设计了一种基于道威棱镜的光传输特性的四通道单模光纤旋转连接器，采用锥齿轮行星轮结构实现光信号的旋转耦合，并设计了耦合调整方案；分析道威棱镜光轴与旋转轴不重合带来的耦合损耗，确定道威棱镜的装调精度。最终使四通道单模光纤旋转连接器的技术指标达到了国外同类产品水平，且道威棱镜的通光孔径大，可在结构尺寸不变的情况下直接扩展为八通道单模光纤旋转连接器。

A four-channel single-mode fiber optic rotary joint is designed, which is based on transmission theory of Dove prism. The optical signal coupling is implemented applying bevel gear. Furthermore, a scheme of the coupling adjusting is designed. The coupling loss is also analyzed, which is brought by the error between optical axis and rotary axis of Dove prism so that the installation precision of Dove prism is confirmed. Finally, the technical indicator of four-channel single-mode fiber optic rotary joint has achieved the level of congener foreign products. And this design can be expanded to eight-channel with primary configuration size by the enough optical aperture of Dove prism.