Zhang Jinrun, Fan Fan, Zeng Jinwei, Wang Jian
Opt Express. 2021 Oct 25;29(22):35570-35578. doi: 10.1364/OE.442728.
The orbital angular momentum (OAM) multiplexing technology is an essential method to boost underwater wireless optical communication (UWOC) capacity. However, state-of-art UWOC systems are often demonstrated in the laboratory using bulky and high power-consumption instruments, which can be impractical in a realistic environment. In this work, we propose, design and demonstrate a compact and energy-efficient OAM multiplexing UWOC prototype with complete packaging. Indeed, we improve the signal generation, modulation, receiving and processing components by employing the integrated programmable chips. We also employ two geometric phase Q-plate chips as an OAM multiplexer and de-multiplexer, respectively. Owing to the improvement of these components and the optical design, we package the complete UWOC system in two 65cm×35cm×40cm boxes with the power consumption of 20W. Our experiment demonstrates such a completely packaged prototype can support two 625Mbit/s channels (OAM, OAM) multiplexing in a 6-meter underwater environment with fidelity.
轨道角动量（OAM）复用技术是提升水下无线光通信（UWOC）容量的关键方法。然而，当前先进的UWOC系统通常在实验室中使用体积庞大且功耗高的仪器进行演示，这在实际环境中可能并不实用。在这项工作中，我们提出、设计并展示了一个具有完整封装的紧凑型且节能的OAM复用UWOC原型。实际上，我们通过采用集成可编程芯片改进了信号生成、调制、接收和处理组件。我们还分别采用两个几何相位Q盘芯片作为OAM复用器和解复用器。由于这些组件的改进和光学设计，我们将完整的UWOC系统封装在两个65cm×35cm×40cm的盒子中，功耗为20W。我们的实验表明，这样一个完全封装的原型能够在6米深的水下环境中以高保真度支持两个625Mbit/s通道（OAM，OAM）的复用。
