Detector of Optical Vortices as the Main Element of the System of Data Transfer: Principles of Operation, Numerical Model, and Influence of Noise and Atmospheric Turbulence

Figure 7

Relative intensity 𝐼_𝑟 calculated numerically with application of different phase screens 𝑁_𝑟(𝑁_𝑟∈[0,99]). Angles of field rotation Δ=180^∘ (a, b) and Δ=120^∘ (c, d), Fried’s coherence length 𝐿_F=0.25𝑟_0𝐵 (a, c) and 𝐿_F=0.1𝑟_0𝐵 (b, d). The uppermost and bottommost dashed lines correspond to values of 𝐼_𝑟=1.86 and 0.14. Dashed lines in the central part of the picture correspond to 𝐼_𝑟=1 with threshold values of 0.97 and 1.06 (a and c) and to 𝐼_𝑟=1 and threshold values of 0.82 and 1.12 (b and d).

(a)

(b)

(c)

(d)