Adaptive gain control in underwater laser communication system

1998 ◽  
Author(s):  
Yimin Lu ◽  
Zhufeng Du ◽  
Yuankai Zheng
Keyword(s):  
Communication System ◽  
Gain Control ◽  
Laser Communication ◽  
Underwater Laser

scholarly journals Investigation of 3 dB Optical Intensity Spot Radius of Laser Beam under Scattering Underwater Channel

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 422
Author(s):  
Wei Wang ◽  
Xiaoji Li ◽  
Sujan Rajbhandari ◽  
Yanlong Li
Keyword(s):  
Laser Beam ◽  
Communication System ◽  
Laser Source ◽  
Laser Communication ◽  
Optical Intensity ◽  
Spot Radius ◽  
Optimal Spacing ◽  
Underwater Laser ◽  
Diversity Scheme ◽  
Intensity Spot

An important step in the design of receiver aperture and optimal spacing of the diversity scheme for an underwater laser communication system is to accurately characterize the two-dimensional (2D) spatial distribution of laser beam intensity. In this paper, the 2D optical intensity distribution and 3 dB optical intensity spot radius (OISR) are investigated due to the dominating optical intensity of laser beam being within the 3 dB OISR. By utilizing the Henyey–Greenstein function to compute the scattering angles of photons, the effects of the scattering underwater optical channel and optical system parameters on 3 dB OISR are examined based on the Monte Carlo simulation method. We have shown for the first time that in the channel with a high density of scattering particles, the divergence angle of the laser source plays a negligible role in 3 dB OISR. This is an interesting phenomenon and important for optical communication as this clearly shows that the geometric loss is no longer important for the design of receiver aperture and optimal spacing of the diversity scheme for the underwater laser communication system in the highly scattering channel.

Rapid Estimation of the Maximum Communication Distance for an Underwater Laser Communication System

2015 ◽  
Vol 42 (8) ◽  
pp. 0805007 ◽  
Author(s):  
胡秀寒 Hu Xiuhan ◽  
胡思奇 Hu Siqi ◽  
周田华 Zhou Tianhua ◽  
贺岩 He Yan ◽  
朱小磊 Zhu Xiaolei ◽  
...  
Keyword(s):  
Communication System ◽  
Laser Communication ◽  
Rapid Estimation ◽  
Communication Distance ◽  
Underwater Laser
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