Impact of Reducing Channel Spacing from 50GHz to 37.5GHz in Fully Transparent Meshed Networks

Morea, Annalisa; Renaudier, J.; Ghazisaeidi, Amirhossein; Bertran-Pardo, O.; Zami, Thierry

doi:10.1364/ofc.2014.th1e.4

Cited by 23 publications

(19 citation statements)

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“…Early DWDM used 2.5 and 10 Gb/s direct detection, and with up to 90 channels available (but often only 40), this provided an optical fibre capacity of about 100 Gb/s for the early 2.5 Gb/s systems up to 900 Gb/s for the 10 Gb/s systems that followed. This capacity is no longer sufficient for many of the world's core networks, which continue to grow at around 30-40% per year [5].…”

Section: Flexible Transmissionmentioning

confidence: 99%

“…Guard bands [10] are usually required between independent channels to prevent cross talk building up between them and to allow for the optical filters to separate them. Additionally, the WSS has a non-zero roll-off function and a cascade of these can significantly attenuate parts of the signal spectrum if the guard bands are not set properly.…”

Section: Super-channelsmentioning

confidence: 99%

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Core Networks in the Flexgrid Era

Lord

Wright

Mitra

2015

J. Lightwave Technol.

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Section: Flexible Transmissionmentioning

confidence: 99%

Section: Super-channelsmentioning

confidence: 99%

Core Networks in the Flexgrid Era

Lord

Wright

Mitra

2015

J. Lightwave Technol.

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“…Such a combination enables significant transmission performance, e.g., in terms of spectral efficiency. However, it is important to highlight that the proposed superfilter technique can also be applied and validated with different transmission techniques and different filter bandwidth values (e.g., as in the case of [7]). …”

Section: Related Workmentioning

confidence: 99%

“…One of the most relevant degradations can be represented by filtering cascade effects [7,8]. Indeed, BV-OXCs include filters with nonideal shapes.…”

Section: Introductionmentioning

confidence: 99%

Superfilter Technique in SDN-Controlled Elastic Optical Networks [Invited]

Paolucci¹,

Cugini

Fresi³

et al. 2014

J. Opt. Commun. Netw.

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In flexigrid elastic optical networks, filtering cascade effects strongly affect the overall transmission performance. To avoid these detrimental impairments, each lightpath is typically configured, in an independent way, to encompass additional spectrum resources. Thus, the flat central region of the traversed filters are exploited and their transition region around the cutoff frequencies is avoided. However, handling lightpaths independently leads to less efficient spectrum utilization. In this study, we propose a novel technique, called superfilters, which enables different lightpaths, with different source-destination pairs, to coexist within the same flat region of a single filter configuration. That is, the technique consists of a pathcomputation strategy that applies differentiated configurations of lightpath traversed filters, which are decoupled from head-end lightpath configurations. Simulative transmission results are provided to assess the benefits of the proposed technique. Then, an experimental implementation is presented, including a software-defined networking implementation successfully applied to a flexigrid network testbed.

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“…The paper was submitted in part at the IEEE International Conference on Communications (ICC 2015), London, UK, June 2015 through the simple adoption of Nyquist-shaped signaling, as the effect of crossing ROADMs, and therefore cascaded WSS filtering, is detrimental even after a few nodes [6].…”

Section: Introductionmentioning

confidence: 99%

Spectral Efficiency Optimization in Flexi-Grid Long-Haul Optical Systems

Foggi¹,

Colavolpe

Bononi

et al. 2015

J. Lightwave Technol.

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Abstract-Flexible grid optical networks allow a better exploitation of fiber capacity, by enabling a denser frequency allocation. A tighter channel spacing, however, requires narrower filters, which increase linear intersymbol interference (ISI), and may dramatically reduce system reach. Commercial coherent receivers are based on symbol by symbol detectors, which are quite sensitive to ISI. In this context, Nyquist spacing is considered as the ultimate limit to wavelength-division multiplexing (WDM) packing.In this paper, we show that by introducing a limited-complexity trellis processing at the receiver, either the reach of Nyquist WDM flexi-grid networks can be significantly extended, or a denser-than-Nyquist channel packing (i.e., a higher spectral efficiency (SE)) is possible at equal reach. By adopting wellknown information-theoretic techniques, we design a limitedcomplexity trellis processing and quantify its SE gain in flexigrid architectures where wavelength selective switches over a frequency grid of 12.5GHz are employed.

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Impact of Reducing Channel Spacing from 50GHz to 37.5GHz in Fully Transparent Meshed Networks

Cited by 23 publications

References 0 publications

Core Networks in the Flexgrid Era

Core Networks in the Flexgrid Era

Superfilter Technique in SDN-Controlled Elastic Optical Networks [Invited]

Spectral Efficiency Optimization in Flexi-Grid Long-Haul Optical Systems

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