Abstract
AbstractIn this paper, we present a scheme for recovering 1 0GHz clock from 40Gb/s and 80 Gb/s time division multiplexed (TDM) return to zero (RZ) data stream. Theproposed clock recovery is successfully demonstrated using an electrical phase locked ioop (PLL). The jitter of the recovered clock is estimated to be around 5Ofs. The key part in the proposed clock recovery circuit is a LiNbO3 Mach-Zehndermodulator which is shown to be highly effective in optical to electrical down conversion. Keywords: High speed transmission, LiNbO3 modulator, Clock recovery IntroductionThe continuing demand for higher data transmission capacity will fuel the need for higher speed optical transmission system than that installed today. Systems operating at single channel speeds of 1 0Gb/s are currently being deployed. For time division multiplexed (TDM) systems, signals at low data rate are multiplexed tocreate data at a higher rate. At the receiver end, the received optical TDM pulsetrain is then demultiplexed into each lower data rate channel using varioustechniques like nonlinear optical loop mirror (NOLM) [1] and semiconductoroptical amplifier (SOA) [2] .
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