The error performance of relay-aided underwater wireless optical communication (UWOC) with wavelength diversity is investigated by considering the compound effects of absorption, scattering, and ocean turbulence. The outage probability and average bit error rate (ABER) of the serial-relay UWOC system based on wavelength diversity are derived. The effects of different relay hops, wavelength diversity orders, and anisotropy factors on the system performance of the signal-combining methods are analyzed in detail. It is observed that relay-aided technology can increase the distance of the communication link and effectively alleviate the limitations of underwater wireless optical fading. The results also show that the wavelength diversity system can help to reduce the scintillation effect of ocean turbulence on the received light, thereby reducing the ABER and outage probability of the system. This study is expected to contribute to the development of more robust UWOC systems operating in turbulent oceans.
The performance analysis of underwater optical wireless communication (UOWC) with digital pulse interval modulation in anisotropy oceanic turbulence environment is investigated. We aim at the packet error rate (PER) of UOWC system using Gaussian-Schell model beam and avalanche photodiode receiver. Based on the generalized Huygens-Fresnel principle, the received light intensity is derived. The effects of PER variations with anisotropy factor, modulation order of DPIM, coherent parameters of the GSM and the ratio of temperature to salinity contributions to the refractive index spectrum are investigated.
In this thesis, we designed and experimentally demonstrated a high-power high-speed underwater optical wireless communication (UOWC) system with wavelength conversion construction. External modulation based on 1064nm laser is used for high-speed information communication, as well as the optical amplifier is used to obtain enough optical power of 1064nm laser. After that, according to the quasi-phase-matching (QPM) conditions, the PPLN optical structure is designed to improve the wavelength conversion efficiency for achieving higher 532nm laser output power in 24.5℃~40°C. Compared to the 532nm LD modulation system, this system can output 1.4W 532nm laser power in 100Mbps. This system experiments in single link 100m water tap of the attenuation coefficient 0.73dB/m equivalent to the clear ocean, and the measured bit error rate (BER) is 6.2×10-6 in 100Mbps pseudo-random binary sequence (PRBS) data without the forward error correction (FEC). Based on receiver sensitivity and the seawater channel optical transmission model, the transmission performance was predicted to be 340m@100Mbps and 100m@2Gbps in the attenuation coefficient equivalent to pure seawater.
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