  This paper analyzes the behaviors of solitons in even higher-order dispersive
media and explores the modulational instability phenomenon in optical media.
The analysis considers quadratic, quartic, and sextic dispersions with weakly
nonlocal Kerr nonlinearity. The results show that nonlocality enhances the MI
gain and leads to rogue waves in response to different combinations of even
dispersions and nonlocal nonlinearity. The study suggests that Kerr nonlocality
can enhance the excitation of extreme events in even higher-order dispersive
nonlinear media with potential applications in optical fibers and fiber lasers.
