Liu Xiaoyan, Yi Suyu, Zhou Xiaolin, Fang Zhilai, Qiu Zhi-Jun, Hu Laigui, Cong Chunxiao, Zheng Lirong, Liu Ran, Tian Pengfei
Opt Express. 2017 Oct 30;25(22):27937-27947. doi: 10.1364/OE.25.027937.
To enable high-speed long-distance underwater optical wireless communication (UOWC) supplementing traditional underwater wireless communication, a low-power 520 nm green laser diode (LD) based UOWC system was proposed and experimentally demonstrated to implement maximal communication capacity of up to 2.70 Gbps data rate over a 34.5 m underwater transmission distance by using non-return-to-zero on-off keying (NRZ-OOK) modulation scheme. Moreover, maximum data rates of up to 4.60 Gbps, 4.20 Gbps, 3.93 Gbps, 3.88 Gbps, and 3.48 Gbps at underwater distances of 2.3 m, 6.9 m, 11.5 m, 16.1 m and 20.7 m were achieved, respectively. The light attenuation coefficient of ~0.44 dB/m was obtained and the beam divergence angle is 0.35°, so the aallowable underwater transmission distance can be estimated to be ~90.7 m at a data rate of 0.15 Gbps with a corresponding received light-output power of -33.01 dBm and a bit-error rate (BER) of 2.0 ×10. In addition, when the data rate is up to 1 Gbps, the UOWC distance is predicted to be ~62.7 m for our proposed UOWC system. The achievements we make are suitable for applications requiring high-speed long-distance real-time UOWC.
为了实现高速长距离水下光无线通信（UOWC）以补充传统水下无线通信，提出了一种基于低功率520 nm绿色激光二极管（LD）的UOWC系统，并通过实验证明，该系统使用非归零开关键控（NRZ-OOK）调制方案，在34.5 m的水下传输距离上实现了高达2.70 Gbps数据速率的最大通信容量。此外，在水下距离分别为2.3 m、6.9 m、11.5 m、16.1 m和20.7 m时，分别实现了高达4.60 Gbps、4.20 Gbps、3.93 Gbps、3.88 Gbps和3.48 Gbps的最大数据速率。获得了约0.44 dB/m的光衰减系数，光束发散角为0.35°，因此在数据速率为0.15 Gbps、相应接收光输出功率为-33.01 dBm且误码率（BER）为2.0×10时，允许的水下传输距离估计约为90.7 m。此外，当数据速率高达1 Gbps时，对于我们提出的UOWC系统，预测UOWC距离约为62.7 m。我们取得的成果适用于需要高速长距离实时UOWC的应用。
