In this work, we report the development of long-haul high-speed underwater optical wireless communication (UOWC) transmission link by incorporating space division multiplexing (SDM) of distinct Hermite Gaussian (HG) modes for enhanced channel-capacity. Four distinct 20 Gbps non-return to zero encoded information signals are transmitted over distinct HG modes of a single wavelength laser at 1800 m underwater link range to realize an 80 Gbps UOWC system. Also, we investigate the performance of the proposed UOWC transmission link under the influence of different operating wavelengths, aperture diameter, attenuation coefficient, and link range. Further, we optimize the proposed UOWC link performance in terms of spatial aperture to stabilize the bit-error rate (BER) performance of the link at high signal attenuation values and varying transmission link reach.

中文翻译：

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结合Hermite高斯模式的空分复用的4 $$ \ $$××20 Gbps水下光学无线通信链路的建模和性能研究

在这项工作中，我们通过结合独特的Hermite高斯（HG）模式的空分复用（SDM）来增强通道容量，从而报告了远程高速水下光学无线通信（UOWC）传输链路的发展。四个不同的20 Gbps不归零编码信息信号通过单波长激光器的不同HG模式在1800 m水下链路范围内传输，以实现80 Gbps UOWC系统。此外，我们研究了建议的UOWC传输链路在不同工作波长，孔径，衰减系数和链路范围的影响下的性能。进一步，