Spectral overlapping due to interferences
Four modulated carriers travel through a common non-linear amplifier. One is a 16 QAM / 10 Mbauds, the three others are 4PSK / 2.5 MBauds. The graph shows the spectral power density at the amplifier output (at the amplifier input, the four spectra do not interleave)..
Other examples : Fresnel plan Eye diagram Group delay of a
feeder Group delay of a filter
Bit Error Rate Multicarrier amplification
Constellation Differential gain