研究目的
To enhance the capacity of radio over fiber links for 5G mobile networks using polarization multiplexed signal transmission, specifically by proposing a new conversion method and analyzing the impact of polarization mode dispersion.
研究成果
The Pol-Mux approach significantly enhances link capacity for 5G networks by enabling higher data rates through polarization multiplexing. Simulations show that with sufficient polarization extinction ratio, crosstalk is reduced, leading to better performance. The method allows conversion of 40 Gbit/s QPSK and 16-QAM signals to Pol-Mux signals, increasing spectral efficiency. Future work could focus on experimental validation and optimizing for real-world impairments.
研究不足
The study is based on simulations, which may not fully capture real-world complexities. Chromatic dispersion is neglected in some analyses, and fiber attenuation and other effects are not considered in certain parts. The proposed method requires high polarization extinction ratios (e.g., 22 dB) to minimize crosstalk, which might be challenging to achieve practically. The fiber length is limited to 130 km for good performance, indicating constraints in long-distance applications.
1：Experimental Design and Method Selection:
The study uses simulation-based methods to analyze the impact of polarization mode dispersion (PMD) on link quality and to propose a polarization multiplexed (Pol-Mux) technique. Simulations are conducted using a block diagram approach to model the optical fiber system, including components like modulators, photodiodes, and filters. The Pol-Mux technique involves using polarization controllers and beam combiners to multiplex signals.
2：Sample Selection and Data Sources:
Simulations are performed with varying parameters such as fiber length (up to 130 km), bit rate (e.g., 40 Gbit/s), and PMD coefficient (e.g., 0.5 ps/km^1/2). Data is generated using pseudo-random binary sequences and continuous wave optical signals at 1550 nm wavelength.
3：5 ps/km^1/2). Data is generated using pseudo-random binary sequences and continuous wave optical signals at 1550 nm wavelength.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Key components include a Mach-Zehnder modulator, optical fiber, PIN photodiode with 50 GHz bandwidth, Bessel low-pass filter, polarization controllers, polarization beam combiners, and a DFB laser. Software used is Optysesteme simulator.
4：Experimental Procedures and Operational Workflow:
The process involves generating signals, modulating them using modulators, transmitting through fiber with specified PMD, converting optical to electrical signals with a photodiode, filtering, and analyzing output using eye diagrams, quality factor, and symbol error rate. For Pol-Mux, orthogonal polarizations are separated and combined at transmitter and receiver.
5：Data Analysis Methods:
Analysis includes calculating quality factor (Q), bit error rate (BER), symbol error rate (SER), and visualizing results with eye diagrams and constellation plots. Statistical techniques are implied through simulation outputs.
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