Outage‑Probability Analysis of Mixed FSO‑VUWOC Systems with Generalized Transmit‑Laser Selection

Parameter	Value
Electro-optical conversion efficiency of LD $ρ$	0.5 W·A^-1［31］
Responsivity of PD $r$	0.28 A·W^-1［31］
Extinction coefficient of seawater $c_{u}$	0.151 m^-1［13］
Extinction coefficient of atmosphere $c_{f}$	0.0647 dB·km^-1［13］
Refractive-index structure parameter $C_{n}^{2}$	10^-15 m^-2/3［12］
Wavelength $λ$	530 nm^［31］
Dissipation rate of mean-squared temperature $χ_{T}$	5×10^-5 K²·s^-3［28］
Dissipation rate of turbulent kinetic energy per unit mass of fluid $ε$	1×10^-1 m²·s^-3［28］
Noise variance $σ_{n' u}^{2}$ and $σ_{n f}^{2}$	-100 dBm^［20］
Depth of laser sources from sea surface $d_{0}$	0^［28］
Outage threshold SNR $γ_{t h}$	10 dB^［20］

Table 2. VUWOC turbulence parameters

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Table 2. VUWOC turbulence parameters

Layer thickness $d_{k}$ /m	VUWOC link distance $d_{u}$ /m	Rytov variance $σ_{B_{k}}^{2}$	Turbulence parameter $(α_{k}, β_{k})$
20	20	$σ_{B_{1}}^{2} = 1.15$	$(α_{1}, β_{1}) = (4.23,2.33)$
	40	$σ_{B_{1}}^{2} = 1.15$	$(α_{1}, β_{1}) = (4.23,2.33)$
	40	$σ_{B_{2}}^{2} = 1.07$	$(α_{2}, β_{2}) = (4.32,2.45)$
	60	$σ_{B_{1}}^{2} = 1.15$	$(α_{1}, β_{1}) = (4.23,2.33)$
		$σ_{B_{2}}^{2} = 1.07$	$(α_{2}, β_{2}) = (4.32,2.45)$
		$σ_{B_{3}}^{2} = 0.96$	$(α_{3}, β_{3}) = (4.45,2.64)$
	80	$σ_{B_{1}}^{2} = 1.15$	$(α_{1}, β_{1}) = (4.23,2.33)$
		$σ_{B_{2}}^{2} = 1.07$	$(α_{2}, β_{2}) = (4.32,2.45)$
		$σ_{B_{3}}^{2} = 0.96$	$(α_{3}, β_{3}) = (4.45,2.64)$
		$σ_{B_{4}}^{2} = 0.84$	$(α_{4}, β_{4}) = (4.65,2.90)$

Table 3. FSO turbulence parameters
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Table 3. FSO turbulence parameters
FSO link
distance $d_{f}$ /km
Rytov
variance $σ_{B_{f}}^{2}$
Turbulence parameter $(α_{f}, β_{f})$
3 $0.52$ $(5.83,4.24)$
5 $1.33$ $(4.12,2.13)$
7 $2.47$ $(4.03,1.55)$

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Qi Zhang, Dianwu Yue, Gongnuo Zhao, Xianying Xu. Outage‑Probability Analysis of Mixed FSO‑VUWOC Systems with Generalized Transmit‑Laser Selection[J]. Chinese Journal of Lasers, 2024, 51(23): 2306003

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