| Affiliation: | a School of Optoelectronics, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing 100081, Chinab School of Information and Communication Technology, Royal Institute of Technology, Electrum 229, Kista, Stockholm, SE-164 40, Swedenc Department of Networking and Transmission Laboratory, Acreo AB, Electrum 236, Kista, Stockholm, SE-164 40, Swedend Fraunhofer Institute for Applied Solid State Physics, Tullastr. 72, 79108 Freiburg, Germanye u²t Photonics AG, Reuchlinstrasse 10/11, 10553 Berlin, Germanyf Department of Photonic Components-Integration Technology, Fraunhofer Institute for Telecommunications, Heinrich-Hertz-Institut, Einsteinufer 37, 10587 Berlin, Germany |
