[1] Univ Nacl Colombia, Grp Invest Elect & Comunicac Alta Frecuencia, Dept Ingn Elect & Elect, Carrera 45 26-85,Edificio Uriel Gutierrez, Bogota 11321, Colombia
[2] Tech Denmark Univ DTU, Photon Dept, Anker Engelunds Vej 1 Bygning 101A, DK-2800 Lyngby, Denmark
[3] Tech Univ Eindhoven, Electroopt Commun Sect, Dept Elect Engn, CP Box 513, NL-5612 AZ Eindhoven, Netherlands