中国物理B ›› 2007, Vol. 16 ›› Issue (1): 123-129.doi: 10.1088/1009-1963/16/1/022

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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

吴大进1, 陈黎梅2, 曹力3   

  1. (1)Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, China; China Centre of Advanced Science and Technology (World Laboratory),Beijing 100080, China ; (2)Department of Physics, Shenzhen University, Shenzhen 518057, China; State Key Laboratory of Laser Technology, Huazhong University of Science and Technology, Wuhan 430074, China; ; (3)State Key Laboratory of Laser Technology, Huazhong University of Science and Technology, Wuhan 430074, China; China Centre of Adv
  • 收稿日期:2006-02-27 修回日期:2006-07-26 出版日期:2007-02-01 发布日期:2007-02-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10275025).

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)   

  1. 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
  • Received:2006-02-27 Revised:2006-07-26 Online:2007-02-01 Published:2007-02-01
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10275025).

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摘要： 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 \lambdaq , 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 \lambdaq, 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.

关键词: stochastic resonance, direct modulation signal, quantum noise with cross-correlation between real and imaginary part, linear approximation method

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.

Key words: stochastic resonance, direct modulation signal, quantum noise with cross-correlation between real and imaginary part, linear approximation method

中图分类号:  (Efficiency, stability, gain, and other operational parameters)

  • 42.60.Lh
05.40.Ca (Noise) 42.50.Lc (Quantum fluctuations, quantum noise, and quantum jumps) 42.60.Fc (Modulation, tuning, and mode locking)