研究目的
To evaluate the performance limits of a Spectral Amplitude Coding Optical Code Division Multiple Access (SAC-OCDMA) system in Free Space Optics (FSO) using Zero Cross Correlation (ZCC) codes under various weather conditions, focusing on link range.
研究成果
The SAC-OCDMA-FSO system using ZCC codes can achieve maximum link ranges of up to 1450 m for 622 Mbps and 1100 m for 1 Gbps under clear weather, but performance degrades significantly under foggy conditions (e.g., 61 m for 622 Mbps in dense fog). The system's performance is highly dependent on weather conditions and data rate, with higher data rates reducing link range due to increased BER.
研究不足
The study is limited to specific weather conditions (clear, haze, moderate fog, dense fog) and assumes high optical efficiency (τt = τr = 1). It does not account for other atmospheric effects like rain or turbulence, and the simulation is based on fixed parameters and ZCC code with weight=3 and 5 users.
1：Experimental Design and Method Selection:
The study uses numerical analysis and simulation to evaluate the SAC-OCDMA-FSO system with ZCC codes. Theoretical models include the FSO propagation model, attenuation models for fog and haze (Kruse and Kim models), and BER analysis using Gaussian approximation.
2：Sample Selection and Data Sources:
Weather conditions (clear, haze, moderate fog, dense fog) are defined based on visibility ranges and attenuation coefficients from literature.
3：List of Experimental Equipment and Materials:
Simulation software (Optisystem version
4：0), optical components (multiplexers, demultiplexers, power combiners, optical spectral encoders, Mach-Zehnder modulators, photodetectors, low-pass filters), and parameters such as transmitted power (10 dBm), wavelengths (6 nm), and data rates (622 Mbps, 1 Gbps). Experimental Procedures and Operational Workflow:
The system is simulated with insertion losses (2 dB for demultiplexer, multiplexer, power combiner), FSO channel losses (1 dB for transmitter and receiver interfaces), and geometric losses. BER is calculated versus link range under different weather conditions.
5：Data Analysis Methods:
BER is derived from SNR calculations, and results are validated through eye diagrams and Q-factor measurements.
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