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Dispersion Compensation Schemes – A System Perspective

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Dispersion Compensation Schemes – A System Perspective

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we will show how dispersion compensation schemes affect the system performance. The pulse broadening effect of chromatic dispersion causes the signals in the adjacent bit periods to overlap. This is called intersymbol interference (ISI). Broadening is a function of distance as well as dispersion parameter D. The dispersion parameter is given in ps/nm/km and changes from fiber to fiber. It is also a function of wavelength. D is usually about 17 ps/nm/km in the 1.55 μm wavelength range for a standard single mode fiber (SMF). It is at a maximum of 3.3 ps/nm/km in the same window for a dispersion-shifted fiber (DSF). Nonzero dispersion fiber (NDF) has a chromatic dispersion between 1 and 6 ps/nm/km or -1 and -6 ps/nm/km.

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