We report a theoretical and experimental study of the excess photocurrent noise in the detection of low-coherence radiation caused by the beats of the random components of the optical spectrum at equal intensities in the interferometer arms. It is shown that, in this case, the spectral density of photocurrent fluctuations is times higher than when detecting radiation without interference. This result makes it possible to clarify the value of the limiting level of the total fundamental noise of low-coherence radiation during interference. Excess noise cannot be completely subtracted in balanced detection.

中文翻译：

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干涉仪臂中等强度的过量宽带噪声

我们报告了在干涉仪臂中以相等强度的光谱随机分量拍拍引起的低相干辐射检测中过量光电流噪声的理论和实验研究。结果表明，在这种情况下，光电流波动的光谱密度比在没有干扰的情况下检测辐射时高出数倍。该结果可以明确干扰期间低相干辐射的总基波噪声的限制电平值。在平衡检测中不能完全减去多余的噪声。