Affiliation: | (1) Department of Electrical and Electronic Engineering, University of Western Australia, 6009 Nedlands, Australia;(2) Telecom Australia Research Laboratories, 770 Blackburn Road, 3168 Clayton North, Victoria, Australia;(3) Present address: Siemens AG, ZFE FL OPT 23, Otto-Hahn-Ring 6, D-8000 Munich 83, Federal Republic of Germany |