70-Gb/s amplitude-shift-keyed system with 10-GHz clock recovery circuit using duty cycle division multiplexing. - Ghafour Amouzad Mahdiraji; Mohamad Khazani Abdullah; Makhfudzah Mokhtar; Amin Malek Mohammadi; Ahmad Fauzi Abas; Safuraa Mohd Basir; Raja Syamsul Azmir Raja Abdullah (Photonic Netw. Commun., 2010)