Abstract
In this Letter, we have proposed a generalized Gaussian probability
density function (GGPDF)-based method to estimate the symbol error ratio
(SER) for pulse amplitude modulation (PAM-4) in an intensity
modulation/direct detection (IM/DD) system. Furthermore, a closed form
expression of SER
GGD
for PAM-4 has been derived.
The performance of the proposed method is evaluated through simulation as
well as experimental work. The fitting of probability density functions of
the received signal is applied via GGPDF and shape parameters
P1 and P2 associated with different
PAM-4 levels are determined. The optimum single value of shape parameter
P is then calculated to estimate the SER. The mathematical
relationship of P with different received optical powers and
receiver bandwidths has been determined and verified. The proposed method
is a fast and accurate method to estimate SER of a PAM-4 system, which is
more reliable and in agreement with the error counting method.
© 2018 Chinese Laser Press
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