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10-GHz timing extraction from a 20-Gbit/s optical data stream by using a newly proposed optical phase-locked loop

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Abstract

With the goal of constructing future ultrahigh-speed optical- fiber communication systems, efforts are being made to increase transmission capacity dramatically through the use of optical time-division-multi/demultiplexing (OTDM) techniques.1-3 The application of all-optical signal processing1,2 to OTDM is especially promising because it allows full exploitation of the ultrafast response produced by the optical third- order nonlinear effect.4 Among the various elements of all- optical signal processing, timing extraction1,5 is especially important because an extracted clock controls the entire all-optical signal-processing operation. In the timing extraction for the OTDM systems, it is required both to get the base-rate clock, which is essential for demultiplexing, and to operate at a multiplexed data rate. In this paper we propose a new optical phase-locked-loop (PLL) configuration that uses four-wave mixing (FWM) in a fiber as a phase detector. This PLL generates a 10-GHz electrical clock (base-rate dock) by detecting the phase of a 20-Gbit/s OTDM data stream at 20 GHz. Experimentally, we demonstrate 20-Gbit/s 105-km optical-fiber transmission with the PLL.

© 1994 Optical Society of America

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