Effects of anisotropic oceanic turbulence on the power of the bandwidth-limited OAM mode of partially coherent modified Bessel correlated vortex beams

Received Probability of Orbital-Angular-Momentum Modes Carried by Diffraction- and Attenuation- Resistant Beams in Weak Turbulent Oceans

“…The numerical curves in the figure show that, with the increase in , the received probability goes down-especially when is within the interval [−1, 0], the received probability decreases rapidly. This result indicates that, similar to other beams [7][8][9][10][11][12][13][14][15][16][17], the OAM modes of the DARR beam are more affected by the fluctuation in seawater salinity than by the fluctuation in seawater temperature. Figure 3 shows that the lower χ T and the higher ε will have higher received probability of the OAM signal mode of the DARR beam.…”

“…Figure 3 shows that the lower χ T and the higher ε will have higher received probability of the OAM signal mode of the DARR beam. The phenomenon can be explained through lower dissipation rates of the mean-squared temperature and a higher rate of dissipation of kinetic energy per unit mass of fluid, which corresponds to lower oceanic turbulence [7][8][9][10][11][12][13][14][15][16][17]. We also analyzed the impact of inner and outer scales of turbulence on the received probability of the OAM mode of the DARR beam.…”

“…Besides, our team has established the crosstalk [10] and the wander [11] models for OAM modes of Lommel-Gaussian beam. We also point out that the Hermi-Gaussian vortex beam [12] and partially coherent Bessel correlation vortex beam [13] can effectively suppress the wavefront distortion caused by turbulent seawater. Further, it was found that Gaussian pulsed X waves and Bessel-Gaussian localized vortex waves [15,16], through turbulent seawater, is higher than that of Laguerre-Gaussian beam in terms of resisting the effects of turbulence.…”

“…With the increasing demand for underwater resource development and utilization, the study of underwater optical communication systems with high information capacity has become a research hotspot in the field of underwater optical communication networks [1][2][3][4][5][6]. Recently, it has become one of the main targets of researchers in this field to improve the theoretical channel capacity of the optical communication system or to control the channel attenuation and channel capacity by selecting a new signal source (beam) [7][8][9][10][11][12][13][14][15][16][17], using adaptive optical systems [18] and by utilizing optimized signal coding technology [19][20][21]. It is well known that the orbital angular momentum (OAM) mode, carried by photons, provides a new dimension that can be encoded [22], and that the OAM module is related to the spatial distribution of wave function [22].…”

“…Therefore the OAM eigenstates (modes) offer the possibilities of realizing arbitrary base-N quantum states and higher capacity optical communication [23], and there is considerable interest in underwater optical communication. However, the spatial nature of the OAM carrier suggests that it may be susceptible to the disturbance of oceanic turbulence [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] as well as the absorption of seawater [1,17]. Choosing a special optical signal carrier is one of the effective methods to weaken the turbulent diffraction disturbance or absorption of seawater, so many research results have been reported on the propagation of scalar non-diffraction vortex beams in turbulent seawater, and great progress has been made based on different methods [7][8][9][10][11][12][13][14][15][16][17].…”