Stochastic resonance in a gain--noise model of a single-mode laser driven by pump noise and quantum noise with cross-correlation between real and imaginary parts under direct signal modulation
Chen Li-Mei(陈黎梅)a)b) † , Cao Li(曹力)b)d), and Wu Da-Jin(吴大进)c)d)
a Department of Physics, Shenzhen University, Shenzhen 518057, China; b State Key Laboratory of Laser Technology, Huazhong University of Science and Technology, Wuhan 430074, China; c Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, Chinad China Centre of Advanced Science and Technology (World Laboratory), Beijing 100080, China
Abstract Stochastic resonance (SR) is studied in a gain--noise model of a single-mode laser driven by a coloured pump noise and a quantum noise with cross-correlation between real and imaginary parts under a direct signal modulation. By using a linear approximation method, we find that the SR appears during the variation of signal-to-noise ratio (SNR) separately with the pump noise self-correlation time $\tau$, the noise correlation coefficient between the real part and the imaginary part of the quantum noise $\lambda$q , the attenuation coefficient $\gamma$ and the deterministic steady-state intensity $I_0$ . In addition, it is found that the SR can be characterized not only by the dependence of SNR on the noise variables of $\tau$ and $\lambda$q, but also by the dependence of SNR on the laser system variables of $\gamma$ and I0. Thus our investigation extends the characteristic quantity of SR proposed before.
Received: 27 February 2006
Revised: 26 July 2006
Accepted manuscript online:
PACS:
42.60.Lh
(Efficiency, stability, gain, and other operational parameters)
Fund: Project supported by the National Natural Science Foundation of
China (Grant No 10275025).
Cite this article:
Chen Li-Mei(陈黎梅), Cao Li(曹力), and Wu Da-Jin(吴大进) Stochastic resonance in a gain--noise model of a single-mode laser driven by pump noise and quantum noise with cross-correlation between real and imaginary parts under direct signal modulation 2007 Chinese Physics 16 123
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