Figure 3 | Scientific Reports

Figure 3

From: Modal coupling and crosstalk due to turbulence and divergence on free space THz links using multiple orbital angular momentum beams

Figure 3

Normalized power distribution on different OAM modes when transmitting OAM + 4 with the same beam waist w0 = 1 m through a 1-km link. Parameters are set as (a) \({C}_{n}^{2}\) = 1 × 10–11 m−2/3, f = 0.1 THz, and (b) \({C}_{n}^{2}\) = 1 × 10–11 m-2/3, f = 1 THz. A single OAM + 4 beam is transmitted at the transmitter side, and the power distribution on OAM + 2 to + 6 are simulated at the receiver side. The power on OAM + 4 decreases by ~ 12 dB in (b), which could be due to the turbulence-induced power leakage from OAM + 4 to other OAM modes.

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