TAILIEUCHUNG - Optical Networks: A Practical Perspective - Part 38

Optical Networks: A Practical Perspective - Part 38. This book describes a revolution within a revolution, the opening up of the capacity of the now-familiar optical fiber to carry more messages, handle a wider variety of transmission types, and provide improved reliabilities and ease of use. In many places where fiber has been installed simply as a better form of copper, even the gigabit capacities that result have not proved adequate to keep up with the demand. The inborn human voracity for more and more bandwidth, plus the growing realization that there are other flexibilities to be had by imaginative use of the fiber, have led people. | 340 Transmission System Engineering Figure Typical contours of constant BER for a DM soliton and an NRZ modulated 10 Gb s system. After NakOO . Another important factor influencing the performance of DM soliton systems is the peak-to-peak variation of the chromatic dispersion from the average over the span. In Figure the peak-to-peak variation was chosen to be small ps nm-km and thus both the anomalous and normal segments had very low chromatic dispersion. However the achievable regeneration-free transmission distance is quite sensitive to the excess chromatic dispersion relative to the average chromatic dispersion on the span because of the delicate balancing of the chromatic dispersion against the nonlinearities in the fiber that occurs for soliton-like pulses. Figure plots the maximum distance between regenerators as a function of the excess anomalous chromatic dispersion on the span while maintaining a fixed value of the average chromatic dispersion for DM solitons as well as NRZ and unchirped RZ systems. The excess anomalous chromatic dispersion is the excess of the chromatic dispersion in the anomalous segment over and above the average chromatic dispersion on the link as indicated in Figure . Here we assume that the 80 km spans consist of a 50 km anomalous segment and a 30 km normal segment. The NRZ and RZ systems are assumed to be fully dispersion compensated so that the average chromatic dispersion on these spans is zero. For the DM soliton system the average chromatic dispersion is ps nm-km which is slightly anomalous. Since the average chromatic dispersion is zero for the NRZ and RZ systems and quite small in the DM soliton case the abscissa in Figure is effectively the chromatic dispersion of the anomalous segment. Note from Figure that the NRZ system is not sensitive to the excess local chromatic dispersion. This is because the NRZ system essentially operates in the Overall Design Considerations 341 DM soliton

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