Abstract
We experimentally investigate the real transparency of four-wave mixing
(FWM) in semiconductor optical amplifiers to modulation formats involving
intensity, phase, and polarization multiplexing. We exploit two different
FWM polarization-independent schemes (that make use of two pumps) to wavelength-convert
40 Gb/s single-polarization and 80 Gb/s polarization-multiplexed signals in
case of both nonreturn-to-zero ${ON}$–${OFF}$ keying (NRZ-OOK) and NRZ differential phase-shift keying modulation
formats. We found that, although FWM conversion is transparent to modulation
formats employing phase and intensity, polarization-multiplexed signals pose
serious limitations to all-optical processing transparency.
© 2009 IEEE
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