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Telecommunications operators are continuously exploring new alternatives to upgrade their networks in order to handle the ever increasing Internet traffic demand. However, a capacity upgrade is often accompanied by an increase in energy consumption, which affects not only the OPerational EXpenditures (OPEX) of the telecom carriers, but also their carbon footprint. An energy efficiency comparison of conventional path protection schemes for fixed-grid WDM and flexible-grid OFDM-based networks has been carried out. The survivable elastic network with SP scheme was found to offer the best energy efficiency per GHz at any traffic load value.
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