In-Fiber Subpicosecond Pulse Shaping for Nonlinear Optical Telecommunication Data Processing at 640 Gbit/s

Figure 3

Amplitude and phase characteristics of the fiber LPG filters. Measured field amplitude and phase characteristics of the realized long, S3 (red) and short S1 (blue) LPGs together with the theoretical characteristics of an ideal differentiator similar to S3 (green, dash-dotted lines). The S3 and S1 LPG operational bandwidths (highlighted in the figure) are 5.5 nm and 19 nm, respectively. The inset shows a fiber uniform LPG, where the level of green corresponds to the refractive index.