Photomultiplier tube (PMT) receiver is a promising solution for long-distance underwater wireless optical communication (UWOC) due to its characteristics of high gain, low noise, and large receiver area. However, the complex underwater environment leads to the dynamic change of the received optical intensity and impacts the stability and reliability of UWOC system using PMT. In this work, the bandwidth limitation and performance degradation of UWOC system caused by PMT saturation is experimentally observed and characterized for various optical intensity and PMT gain. A low-cost, high-integrated, and small-volume receiver control system and relevant adaptive control strategy are proposed to improve the stability and reliability of UWOC system by dynamically adjusting the received optical power and PMT gain according to the detected optical signal. The experiment results show that the dynamic range of UWOC received optical power can be extended to 68 dB (-63 dBm~5 dBm) for 100 Mbit/s OOK modulation based UWOC system.

中文翻译：

---

利用光电倍增管接收器实现可靠高速水下无线光通信的自适应接收器控制


光电倍增管（PMT）接收器具有高增益、低噪声和大接收面积等特点，是长距离水下无线光通信（UWOC）的一种有前途的解决方案。然而，复杂的水下环境导致接收光强的动态变化，影响了采用PMT的UWOC系统的稳定性和可靠性。在这项工作中，针对不同的光强度和 PMT 增益，通过实验观察和表征了由 PMT 饱和引起的 UWOC 系统的带宽限制和性能下降。提出一种低成本、高集成度、小体积的接收机控制系统和相关的自适应控制策略，通过根据检测到的光信号动态调整接收光功率和PMT增益，提高UWOC系统的稳定性和可靠性。实验结果表明，基于100 Mbit/s OOK调制的UWOC系统，UWOC接收光功率的动态范围可扩展至68 dB（-63 dBm~5 dBm）。