Effects of Nonlinearity and Polarization Mode Dispersion on High Bit- rate Fiber-optic Communication Links
نویسندگان
چکیده
We study the performance of a typical fiber-optic communication link operating at 10 Gbps, comprising of multiple spans of standard single mode fiber (SSMF), in-line amplifiers and dispersion compensating fibers (DCF). The effects of attenuation, chromatic dispersion, nonlinearity and polarization mode dispersion (PMD) are taken into account. By numerically solving the non-linear Schrodinger equation (NLSE) using the split-step Fourier method and analyzing the system performance by generating eye-patterns at the output, we show that nonlinear effects can be reduced by choosing an appropriate state of polarization (SOP) of the input signal. When PMD can be neglected, a circular SOP leads to a lesser eye-closure as compared to a linear one and thus an improvement in performance. However when a finite PMD is considered, this improvement vanishes. This method for reducing nonlinear effects could find applications in devices employing short lengths of fiber where the effects of PMD are negligible.
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