光子晶体光纤轴向方位角的确定在光纤器件的加工制作中具有重要的意义.采用平行光侧向照射光子晶体光纤,研究了六边形结构、混合结构以及大模场结构这三种光子晶体光纤,获取其在不同轴向方位角时的侧视光强图像.随着光纤绕轴向旋转,其光强图像出现特定的亮纹光强特征,通过分析得到亮纹光强特征值随光纤轴向旋转之间的变化关系,发现其透射光强图像的光强特征值呈现周期性变化,并与光纤空气孔结构有一定对应关系.采用Tracepro仿真模拟三类光子晶体光纤的侧视光强图像特征,在模拟侧视光强图像中,也出现随轴向旋转变化而变化的亮纹特征,模拟侧视光强亮纹变化特征与实验亮纹特征具有相似的变化规律.对比光子晶体光纤亮纹光强特征值随轴向方位角变化关系的实验曲线与模拟曲线,发现当光源平行于光纤空气孔构成的近似六边形结构的顶角连线照射时,其亮纹光强特征值出现极大值,可以实现光子晶体在特定轴向方位角的定位. The determination of axial azimuth of photonic crystal fiber is of great significance in the fabrication of optical fiber devices.Using parallel photons to irradiate photonic crystal fibers, the photonic crystal fibers with hexagonal structure, mixed structure and large mode-field structure are studied. Optical fiber to obtain its side axial intensity images at different axial azimuths.With the axial rotation of the optical fiber, the light intensity of the image appears a certain light intensity characteristics of the light intensity, through the analysis, The results show that the characteristic value of the intensity of the transmitted light image changes periodically and has a certain correspondence with the air hole structure of the optical fiber. Traceproperties of three types of photonic crystal fibers In the simulation of side-view light intensity images, the features of bright lines also changed along with the axial rotation changes, and the change pattern of simulated bright lines with similar intensities was similar to that of the experimental light patterns.Compared with photonic crystal fiber The experimental curves and simulated curves of the characteristic values ​​of light intensity with axial azimuth change show that when the light source is parallel to the apex of the approximate hexagonal structure formed by the air holes of the optical fiber When the line is illuminated, the maximum value of its light intensity feature value appears, which can realize the positioning of the photonic crystal in the specific axial azimuth.