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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420nm/RIU(RIU表示折射率单位)和7.86pm/℃。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。
Long-period gratings (LPGs) are carved by arcing air collapse in the photonic crystal fiber (PCF). On this basis, further analysis of the length of the cycle, the number of cycles, ambient refractive index and temperature on the transmission characteristics of the grating. The results show that the transmission characteristics of the grating prepared by this method change regularly with the number of periods and the number of cycles, and the environmental refractive index sensitivity coefficient and temperature sensitivity coefficient are respectively 420nm / RIU (RIU means refractive index unit) and 7.86pm / ° C. It can be seen that the grating has the characteristics of being sensitive to the change of the refractive index of the environment and less sensitive to the change of the temperature. Therefore, the grating has wide application prospect in reducing the cross-sensing optical fiber sensing device.