研究目的
To accurately characterize the two-dimensional (2D) spatial distribution of laser beam intensity for the design of receiver aperture and optimal spacing of the diversity scheme for an underwater laser communication system.
研究成果
The study found that in a highly scattering channel, the optical intensity distribution is no longer Gaussian and the effects of the divergence angle on 3 dB OISR are negligible. This indicates that geometric loss is no longer important for the design of receiver aperture and optimal spacing of the diversity scheme in highly scattering underwater communication channels.
研究不足
The study is limited by the assumptions made in the Monte Carlo simulation, such as the use of the Henyey–Greenstein function for scattering angles, which may not accurately represent all scattering events, especially for small and large angles. Additionally, the study focuses on specific underwater channel types and may not generalize to all underwater environments.
1：Experimental Design and Method Selection:
Utilized the Henyey–Greenstein function to compute the scattering angles of photons and examined the effects of the scattering underwater optical channel and optical system parameters on 3 dB OISR based on the Monte Carlo simulation method.
2：Sample Selection and Data Sources:
Simulated photons quantity is 5 × 107, with a laser source beam waist radius of 5 × 10?3 m, and divergence angles of 1, 5, and 10 mrad.
3：List of Experimental Equipment and Materials:
Laser source with specified beam waist radius and divergence angles, Monte Carlo simulation software.
4：Experimental Procedures and Operational Workflow:
Traced the propagation trajectory of photons in seawater using the Monte Carlo simulation method, considering six key parameters of photons.
5：Data Analysis Methods:
Analyzed the characteristics of the 3 dB OISR of the laser beam under various seawater channels using the Monte Carlo simulation data.
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