研究目的
To improve spectral efficiency and reduce non-linear distortion in radio over fiber systems by designing and simulating an advanced modulation technique called integrated alternate mark inversion (I-AMI) for long-haul transmission.
研究成果
The proposed I-AMI modulation technique demonstrates superior performance with high Q-factor (25.15) and low BER (4e-140) at 100 Gbps over 250 km, reducing signal degradation and chromatic dispersion effects. It outperforms existing techniques like MDRZ, CSRZ, and AMI, making it suitable for long-haul RoF systems with enhanced spectral efficiency and reduced non-linear distortion.
研究不足
The study is based on simulation results using OptiSystem software, which may not fully capture real-world complexities and non-linear effects. The system is single-channel, and further investigation is needed for multi-channel or practical implementations to validate the findings.
1：Experimental Design and Method Selection:
The study involves designing and simulating an I-AMI modulation technique using external modulation with an electro-absorption modulator (EAM) and dispersion compensation techniques for a radio over fiber (RoF) system. The simulation is conducted using OptiSystem (14.0) software to evaluate performance metrics such as Q-factor and BER at various bit rates and transmission distances.
2：0) software to evaluate performance metrics such as Q-factor and BER at various bit rates and transmission distances. Sample Selection and Data Sources:
2. Sample Selection and Data Sources: A single-channel RoF system is simulated with bit rates ranging from 5 to 100 Gbps and transmission lengths up to 250 km. The data is generated using a pseudo-random bit sequence (PRBS) generator.
3：List of Experimental Equipment and Materials:
Components include a continuous wave (CW) laser, Mach-Zehnder modulator (MZM), electro-absorption modulator (EAM), single-mode fiber (SMF), dispersion compensating fiber (DCF), erbium-doped fiber amplifier (EDFA), photodetector, and analyzers for BER and eye diagrams. Specific parameters are detailed in Table 1 of the paper.
4：Experimental Procedures and Operational Workflow:
The optical signal is generated by a CW laser, modulated using MZM and EAM driven by RF signals, transmitted through SMF with DCF for dispersion compensation, amplified by EDFA, and received by a photodetector. Performance is analyzed using eye diagrams and BER analyzers.
5：Data Analysis Methods:
Performance is evaluated based on Q-factor and BER values obtained from simulations, with comparative analysis against other modulation techniques (MDRZ, CSRZ, AMI).
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OptiSystem
14.0
Optiwave
Simulation software used for designing and analyzing the optical communication system, including modulation techniques and performance metrics.
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Electro-Absorption Modulator
Used for external modulation in the transmitter to generate the I-AMI modulation scheme, allowing longer transmission distances with minimal pulse broadening.
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Mach-Zehnder Modulator
Modulates the optical continuous wave signal based on the input binary data stream.
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Continuous Wave Laser
Generates the optical carrier signal for modulation.
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Single-Mode Fiber
Transmission medium for the optical signal, with characteristics that cause chromatic dispersion.
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Dispersion Compensating Fiber
Compensates for chromatic dispersion in the transmission link by providing negative dispersion.
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Erbium-Doped Fiber Amplifier
Amplifies the optical signal to compensate for losses in the fiber and DCF.
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Photodetector
Converts the received optical signal into an electrical current at the receiver end.
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