Stochastic resonance of bias signal-modulated noise in a single-mode laser
Wang Jun (王俊)ac, Cao Li (曹力)abc, Wu Da-Jin (吴大进)bc
a State Key Laboratory of Laser Technology, Huazhong University of Science and Technology, Wuhan 430074, Chinab Chinese Centre of Advanced Science and Technology (World Laboratory), Beijing 100080, China; c Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract Stochastic resonance (SR) for bias signal modulation is studied in a single-mode laser system. By investigating a gain-noise model driven by correlated pump noise and quantum noise, we find that, whether the correlation coefficient between both the noises is positive or negative, SR always appears in the dependence of signal-to-noise ratio (SNR) upon the noise correlation time and the frequency of the modulation signal. However, only when the correlation coefficient between both noises is negative can SR occur in the dependence of SNR upon the quantum noise intensity and pump noise intensity, while when the correlation coefficient between both noises is positive, it shows monotonically.
Received: 01 August 2003
Revised: 13 April 2004
Accepted manuscript online:
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