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Springer eBooks

Photocurrent Noise Suppression and Optical Amplification in Negative-Feedback Opto-Electronic Loop

Anatoly Viktorovich Masalov, A. A. Putilin, Michael Vasilyev

Published Jan 1, 1995• 2 citations
Publisher
DOI
10.1007/978-1-4899-1391-3_51

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Suppression of in-loop photocurrent fluctuation below the amplifier dark noise was observed in both a negative-feedback light-emitting diode (LED) and a laser diode (LD). We use a new semiclassical model to analyze the squeezed mechanism of the in-loop photocurrent noise mentioned above and find that there is a feedback-measurement–induced anticorrelation effect between the measured photocurrent fluctuation and the amplifier dark noise, which results in the suppression of the in-loop photocurrent fluctuation below the amplifier dark noise. Our theoretical analysis gives the correlation coefficient between the photocurrent fluctuation and amplifier noise, and also yields the squeezed spectrum of the in-loop intensity fluctuation according to our experimental results.
Suppression of the closed-loop photocurrent fluctuation below the amplifier dark noise was observed in both a negative-feedback light-emitting diode and a laser diode. We apply the concept of an anticorrelation light state proposed by Masalov et al to analyze the anticorrelation effect between the measured photocurrent fluctuation and the amplifier dark noise, which successfully explains our experimental observations. Our theoretical analysis also yields the squeezed spectrum of the light intensity fluctuation in the loop and the correlation coefficient between the photocurrent and the amplifier noise.