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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Proceedings ArticleDOI
Dynamic Multi-Modulation Allocation Scheme for Elastic Optical Networks
TL;DR: In this paper, the authors proposed a new modulation scheme that enables the routing of traffic through dynamic multi-modulation allocation in multiple hops to achieve blocking performance improvement in EON.
Proceedings ArticleDOI
Adaptive Spectrum Allocation Algorithm for Elastic Optical Networks with Survivability
TL;DR: Simulation results show that the proposed adaptive spectrum allocation algorithm for EONs in the case of survivability outperforms existing algorithms and provides savings for the normalized revenue loss up to 45% over the static first-fit RSA.
Journal ArticleDOI
Optical OFDM-based Data Center Networks
TL;DR: A novel architecture for data center networks based on optical OFDM using Wavelength Selective Swithces(WSS) provides high throughput, reduced latency and fine grain bandwidth allocation and the power analysis shows that the proposed scheme is almost 60% more energy efficient compared to the current networksbased on eommodity switches.
Journal Article
Algorithms of Routing and Spectrum Assignment in Spectrum Flexible Transparent Optical Networks
TL;DR: In this article, the authors considered the problem of routing and spectrum assignment (RSA) taking into consideration minimizing the length of the transmission distance under spectrum continuity constraints and the relationship between the traffic bitrates and the spectrum bandwidth.
Book ChapterDOI
Elastic Optical Network: A Promising Solution for Future Communication Networks Considering Differentiated CoS
TL;DR: In this article, the authors proposed a new cost-based CoS RSA strategy in order to reduce blocking probability (BP) in elastic optical network (EON), which shows significant reduction in BP.
References
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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
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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
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