Fig. 1. Schematic diagram of coherent detection principle for underwater wireless optical communication

Fig. 2. Variation of heterodyne efficiency with wavelength

Fig. 3. Variation of heterodyne efficiency with girdle radius and coherence. (a) Beamwidth radius for different signals σ_S; (b) beamwidth radius for different intrinsic oscillations σ_L; (c) optical coherence of different signals δ_S; (d) optical coherence of different intrinsic oscillations δ_L

Fig. 4. Variation of light intensity in effective detection area with light source parameters. (a)‒(c) σ_S =0.01, 0.02, 0.05 m; (d)‒(f) σ_L=0.01, 0.02, 0.05 m; (g)‒(i) δ_S= 0.01, 0.02, 0.03 m; (j)‒(l) δ_L= 0.01, 0.02, 0.03 m

Fig. 5. Variation of heterodyne efficiency with ocean turbulence parameters. (a) Variation of heterodyne efficiency with ε; (b) variation of heterodyne efficiency with χ_T; (c) variation of heterodyne efficiency with ω; (d) variation of heterodyne efficiency with l₀

Fig. 6. Variation of light intensity with ocean turbulence parameters. (a)‒(c) ε = 1×10^-2, 1×10^-3, 1×10^-6 m²/s²; (d)‒(f) χ_T = 1×10^-9, 1×10^-7, 1×10^-6 K²/s; (g)‒(i) ω = -5, -3, -1; (j)‒(l) l₀ = 0.001, 0.010, 0.100 m

Fig. 7. Variation of heterodyne efficiency with detector diameter