Abstract
The aberrations formed in the wavefront of a propagating laser due to oceanic turbulence result in optical scintillation which reduces the capacity of the underwater optical wireless communication (UOWC) channels. In this work, the optical scintillation is mitigated by the adaptive optics technique and its corresponding effect on the channel capacity of the UOWC link is studied. In this respect, the channel capacity of the UOWC link employing a Gaussian beam and operating in weak oceanic turbulence is evaluated. The related entities for the evaluation such as the received signal intensity is derived by the help of the Huygens-Fresnel principle, and the scintillation index with and without adaptive optics compensation is obtained by the Rytov method. Low-order Zernike filter functions, namely, tilt, defocus, astigmatism, and coma are used to represent the turbulence-induced aberrations.
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