The National Institute of Telecommunications, Department of Transmission and Optical Technologies in Warsaw, together with the Department of Information Technologies and Communications of the Technical University of Cartagena, and the IEEE Photonics Society Poland Chapter are pleased to announce the 15th International Conference on Transparent Optical Networks ICTON 2013 which will be kindly hosted at the El Batel Auditorium and Convention Center, Cartagena, Spain, June 23-27, 2013. Technical co-sponsorship by the IEEE Photonics Society is foreseen. The El Batel Auditorium is located next to the seafront and the marina, walking-distance to city centre, cultural and touristic places. Cartagena is famous of its unique artistic heritage, with a number of landmarks such as the Roman Theatre and a lot of of Phoenician, Roman, Byzantine and Moorish remains.