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We extend past work presented at ICTON 2015, where we reviewed and extended a number of dynamic traffic grooming algorithms proposed by Zhang et al. for elastic optical networks. In that paper we showed that, on the one hand, different grooming policies lead to different connection blocking ratios and have different associated economic costs. On the other hand, different types of transceivers (supporting...
Software defined optical transmission (SDOT) and sliceable programmable transceivers, exploiting multiple dimensions and photonic technologies, enable to support future networks with advanced and novel functionalities, meeting the capacity and reach targets, according to the segment requirements. Programmability and modularity are crucial for scalability and functional disaggregation, facilitating...
This work is focused on the characterization of the traffic allocated in Elastic Optical backbone networks when different dynamic traffic profiles are generated. Extensive simulations are done to statistically model the real-time traffic carried by this kind of networks. Well known topologies such as NSFNet and US_Backbone are considered as well as different parameters applied to the traffic generation...
In this paper we demonstrate a low-complexity pre-emphasis technique for electronic subcarrier-multiplexed signals to mitigate transceiver bandwidth limitations. As opposed to traditional FFT/FIR-based pre-emphasis techniques, we propose a simple and effective power-ratio optimization between electronic subcarriers that requires only 1 real multiplication per subcarrier.
We apply the statistical network assessment process (SNAP) to estimate merit of flex- vs. fix-grid spectral-use with increasing-size traffic grooming (RG) of 20, 40 and 100 Gbps and progressive traffic requests on the residual C-band of the Italian network, partially loaded by legacy and defragmented traffic with a residual bandwidth percentage (RBP) of 25%, 50% and 75%. We show how the blocking probability...
Flexible-grid elastic optical networks (EONs) are expected to substitute in near future fixed-grid wavelength division multiplexing (WDM) optical networks. The previous works that were focused on optimization of EONs take many different assumptions regarding the transmission reach of modulation formats (MFs). However, according to the best of our knowledge, there have been no comparative analysis...
We review the statistical network assessment process (SNAP) and apply it to the analysis of two different network topologies. Using SNAP, we identify topological bottlenecks and we test the effectiveness of physical layer solutions in unlocking them. We show how selected introduction of spatial division multiplexing (SDM) through fiber doubling enables to achieving a 63% and 12% capacity increase...
Estimating the Quality of Transmission (QoT) of lightpaths is crucial for reducing provisioned margins, making optimized dynamic decisions, and localizing failures. We leverage a QoT estimation tool that uses feedback from the network in order to provide accurate QoT estimations. We propose a scheme to establish active monitoring lightpaths (i.e., probe lightpaths used only for monitoring purposes)...
We evaluate how the joint selective introduction of improved hybrid amplification technologies at inline amplification sites and advanced digital signal processing (DSP) techniques at transceivers allows to greatly reduce the number of required optical-electro-optical (OEO) regenerators in transparent optical networks. We perform quantitative studies on two different topologies, focusing on two different...
Achievable information rates are discussed as a tool to analyse and design optical networks. It is shown that the maximum throughput of the network and its dependency of different network parameters can be predicted with such a tool.
COCONUT project demonstrated an innovative DWDM Passive Optical Network implementing the full λ-to-the-user concept in a filterless distribution fiber network. We make use of an innovative class of coherent transceivers that exploit the advantages of coherent detection in terms of sensitivity and channel selectivity in a cost efficient manner. The different transceivers developed target different...
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