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现有的无线光通信系统中,光功率衰减模型普遍采用的是平面波假设下的模型,而实际无线光通信系统发射的激光是高斯光束。因此,建立高斯光束下的光功率衰减模型更加符合实际情况。利用理论推导结合仿真的方法,分析了高斯光束下发射光功率计算中积分限的选取,在综合考虑精确性和简易性的原则下,建立了高斯光束的光功率衰减模型,并以此为基础,比较了平面波和高斯光束下的光功率衰减模型,研究了平面波近似带来的误差。结果表明:两种模型明显不同,平面波假设下的模型会低估无线光通信系统的性能,在分析最大可通信距离时会带来12%~13%的相对误差。
In the existing wireless optical communication system, a model under the assumption of plane wave is generally adopted in the optical power attenuation model, and the laser emitted by the actual wireless optical communication system is a Gaussian beam. Therefore, it is more realistic to establish the optical power attenuation model under the Gaussian beam. Based on the theoretical derivation and simulation, this paper analyzes the choice of integral limits in the calculation of the transmitted light power under the Gaussian beam. Based on the principle of considering the accuracy and simplicity, the optical power attenuation model of the Gaussian beam is established and based on it The attenuation model of optical power under plane wave and Gaussian beam was compared and the error caused by plane wave approximation was studied. The results show that the two models are obviously different. The model under the plane wave assumption will underestimate the performance of the wireless optical communication system, and will bring about 12% ~ 13% relative error when analyzing the maximum communicable distance.