Abstract
All-optical pulse reamplification, reshaping (2R), and retiming (3R)
using a monolithic bistable semiconductor ring laser (SRL) is demonstrated
for the first time. The regeneration performance of the SRL is characterized
with an all-optical settable switching threshold, achieving significant increases
in the extinction ratio (ER) of the output pulse for input ER as low as 1
dB. For retiming, a rectangular retiming window generated by a clean clock
signal is used to eliminate the timing jitter in the input pulse. For input
pulse with peak-to-peak timing jitter as high as $\sim {\hbox {12}}\%$ of the bit period,
the timing jitter in the retimed output pulse is reduced to $ < 2\%$ of the bit period. The pulsewidth
of the final regenerated data can be controlled by changing the width of the
retiming window. The SRL is, therefore, shown to have a “hard”
digital performance in both amplitude and time domain suitable for all-optical
3R.
© 2009 IEEE
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