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Atmospheric transmission at ～1.55 μm for free-space optical communication

机译：〜1.55μm的大气传输，用于自由空间光通信

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摘要

Free-space optics (FSO) holds the potential for high bandwidth communication, but atmospheric conditions can significantly affect the capability of a communication system to transfer information successfully. The effects of atmosphere on FSO communication and consequent optimal wavelength range for transmission are investigated through MODTRAN-based modeling of 1.55 μm transmission for multiple elevation angles in atmospheric conditions including clear maritime, desert extinction, and various levels of rain and fog. Beam transmission was also simulated for different relevant elevations for surface-to-surface and surface-to-air free-space optical communication networks. The atmospheric, free-space, and scintillation losses are investigated for optical path lengths of 2 km to determine transmit power required for successful data reception. In addition, FSO transmitter and receiver circuits were designed to optically relay an analog video signal and tested at path distances of up to 130 m. Using advanced tunable laser sources to provide illumination across wavelength ranges, particularly around the eye-safe 1.55 um wavelength, it should be possible to overcome transmission limitations associated with adverse weather and atmospheric conditions.
机译：自由空间光学（FSO）具有进行高带宽通信的潜力，但是大气条件会严重影响通信系统成功传输信息的能力。通过基于MODTRAN的1.55μm传输模型对大气条件下的多个仰角进行了研究，从而研究了大气对FSO通信以及传输的最佳波长范围的影响，包括在晴朗的海洋，沙漠灭绝以及各种降雨和雾气等大气条件下。还针对不同的相关仰角，对地对地和地对空自由空间光通信网络的光束传输进行了仿真。对于2 km的光程，研究了大气，自由空间和闪烁损耗，以确定成功接收数据所需的发射功率。此外，FSO发射器和接收器电路被设计为光学中继模拟视频信号，并在长达130 m的路径距离上进行了测试。使用先进的可调谐激光源在整个波长范围内提供照明，尤其是在人眼安全的1.55 um波长范围内，应该有可能克服与恶劣天气和大气条件相关的传输限制。

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