Quality Metrics in optical modulation analysis: EVM and its relation to Q-factor, OSNR, and BER

2012 Asia Communications and Photonics Conference (ACP) Pub Date : 2012-11-07 DOI:10.1364/ACPC.2012.AF3G.2

B. Nebendahl, R. Schmogrow, T. Dennis, A. Josten, D. Hillerkuss, S. Koenig, J. Meyer, M. Dreschmann, M. Winter, M. Huebner, W. Freude, C. Koos, J. Leuthold

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引用次数: 15

Abstract

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

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光调制分析中的质量度量:EVM及其与q因子、OSNR和BER的关系

光信号的质量是光通信中一个非常重要的参数。常用的指标有几个，如光信噪比(OSNR)、q因子、误差矢量幅度(EVM)和误码率(BER)。如果导致误差的噪声统计未知，则测量的原始误码率不一定对预测软判决前向纠错(FEC)后的最终误码率有用。在这方面，EVM更优越，因为它允许对误差统计量进行估计。我们通过模拟和实验对各种指标进行分析比较。我们采用六种正交调幅(QAM)格式，符号速率分别为20 GBd和25 GBd。这些信号是由一个软件定义的发射器产生的。我们得出结论，对于具有加性高斯噪声的光通道，EVM度量是一种可靠的质量度量。对于非数据辅助QAM接收，误码率在10-6…从测量的EVM可以可靠地估计出10-2。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2012 Asia Communications and Photonics Conference (ACP)

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