研究目的
To investigate the link performance of Free Space Optics (FSO) under climatic conditions such as fog, rain, and snow at various wavelengths, aiming to achieve minimal Bit Error Rate (BER), suitable transmitting power, optimum link margin, and reliable data transmission rate at a maximum link distance of 1km.
研究成果
The paper concludes that climatic conditions significantly affect FSO link performance, with fog having the highest attenuation. There is an inverse relationship between received power and link distance due to scattering and absorption. The choice of wavelength impacts attenuation, with longer wavelengths allowing for extended transmission. Future work should focus on seasonal weather variations and developing mitigation techniques to enhance quality of service.
研究不足
The study is based on theoretical analysis and simulation using historical weather data, which may not fully capture real-time variations. It focuses on specific wavelengths and South African climate, limiting generalizability to other regions or conditions. Mitigation techniques for weather impairments are not addressed in this paper.
1：Experimental Design and Method Selection:
The study uses theoretical analysis and simulation to evaluate FSO link performance under different weather conditions. Kruse model is chosen for fog attenuation due to its wavelength dependence. NRZ-OOK modulation techniques are employed, and a PIN photodiode is used in the transmitter.
2：Sample Selection and Data Sources:
Visibility and rain data are collected from the South Africa Weather Services (SAWS) for eight stations over 10 years.
3：List of Experimental Equipment and Materials:
Simulation parameters include transmitter power, laser beam divergence angle, efficiencies, wavelengths, link distance, visibility, temperature, humidity, rain rate, receiver sensitivity, data rate, Boltzmann constant, photodiode temperature, dark current, responsibility, and electrical bandwidth.
4：Experimental Procedures and Operational Workflow:
Data is processed, FSO signal characterization is performed, and performance analysis is implemented through simulation. Attenuation contributions from rain, fog, and snow are integrated into the generated FSO signal.
5：Data Analysis Methods:
Analysis involves calculating attenuation using power law for rain and models for fog and snow, and evaluating link margin and received power against distance and wavelength.
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