Title :
Experimental Comparison of Different BER Estimation Methods for Coherent Optical QPSK Transmission Systems
Author :
Zhang, Fan ; Luo, Yazhi ; Wang, Yandan ; Li, Li ; Zhu, Lixin ; Chen, Zhangyuan ; Wu, Chengbin
Author_Institution :
State Key Lab. of Adv. Opt. Commun. Syst. & Networks, Peking Univ., Beijing, China
Abstract :
We experimentally compare several bit-error-rate (BER) estimation approaches in a 10-Gbaud coherent optical nonreturn-to-zero quadrature-phase-shift-keying (NRZ-QPSK) system. The probability density function (pdf) fitting via the generalized exponential function offers the most reliable estimation of the system performance, which agrees well with the error counting measurement. We also propose a novel definition of Q -factor applicable to QPSK constellations, which is more credible compared to the error vector magnitude (EVM).
Keywords :
Q-factor; error statistics; optical communication; probability; quadrature phase shift keying; 10-Gbaud coherent optical nonreturn-to-zero quadrature-phase-shift-keying system; BER estimation method; EVM; Q-factor; bit-error-rate estimation method; coherent optical QPSK transmission system; error counting measurement; error vector magnitude; probability density function fitting; Adaptive optics; Bit error rate; Estimation; Fiber optics; Optical attenuators; Phase shift keying; Q factor; Bit-error rate (BER); coherent detection; optical communication; quadrature-phase-shift-keying (QPSK);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2160718
