摘要
利用模式耦合理论,对长周期光纤光栅透射谱谐振波长的温度特性进行了理论分析和数值模拟.结果表明,可以通过选择具有合适纤芯与包层热光系数匹配的光纤,从而制作出谐振波长对温度变化敏感或者不敏感的长周期光纤光栅;采用高频CO2激光脉冲三束对称写入法制作长周期光纤光栅,并进行温度特性测试,结果表明,谐振波长具有线性响应的温度特性,灵敏度约为0.088nm/℃,而峰值损耗对温度不敏感,起伏不超过0.5dB.
The temperature characteristics of resonant wavelength of long-period fibre gratings are theoretically analysed and numerically simulated by using coupled-model theory. The results show that different LPFGs, whose resonant wavelengths are sensitive or insensitive to the change of temperature, can be made by using different fibres with suitable thermooptic coefficients of core and cladding. The long-period fibre gratings we use are written symmetrically by three-beam focused high-frequency CO2 laser pulses, and the temperature characteristics of that are tested. The experimental results show that resonant wavelength is linear with temperature, with the sensitivity of 0. 088 nm/℃. The altitude of peak loss is insensitive to the change of temperature, with shifting within the altitude of 0. 5 dB.
出处
《传感技术学报》
CAS
CSCD
北大核心
2007年第3期543-545,共3页
Chinese Journal of Sensors and Actuators
基金
国家自然科学基金海外青年合作基金资助(60028505)
