[1] Inst Telecomunicacoes, P-3810193 Aveiro, Portugal
[2] EXFO Inc, R&D Dept, Montreal, PQ H4S 0A4, Canada
[3] Intel Deutschland GmbH, Intel Commun & Devices Grp, D-85579 Neubiberg, Germany
[4] Natl Univ Sci & Technol, Sch Elect Engn & Comp Sci, Islamabad 44000, Pakistan
[5] Mem Univ, Fac Engn & Appl Sci, Elect & Comp Engn Dept, St John, NF A1B 3C5, Canada