Abstract
Nonlinear polarization fluctuation (NPF) induced by cross-phase modulation may severely limit the performance of wavelength-division-multiplexing (WDM) systems that employ polarization-dependent devices. In this letter, we experimentally investigate and compare the system degradation due to NPF in 10-Gb/s WDM systems among nonreturn-to-zero (NRZ)-, return-to-zero (RZ)-on-off keying (OOK) and NRZ-, RZ-differential phase-shift keying (DPSK) modulation formats. The DPSK format, especially NRZ-DPSK, shows significant enhancement in input power dynamic range over the OOK format.
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