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Study on ultralow bending loss of bend-insensitive single mode optical fiber

机译：弯曲不敏感单模光纤超级弯曲损耗研究

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摘要

A novel bend-insensitive single mode fiber is proposed in this paper. A finite element method with a perfectly matched layer boundary is used to analyze characteristics of the mode field distribution, effective area and bending loss. To achieve the proposed fiber with a low bending loss, a symmetrical distribution of air holes on a doped trench is designed. The effects of structural parameters on the bending loss and effective area are discussed. The numerical results show that this structure can achieve a low bending loss and effective model area with smaller bend radius at a wavelength of 1550 nm. The bending loss is only 2.13 x 10(-5) dB/m and the mode field diameter (MFD) is 8.71 mu m, which can provide a good match with the single mode fiber (SMF). The simulation results show that the existence of air holes in the trenched layer can exist minimum point of bending loss with increasing the values of c, which is different from previous studies. Compared with a single mode fiber-28 (SMF-28) and a trench-assistant fiber (TAP), this structure still has an ultralow bending loss and a smaller effective area with a low-bend radius of 3 mm at a wavelength of 1550 nm. The proposed fiber may be preferable for optical connection.
机译：本文提出了一种新型弯曲不敏感的单模光纤。具有完美匹配的层边界的有限元方法用于分析模式场分布，有效面积和弯曲损耗的特性。为了实现具有低弯曲损耗的提出的纤维，设计了掺杂沟槽上的空气孔的对称分布。讨论了结构参数对弯曲损耗和有效面积的影响。数值结果表明，该结构可以实现低弯曲损耗和有效模型区域，其波长为1550nm的较小弯曲半径。弯曲损耗仅为2.13 x 10（ - 5）db / m，模式场直径（mfd）为8.71 mu m，可以提供与单模光纤（SMF）的良好匹配。仿真结果表明，挖沟层中的空气孔的存在可以存在最小的弯曲点，随着与先前研究不同的C.与单模光纤-28（SMF-28）和沟槽辅助纤维（TAP）相比，该结构仍然具有超级弯曲损耗和具有3mm的低弯曲半径为1550的低弯曲半径的较小有效区域纳米。所提出的纤维可以优选用于光学连接。

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