1. Department of EnergyInformation Engineering and Mathematical Models (DEIM)University of PalermoViale delle Scienze Bld. 990128PalermoItaly
2. Optical Communications Research GroupNCRLabFaculty of Engineering and EnvironmentNorthumbria UniversityNewcastle upon TyneNE1 8STUnited Kingdom
3. Optical and Quantum Communications GroupInstitute of Telecommunications and Multimedia Applications (iTEAM)Universitat Politècnica de València46022ValènciaSpain