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Effect of underwater suspended particles on the transmission characteristics of polarized lasers

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Abstract

The complex problem related to the transmission channel of underwater polarized lasers is caused by underwater suspended particles. In order to study the effect of suspended particles on underwater optical communication links and laser polarization characteristics, a method based on a combination of Mie scattering theory and Monte Carlo numerical simulation is used to establish the transmission model of underwater photons. This method is applied to analyze the effect of suspended particles on normalized received energy and channel delay. We also investigate the effects of particle and channel length on the polarization characteristics of four different types of polarized lasers. Theoretical analysis and simulation results indicate that the optical coefficients of particles increase with increasing particle size. Thus, when the transmission channel length is the same, the received normalized energy and light intensity will decrease, and the channel time delay will increase. Meanwhile, a depolarization phenomenon with respect to the laser will be generated with increasing particle size, and particle size has a greater effect on linearly polarized light than circularly polarized light. Therefore, circularly polarized light maintains good polarization characteristics in the underwater laser transmission process.

© 2018 Optical Society of America

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