These are the first five reflected peaks.  The input pulse is not shown as the scaling it requires makes the forth and fifth peaks hardly noticeable.   Notice that each progressive  peak is of lesser amplitude and broader half-width than its preceding peaks. 

Each progressive peak appears broader due to a quantum mechanical phenomenon.  Understanding the time-evolution of the pulse requires an understanding that different frequencies travel at different speeds.  The cable is long enough that a trip down and back allows the pulse to evolve noticeably.  During its trip, the slower frequencies lag behind the faster ones, thus the pulse spreads.