基于透镜组的新型双通道光纤旋转连接器

针对现有双通道光纤旋转连接器(FORJ)所存在的问 题,提出了一种基于透镜组合系统的 新型双通道FORJ。其中心通道由两光纤准直器直接对准耦合而成,旁轴通道通过透镜组的圆 对称性实现旁轴通道光信号的连续 传输。旁轴通道是这种FORJ设计的关键,利用几何光学定律,通过光线追击法计算了 旁轴通道在准直器和大 芯径光纤分别作接收器下FORJ的光路图。最后测试了双通道FORJ的性能参数,实验结果表明 ,所提出的FORJ中心通道最大插入损耗为1.84dB,旋转变化量小于 0.59dB,回波损耗大于40dB；旁轴通道最大 插入损耗为2.40dB,旋转变化量小于0.76dB ,回波损耗大于45dB,完全可以满足双通道器件性能要求。

A novel dual-channel fiber optic rotary joint based on lens system

In order to solve the existing problems of dual-channel fiber optic r otary joint (FORJ),a novel dual-channel FORJ based on lens group system is pres ented in this paper.The central channel of the dual-channel FORJ consists of two fiber collimators,where the optical signals can be transmitted by means of direct coupling;the optical signals in the off-axis channel can be continuou sly transmitted by the circular symmetry of the lens group system.It is important to note that the design of the off-axis chan nel is the key problem to establish the dual-channel FORJ.The optical systems of this FORJ using the optical collima tor and the large- core fiber as receiver are analyzed by ray tracing based on the geometric optics law,respectively.In addition,the performance of the dual-channel FORJ is investigated.The experimental results s how that the insertion loss of the central channel is less than 1.84dB,and the loss due to t he rotation is about 0.59dB;the maximum insertion loss of off-axis channel is 2.40dB and the loss due to the r otation is less than 0.76dB.The return losses of central channel and off-axis channel are 40dB and 45dB,respectively .The performance can meet the requirement of this kind of FORJ.