Nonlinearities in the transfer function of an active device ( such as vacuum tubes, transistors, and operational amplifiers ) are a common source of non-linear distortion; in passive propagation path.
12.
Recent publications also compensated for non-linear distortions . " Berenguer et al " models the Mach-Zehnder modulator as an independent Cross-correlating in-phase and quadrature fields identifies the timing skew.
13.
J . C . Simon, P . DOUSSIERE, P . LAMOULER, I . VALIENTE and F . RIOU, " Travelling wave semiconductor optical amplifier with reduced non-linear distortions ", Electronics Letters, vol . 30, n?1, 1994, pp . 49 50.
