
Figure 15.20(b) is also a W-profile. By reducing the core delta from 1.8 to 0.8%,
the dispersion is decreased by about 16 ps/nm/km. Unlike the case of fiber
diameter change, the effective area increases with decreasing dispersion. One
advantage of changing the core delta is that SBS effects can be reduced, while
changing the core diameter has very little impact on SBS.
15.4.3 Typical Fiber Performance
Silica-based nonlinear fibers can be manufactured by different manufacturing
processes such as OVD, MCVD, and PCVD. For nonlinear fibers made by the
OVD process, typical fiber performance is listed in Table 15.3. It can be seen that
the effective area