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星尘2516木虫 (小有名气)
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[求助]
如何测量激光器的相对噪声强度？ 已有1人参与
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| 如题，现在想用频谱仪测量一个半导体激光器的相对噪声强度，应该如何测量呢？激光器是CW的，非脉冲的。 |
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sailbxl
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【答案】应助回帖
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Relative intensity noise is measured by sampling the output current of a photodetector over time and transforming this data set into frequency with a fast Fourier transform. Alternatively, it can be measured by analyzing the spectrum of the photodetected signal using an electrical spectrum analyzer. Noise observed in the electrical domain is proportional to electric current squared and hence to optical power squared. Therefore, RIN is usually presented as relative fluctuation in the square of the optical power in decibels per hertz over the RIN bandwidth and at one or several optical intensities. It may also be specified as a percentage, a value that represents the relative fluctuations per Hz multiplied by the RIN bandwidth. 摘自维基百科，基本上就是用一个PD+频谱仪。 |
2楼2016-11-16 15:27:46