一种新型光纤光栅无啁啾调谐方法

A Novel Fiber Grating Tuning Method without Chirp

分析了基于弹性梁的光纤光栅调谐原理,引入了轴向应变传递系数的概念,提出利用部分纯弯曲调谐方法,可实现光纤光栅宽带无啁啾调谐。在实验中,利用部分纯弯曲调谐法,获得了20.1 nm的光纤光栅无啁啾调谐范围,调谐线性拟合度为0.9996,调谐过程中光栅反射谱的3 dB带宽变化小于0.07 nm,峰值反射率变化小于0.2dB,基本无啁啾现象产生,实验结果和理论分析一致。

In this paper, the principle of fiber Bragg gratings （FBG′s） tuning method based on etastic beam is analyzed, an axiat strain transfer coefficient is introduced, and a wide-band FBG tuning without chirp by the method of part pure bending is proposed. In experiment, the chirp-free tuning wavelength of 20. 1 nm, using part pure bending method was achieved. During the whole tuning process, the linearity was 0. 9996, the 3-dB reflection bandwidth and the reflection index showed little variations less than 0.07 nm and 0. 2 dB, respectively. There was almost no chirp appearing, and the experiment consists with theory analysis well.