利用飞秒激光逐线刻写方式在HI1060光纤中制作谐振波长为1548.5 nm,谐振强度为7 dB,栅区长度为3.2 mm的长周期光纤光栅.通过纤芯错位熔接方法在HI1060光纤中制作马赫曾德-干涉仪(MZI),对LPFG的透射光谱进行滤波优化.设计使用不同折射率的酒精溶液、氯化钠溶液和蔗糖溶液分别对基于MZI滤波的LPFG的折射率特性进行了测试和研究.实验中随着三种溶液折射率增加,LPFG的谐振波长发生红移,该LPFG在酒精溶液、氯化钠溶液和蔗糖溶液中的折射率灵敏度分别为301.78 nm/RIU、138.80 nm/RIU和132.67 nm/RIU.%Long period fiber grating(LPFG) was fabricated by using femtosecond laser with line-by-line method in HI1060 fiber.For this LPFG,the resonance wavelength is 1548.5 nm,the resonance intensity is 7 dB,and the length of the grating region is only 3.2 mm.The Mach-Zehnder interferometer(MZI) has been fabricated in HI1060 fiber by core-offset splicing method,and the transmission spectrum of LPFG has been optimized by MZI.The refractive index properties of LPFG were tested and studied by using alcohol solution,NaCl solution,and sucrose solution with different refractive indexes.In the experiment,the resonance wavelength shifts toward long wavelength with the increase of three kinds of solution refractive indexes.The refractive index sensitivities of three different solutions is 301.78 nm/RIU,138.80 nm/RIU and 132.67 nm/RIU respectively.
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