On the legacy amplifier limitation in flexgrid optical networks

Amar, Djamel; Kanj, Mohamad; Augé, Jean-Luc; Brochier, Nicolas; Rouzic, Esther Le; Lepers, Catherine; Cousin, Bernard

doi:10.1109/ps.2015.7328990

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…selection/configuration of optical amplifiers) is an important phase to determine optical resources limits over every optical link. To this end, we have developed a link design method, which we presented in [4][17] [18], taking advantage of the optimization strategy presented in [19]. Surely, any other design method could be used instead to determine these power resources.…”

Section: A Design Methodsmentioning

confidence: 99%

Optical Power Control in GMPLS Control Plane

Kanj¹,

Rouzic²,

Meuric³

et al. 2016

J. Opt. Commun. Netw.

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International audienceThe exponential traffic growth in optical networks has triggered the evolution from Fixed-Grid to Flex-Grid technology. This evolution allows better spectral efficiency and spectrum usage over current optical networks in order to facilitate huge dynamic traffic demands. The promise of Flex-Grid technology in terms of increasing the number of optical channels established over optical links may however not be sustainable because of the associated increase in optical amplification power. In this work, we detail a power control process that takes advantage of link optical power and channel optical signal to noise ratio (OSNR) margins to allow network operators to support this optical power increase while maintaining the use of legacy optical amplifiers. New GMPLS protocol extensions are proposed to integrate the optical power control process in the control plane. The performance of the process is evaluated in terms of the blocking ratio and network throughput over Fixed-Grid and Flex-Grid networks. Results show that controlling optical power benefits from the Flex-Grid technology in terms of spectrum and capacity gain and reduces optical connection blocking

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Section: A Design Methodsmentioning

confidence: 99%

Optical Power Control in GMPLS Control Plane

Kanj¹,

Rouzic²,

Meuric³

et al. 2016

J. Opt. Commun. Netw.

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“…In order to evaluate our power control process, we have to precisely model the link design step. To this end, we have developed a link design method, which we briefly presented in [13], taking advantage of the optimization strategy presented in [14]. Note that our proposed power control can work with any other design method.…”

Section: B Design Methodsmentioning

confidence: 99%

Optical power control to efficiently handle flex-grid spectrum gain over existing fixed-grid network infrastructures

Kanj¹,

Rouzic²,

Amar³

et al. 2016

2016 International Conference on Computing, Networking and Communications (ICNC)

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The exponential traffic growth in optical networks has triggered the evolution from Fixed-Grid to Flex-Grid technology. This evolution allows better spectral efficiency and spectrum usage over current networks in order to facilitate dynamic and huge traffic demands. The integration of Flex-Grid technology increases the number of optical channels established over optical links, leading, however, to an increase in amplification power and possibly saturating optical amplifiers. In this work, we propose a power adaptation process that takes advantage of link optical signal to noise ratio (OSNR) margins to allow network operators to support this power increase while maintaining the use of legacy amplifiers. Results show that controlling channel optical power benefits from the Flex-Grid in terms of spectrum and capacity gain using in-place amplifier infrastructure.

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“…However, this capacity increase may not be sustainable, because of the associated increase in optical amplification power 1 . In fact, the increasing number of optical channels gives rise to a power saturation problem in legacy amplifiers when migrating from fixed-grid to flex-grid networks 2,3 .We demonstrated in 2,3 that avoiding saturation problem is possible through adapting channels optical power. This adaptation is possible by converting the OSNR margins (OSN R margin ) into optical power attenuation over optical links 1,4 .…”

mentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Power-Aware Regeneration Algorithm in Flex-grid Networks

Kanj

Rouzic

Cousin

2017

2017 European Conference on Optical Communication (ECOC)

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Flex-grid technology increases network links capacity and optical power levels, creating power saturation problem in legacy amplifiers. We demonstrate that optimizing regeneration sites allows reducing the optical power of highly loaded links, avoiding amplifiers saturation over the existing fixedgrid networks. IntroductionFlex-Grid is a promising technology that allows better spectral efficiency and spectrum usage in optical networks. It offers the possibility to create additional channels in the same available bandwidth (C band) and thus improving network capacity. However, this capacity increase may not be sustainable, because of the associated increase in optical amplification power 1 . In fact, the increasing number of optical channels gives rise to a power saturation problem in legacy amplifiers when migrating from fixed-grid to flex-grid networks 2,3 .We demonstrated in 2,3 that avoiding saturation problem is possible through adapting channels optical power. This adaptation is possible by converting the OSNR margins (OSN R margin ) into optical power attenuation over optical links 1,4 . However, this power saturation can always arise over highly loaded links as demonstrated in 5 , especially when there is no sufficient exploitable OSNR margins.In fact, the OSN R margin is an important parameter to optimize network performance and to increase its capacity as demonstrated in many works in the literature 6,7 . It gives the possibility to optimize different transmission parameters, such as modulation format, optical power, baud/bit rates and coding scheme. In this work, we consider only the channel power adaptation, in order to reduce the power level over highly loaded links and avoid power saturation. The higher is the OSN R margin , the higher is the power attenuation that can be applied to an optical channel 5 .In this paper, we will show how regeneration sites impact the OSNR margins of established channels. Then, we present through an example the execution result of the developed poweraware regeneration algorithm (PAR). Finally, the performance of the algorithm is evaluated.

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On the legacy amplifier limitation in flexgrid optical networks

Cited by 4 publications

References 5 publications

Optical Power Control in GMPLS Control Plane

Optical Power Control in GMPLS Control Plane

Optical power control to efficiently handle flex-grid spectrum gain over existing fixed-grid network infrastructures

Power-Aware Regeneration Algorithm in Flex-grid Networks

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