1. Department of Electronic and Electrical Engineering; UCL; London United Kingdom
2. School of Electrical and Computer Engineering, UNICAMP; Campinas-SP Brazil
3. School of Electrical Engineering, PUC-Campinas; Campinas SP Brazil
4. CECS, UFABC; Santo André SP Brazil
5. Optics and Photonics Research Center, IFGW/UNICAMP; Campinas SP Brazil