1. Photonics Communications Research Laboratory, National Technical University of Athens, Athens, Greece
2. Joint Laboratory of Silicon Photonics, Technical University of Berlin, Berlin, Germany
3. COBRA Research Institute , Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
4. Photonics Research Group, INTEC Department, Ghent University-IMEC, Ghent, Belgium
5. Fraunhofer-Institut für Nachrichtentechnik, Heinrich-Hertz-Institut, Berlin, Germany
6. Joint Laboratory of Silicon Photonics, IHP Microelectronics Technology, Frankfurt (Oder), Germany
7. Transport and OPB Innovation Department, Telecom Italia, Torino, Italy