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Title: SER estimation method for 56 GBaud PAM-4 transmission system
Authors: Raza, A
Zhong, KP 
Ghafoor, S
Iqbal, S
Adeel, M 
Habib, S
Butt, MFU
Lu, C 
Issue Date: 2018
Publisher: Chinese Optical Society
Source: Chinese optics letters, 10 Apr. 2018, v. 16, no. 4, 40604 How to cite?
Journal: Chinese optics letters 
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 SERGGD 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 P-1 and P-2 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.
EISSN: 1671-7694
DOI: 10.3788/COL201816.040604
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