研究目的
To design a highly birefringent dispersion compensating microstructure modified decagonal photonic crystal fiber for broadband transmission communication systems, achieving high negative dispersion and birefringence while matching the relative dispersion slope of single mode fibers.
研究成果
The proposed modified decagonal photonic crystal fiber achieves a high negative dispersion coefficient of -613 ps/(nm.km) and birefringence of 2.1×10^-2 at 1550 nm, with a relative dispersion slope matching that of standard single mode fibers. It enables broadband dispersion compensation over a 180 nm wavelength range with low confinement loss and is robust to fabrication variations, making it suitable for high-speed optical communication systems.
研究不足
The study is based on simulations and does not involve physical fabrication or experimental validation. The tolerance analysis for fabrication imperfections is limited to ±2% variations in air-hole diameters, which may not cover all practical manufacturing errors. The fiber design assumes ideal conditions and may face challenges in real-world implementation due to material and fabrication constraints.
1：Experimental Design and Method Selection:
The study uses a full-vector finite element method (FEM) with circular perfectly matched boundary layers (PML) to simulate the properties of the proposed photonic crystal fiber. This method is chosen for its accuracy in solving Maxwell's equations and modeling leakage in optical fibers.
2：Sample Selection and Data Sources:
The fiber is made of pure silica with a specific geometric structure involving air holes arranged in a decagonal pattern. No external datasets are used; all data is generated through simulation.
3：List of Experimental Equipment and Materials:
The primary material is pure silica. No specific equipment or devices are mentioned for physical experiments, as the work is computational.
4：Experimental Procedures and Operational Workflow:
The cross-section of the fiber is divided into homogeneous subspaces using FEM. Parameters such as pitch (Λ), air-hole diameters (d1, d3), and axes lengths (a, b) are varied to optimize dispersion and birefringence. Simulations are run to calculate chromatic dispersion, birefringence, confinement loss, effective area, and other properties.
5：Data Analysis Methods:
Data is analyzed using equations derived from Maxwell's equations, including calculations for dispersion, birefringence, confinement loss, effective area, and nonlinear coefficient. The relative dispersion slope (RDS) is compared to that of standard single mode fibers to evaluate compensation effectiveness.
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