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
On the Impact of Optimal Modulation and FEC Overhead on Future Optical Networks
TL;DR: In this paper, the potential of optimum selection of modulation and forward error correction (FEC) overhead (OH) in future wavelength-routed nonlinear optical mesh networks is studied from an information theory perspective.
Proceedings ArticleDOI
Joint anycast and unicast routing and spectrum allocation with dedicated path protection in Elastic Optical Networks
TL;DR: This paper forms Routing and Spectrum Allocation problem with Dedicated Path Protection consideration (RSA-JAU-DPP) as an Integer Linear Programming (ILP) problem and proposes a heuristic algorithm AFA-J AU- DPP to solve it and results show that proposed heuristic algorithms outperforms other reference methods.
Journal ArticleDOI
Virtual Network Embedding With Adaptive Modulation in Flexi-Grid Networks
TL;DR: This paper provides an integer linear programming (ILP) formulation for the VN embedding problem with geographical constraints in the context of flexi-grid optical networks where modulation modes can be selected optimally and proposes three polynomial-time heuristic algorithms where virtual links are embedded sequentially by three different sequences, respectively.
Journal ArticleDOI
Software reconfigurable highly flexible gain switched optical frequency comb source
TL;DR: The authors present the performance and noise properties of a software reconfigurable, FSR and wavelength tunable gain switched optical frequency comb source and demonstrate the excellent spectral quality of the comb tones and its outstanding stability highlighting its suitability for employment in next generation flexible optical transmission networks.
Journal ArticleDOI
Spectrum–block consumption for shared-path protection with joint failure probability in flexible bandwidth optical networks
TL;DR: A minimum-free-spectrum-block-consumption algorithm (MFSB) for shared-path protection with joint failure probability requirements in flexible bandwidth optical networks that efficiently decreases the spectrum block consumption and achieves higher spectrum utilization.
References
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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).