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首页> 外文会议>Free-space laser communication and atmospheric propagation XXIX >Effect of Tropical climate on the propagation characteristics of terrestrial FSO Links: A Case Study
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Effect of Tropical climate on the propagation characteristics of terrestrial FSO Links: A Case Study

机译：热带气候对陆地FSO链路传播特性的影响：一个案例研究

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Free Space Optical (FSO) systems are being actively considered as viable options for seamless integration between backhaul optical fiber links and RF or copper links used for last mile connectivity. However, adverse atmospheric conditions can affect the performance and distance over which the link can operate reliably. Propagation of optical waves through the atmosphere is affected by atmospheric turbulence, scattering of aerosols and atmospheric absorption. Atmospheric turbulence is a result of localized variations of temperature, humidity, and pressure in the atmosphere. Turbulence is by nature a random process, and as such may be described using statistical quantities. Atmospheric turbulence induced fading is one of the main impairments affecting Free Space Optics (FSO). FSO systems can suffer outages in the presence of heavy fog, smog and haze. Many places in India see very heavy rainfall. We have studied the effects of rainfall on propagation characteristics in Dakshina Kannada district, Karnataka, India where Surathkal is located which is affected by heavy rainfall for about four to six months in a year. We observe that the attenuation during heavy rainfall is quite high and leads to extremely low levels of the received signal or complete erasure of the transmitted data. With the validation through simulation in this paper, on the use of Digital Fountain codes in FSO links, we suggest that if such codes are used in areas prone to rainfall, it would help in the recovery of dropped packets and would also improve the BER performance.
机译：自由空间光学（FSO）系统被积极地视为在回程光纤链路与用于最后一英里连接的RF或铜缆链路之间进行无缝集成的可行选择。但是，不利的大气条件会影响链路可以可靠运行的性能和距离。光波在大气中的传播受到大气湍流，气溶胶散射和大气吸收的影响。大气湍流是大气中温度，湿度和压力局部变化的结果。湍流本质上是一个随机过程，因此可以使用统计量进行描述。大气湍流引起的衰落是影响自由空间光学（FSO）的主要障碍之一。在浓雾，烟雾和霾的存在下，FSO系统可能会停机。印度的许多地方降雨都很大。我们已经研究了降雨对印度苏拉特卡勒（Suathkal）所在的印度卡纳塔克邦（Dakshina Kannada）地区的传播特性的影响，该地区一年受到大约4至6个月的强降雨影响。我们观察到，暴雨期间的衰减非常高，导致接收信号的电平极低，或者完全擦除了传输的数据。通过本文中通过仿真进行的验证，关于在FSO链路中使用数字喷泉代码，我们建议，如果将此类代码用于容易降雨的区域，则将有助于恢复丢弃的数据包，并提高BER性能。 。

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