Abstract
In order to explore the potential of optical multilevel
signaling for high-speed optical fiber networks, an incoherent 50Gbit/s
32-level optical multilevel signaling (combination of QASK and 8-DPSK) is
demonstrated, for the first time. The application of an ISI-suppressed modulation
technique, an orthogonally-coupled differential detection technique and the
digital signal processing technique have also been proposed and verified to
enhance the performance of multilevel signaling. A 100-km dispersion shifted
fiber transmission has also been performed, and the degradation via optical
fiber nonlinear effect, self-phase modulation (SPM), is observed. The receiver
side simple digital cancellation technique of the SPM-induced phase shift
is also proposed and experimentally demonstrated with more than 6.8dB
increase of fiber input power.
© 2008 IEEE
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