Author: Hamza GERÇEKCİOĞLU
Publishing Date: 2017
E-ISSN: 2147-9364
Volume: 5 Issue: 3
ABSTRACT:
Based on Rytov method, on-axis scintillation index of laser communication link in a weak oceanic medium is formulated for collimated annular beam. Employing these obtained scintillation values, average bit error rate () is evaluated where the intensity has log-normal distribution. Scintillation indices of collimated annular beams are found for fixed primary source size , varying annular beam thickness, propagation distance , source size , the rate of dissipation of the mean squared temperature , non-dimensional parameter representing the relative strength of temperature and salinity fluctuation . versus the source size and the average signal to noise found for the collimated annular beams are exhibited for various rate of dissipation of turbulent kinetic energy per unit mass of fluid and source sizes . At the stated link lengths, as secondary source size of annular beam equals to zero, that is, for Gaussian beam, will offer more advantages.
Keywords: Oceanic turbulence; Ocean optics; Optical communication; Scintillation; BER