Abstract
The authors report on a novel application of a $\chi^{(2)}$ nonlinear optical device
as an ultrafast phase comparator, an essential element that allows an optoelectronic
phase-locked loop to perform clock recovery of ultrahigh-speed optical time-division
multiplexed (OTDM) signals. Particular interest is devoted to a quasi-phase-matching
adhered-ridge-waveguide periodically poled lithium niobate (PPLN) device,
which shows a sufficient high temporal resolution to resolve a 640 Gbits OTDM
signal.
© 2009 IEEE
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