研究目的
Analyzing the optimal coupling conditions of the few-mode fiber-based free space optical communication receiver to improve the performance of the receiver.
研究成果
Few-mode fibers offer promising properties for the further development of free-space optical communication systems with higher capacity and data transmission rate. The simulation results show that with a larger few-mode fiber diameter, the optimal focal ratio remains relatively constant. The coupling efficiency of the few-mode fiber is less sensitive to central occlusion than that of the single-mode fiber.
研究不足
The study is theoretical and does not account for practical implementation challenges such as alignment errors, environmental factors, or manufacturing imperfections in fibers and lenses.
1：Experimental Design and Method Selection:
A coupling efficiency model is established to evaluate the coupling efficiency of space light to few-mode fiber. The model analyzes the dependence of the coupling efficiency on the focal ratio, the central occlusion ratio, and the numerical aperture.
2：Sample Selection and Data Sources:
The study uses theoretical models and simulations to analyze the coupling conditions without specifying physical samples or datasets.
3：List of Experimental Equipment and Materials:
The study does not specify particular equipment or materials used, focusing instead on theoretical analysis.
4：Experimental Procedures and Operational Workflow:
The study involves calculating the coupling efficiency based on the electric field distribution of the focused spot and the fiber modes, using Fresnel diffraction integral formula and Bessel functions.
5：Data Analysis Methods:
The analysis involves comparing the coupling efficiency under different conditions (focal ratio, central occlusion ratio, numerical aperture) to determine optimal coupling conditions.
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