Characterization of semiconductor-laser phase noise and estimation of bit-error rate performance with low-speed offline digital coherent receivers
Characterization of semiconductor-laser phase noise and estimation of bit-error rate performance with low-speed offline digital coherent receivers
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DOI：
10.1364/oe.20.005291
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发表时间：
2012-02-27
期刊：
影响因子：
3.8
通讯作者：
Kikuchi, Kazuro
中科院分区：
文献类型：
--
作者：
Kikuchi, Kazuro
我们开发了一种使用低速离线数字相干接收机来表征半导体激光相位噪声的系统方法。用这种接收机测量的场频谱、调频噪声频谱和相位误差方差能够完整地描述被测激光器的相位噪声特性。数字相干接收机的采样率应远高于相位波动速度。然而，对于大多数单模半导体激光器来说，1 GS/s就足够高了。除了这种相位噪声表征之外，将1.25 GS/s采集的数据进行插值以形成10 GS/s的数据流，我们可以预测10 G符号/秒的多级调制光信号的误码率（BER）性能。相位噪声测量结果很好地解释了由于相位噪声导致的误码率下降。（C）2012美国光学学会
We develop a systematic method for characterizing semiconductor-laser phase noise, using a low-speed offline digital coherent receiver. The field spectrum, the FM-noise spectrum, and the phase-error variance measured with such a receiver can completely describe phase-noise characteristics of lasers under test. The sampling rate of the digital coherent receiver should be much higher than the phase-fluctuation speed. However, 1 GS/s is large enough for most of the single-mode semiconductor lasers. In addition to such phase-noise characterization, interpolating the taken data at 1.25 GS/s to form a data stream at 10 GS/s, we can predict the bit-error rate (BER) performance of multi-level modulated optical signals at 10 Gsymbol/s. The BER degradation due to the phase noise is well explained by the result of the phase-noise measurements. (C) 2012 Optical Society of America