We consider interaction of polarization-mode dispersion (PMD), Kerr-nonlinearities and chromatic dispersion and its effect on the quality of WDM-transmission in a fiber link. We simulate the propagation of RZ- and NRZ-coded signals in a multispan link with optical amplification and chromatic dispersion compensation. For some fiber realizations signal impairments reduction occurs in the case of PMD and nonlinearities interaction as compared to the case of nonlinear transmission with no PMD. This signal enhancement is related to the pulse compression and this phenomenon is determined by the frequency dependence of PMD.
We propose a method intended for reconstructing a fiber propagation matrix in few-mode regime and determination of the corresponding principal modes. The method is based on the idea of extending the Jones Matrix Eigenanalysis (JME) technique, which provides.the determination of both the propagation matrix and the principal states of polarization in a single-mode fiber, to the basis of spatial modes in a few-mode fiber. We propose that a multibranch diffractive optical element should be used as a correlation filter, which can be implemented by means of a spatial light modulator (SLM). The efficiency of the proposed method is numerically verified for a stepped-index few-mode fiber in the strong coupling regime.
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