利用光纤准直器的特殊分布, 设计出了一种新型的离轴双向传输旋转结构。该光纤旋转连接器具有两个可绕一共轴相互独立旋转的部件, 在一个旋转部件上离旋转轴等距处安装四个光纤准直器, 在另一个旋转部件上安装两个光纤准直器, 两部件上的光纤准直器在旋转过程中始终保持光耦合, 从而实现了光信号能在旋转过程中不间断的双向传输。通过分析从光纤准直器出射的光斑功率分布和系统旋转的损耗值, 在进一步提升机械性能和光耦合效率的基础上, 实现了高质量的图像和视频信号传输。实验结果表明, 在旋转部件间距小于500mm和转速小于120r/min的条件下, 系统满足1.25Gbit/s的高速率光信号的稳定传输。

An off-axis fiber-optic rotary joint is designed with the special layout of fiber collimators. The fiber-optic rotary joint has two organs which are able to rotate independently on a common axis. Four fiber collimators are mounted on one organ and two fiber collimators are mounted on the other organ, they must keep optical coupling to realize bidirectional transmission of the optical signal in the rotating process. With the analysis of optical power of the optical signal which transferred from the fiber collimator and the total loss of the system in the rotating process, and by improving the mechanical properties and the optical coupling efficiency, the high-quality transmission of image signal and video signal is realized. The experiment results show that optical signal in high transmission rate of 1.25 Gbit/s can be sent and received stably by the system while the distance between two rotating cylindrical parts is less than 500 mm, and the rotation speed is less than 120 r/min.