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
Static Routing and Spectrum Assignment for Deadline-Driven Bulk-Data Transfer in Elastic Optical Networks
TL;DR: This paper proposes joint frequency- and time-domain optimization algorithms of static routing and spectrum assignment for deadline-driven bulk-data transfer requests in elastic optical networks and provides a guideline on choosing scheduling schemes.
Journal ArticleDOI
Experimental evaluation of efficient routing and distributed spectrum allocation algorithms for GMPLS elastic networks.
TL;DR: This work presents and experimentally evaluates efficient strategies in GMPLS-controlled elastic optical networks for dynamic source/PCE routing algorithms that operate with aggregated optical spectrum information in combination with advanced distributed spectrum allocation algorithms.
Journal ArticleDOI
Routing, core, modulation level, and spectrum assignment based on image processing algorithms
TL;DR: These algorithms aim at efficiently utilizing the optical spectrum by considering the crosstalk between the cores of network fibers, as well as by avoiding the allocation of lightpaths that degrade the optical signal.
Journal ArticleDOI
All programmable and synthetic optical network: Architecture and implementation
TL;DR: A multitechnology, multirate, and adaptable network architecture for metropolitan/edge areas empowered by programmability in control and data planes is reported on, providing users with an open network platform to redefine and optimize its behavior and performance.
Proceedings ArticleDOI
Planning and provisioning of elastic O-OFDM networks with fragmentation-aware routing and spectrum assignment (RSA) algorithms
TL;DR: In this paper, two fragmentation-aware RSA algorithms are proposed to alleviate the bandwidth fragmentation in both static planning and dynamic provisioning of O-OFDM networks, and the proposed algorithms outperform two existing ones.
References
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OFDM for Optical Communications
TL;DR: In this paper, the authors give a tutorial overview of OFDM and highlight the aspects that are likely to be important in optical applications, and discuss the constraints imposed by single mode optical fiber, multimode optical fiber and optical wireless.
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).