研究目的
To design a novel photonic crystal fiber that simultaneously achieves a large negative dispersion and high birefringence over Er and Tm dual gain bands, overcoming prior trade-offs in fiber design.
研究成果
The proposed double-cladding square lattice photonic crystal fiber successfully overcomes the trade-off between large negative dispersion and high birefringence, achieving record-high values in both Er and Tm gain bands. It offers flexible tunability through parameter adjustments and has potential applications in dispersion compensation, polarization control, and ultrafast laser systems in dual-band optical communications and sensing.
研究不足
The study is theoretical and based on simulations, so practical fabrication challenges, such as achieving precise structural parameters and minimizing losses (e.g., confinement loss, splice loss), are not addressed. The fiber may have high confinement loss (tens of dB/km), limiting its use to short-length applications. Fabrication tolerances for parameters like din are very tight (e.g., within 0.1% variation for optimal performance in Er band).
1：Experimental Design and Method Selection:
The study used a theoretical approach with numerical simulations based on the vectorial finite element method (FEM) and a perfectly matched layer (PML) boundary condition to analyze light guiding properties. The Sellmeier equation was employed to account for material dispersion in fused silica.
2：Sample Selection and Data Sources:
The analysis focused on a proposed double-cladding square lattice photonic crystal fiber structure with specific geometric parameters (e.g., air hole diameters and lattice constants). No physical samples were used; all data were derived from simulations.
3：List of Experimental Equipment and Materials:
No physical equipment was used as it was a theoretical study. The materials considered include fused silica for the fiber core and cladding regions with air holes.
4：Experimental Procedures and Operational Workflow:
The workflow involved designing the fiber structure, setting up FEM simulations in COMSOL Multiphysics, varying structural parameters (Λout, dout, din), solving Maxwell's equations to obtain effective indices, and calculating chromatic dispersion and birefringence using derived formulas.
5：Data Analysis Methods:
Data were analyzed by plotting dispersion and birefringence curves, optimizing parameters for maximum negative dispersion and high birefringence in Er and Tm bands, and comparing results with prior studies.
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