Abstract
By using a semiconductor optical amplifier backward injected by a dark-optical-comb pulse train at , we demonstrate a all-optical nonreturn-to-zero (NRZ) to return-to-zero (RZ) format conversion of an incoming optical pseudorandom binary sequence (PRBS) data strieam. Both the polarity and the wavelength of data are conserved during format conversion. Without any preamplification, the extinction ratio of degraded optical NRZ PRBS data is greatly improved from 7.13 to after NRZ-to-RZ conversion. An ultralow bit-error rate of at a data rate as high as is obtained with a received optical power of . The converted RZ PRBS data exhibit a negative power penalty of compared with the NRZ PRBS data at a bit-error rate of .
© 2006 Optical Society of America
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