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Photonics 2014, 1(3), 235-250; doi:10.3390/photonics1030235

Energy-Saving Mechanism in WDM/TDM-PON Based on Upstream Network Traffic

1,* , 2
1 Universitat Politècnica de Catalunya, Esteve Terradas 7, 08860 Barcelona, Spain 2 Politecnico di Milano, Via Ponzio 34/5, 20133 Milan, Italy
* Author to whom correspondence should be addressed.
Received: 21 July 2014 / Accepted: 5 August 2014 / Published: 12 August 2014
(This article belongs to the Special Issue All Optical Networks for Communications)
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One of the main challenges of Passive Optical Networks (PONs) is the resource (bandwidth and wavelength) management. Since it has been shown that access networks consume a significant part of the overall energy of the telecom networks, the resource management schemes should also consider energy minimization strategies. To sustain the increased bandwidth demand of emerging applications in the access section of the network, it is expected that next generation optical access networks will adopt the wavelength division/time division multiplexing (WDM/TDM) technique to increase PONs capacity. Compared with traditional PONs, the architecture of a WDM/TDM-PON requires more transceivers/receivers, hence they are expected to consume more energy. In this paper, we focus on the energy minimization in WDM/TDM-PONs and we propose an energy-efficient Dynamic Bandwidth and Wavelength Allocation mechanism whose objective is to turn off, whenever possible, the unnecessary upstream traffic receivers at the Optical Line Terminal (OLT). We evaluate our mechanism in different scenarios and show that the proper use of upstream channels leads to relevant energy savings. Our proposed energy-saving mechanism is able to save energy at the OLT while maintaining the introduced penalties in terms of packet delay and cycle time within an acceptable range. We might highlight the benefits of our proposal as a mechanism that maximizes the channel utilization. Detailed implementation of the proposed algorithm is presented, and simulation results are reported to quantify energy savings and effects on network performance on different network scenarios.
Keywords: PON; WDM/TDM-PON; energy-saving; channel utilization PON; WDM/TDM-PON; energy-saving; channel utilization
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Garfias, P.; De Andrade, M.; Tornatore, M.; Buttaboni, A.; Sallent, S.; Gutiérrez, L. Energy-Saving Mechanism in WDM/TDM-PON Based on Upstream Network Traffic. Photonics 2014, 1, 235-250.

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