Abstract
Optical pulse replicators generate multiple replicas of an optical waveform
that are averaged to increase the signal-to-noise ratio of single-shot, high-bandwidth
temporal measurements. Processing a replicated waveform requires that the
delayed realizations of the waveform under test be retimed properly before
averaging. Delay miscalibration significantly reduces the measurement bandwidth.
Processing algorithms based on edge alignment, centroid matching, and minimization
of the distance between replicas decrease the impact of the detrimental bandwidth
reduction, and a global distance minimization, simultaneously taking into
account the distance between all pairs of retimed replicas, has the best performance,
even in the presence of significant measurement noise. The general impact
of chromatic dispersion on the averaged waveform is derived in the framework
of the temporal transport-of-intensity equation, and the measurement error
is quantified for various optical signals.
© 2013 USGov
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