Abstract
All-optical wavelength conversion of differential phase-shift keyed (DPSK)
signals based on semiconductor optical amplifier Mach–Zehnder
interferometer (SOA-MZI) is simulated and analyzed. The results show that,
to obtain both good quality of the converted signal and high conversion
efficiency, phase difference between the upper and lower arms of MZI should
be near $\pi$, which suggests strong cross-phase-modulation (XPM) and
cross-gain-modulation (XGM) for optimized operation of this wavelength
converter, while weak XPM and XGM will lead to sacrifice of conversion
efficiency. The results also show larger wavelength up-conversion range, and
suggest non-return-to-zero (NRZ) format for 10 Gb/s operation while
return-to-zero (RZ) format for 40 Gb/s operation. Besides, short carrier
lifetime is preferred for high-speed applications and appropriate linewidth
enhancement factor can be utilized to mitigate amplitude fluctuation of the
converted signal if the carrier lifetime is not short enough.
© 2009 IEEE
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