Abstract
In long-distance and high-speed wavelength-division multiplexed (WDM) systems, fiber dispersion and nonlinearities degrade system performance and limit the distance and speed of data transmission. The most important nonlinear effects include stimulated Raman scattering, four-wave mixing (FWM) and self- and cross-phase modulation (SPM/CPM). Various dispersion-management techniques have been successfully used to simultaneously minimize dispersion and negate FWM effects.1 These techniques typically utilize different types of fiber so that the dispersion alternates between positive and negative values along the link. With these methods: (i) FWM is eliminated because an absolute non-zero dispersion always exists along the link, but (ii) the total dispersion does not significantly accumulate during propagation.2,3 However, the dispersion-managed transmission system will still be limited due to residual effects. We analyze the transmission degradations due to fiber dispersion and SPM/CPM for dispersion-managed WDM systems at 5, 10, and 20 Gbit/s. We find that: (i) crossphase modulation is the major degrading effect in 5-Gbit/s transmission, (ii) both cross-phase modulation and dispersion degrade the system performance in 10-Gbit/s transmission, and (iii) fiber dispersion is the key degrading effect in 20Gbit/s transmission.
© 1996 Optical Society of America
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