1. Nokia Bell Labs, Paris-Saclay, France
2. Infinera, Munich, Germany
3. III-V Lab, Joint Laboratory of Nokia Bell Labs, Thales Research and Technology and CEA Leti, Palaiseau, France
4. Fraunhofer Heinrich Hertz Institute (HHI), Berlin, Germany
5. OFS Laboratories, Somerset, NJ, USA
6. Department of Electrical and Electronic Engineering, Aston University, Birmingham, U.K.
7. Nokia Bell Labs, Murray Hill, NJ, USA
8. Optoelectronics Research Center, University of Southampton, Southampton, U.K.
9. Department of Electronics and Telecommunications, Politecnico di Torino, Turin, Italy