with a 3-dB bandwidth of 50 GHz and then observed
on a digital sampling oscilloscope. Figure 6 shows the
10-GHz pulse waveforms before and after the SPMbased
reshaping stage. Comparison of before and after
waveforms shows the effectiveness of the SPM-based
reshaping stage with the waveforms in Fig. 6a and Fig.
6b almost the same except for the small difference
marked by the arrows. Before the SPM-based reshapings
the left pulse edge rises slowly; however, after the
SPM-based reshaping the left edge has an obvious knee
point. The difference in the waveforms is attributed to
the pedestal removal by the SPM-based reshaping.