Excess broadband noise at equal intensities in the interferometer arms. (May 2021)

• Record Type: Journal Article
• Authors: Gelikonov, V M; Romashov, V N; Gelikonov, G V
• Is Part Of: Quantum electronics. Volume 51:Number 5(2021)
• Page Start: 377
• Page End: 382
• Publication Date: 2021-05
• Subjects: interferometry -- radiation noise -- photocurrent fluctuations.; Quantum electronics -- Periodicals; 537.5
• DOI: 10.1070/QEL17536
• Languages: English
• ISSNs: 1063-7818

Abstract

Abstract: 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 √1.5 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.