Effects of anisotropic oceanic turbulence on the propagation of the OAM mode of a partially coherent modified Bessel correlated vortex beam

Capacity of the Weakly Absorbent Turbulent Ocean Channel with the Coaxial Double-Position Power Gaussian Vortex

“…As increases, channel capacity decreases. This study is similar to studies for the single vortex information carrier [9][10][11][12][13][14][15][16][17][18][19][20][21][22], and salinity fluctuations have a greater impact on the channel capacity with a larger number of channels.…”

“…In Figure 8, we investigate the effects of the temperature-salinity contribution ratios and different wavelength λ on the channel capacity of the RCDPPGV carrier in the "seawater light transmission window". Similar to any other type of beam [9][10][11][12][13][14][15][16][17][18][19][20][21][22], Figure 8 shows that the channel capacity of the RCDPPGV carrier increases with increasing λ . This is because the long-wavelength beam has lower scintillations [25].…”

“…This result indicates that the link with single-position power Gaussian vortex has maximum channel capacity. Similar to any other type of beam [9][10][11][12][13][14][15][16][17][18][19][20][21][22], Figure 6 shows that the channel capacity also increases with the increase in channel number. Figure 7 shows that channel capacity decays rapidly as absorption increases.…”

“…However, due to the presence of various constituents in the ocean and oceanic turbulence, seawater scattering and absorption inevitably limit the transmission of information carried by OAM modes over optical communication links [8][9][10][11][12][13][14][15][16][17][18]. Therefore, in order to reduce the above negative effects of seawater and consider the relationship between signal transmission probability and channel capacity, a lot of studies have been conducted from the perspectives of OAM detection probability and link channel capacity.…”

“…For partially coherent modified Bessel correlated vortex beam, the effect of high-anisotropic ocean turbulence on OAM signal is weaker than that of low-anisotropic ocean turbulence. In addition, the mode with low OAM quantum number can be selected to improve the information transmission of the link, and the OAM mode with large energy level difference between neighboring OAM can be used to reduce the impact of turbulence, to improve the information capacity of the optical communication link [12]. The channel capacity of the link increases as the pulse width of the half-modulated input pulse increases and the Bessel cone angle decreases.…”