EVM as new quality metric for optical modulation analysis
作者： B. Nebendahl , W. Freude , C. Koos , J. Leuthold , M. Huebner
DOI: 10.1109/SIECPC.2013.6551002
关键词:
摘要: The quality of optical signals is a very important parameter in communications. Several metrics are common use, like signal-to-noise power ratio (OSNR), Q-factor, error vector magnitude (EVM) and bit (BER). A measured raw BER not necessarily useful to predict the final after soft-decision forward correction (FEC), if statistics noise leading errors unknown. In this respect EVM superior, as it allows an estimation statistics. We compare various analytically, by simulation, through experiments. employ six quadrature amplitude modulation (QAM) formats at symbol rates 20 GBd 25 GBd. were generated software-defined transmitter. conclude that for channels with additive Gaussian metric reliable measure. For nondata-aided QAM reception, range 10-6-10-2 can be reliably estimated from EVM.
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