Combined effect of turbulence and aerosol on free-space optical links

Libich Jiri; Perez Joaquin; Zvanovec Stanislav; Ghassemlooy Zabih; Nebuloni Roberto; Capsoni Carlo

摘要

Despite the benefits of free-space optical (FSO) communications, their full utilization is limited by the influence of atmospheric weather conditions, such as fog, turbulence, smoke, snow, etc. In urban environments, additional environmental factors such as smog and dust particles due to air pollution caused by industry and motor vehicles may affect FSO link performance, which has not been investigated in detail yet. Both smog and dust particles cause absorption and scattering of the propagating optical signal, thus resulting in high attenuation. This work investigates the joint impact of atmospheric turbulence and dust particle-imposed scattering on FSO link performance as part of the last-mile access network in urban areas. Propagation of an optical wave is at first analyzed based on the microphysic approach, and the extinction caused by small particles is determined. An experimental measurement campaign using a dedicated test chamber is carried out to assess FSO link performance operating wavelengths of 670 nm and 830 nm and under dust and turbulent conditions. The measured attenuation and the Q factor in terms of the velocity of particle flow and turbulence strength are analyzed. We show that for an airflow of 2 m/s, the Q factor is almost 3.5 higher at the wavelength of 830 nm than at 670 nm. However, for a wavelength of 670 nm, the FSO link is less affected by the increase in airflow compared to 830 nm. The Q factor reduces with turbulence. Under similar turbulence conditions, for ash particles, the Q factor is higher than that of sand particles. (C) 2017 Optical Society of America

机译：尽管自由空间光学（FSO）通信有益，但它们的充分利用率受到大气天气条件的影响，例如雾，湍流，烟雾，雪等。城市环境中的雾化，烟雾等额外的环境因素，如烟雾和灰尘由于工业和机动车辆引起的空气污染导致的颗粒可能会影响FSO链接性能，但尚未详细调查。烟雾和灰尘颗粒均导致传播光信号的吸收和散射，从而导致高衰减。这项工作调查了大气湍流和灰尘粒子施加散射对城市地区最后一英里接入网络的一部分的关节影响。首先基于微微物理学方法分析光波的传播，并确定由小颗粒引起的消光。进行使用专用测试室的实验测量运动，以评估670nm和830nm和灰尘和湍流条件下的FSO链路性能工作波长。分析了测量的衰减和Q因子的颗粒流动和湍流强度的速度。我们表明，对于2米/秒的气流，Q系数在830nm的波长下几乎高出3.5，而不是670 nm。然而，对于670nm的波长，与830nm相比，通过气流的增加，FSO链路较小。 Q因子随湍流减少。在类似的湍流条件下，对于灰分颗粒，Q系数高于沙粒的Q系数。（c）2017年光学学会

Combined effect of turbulence and aerosol on free-space optical links

摘要

著录项

相关主题

期刊订阅