| 1 Gbps实时传输的自由空间光通信链路损耗 |
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| 引用本文： | 郭树怀,王天鹤,冀霞,党莹,吕解. 1 Gbps实时传输的自由空间光通信链路损耗[J]. 红外与激光工程, 2019, 48(6): 622004-0622004(7). DOI: 10.3788/IRLA201948.0622004 |
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| 作者姓名： | 郭树怀 王天鹤 冀霞 党莹 吕解 |
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| 作者单位： | 1.邢台医学高等专科学校,河北 邢台 054000; |
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| 摘 要： | 远距离自由空间光学（FSO）通信系统面临的最大挑战是在大气湍流影响下信号传输会造成光强度衰减/波动，导致通信链路中断。文中提出了一种基于通信系统接收功率的对数正态统计来计算由湍流引起的通信链路损耗的方法，可评估指导FSO通信系统中的系统参数。文中模拟了不同强度湍流影响，接收终端口径为2 cm、20 cm条件下，850 nm、1 550 nm波长的光通信链路损耗与传输距离的关系。然后利用模拟分析结果设计了一个接收口径为20 cm的FSO通信系统，在强湍流条件下完成~2 km距离传输高清图像和视频。FSO通信系统的传输速率为1 Gpbs，与4 G网络相比，可以满足大量无压缩数据流传输的清晰度和实时性。
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| 关 键 词： | 自由空间光通信 闪烁损耗 接收强度分布 光链路损耗 高传输速率 |
| 收稿时间： | 2019-01-11 |
Link loss of the free space optical communications of real-time transmission with 1 Gbps |
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| Affiliation: | 1.Xingtai Medical College,Xingtai 054000,China;2.Tianjin Jinhang Institute of Technical Physics,Tianjin 300308,China |
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| Abstract: | The biggest challenge for free space optical(FSO) communication systems is the attenuation/fluctuation of light intensity caused by influence of atmospheric turbulence in long distance communication, resulting in communication link interruption. A method to calculate the link loss due to atmospheric turbulence, based on lognormal statistics of the received power, was presented. It can be used to evaluate the system parameters in FSO communication system. The effects of different intensity turbulence were simulated, and the relationship between optical communication link loss and transmission distance at 850 nm and 1 550 nm wavelengths at receiving terminals of 2 cm and 20 cm was obtained. Then the simulated analysis results were used to design a FSO communication system with a receiving aperture of 20 cm, which could transmit HD image and video at a distance of about 2 km under strong turbulence conditions. The transmission rate of the FSO communication system was 1 Gpbs which could meet the sharpness and real-time performance of large amount of uncompressed data transmission compared with the 4 G networks. |
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