研究目的
To design and simulate a hybrid WDM-based FSO system using MSK and DPSK modulation techniques to evaluate their performance in terms of BER, Q-factor, and receiver sensitivity under rain attenuation conditions.
研究成果
The simulation shows that DPSK modulation provides better BER performance compared to MSK in hybrid WDM-FSO systems under rain attenuation. For single channel, DPSK achieves a link distance of 1.88 km with BER of 1.20x10^-9 and receiver sensitivity of -32.392 dBm, while MSK achieves 1.83 km with BER of 2.67x10^-9 and sensitivity of -30.797 dBm. In hybrid systems, DPSK offers lower BER (e.g., 1.08x10^-9) and comparable sensitivity, making it more effective for FSO communication in rainy conditions.
研究不足
The study is based on simulation using Opti-System 7.0 and may not account for all real-world atmospheric variations. It focuses on rain attenuation in Tamil Nadu, which may not be generalizable to other regions. The modulation techniques are limited to MSK and DPSK, and the system performance is evaluated only up to 1.9 km link distance.
1：Experimental Design and Method Selection:
The experiment involves designing a hybrid WDM-FSO system model using simulation software Opti-System 7.0. The system includes transmitter components like CW laser, Mach-Zehnder modulator, PRBS generator, MSK and DPSK pulse generators, and hybrid WDM with CWDM and DWDM channels. The receiver section includes demultiplexer, photodiode, low pass filter, 3R regenerator, BER analyzer, and optical power meter. The performance is evaluated under rain attenuation conditions based on data collected over six months.
2：The system includes transmitter components like CW laser, Mach-Zehnder modulator, PRBS generator, MSK and DPSK pulse generators, and hybrid WDM with CWDM and DWDM channels. The receiver section includes demultiplexer, photodiode, low pass filter, 3R regenerator, BER analyzer, and optical power meter. The performance is evaluated under rain attenuation conditions based on data collected over six months.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: Rain intensity data for Tamil Nadu was collected from weather reports over six months (January to June 2017) to calculate rain attenuation.
3：List of Experimental Equipment and Materials:
Simulation software Opti-System 7.0 is used; specific hardware is not detailed as it is a simulation study.
4：0 is used; specific hardware is not detailed as it is a simulation study.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The system is simulated with parameters including data rate of 2.5 Gbps, launch power of 25 dBm, wavelength of 1550 nm, channel spacings of 20 nm for CWDM and 0.8 nm for DWDM, and rain attenuation of 20.5 dB/km. BER, Q-factor, and receiver sensitivity are measured with respect to link distance.
5：5 Gbps, launch power of 25 dBm, wavelength of 1550 nm, channel spacings of 20 nm for CWDM and 8 nm for DWDM, and rain attenuation of 5 dB/km. BER, Q-factor, and receiver sensitivity are measured with respect to link distance.
Data Analysis Methods:
5. Data Analysis Methods: Data is analyzed using BER analyzer in Opti-System and MATLAB for graph generation, focusing on BER vs. distance and BER vs. receiver sensitivity.
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