Abstract
The prediction of rain rate and corresponding attenuation is a vital parameter to be considered while analyzing a terrestrial free space optical (FSO) communication link. Actual tropical rainfall occurs for \(15\%\) of the year, therefore hourly data of rain rate must be accurately estimated for higher rainfall sites. This paper is concerned with the empirical determination of the power-law coefficients that allow for the development of a rain model. The measured attenuation for tropical rainy weather significantly varies from defined International Telecom Union (ITU-R) standard. The experimental work is examined using optimized laser wavelength, launched power and link range. The purpose of the study is to obtain the regression parameters (k and \(\alpha\)) for rain specific attenuation (RSA) applicable to tropical weather conditions. The test rain channel is imitated in the laboratory, where a 10 Mb/s, 1550 nm on-off keying (OOK) signal is propagated through the rain closet chamber of \(0.5\times 0.5\times 5\) m3. The effective optical link of 15 m is made using round-trip reflection by plane mirrors, and a concave mirror is used to gather irradiance onto the receiver aperture. The average RSA is measured from collected data for maximum rain intensity of 210 mm/h for the Indian monsoon. The testbed analyses FSO link in terms of received optical power, bit error rate (BER) and Q-factor. Using the least square mean equation approach, k and \(\alpha\) are estimated to be 0.63 and 0.91, respectively. The finding contributes to reporting power margin and improving the system performance for deploying an optical link in areas of higher rain intensity.
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Acknowledgements
This work is supported by CRS research Grant No.1-5763970771 received from NPIU-MHRD under TEQIP-III to Shri G S Institute of Technology and Science, Indore, India.
Funding
The CRS research Grant No. CRS 1-5763970771 from NPIU, MHRD, Govt. of India awarded to Dr. Gireesh G Soni financially supported the equipment purchase.
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GGS and AT contributed to the conceptualization of the proposed work. The experimental work was performed by MS, KA and GGS. The methodology for related work and draft preparation were done by AT. All authors edited the draft version of manuscript and approved the final one.
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Soni, G.G., Tripathi, A., Shroti, M. et al. Experimental study of rain affected optical wireless link to investigate regression parameters for tropical Indian monsoon. Opt Quant Electron 55, 384 (2023). https://doi.org/10.1007/s11082-023-04677-0
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DOI: https://doi.org/10.1007/s11082-023-04677-0