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Chinese Physics, 2007, Vol. 16(1): 123-129    DOI: 10.1088/1009-1963/16/1/022
CLASSICAL AREAS OF PHENOMENOLOGY Prev   Next  

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.
Keywords:  stochastic resonance      direct modulation signal      quantum noise with cross-correlation between real and imaginary part      linear approximation method  
Received:  27 February 2006      Revised:  26 July 2006      Accepted manuscript online: 
PACS:  42.60.Lh (Efficiency, stability, gain, and other operational parameters)  
  05.40.Ca (Noise)  
  42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps)  
  42.60.Fc (Modulation, tuning, and mode locking)  
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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