A novel optical phase-locked loop (PLL), which utilizes four wave mixing in a fiber as a phase detector, is proposed to track a data rate clock in an optically time-division-multiplexed (TDM) data stream, and to generate a prescaled electric clock directly. An optical TDM 20 Gb/s-105 km transmission experiment has been successfully performed with the optical PLL.
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Agrawal GP., 2019, NONLINEAR FIBER OPTI, DOI 10.1016/C2018-0-01168-8