Flexible bandwidth and bit-rate programmability in future optical networks

Teipen, Brian T.; Grießer, Helmut; Eiselt, Michael

doi:10.1109/icton.2012.6253738

Cited by 9 publications

(3 citation statements)

References 7 publications

(11 reference statements)

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“…For an example, let us consider a set of modulation-rate pairs, their corresponding requirements of slices, and their achieved maximum transparent reach. Various examples of such set values are available in [23][24][25][26] for different transmission techniques (e.g., single carrier [23,25] or orthogonal frequency division multiplexing [24,26]), optical technologies, and physical layer parameters and settings (e.g., bandwidth versus reach trade-off). In this paper, the considered set of modulation-rate pairs, the number of slices, and the maximum transparent reach are taken from the experimental assessment described in [3,27].…”

Section: A Example Of the Selection Of The Modulation-rate Pairmentioning

confidence: 99%

“…Modulation formats are PM-16QAM and PM-QPSK. The maximum transparent reach is experimentally derived and is in the order of other experiments with similar physical layer settings, e.g., [25]. In Table I, the number of cards requested for the considered modulation-rate pairs is derived based on the transponder architecture in [27].…”

Section: A Example Of the Selection Of The Modulation-rate Pairmentioning

confidence: 99%

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On the Optimal Design of a Spectrum-Switched Optical Network With Multiple Modulation Formats and Rates

Popescu

Cerutti²,

Sambo³

et al. 2013

J. Opt. Commun. Netw.

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Spectrum-switched optical networks (SSONs) are an attractive solution for core networks. With respect to wavelength-switched optical networks (WSONs), they achieve a higher spectrum efficiency thanks to the use of a flexible grid, instead of a fixed one. In SSONs, the wellknown wavelength assignment (WA) problem of WSONs becomes a spectrum assignment (SA) problem. The SA problem aims at assigning a portion of the spectrum (called a frequency slot) to lightpaths. The width of the frequency slot depends on the requested bit rate and the modulation format adopted for the lightpath, and it is a multiple of the minimum bandwidth granularity, referred to as frequency slice. Thus, differently from WA, which assigns a single wavelength (or color) to each lightpath, SA assigns a set of colors (i.e., a set of frequency slices) to the lightpath. The shift from WA to SA introduces an additional constraint, which is related to the spectral adjacency of such frequency slices. This paper proves that the adjacency constraint in SA is not required and that by solving the WA problem (or the coloring problem) it is possible to derive a solution with spectrally adjacent slices in polynomial time. Based on such results, an integer linear programming formulation (ILP) for the optimal SA in a SSON with multi modulation formats and multi line rates (MMF/MLR) is presented for minimizing the network cost. The total cost of the network comprises the spectrum cost and the transponder card cost. Optimal results are presented for a MMF/MLR-SSON ring and show the amount of total occupied bandwidth and the network costs for different loads and ring lengths. Optimal selection of the modulation format and line rate is driven by the slice cost and the transponder card cost. Result comparison indicates that support of MMF and MLR is especially effective for improving spectrum utilization and allows spectrum saving up to 20% with respect to an SSON ring with single modulation format and line rate.

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Section: A Example Of the Selection Of The Modulation-rate Pairmentioning

confidence: 99%

Section: A Example Of the Selection Of The Modulation-rate Pairmentioning

confidence: 99%

On the Optimal Design of a Spectrum-Switched Optical Network With Multiple Modulation Formats and Rates

Popescu

Cerutti²,

Sambo³

et al. 2013

J. Opt. Commun. Netw.

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“…There is yet another feature which makes EON an attractive approach. Namely, the use of software-defined transponders [16] and the adaptation of modulation levels [17], according to transmission path characteristics, brings significant savings in terms of spectrum utilization [18]. Since the transmission on shorter paths can be performed with higher modulation levels, thus requiring less spectrum, anycast clients may decide to connect nearer replicas and allocate less spectrum to lightpaths.…”

Section: Introductionmentioning

confidence: 99%

Joint anycast and unicast routing for elastic optical networks: Modeling and optimization

Walkowiak

Klinkowski

2013

2013 IEEE International Conference on Communications (ICC)

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Anycast communication is gaining much interest due to the deployment and the growing importance of new network services, including Content Delivery Networks (CDNs) and grid/cloud computing, among others. Concurrently, elastic optical networks (EONs), being a very promising solution for future optical transport networks, are considered as effective and costefficient approach for supporting such bandwidth-demanding applications. In this article, we focus on anycast communication in EON. Specifically, we formulate a joint anycast and unicast Routing and Spectrum Allocation (RSA/JAU) off-line optimization problem and solve it by means of both Integer Linear Programming (ILP) and dedicated heuristic algorithms. We evaluate the performance of algorithms and assess the effectiveness of anycast communication under various network scenarios. The main conclusion is that anycast routing brings significant spectrum savings in EON.

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Flexible Optical Networks

Simmons

2014

Optical Networks

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Flexible bandwidth and bit-rate programmability in future optical networks

Abstract: Recent progress in network equipment allows trade-offs to be made between the optical bandwidth, distancereach, and bit-rate for given optical data channels. We discuss methods to increase the utilization of network resources and thereby to lower the network's cost-per-bit of transport.

Cited by 9 publications

References 7 publications

On the Optimal Design of a Spectrum-Switched Optical Network With Multiple Modulation Formats and Rates

On the Optimal Design of a Spectrum-Switched Optical Network With Multiple Modulation Formats and Rates

Joint anycast and unicast routing for elastic optical networks: Modeling and optimization

Flexible Optical Networks

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