scenarios as the optimization model manages to route traffic load to the underutilized links when the quality of service of lightpaths on the overutilization links meet the desired threshold congestion level.
Book ChapterDOI
Elastic Optical Networks
TL;DR: Several optimization problems that arise in EONs in the context of cloud computing and content-oriented networking requirements are formulated and discussed.
Book ChapterDOI
Elastic Optical Networking
Ori Gerstel,Masahiko Jinno +1 more
TL;DR: This chapter introduces elastic optical networking, which is a new paradigm for the wavelength division multiplexing (WDM) layer, based on a much more flexible use of the spectrum without a rigid wavelength grid, transponders that can be programmed for different modulation formats, and impairment-aware control planes that tie the client layer and the optical layer together.
Proceedings ArticleDOI
Alternative routing and zone-based spectrum assignment algorithm for flexgrid optical networks
TL;DR: A novel algorithm is proposed that introduces a zone-based assignment policy together with an alternative path routing mechanism based on the maximum capacity available and reduces the blocking ratio of high rates connections, in some cases, by a factor of six.
Proceedings ArticleDOI
The future of optical interconnects for data centers: A review of technology trends
TL;DR: This paper provides a look at the entire system while considering various hierarchical levels - from small-scale interconnects on a single chip to system-level rack-to-rack interconnection networks - and discusses design considerations and future research directions towards advanced optical interConnects.
References
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Journal ArticleDOI
OFDM for Optical Communications
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Journal ArticleDOI
Spectrum-efficient and scalable elastic optical path network: architecture, benefits, and enabling technologies
Masahiko Jinno,Hidehiko Takara,Bartlomiej Kozicki,Yukio Tsukishima,Yoshiaki Sone,Shinji Matsuoka +5 more
TL;DR: This article proposes a novel, spectrum- efficient, and scalable optical transport network architecture called SLICE, which enables sub-wavelength, superwa wavelength, and multiple-rate data traffic accommodation in a highly spectrum-efficient manner, thereby providing a fractional bandwidth service.
Journal ArticleDOI
Distance-adaptive spectrum resource allocation in spectrum-sliced elastic optical path network [Topics in Optical Communications]
Masahiko Jinno,Bartlomiej Kozicki,Hidehiko Takara,Atsushi Watanabe,Yoshiaki Sone,Takafumi Tanaka,Akira Hirano +6 more
TL;DR: A concept of a novel adaptation scheme in SLICE called distance-adaptive spectrum resource allocation, which can save more than 45 percent of required spectrum resources for a 12-node ring network, is presented.
Journal ArticleDOI
Optical burst switching: a new area in optical networking research
Yang Chen,Chunming Qiao,Xiang Yu +2 more
TL;DR: This tutorial gives an introduction to optical burst switching and compare it with other existing optical switching paradigms, and describes a prevailing protocol for OBS networks called just-enough-time (JET).