含涂覆层长周期光纤光栅温度特性研究  

Temperature characteristics of coated long period fiber gratings

作　　者：陆君辉[1] 施解龙[1] 

机构地区：[1]上海大学理学院物理系,上海200444

出　　处：《量子电子学报》2012年第2期247-251,共5页Chinese Journal of Quantum Electronics

基　　金：国家自然科学基金(60808002);上海市重点学科建设项目资助(S30105)

摘　　要：提出在含涂覆层的标准通信光纤中用800 nm红外飞秒激光直接写入长周期光纤光栅(LPFGs)。从理论上分析了光纤涂覆层对于纤芯基模和包层模有效折射率的影响,并进一步研究了涂覆层对LPFGs温度灵敏度的影响。分别对制作的去除涂覆层和含涂覆层LPFGs的低阶包层模进行了温度特性实验。结果表明:涂覆层的存在不仅能成为LPFGs理想的保护层,更重要的是将LPFGs的温度灵敏度提高到0.1173 nm/℃,与理论分析吻合。这种含涂覆层光纤光栅若作为温度传感器,将有着良好的机械强度和温度灵敏度。A method is proposed to directly inscribe long period fiber gratings（LPFGs） in coated standard communication optical fibers by an 800 nm infrared femtosecond laser. Influence of fiber coatings on the effective indices for fundamental core mode and cladding mode was analyzed theoretically, as well as the LPFG＇s temperature sensitivity. Temperature performance of the low-order cladding mode of uncoated and coated LPFGs was tested, respectively. The results show that the presence of coating is not only the desirable protective layer for LPFGs, and most importantly, the LPFG＇s temperature sensitivity is increased to 0.1173 nm/℃, in accordance with the theory analysis. The coated LPFGs, if as temperature sensors, will have a good mechanical strength and temperature sensitivity.

关 键 词：纤维和导波光学 含涂覆层长周期光纤光栅 飞秒激光脉冲 温度特性 

分 类 号：TN253[电子电信—物理电子学]