Experimental study of the statistical properties of nonlinearly amplified signals in semiconductor optical amplifiers
Experimental study of the statistical properties of nonlinearly amplified signals in semiconductor optical amplifiers
复制标题
半导体光放大器非线性放大信号统计特性的实验研究
DOI：
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发表时间：
1997
影响因子：
2.6
通讯作者：
G. Eisenstein
中科院分区：
文献类型：
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作者：
M. Shtaif;G. Eisenstein
我们研究了非线性放大对放大信号的噪声特性的影响。我们表明，输出噪声统计可以近似为高斯在很宽的范围内的实际参数。此外，我们表明，非线性放大的噪声携带的信号可能会导致增强的信号噪声比（SNR）。基本原理表明，只要使用最佳检测方案，这就不能改善通信链路的误比特率性能。因此，我们得出的结论是，对于利用半导体光放大器非线性放大的通信系统，基于SNR的性能评估可能会产生误导，应该非常谨慎。
We examine the effect of nonlinear amplification on the noise properties of an amplified signal. We show that the output noise statistics can be approximated as Gaussian over a wide range of practical parameters. In addition, we show that nonlinear amplification of noise carrying signals may result in an enhancement of the signal-to-noise ratio (SNR). Basic principles dictate that this can not improve the bit error rate performance of a communication link, as long as an optimal detection scheme is used. Hence, we conclude that for communication systems that exploit nonlinear amplification in semiconductor optical amplifiers, evaluation of performance on the basis of the SNR can be misleading and should be made with great care.