We investigated the influence of a high-power optical transmission on an optical connector by focusing on the fiber withdrawal phenomenon. Along with the curvature radius and the convex vertex eccentricity, fiber withdrawal is one of the key factors in obtaining good connections in single-core optical connectors that use a cylindrical ferrule. When the fiber fixed to the ferrule by adhesive, fiber withdrawal is generated by creep as the adhesive undergoes shear due to the temperature increase of the optical connector. In this paper, we examine the relationship between the optical loss power and fiber withdrawal in order to clarify the conditions leading to fiber withdrawal during high-power optical transmission. We confirm that the shear stress created by the axial compressive force deliberately imposed to achieve reliable physical contact in the optical connector greatly encourages fiber withdrawal. In addition, we clarify that fiber withdrawal under high-power optical transmission depends significantly on the initial fiber position in the connector plug, regardless of the connector temperature increase. We also investigate the long-term reliability of optical connectors for high-power optical transmission. We subject optical connectors to 90 °C, which corresponds to the glass transition temperature of the adhesive, for 500 hours, and measure the optical and mechanical properties. The measured values of both properties remain excellent, and we clarify that although some slight fiber withdrawal occurs during high-power optical transmission, optical connectors with zirconia ferrules do not allow the transmission performance to degrade.

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高功率光传输对光连接器退纤影响的研究


我们通过关注光纤退出现象来研究高功率光传输对光连接器的影响。与曲率半径和凸顶点偏心率一样，光纤抽出也是使用圆柱形插芯的单芯光连接器获得良好连接的关键因素之一。当光纤通过粘合剂固定到插芯上时，由于光连接器的温度升高，粘合剂受到剪切，从而因蠕变而产生光纤拔出。在本文中，我们研究了光损耗功率与光纤退出之间的关系，以阐明在高功率光传输过程中导致光纤退出的条件。我们确认，为了在光连接器中实现可靠的物理接触而故意施加的轴向压缩力所产生的剪切应力极大地促进了光纤的退出。此外，我们澄清，高功率光传输下的光纤退出很大程度上取决于连接器插头中的初始光纤位置，而与连接器温度的升高无关。我们还研究了用于高功率光传输的光连接器的长期可靠性。我们将光学连接器置于 90°C（相当于粘合剂的玻璃化转变温度）下 500 小时，并测量光学和机械性能。这两种性能的测量值仍然非常出色，并且我们澄清，尽管在高功率光传输过程中会出现一些轻微的光纤拉拔，但采用氧化锆插芯的光连接器不会让传输性能下降。