Flexible optical transmission systems for future networking

Reis, Jacklyn D.; Garrich, Miquel; Pataca, Daniel M.; Diniz, Júlio C. M.; Rozental, Valery N.; Carvalho, Luis H. H.; Magalhães, Eduardo; Moura, Uiara Celine de; González, Neil Guerrero; Oliveira, Juliano R. F.; Oliveira, J. C. R. F.

doi:10.1109/netwks.2014.6958526

Cited by 8 publications

(7 citation statements)

References 14 publications

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“…On the L0, the DWDM (Dense Wavelength Division Multiplex) layer, there are no packet data. This is in stark difference to the traditional "optical SDN" (e.g., [4]) which tends to focus on transponders and their properties or on the Optical Transport Layer (OTN). This article therefore focuses on the media layer as defined in [5].…”

Section: Introductionmentioning

confidence: 92%

“…With AWs, the device cannot provide advanced diagnostics, such as OSNR measurements. 4 Essentially, the only metrics available are those which concern the raw signal amplitude and it spectral distribution. A typical ROADM measures these via an OCM, and through an optical Power Meter (PM).…”

Section: Yang Model For Roadmsmentioning

confidence: 99%

“…Please note that all description statements and other non-essential data have been removed from the YANG snippets in this article in order to conserve space. A full source is available[27] 4. For these purposes, we consider an AW to be a frequency channel with a central frequency and a spectral bandwidth with no additional data availablenot even the modulation format or the type of signal being carried.…”

mentioning

confidence: 99%

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YANG/NETCONF ROADM: Evolving Open DWDM Toward SDN Applications

Kundrát

Vojtěch

Škoda

et al. 2018

J. Lightwave Technol.

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Evolution in the field of optical networking in National Research and Education Networks led to utilization of Alien Wavelengths (AWs) and disaggregated Open Line Systems. Dynamic provisioning of AWs, in general spectrum services, is achieved via Reconfigurable Optical Add Drop Multiplexers (ROADMs) operating with flexible spectrum allocation. Northbound interface of these is usually implemented via the NETCONF protocol and through an appropriate Yet Another Next Generation (YANG) model. This paper presents a self-contained flexible spectral grid YANG model for low-level control and monitoring of a ROADM. The presented YANG model offers access to all functional components of a modern flexgrid ROADM and enables SDN applications to access and manipulate the media layer with no required external validation. The model is verified by an SDN application which implements optical path protection of AWs. A physical demonstration with model railroad intuitively shows the accomplished functionality.

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Section: Introductionmentioning

confidence: 92%

Section: Yang Model For Roadmsmentioning

confidence: 99%

mentioning

confidence: 99%

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YANG/NETCONF ROADM: Evolving Open DWDM Toward SDN Applications

Kundrát

Vojtěch

Škoda

et al. 2018

J. Lightwave Technol.

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“…In order to further support the dynamicity of traffic demands, flexgrid optical networks employ variable channel bandwidth to accommodate diverse modulation formats and data rates [19]. One implementation of flexgrid networks employs super-channels consisting of multiple contiguous sub-channels to enable higher data bandwidth and greater spectral efficiency [3].…”

Section: Super-channel Provisioningmentioning

confidence: 99%

Dynamic mitigation of EDFA power excursions with machine learning

Huang¹,

Gutterman²,

Samadi³

et al. 2017

Opt. Express

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Dynamic optical networking has promising potential to support the rapidly changing traffic demands in metro and long-haul networks. However, the improvement in dynamicity is hindered by wavelength-dependent power excursions in gain-controlled erbium doped fiber amplifiers (EDFA) when channels change rapidly. We introduce a general approach that leverages machine learning (ML) to characterize and mitigate the power excursions of EDFA systems with different equipment and scales. An ML engine is developed and experimentally validated to show accurate predictions of the power dynamics in cascaded EDFAs. Recommended channel provisioning based on the ML predictions achieves within 1% error of the lowest possible power excursion over 94% of the time. We also showcase significant mitigation of EDFA power excursions in super-channel provisioning when compared to the first-fit wavelength assignment algorithm.

