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ACTA PHOTONICA SINICA

Evolution of the Intensity Correlation Function in a Single-mode Laser with a Biased Amplitude Modulation

叶庆 叶庆

Published Jan 1, 2014• 0 citations
Publisher
DOI
10.3788/gzxb20144311.1114001

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Evolution of the Intensity Correlation Function in a Single-mode Laser with a Biased Amplitude Modulation

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By using the linear approximation method,the intensity correlation function C(t)of loss model laser system with a biased amplitude modulation was calculated.The different forms(irregularly periodic increasing,decreasing and so on)were obtained in the evolution of the intensity correlation function C(t)with the time t.The results indicate that:in the case of a0=0.1,the flat irregularly periodic oscillation is shown;the period of irregularly periodic oscillation is adjusted by the low frequencyΩof modulation signal;the initial value and the period of C(t)can be changed by the intensity of quantum noise Qand the high frequencyωof carrier signal.

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By using the linear approximation method,the intensity correlation function C(t)of loss model laser system with a biased amplitude modulation was calculated.The different forms(irregularly periodic increasing,decreasing and so on)were obtained in the evolution of the intensity correlation function C(t)with the time t.The results indicate that:in the case of a0=0.1,the flat irregularly periodic oscillation is shown;the period of irregularly periodic oscillation is adjusted by the low frequencyΩof modulation signal;the initial value and the period of C(t)can be changed by the intensity of quantum noise Qand the high frequencyωof carrier signal.
In the case of the cross-correlation intensity of noises being modulated by time period,the intensity correlation function of the single-mode laser system was presented in terms of the linear approximation method.The evolution of intensity correlation function with the time and find the periodic oscillation of the intensity correlation function was investigated.The results show that oscillation amplitude and period of the intensity correlation function do not vary with the quantum noise intensity,pump noise intensity and cross-correlation intensity.The input signal frequency can change the oscillation amplitude and period of the intensity correlation function,but not change the equilibrium site of the oscillation.The quantum noise intensity can change the position of the oscillation extremum.The parameters can all change the initial decay value of the intensity correlation function,while the intensity correlation function is not sensitive to the time period modulation frequency.
By using the linear approximation method, the intensity correlation function is calculated for a single-mode laser modulated by a bias signal and driven by colored pump and quantum noises with colored cross-correlation. We found that, when the correlation time between the two noises is very short, the behavior of the intensity correlation function versus the time, in addition to decreasing monotonously, also exhibits several cases, such as one maximum, one minimum, and two extrema. When the correlation time between the two noises is very long, the behavior of the intensity correlation function exhibits oscillation and the envelope is similar to the case of short cross-correlation time.