报道了写于熊猫光纤上的长周期光栅特性的实验研究结果。测得了对应于熊猫光纤两个轴的长周期光栅谐振峰的温度和应变响应系数。结果表明,在所研究的温度和应变测量范围内,温度和应变响应曲线具有良好的线性。快、慢轴谐振峰的温度响应系数及应变响应系数具有相反的符号。还研究了该熊猫光纤长周期光栅的金属化特性,结果表明,在所测量的范围内,谐振峰的波长随所加的功率线性增加, 而谐振峰损耗量的变化小于0.3 dB。基于平板波导耦合理论,对实验中观察到的现象给出了定性的解释。

In this paper, the characteristics of long-period Bragg grating written on panda fiber are presented. Both the strain and temperature responses show a good linear characteristics at the strain range and temperature range investigated. The temperature-tuning characteristics of the long period grating (LPG) by using a thin film metal coating on the nude surface of the fiber as a heater are also demonstrated. In the range of 0～150 mA, the response curve of the LPG has good linearity with the square of the current, while the loss change is less than 0.3 dB.