Attenuation coefficient of seawater channel is not only related to the wavelength of optical, but also attenuation particle distribution, so the energy attenuation coefficient of the optical actual transmission changes with the attenuation particle distribution in the seawater, yet in the current underwater optical transmission simulation study, mostly adopts the method of selecting wavelength to determine the attenuation coefficient. Based on the existing of the Monte Carlo method, using the inverse function of modified Henyey Greenstein function to determine the optical scattering angle, and using photons weight change law to determine the photon annihilation. Respectively in the condition of a fixed seawater attenuation coefficient and attenuation coefficient changing with depth, this paper dynamically simulated the underwater optical slant path transmission of power attenuation and bit error rate, and analyzed the influence of the photons movement in power attenuation and bit error rate.
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