Abstract

By using a semiconductor optical amplifier backward injected by a dark-optical-comb pulse train at 10GHz, we demonstrate a 10Gbits 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 13.6dB after NRZ-to-RZ conversion. An ultralow bit-error rate of 1012 at a data rate as high as 10Gbitss is obtained with a received optical power of 18.3dBm. The converted RZ PRBS data exhibit a negative power penalty of >3.7dB compared with the NRZ PRBS data at a bit-error rate of 1012.

© 2006 Optical Society of America

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