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“…Las redes flexibles, propuestas en [10] y estandarizadas por la ITU [11], han sido ampliamente debatidas por la comunidad científica. Sin embargo, algunas tecnologías habilitadoras aún están en desarrollo como los transponders flexibles y los multiplexores reconfigurables (ROADM, Reconfigurable optical add drop multiplexer) con granularidades del orden de 12.5 GHz [12].…”

Section: Introductionunclassified

Redes ópticas elásticas: un nuevo paradigma en las futuras redes de telecomunicaciones

2015

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ResumenEl tráfico en las redes de datos por fibra óptica ha tenido un crecimiento exponencial debido a la creciente demanda de información por parte de los usuarios finales, llevando a una saturación en la capacidad de las redes actuales. Proyectando los sistemas de transmisiones ópticos a tasas superiores a los 400 Gbps para redes de largo alcance, no será posible mantener la tecnología WDM de rejilla espectral fija de 50 GHz, la cual permite transmitir en la actualidad tasas hasta los 100 Gbps. Teniendo como limitación además del ancho espectral que ocuparía la información, la conmutación de los dispositivos para trabajar a altas frecuencias. En este contexto, surge el concepto de las redes ópticas elásticas, donde se emplea una rejilla de espectro flexible (flexi-grid) o sin rejilla (grid-less), con ancho espectral variable por canal según la demanda de ancho de banda, permitiendo una separación espectral flexible entre canales con el propósito de optimizar la eficiencia en el uso del espectro. Este artículo hace una revisión de los nuevos conceptos tecnológicos que conllevan el escenario de redes elásticas, y los posibles retos y limitaciones para el desarrollo de estas tecnologías. Recientes pruebas experimentales incorporan nuevos conceptos tecnológicos con relación a los ya comerciales sistemas de 100-G como: el diseño de transmisores multicanales, el uso de tecnologías como Nyquist-WDM y OFDM óptico flexible, receptores digitales coherentes reconfigurables, formatos de modulación m-arios e híbridos y asignación dinámica del espectro. No obstante, grandes limitantes como los efectos no lineales de la fibra óptica deben ser foco de investigación en este nuevo escenario, debido a sus efectos en la degradación de la señal. Finalmente, se muestra como las técnicas de procesamiento digital de señales desempeñarán un papel importante para lograr la reconfigurabilidad y elasticidad de las redes de alta capacidad.AbstractIn the last years, traffic on data optical networks has had an exponential growth due to the increasing demand of information by end users. This had lead to saturation of the current deployed networks in terms of capacity. Planning the optical transmission systems of long-reach to work with capacities above 400 Gbps, it will not be possible to keep the spectral fixed-grid of the WDM technology, which currently allows transmitting up to 100 Gbps. The principal limitation is due to the greater spectral bandwidth occupied by the data information and also due to the switching of electronics devices at high frequencies. In this context a new concept known as elastic optical network emerges, which proposes a flexible-grid or gridless, where the spectral width changes according to the bandwidth demand and allows optimizing the spectral efficiency with a minimum separation between adjacent channels. In this paper, we present a comprehensive survey of elastic optical networks, introducing new concepts and describing the challenges and the limitations in these networks. Recent experimental reports show new technological concepts related to the commercials 100-G systems such as: design of multichannels transmitters, gridless Nyquist-WDM and Optical-OFDM, reconfigurable digital coherent receivers, optical dynamic spectrum allocation and advanced modulation formats. Nevertheless, the nonlinearity effects of the optical fiber are a significant limitation that must be researched in detail in this new elastic scenario. Hence, it is shown how the digital signal processing techniques are going to play an important role in order to get high capacity in elastic and reconfigurable networksPalabras clave: Comunicaciones por Fibra Óptica, Enrutamiento, Interferencia Intercanal (ICI), Multiplexación por División de Longitud de Onda, Óptica No-Lineal, Procesamiento Digital de Señales (DSP), Redes Ópticas.

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Flexible optical transmission systems for future networking

Cited by 8 publications

References 14 publications

YANG/NETCONF ROADM: Evolving Open DWDM Toward SDN Applications

YANG/NETCONF ROADM: Evolving Open DWDM Toward SDN Applications

Dynamic mitigation of EDFA power excursions with machine learning

Redes ópticas elásticas: un nuevo paradigma en las futuras redes de telecomunicaciones

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