Numerical analysis for four-wave mixing based wavelength conversion of differential phase-shift keying signals

We numerically investigate the main constrains for high efficiency wavelength conversion of differential phase-shift keying (DPSK) signals based on four-wave mixing (FWM) in highly nonlinear fiber (HNLF). Using multi-tone pump phase modulation techniques, high efficiency wavelength conversion of DPSK signals is achieved with the stimulated Brillouin scattering (SBS) effects effectively suppressed. Our analysis shows that there is a compromise between conversion efficiency and converted idler degradation. By optimizing the pump phase modulation configuration, the converted DPSK idler's degradation can be dramatically decreased through balancing SBS suppression and pump phase modulation degradation. Our simulation results also show that these multi-tone pump phase modulation techniques are more appropriate for the future high bit rate systems.

National "863"' Program of China 2006AA01Z253 2006AA01Z261 National Natural Science Foundation of China 60877045 60736003Ministy of Education of China Alexander von Humboldt Foundation This work was supported by the National "863"' Program of China (Nos. 2006AA01Z253 and 2006AA01Z261) the National Natural Science Foundation of China (Nos. 60877045 and 60736003) the Scientific Research Foundation for the Returned Overseas Chinese Scholars form the Ministy of Education of China. F. Zhang acknowledges the support from Alexander von Humboldt Foundation.