Optical EngineeringEffects of fiber impairments on constellation diagrams of optical phase modulated signals
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The effects of chromatic dispersion (CD) and first order polarization mode dispersion (PMD) on constellation diagrams of phase modulated signals are investigated via simulation and different methods to visualize these effects are presented. It is shown that constellation diagrams of (D)QPSK signals sampled by an asynchronous receiver can be used to simultaneously monitor CD and first order PMD. The amount of accumulated impairments can be estimated by quantifying certain deformations in patterns of constellation diagrams.