1. Scuola Superiore Sant'Annavia Moruzzi 1 Pisa 56124 Italy
2. CNIT Photonic Networks National Laboratoryvia Moruzzi 1 Pisa 56124 Italy
3. University of California Santa Barbara CA 93106 USA
4. Technische Universität WienInstitute of Electrodynamics, Microwave and Circuit EngineeringGusshausstrasse 25/354 Vienna 1040 Austria
5. IHP – Leibniz‐Institut für innovative MikroelektronikIm Technologiepark 25 D‐15236 Frankfurt (Oder) Germany
6. CEA LETI, Minatec17 Rue des Martyrs Grenoble 38054 France
7. Ericsson Researchvia Moruzzi 1 Pisa 56124 Italy