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In this paper, we investigate the channel capacity of the Hypergeometric-Gaussian type-II (HyGG-II) beam propagating in ocean turbulence. Furthermore, we propose a method utilizing a focusing mirror to enhance the channel capacity. Comparison among focused HyGG-II beam, unfocused HyGG-II beam and Laguerre Gaussian beam is also carried out. The results indicate that the employment of focusing mirrors is effective in enhancing the channel capacity, however, the corresponding transmission distance range is restricted to approximately 100 meters. Optimal enhancement is observed near the convergence point of the HyGG-II beam as focused by mirrors. By increasing the wavelength and adjusting the focal length of the focusing mirror or the waist radius of the HyGG-II beam, further improvements in channel capacity can be achieved. Moreover, when the HyGG-II beam is transmitted in oceanic turbulence characterized by a smaller dissipation rate of kinetic energy per unit mass and a larger dissipation rate of mean-squared temperature, the enhancement effect of the focusing mirrors on the channel capacity is more pronounced. Compared to Laguerre Gaussian beam, HyGG-II beams exhibit superior channel capacity at the same transmission distance, irrespective of whether focusing mirrors are used. The findings can serve as a reference for the design of underwater wireless optical communication system based on HyGG-II-beam.
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Keywords:
- Hypergeometric-Gaussian type-II beam /
- focusing mirror /
- ocean turbulence /
- channel capacity
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