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Km) 15 = 15 10 20 Plate 1 Simulation results of power penalty contours (indicatedin dB by bar on right) for percent per-span compensation versus fiber dispersion for a 40 Gbps DWDM system for two-channel power and precompensation levels. 5 channels, 200 GHz spaced NRZ, 6 x 80 km system. Curves indicate dispersion and compensation ratios across C-band channels (from 1530 to 1565nm) using a high-slope DCF for large-area (dashed), low-slope (solid), and large-dispersion (solid orange) NZDF. Reprinted with permission from Ref.

Since the RSF has a smaller 0 50 100 150 Distance (krn) 200 250 300 Fig. ~~ 34 David J. DiGiovanni et al. mode field than the LMF, it is used in a position where the P,h has been attenuated due to loss and therefore will not generate significant nonlinear crosstalk. After several amplifier spans, SMF is used to dispersion compensate the previous LMF RSF spans. An advantage of using SMF as the compensating fiber is that it can also be used as part of the transmission span. In terrestrial applications, the DCF is normally lumped at the amplifier site.

By carefully analyzing how the above requirements translate to different fiber designs, one can identify optimum fiber choices. Sometimes conflicting requirements may not be handled adequately by any one fiber type. In such case, a widely practiced hybrid cabling solution which incorporates two fiber types within a single cable can be quite cost effective. 3. , MetroCorTM. All fibers may be broadly categorized on the basis of their dispersion and loss, shown respectively in Fig. 16 and Fig. 17.

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