研究目的
To propose and analyze a novel bidirectional RoF architecture using OFDM SSB modulation techniques to mitigate Rayleigh backscattering and reflections interferences.
研究成果
The modified SSB technique provides better performance by eliminating second-order RB-RE harmonic interferences, leading to higher OSRNR compared to conventional SSB. Theoretical and simulation results show excellent agreement, confirming the effectiveness of the proposed architecture in mitigating RB-RE noise in bidirectional RoF systems.
研究不足
The study does not address all potential sources of noise or nonlinearities beyond RB-RE, and the model assumes specific fiber and device parameters that may vary in practical applications. Optimization of parameters like α and gains is based on simulations and may require empirical validation.
1：Experimental Design and Method Selection:
The study uses a theoretical model and numerical simulations to compare conventional and modified SSB OFDM techniques for bidirectional RoF transmission, focusing on mitigating RB-RE interferences by eliminating higher-order harmonics.
2：Sample Selection and Data Sources:
Not explicitly specified in the provided text.
3：List of Experimental Equipment and Materials:
Includes MZM (Mach-Zehnder Modulator) with specified switching and bias voltages, CW laser with 0dBm power and 10MHz linewidth, EDFA (Erbium-Doped Fiber Amplifier) with gains G1 and G2, optical filters (e.g., tunable OBF BVF-300 with 1552.52nm and 0.1nm bandwidth), optical splitter, and fiber with 30km length, dispersion of 16.75 ps/nm/km, and attenuation of 0.2dB/km.
4：52nm and 1nm bandwidth), optical splitter, and fiber with 30km length, dispersion of 75 ps/nm/km, and attenuation of 2dB/km.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: At OLT, an OFDM signal (10GBps data, 4QAM, 512 subcarriers, 25% cyclic prefix) is applied to MZM to generate SSB signal, amplified by EDFA, and filtered. At ONU, signal is split for demodulation and carrier extraction. RB-RE interferences are modeled mathematically, and simulations are performed to analyze effects of modulation index (α) and gains (G1, G2) on OSRNR.
5：Data Analysis Methods:
Numerical analysis and software simulations are used to validate theoretical models, with results compared for conventional and modified SSB techniques.
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