17 November 2010 United model of fiber coupler based on variation technique
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For the irregular shape of a fiber coupler, the coupling characteristics of it are usually studied in its different sections separately. It's necessary to build a united model to simulate the coupling characteristics of each section all together. Some appropriate geometrical configurations were employed, and modal field in a coupler was obtained by the weighted superposition of triangular distribution and Gaussian distribution, in the condition of lossless propagation. With that a united model was obtained by the variation technique, combined with the concept of local modes. It's a more refined model, which is available on condition that the core radius in the neck waist is around 1 μm and can provide theoretical guidance for the practical design and fabrication of a fused-tapered single-mode fiber coupler. In its effective area, there is a good agreement between the theoretical result and experimental result.
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Jianguo Ren, Jianguo Ren, Yongming Hu, Yongming Hu, Xueliang Zhang, Xueliang Zhang, Zhengliang Hu, Zhengliang Hu, Yang Liu, Yang Liu, } "United model of fiber coupler based on variation technique", Proc. SPIE 7847, Optoelectronic Devices and Integration III, 784730 (17 November 2010); doi: 10.1117/12.871784; https://doi.org/10.1117/12.871784

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