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Research on the influence of alignment error on coupling efficiency and beam quality for Gaussian beam to multimode fiber
摘要： The effect of alignment error on the coupling efficiency and beam quality of a Gaussian beam coupled into a large-core multimode fiber is studied in this paper. The equations for evaluating the effect of alignment error on the coupling efficiency are derived separately, and verified with the method of simulation. The calculation and simulation results obtained are highly consistent. In the same way, the effects of alignment error on the beam power distribution are discussed. The results show that the lateral error will change the path of partial light to a large extent, and have a greater influence on the power distribution of the Gaussian beam than the longitudinal error and angular error do.
关键词： Multimode fiber,Coupling efficiency,Beam quality,Alignment error
更新于2025-09-23 15:23:52
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Modeling and Analysis of the Electro-Optic Modulator With Alignment Errors
摘要： Electro-optic modulators have enabled a wide range of emerging applications that place greater demands on the alignment of the modulators. In this paper, for the ?rst time to the best of our knowledge, we construct a theoretical model to describe the electro-optic modulator with alignment errors, which helps us to quantitatively analyze the distribution characteristics of the exiting intensity of the electro-optic modulator under different alignment errors and different applied voltages. The alignment errors in the theoretical model are divided into three kinds, namely, the horizontal error, the vertical error, and the rotation error. The theoretical results show that the model and the distribution characteristics of the exiting intensity are useful to align the electro-optic modulator precisely in practical applications. Furthermore, an experimental setup is proposed to align the electro-optic modulator based on a lithium niobite crystal and to verify the correctness of the model presented in this paper. An excellent agreement is found between the theoretical results and the experimental results.
关键词： Electro-optic modulator,alignment error,polarization ray tracing
更新于2025-09-16 10:30:52