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The Log Normal model for weak turbulences and Gamma-Gamma model for moderate to strong turbulences are being used for calculating the path losses for engineering Free Space Optical (FSO) communication link. Since FSO has been an attractive substitute to overcome the issues of RF spectrum license, high infrastructure cost and difficult terrains to ensure the availability of a network. Their application in mountainous and high density built up areas needs to be exploited. Atmospheric turbulence degrades the FSO communication performance arising due to variations inCn2 {{C}}_{{n}}^2{\ }(Refractive index structure parameter). Both these models have the  limitation of NOT considering Rainfall parameter while calculatingC   n   2C_n^2. In this present paper we have  included effect of Rainfall  and presented the modified analytical model by  re modelingC   n   2C_n^2. To  validate the impact , comparison of existing model and the modified path loss model has been presented using Meteorological (MET) data for a designed FSO communication link between geographically known mountainous locations of North eastern region of Arunachal Pradesh. The results emphasize that, the  modified model is essential to ensure reliable and fail safe FSO link .

Modeling C 2 n by Inclusion of Rainfall Parameter and Validate Modified Log Normal and Gamma-Gamma Model on FSO Communication Link