一种新颖的光纤光栅温度调谐装置的原理与实验研究

Research on a novel fiber Bragg grating thermal tuning scheme

提出了一种新颖的光纤光栅温度调谐方案 ,并将按此方案制作的调谐装置命名为双肩梁 ,详细分析了其原理 .设计制作了一套双肩梁调谐装置 ,并对其进行了实验研究 .实验中得到了 0 4 36nm ℃的温度调谐效率 ,把所用光纤光栅的温度灵敏度提高了 5 0倍之多 .调谐具有很好的线性和可重复性 .该装置最大的优点在于它突破了以往热调谐方法中驱动材料热膨胀系数的限制 ,使得温度调谐效率可以根据实际需要进行灵活设计 ,从而具有很大的灵活性 .该装置在激光器调谐。

A novel fiber Bragg grating thermal tuning scheme is proposed,theoretically analyzed and experimentally studied. The device made from this scheme is named double-shoulder beam (DSB). Experimental results demonstrate that DSB is an effective thermal tuning technique. A thermal sensitivity of 0 436?nm/℃,50 times that of the bare fiber grating,is experimentally achieved. To our knowledge,this is the largest thermal sensitivity ever demonstrated. The repeatability and linearity of the technique is very well. The most important advantage of DSB,as a breakthrough to conventional thermal tuning technique,is its great flexibility. It makes the thermal-tuning efficiency of fiber grating no longer limited by the thermal-expansion coefficient of the drive materials,but can be designed according to practical requirements. This technique is expected to have a vast application in fields such as laser tuning,high sensitivity temperature sensing, sensor demultiplexing and so forth.