通过电弧放电在光子晶体光纤(PCF)中产生空气孔塌缩来刻入长周期光栅(LPG)。在此基础上进一步分析其周期长度、周期个数、环境折射率和温度对该光栅传输特性的影响。研究结果表明，该方法制备的光栅的传输特性随周期长度和周期个数有规律地变化，并测得其环境折射率灵敏度系数和温度灵敏度系数分别为 420 nm/RIU(RIU表示折射率单位)和7.86 pm/℃。由此可见，这种光栅具有对环境折射率的变化敏感而对温度的变化较不敏感的特性，因而在减少交叉敏感的光纤传感器件方面有广泛的应用前景。

The method of fabricating structural long period grating (LPG) in a photonic crystal fiber (PCF) with periodically collapsed holes along the length of the fiber by use of arc discharge is proposed. The influence of the fiber structural parameters, involving the grating period, the number of periods, the refractive index and temperature, on transmission characteristics is further studied. The research results indicate that the transmission characteristics of the manufactural LPG can be tuned by the grating period and the number of periods regularly. The refractive sensitivity and the temperature sensitivity are 420 nm/RIU (RIU is refractive index unit) and 7.86 pm/℃, respectively, which is found to be highly sensitive to refractive index while weakly sensitive to temperature. These unique properties can bring many potential applications in the field of optical fiber sensor with largely reduced cross-sensitivity.