# The Institution of Engineering and Technology 2006
22 January 2006
Electronics Letters online no: 20060233
doi: 10.1049/el:20060233
S. Taccheo and G. Della Valle (INFM – Dipartimento di Fisica
Politecnico di Milano – IFN-CNR, Milano, Italy)
E-mail: taccheo@polimi.it
K. Ennser (CNIT National Laboratory of Photonic Networks, Via G