A dc-voltage-controlled optoelectronic delay line for continuous tuning of the relative delay time of an optical pulse train generated from a gain-switched laser diode is demonstrated. A maximum tunable range delay time of 3.9 ns ( periods) for optical pulses at a 500-MHz repetition rate is reported, which corresponds to a phase shift of as much as . The tuning responsivity and resolution of the current apparatus are and , respectively. The measured timing fluctuation and long-term drift at any delay time are 0.13 ps and , respectively. This scheme further permits the simultaneous phase tracking of the laser pulse train to unknown signals generated from the device under test.
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Gong-Ru Lin and Yung-Cheng Chang
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