Intensity correlation time of a single-mode laser driven by two coloured noises with coloured cross-correlation with direct signal modulation

2005 ◽  
Vol 14 (4) ◽  
pp. 764-770 ◽  
Author(s):  
Chen Li-Mei ◽  
Cao Li ◽  
Wu Da-Jin ◽  
Wang Zhong-Long
Keyword(s):  
Correlation Time ◽  
Cross Correlation ◽  
Single Mode ◽  
Signal Modulation ◽  
Intensity Correlation ◽  
Direct Signal ◽  
Mode Laser ◽  
Single Mode Laser

THE VARIETIES OF INTENSITY CORRELATION TIME WITH INPUT SIGNAL IN A SINGLE-MODE LASER WITH BIAS SIGNAL MODULATION

2005 ◽  
Vol 19 (10) ◽  
pp. 1801-1813 ◽  
Author(s):  
LI-MEI CHEN ◽  
LI CAO ◽  
DA-JIN WU
Keyword(s):  
Input Signal ◽  
Correlation Time ◽  
Quantum Noise ◽  
Single Mode ◽  
Noise Model ◽  
Signal Frequency ◽  
Signal Modulation ◽  
Intensity Correlation ◽  
Mode Laser ◽  
Single Mode Laser

The varieties of intensity correlation time T with input signal are studied for gain-noise model of a single-mode laser driven by colored pump noise and colored quantum noise with colored cross-correlation with a bias signal modulation in this paper. By using the linear approximation method, it is found that a minimum (i.e. suppression) in the curves of the intensity correlation time T versus the bias current i0 exists when the noise correlation coefficient λ is negative; and the intensity correlation time T increases monotonously with the increase of i0 when λ≥0. In addition, we also analyze the curve of T versus the signal frequency Ω, find that no matter what the value of λ is, a minimum (i.e. suppression) in the T-Ω curves always exists.

THE INTENSITY CORRELATION TIME OF A SINGLE-MODE LASER DRIVEN BY BOTH COLORED PUMP NOISE WITH SIGNAL MODULATION AND QUANTUM NOISE WITH CROSS-CORRELATION BETWEEN ITS REAL AND IMAGINARY PARTS

2006 ◽  
Vol 20 (29) ◽  
pp. 1867-1878
Author(s):  
QING-HUA CHENG ◽  
DA-HAI XU ◽  
LI CAO ◽  
DA-JIN WU
Keyword(s):  
Correlation Time ◽  
Cross Correlation ◽  
Quantum Noise ◽  
Laser System ◽  
Single Mode ◽  
Time Correlation ◽  
Statistical Fluctuation ◽  
Intensity Correlation ◽  
Single Mode Laser ◽  
Modulation Signal

Using linear approximation method, we calculate the intensity correlation time of a single-mode laser driven by both colored pump noise with signal modulation and quantum noise with cross-correlation between its real and imaginary parts, and analyze the influence of the signal, noise and its cross-correlation form on the statistical fluctuation of the laser system. We detect that the "color" of pump noise is an important factor that affects the statistical fluctuation of the laser system. When the colored pump noise is short time correlation, within a determinate parameter range, the intensity correlation time can be prolonged, and the statistical fluctuation of the laser system can be restrained by increasing the amplitude of modulation signal. The specific frequency of input signal will result in intensity correlation time to appear maximum, and the statistical fluctuation of the laser system is least here. When the colored pump noise is long time correlation, within a determinate parameter range, the intensity correlation time can be also prolonged by increasing the frequency of modulation signal and decreasing its amplitude, and the statistical fluctuation of the laser system will decrease. In particular, when the intensity of quantum noise increases and the cross-correlation between its real and imaginary parts enhance, the intensity correlation time will prolong, and the statistical fluctuation of the laser system is restrained.

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