Microwave-modulated optical systems for free-space and undersea communications

虽然提供了灵活、快速的部署，但自由空间和水下通信没有跟上光纤通信的进步，目前的系统在范围和数据速率方面受到明显限制。为了满足这些需求，我们将开发使用相干探测的新型激光系统，红外输出用于在空中传输人眼安全，蓝绿色输出用于水下传输。该信号是光载波上的微波调制，允许在保持信号相干的同时进行更远距离的传输。主要优势包括更高的检测灵敏度，以及扩大调制频率和功率的潜力，以实现更高的数据速率和更长的传播距离。

Although offering flexible, rapid deployment, free space and underwater comunications have not kept up with progress in optical fibre communications, and current systems are signficantly restricted in range and data rate. To address these needs, we will develop novel laser systems using coherent detection, with infrared output for eyesafe transmission in air, and blue-green output for transmission underwater. The signal is a microwave modulation on the optical carrier, which permits longer-range transmission while maintaining signal coherence. Key advantages include increased detection sensitivity, and potential to scale up the modulation frequency and the power for higher data rates and longer propagation distance.