1. Photonic Network System Laboratory, National Institute of Information, and Communications Technology, Tokyo, Japan
2. Nokia Bell Labs, New Providence, NJ, USA
3. Prysmian Group, Haisnes Cedex, France
4. Prysmian Group, Eindhoven, The Netherlands
5. KPN, The Hague, The Netherlands
6. University of L'Aquila and CNIT, L'Aquila, Italy
7. High Capacity Optical Transmission Laboratory, Electro-Optical Communications Group, Eindhoven University of Technology, Eindhoven, The Netherlands
8. Photonic Network System Laboratory, National Institute of Information, and Communications Technology, Koganei, Japan