1. Department of Electromagnetic Field, Faculty of Electrical Engineering, Czech Technical University in Prague, Prague, Czech Republic
2. II-VI Inc. (now Coherent Corporation), Thuan An, Vietnam
3. Network Research Institute, National Institute of Information and Communication, Tokyo, Japan
4. Optical Communication Research Group, Northumbria University at Newcastle, Newcastle upon Tyne, U.K.
5. Instituto de Telecomunicaciones y Aplicaciones Multimedia (ITEAM), Universitat Politècnica de València, València, Spain