研究目的
To study the effect of alignment error on the coupling efficiency and beam quality of a Gaussian beam coupled into a large-core multimode fiber.
研究成果
The derived equations for alignment errors are accurate for Gaussian beams, and simulations confirm their validity. Lateral error has the greatest impact on beam power distribution, converting meridian light to skewed light and expanding the power distribution outward. The findings can guide the design and evaluation of large-core multimode fiber couplers.
研究不足
The study ignores effects such as Fresnel reflection, absorption loss, scattering loss, and bend loss, which may affect real-world applications. The assumption that light in the fiber cladding is completely absorbed may not hold in all scenarios, and the use of Gaussian distribution instead of angular Gaussian in some simulations could lead to discrepancies.
1：Experimental Design and Method Selection:
The study involves theoretical derivation of equations for evaluating the effects of longitudinal, lateral, and angular alignment errors on coupling efficiency, followed by simulation verification using ZEMAX software. Assumptions include ignoring Fresnel reflection, absorption loss, scattering loss, bend loss, and complete absorption of light in the fiber cladding.
2：Sample Selection and Data Sources:
Simulations are performed with specific parameters such as fiber core radii (a =
3：1 mm, 3 mm, 5 mm), spot radii (r = 1 mm, 2 mm, 3 mm, 4 mm), and incidences (θIN = 34°, 74°, 1°). List of Experimental Equipment and Materials:
ZEMAX software is used for simulations.
4：Experimental Procedures and Operational Workflow:
Equations are derived based on Gaussian beam theory, and simulations are conducted in ZEMAX using sequential and non-sequential modes to model the coupling process with controlled alignment errors.
5：Data Analysis Methods:
Numerical calculations and simulations are compared for consistency, and results are analyzed to assess the impact on coupling efficiency and beam power distribution.
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