Probe-based schemes to guarantee lightpath quality of transmission (QoT) in transparent optical networks

Sambo, N.; Cugini, F.; Cerutti, Isabella; Valcarenghi, L.; Castoldi, P.; Poirrier, J.; Rouzic, Esther Le; Pinart, C.

doi:10.1109/ecoc.2008.4729518

Cited by 11 publications

(7 citation statements)

References 1 publication

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“…QoT estimation requires the collection of physical-layer information and the modeling of physical-layer performance. In the literature, several studies consider a single relevant parameter (e.g., equivalent length [9]) that accounts for the most detrimental physical impairment, or for several physical impairments, on each link. Then, physical-layer models combine the parameters of the links and nodes forming the alloptical segment.…”

Section: Qot Evaluationmentioning

confidence: 99%

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GMPLS-controlled dynamic translucent optical networks

et al. 2009

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ranslucent optical networks exploit the advantages of both transparent optical networks (where connections are switched in the optical domain) and opaque networks (where connections are optically terminated in each intermediate node and switched in the electrical domain)[1]. On the one hand, optical transparency offers considerable bandwidth at low cost. On the other hand, by performing opto-electronic signal regeneration at some of the intermediate nodes, it is possible to recover the signal degradation due to physical impairments. Both linear physical impairments (e.g., amplified spontaneous emission noise, chromatic dispersion, and polarization mode dispersion) and non-linear physical impairments due to intra-and inter-channel effects (e.g., self-phase modulation, four-wave mixing, cross-phase modulation, and cross-talk) contribute to the degradation of the optical signal quality. Such effects are especially critical for high data rates and limited wavelength spacing [2]. Opto-electronic regenerators are used to reamplify, reshape, and retime the optical signal (i.e., 3R regeneration) with the aim of guaranteeing the quality of transmission (QoT) required by the endto-end connections.In translucent optical networks, a requested connection can be supported either by a transparent lightpath, that is, a single all-optical segment, or by a translucent lightpath, that is, a sequence of all-optical segments connected by nodes that opto-electronically regenerate the signal. Thus, a careful regenerator placement and an intelligent regenerator utilization are fundamental for designing and managing cost-effective translucent optical networks with QoT guarantees. Several studies focused on centralized schemes for regenerator placement and routing and wavelength assignment in translucent optical networks [1, 3, 4] when connection requests are known in advance (i.e., static traffic scenario).Translucent optical networks with dynamic connection requests present additional cross-layer challenges. In [5], a framework is proposed to address these challenges assuming that updated information is available at each node. A first challenge is the regenerator placement, which should be tailored to the dynamic scenario. Indeed, specific algorithms are required to account not only for the present and estimated future network traffic, but also to account for the dynamic provisioning and rerouting of network resources [6]. Other challenges are the QoT evaluation and the dissemination of QoT-related information. The work in [7] proposes routing solutions when QoT information is inaccurate or outdated, for example, due to coarse measurements of QoT parameters and reduced availability of monitoring equipment. Moreover, another main challenge is the study of strategies for regenerator discovery and selection. Such strategies must be designed while keeping in mind that network state information may be available only locally and may change frequently due to the dynamic nature of the connection requests. All these issues T T AbstractThe evolut...

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Section: Qot Evaluationmentioning

confidence: 99%

“…In [9], the BER is measured on probe traffic, before transmitting data. If the measured BER is acceptable, then data transmission can start.…”

Section: Qot Evaluationmentioning

confidence: 99%

GMPLS-controlled dynamic translucent optical networks

et al. 2009

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“…The model predicts the output powers of WDM channels from an amplified system for different input conditions so that wavelength sets can be chosen intelligently for zero excursion. The model requires information about the accumulated gain ripple in the amplified link, and this can be measured using probe wavelength signals [18,19]. Fast-tunable lasers can also be used as short duration probes for gain spectrum measurements.…”

Section: Network Considerationsmentioning

confidence: 99%

Excursion-Free Dynamic Wavelength Switching in Amplified Optical Networks

Ahsan

Browning

Wang

et al. 2015

J. Opt. Commun. Netw.

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Dynamic optical networking with rapid wavelength reconfiguration is a promising capability to support the heterogeneous, bursty traffic rapidly growing in metroarea networks. A major obstacle to realizing dynamicity in the optical layer is the channel power excursions that occur due to continuously changing input conditions into gain controlled optical amplifiers. Here we present a technique of distributing an optical signal across multiple wavelengths chosen to reduce or cancel the power dynamics so that excursion-free switching can be achieved in an optically amplified transparent network. The use of variable wavelength dwell times for excursion-free switching using arbitrary wavelength pairs is presented. Spectral efficiency lost in utilizing multiple wavelengths is recovered through time-division multiplexing two signals distributed over the same wavelengths.

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“…However, QoT issues are outside the scope of the paper, and all the paths in P s,d are assumed to be feasible. For more details on QoT in WSONs, please refer to [26][27][28][29][30][31][32][33][34][35][36]. Then a path within P s,d is selected for signalling.…”

Section: Path Ifmentioning

confidence: 99%

Encompassing ROADM add/drop constraints in GMPLS‐based WSONs

Sambo

Cugini

Bottari

et al. 2011

Trans. Emerg. Telecomms. Techs.

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Different reconfigurable optical add/drop multiplexer (ROADM) architectures can be considered for the deployment of cost-effective wavelength switched optical networks (WSONs). They impose add/drop constraints that might significantly affect the efficient utilisation of the overall WSON resources.In this paper, the most relevant ROADM architectures and related constraints are first reviewed and discussed. Then novel provisioning schemes are proposed to effectively handle different ROADM architectures and provide a preference on the utilisation of add/drop resources with limited flexibility. The schemes are specifically designed to exploit the recently introduced generalised multiprotocol label switching extensions for the advertisement of capacity and/or availability of ROADM add/drop resources. Simulation results show that the proposed schemes guarantee the effective utilisation of the add/drop ROADM resources under several WSON scenarios.

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Probe-based schemes to guarantee lightpath quality of transmission (QoT) in transparent optical networks

Abstract: Two probe-based schemes are proposed to dynamically guarantee lightpath QoT in transparent optical networks. Low blocking and fast set up times are achieved within few lightpath set up attempts. . P.5.11

Cited by 11 publications

References 1 publication

GMPLS-controlled dynamic translucent optical networks

GMPLS-controlled dynamic translucent optical networks

Excursion-Free Dynamic Wavelength Switching in Amplified Optical Networks

Encompassing ROADM add/drop constraints in GMPLS‐based WSONs

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