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The channel capacity of the hypergeometric-Gaussian type-II (HyGG-II) beam propagating in ocean turbulence is investigated in this work. A method of utilizing a focusing mirror to enhance the channel capacity is further proposed. 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 about 100 m. Optimal enhancement is observed near the convergence point of the HyGG-II beam 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, the channel capacity can be further improved. 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 with Laguerre Gaussian beams, HyGG-II beams exhibit superior channel capacity at the same transmission distance, no matter whether focusing mirrors are used. The findings can serve as a reference for designing underwater wireless optical communication systems based on the HyGG-II-beam.
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Keywords:
- hypergeometric-Gaussian type-II beam /
- focusing mirror /
- ocean turbulence /
- channel capacity
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图 1 不同波长下聚焦HyGG-II光束、非聚焦HyGG-II光束和LG光束的信道容量随传输距离的变化
Figure 1. Variations of channel capacity with transmission distance for focused HyGG-II beam, unfocused HyGG-II beam, and LG beam with different wavelengths.
图 2 不同焦距下聚焦HyGG-II光束和非聚焦HyGG-II光束的信道容量随传输距离的变化
Figure 2. Variations of channel capacity with transmission distance for unfocused HyGG-II beam and focused HyGG-II beam with different focal lengths.
图 3 聚焦HyGG-II光束随传输距离的归一化光强分布
Figure 3. Normalized intensity distributions of focused HyGG-II beam with transmission distance.
图 4 不同束腰半径下聚焦HyGG-II光束、非聚焦HyGG-II光束和LG光束的信道容量随传输距离的变化
Figure 4. Variations of channel capacity with transmission distance for focused HyGG-II beam, unfocused HyGG-II beam, and LG beam with different beam waists.
图 5 不同单位质量动能耗散率下聚焦HyGG-II光束、非聚焦HyGG-II光束和LG光束的信道容量随传输距离的变化
Figure 5. Variations of channel capacity with transmission distance for focused HyGG-II beam, unfocused HyGG-II beam, and LG beam with different dissipation rates of kinetic energy per unit mass.
图 6 不同温度均方差耗散率下聚焦HyGG-II光束、非聚焦HyGG-II光束和LG光束的信道容量随传输距离的变化
Figure 6. Variations of channel capacity with transmission distance for focused HyGG-II beam, unfocused HyGG-II beam, and LG beam with different dissipation rates of mean-squared temperature.
图 7 不同温度盐度贡献比下聚焦HyGG-II光束、非聚焦HyGG-II光束和LG光束的信道容量随传输距离的变化
Figure 7. Variations of channel capacity with transmission distance for focused HyGG-II beam, unfocused HyGG-II beam, and LG beam with different ratios of temperature and salinity contributions.
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