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A novel all-optical wavelength converter for nonreturn-to-zero systems based on a nonlinear polarization switch (NPS) and a delayed interferometer (DI) is proposed and demonstrated experimentally. The performance of the proposed wavelength converter is compared with the performance of a conventional wavelength converter that only incorporates a NPS. Results show that the quality of the converted signal is significantly improved by inserting a DI after the NPS. The transmission performance of the wavelength-converted signal is also improved by the DI. © 2010 Society of Photo-Optical Instrumentation Engineers.

All-optical wavelength conversion of nonreturn-to-zero signals based on a nonlinear polarization switch and a delayed interferometer