The most significant challenge of underwater optical wireless communication (UOWC) system is to overcome its limited coverage. To expand the achievable communication range, we investigate the performance of the dual-hop UOWC system with simultaneous lightwave information and power transfer (SLIPT). The time splitting (TS) method is adopted for wireless power transfer in the proposed system, where the information and energy are transmitted in different phases. A suitable transmission strategy is designed for the model without additional power supply, which contains three phases, i.e. information transmission, energy transmission, and forwarding process. The expressions of the average bit error rate (BER) at the target node and the energy harvested by the relay node are derived over underwater attenuation channel. Then, the effects of the TS factor and the distances on the system performance are investigated in two sub-problems, which minimize the average BER while satisfying the energy harvesting and transmitting rate constraints. Numerical results indicate the performance improvement by adopting the relay node with SLIPT.

中文翻译：

---

同时传输光波信息和电力的双跳水下光无线通信系统


水下光无线通信（UOWC）系统最重大的挑战是克服其有限的覆盖范围。为了扩大可实现的通信范围，我们研究了具有同步光波信息和功率传输 (SLIPT) 的双跳 UOWC 系统的性能。该系统采用时间分割（TS）方法进行无线电力传输，其中信息和能量在不同相位中传输。针对无需额外供电的模型，设计了合适的传输策略，该策略包含信息传输、能量传输和转发过程三个阶段。目标节点的平均误码率（BER）和中继节点收集的能量的表达式是在水下衰减信道上推导的。然后，在两个子问题中研究了 TS 因子和距离对系统性能的影响，这两个子问题在满足能量收集和传输速率约束的同时最小化平均 BER。数值结果表明采用带有SLIPT 的中继节点可以提高性能。