1. Microwave Photonics GmbH, Essener Str. 5,Oberhausen,Germany,46047
2. Ruhr University Bochum, Photonics and Terahertz Technology, Universitätsstr. 150,Bochum,Germany,44801
3. University of Duisburg-Essen,Department of Optoelectronics, Lotharstr. 55,Duisburg,Germany,47057