写于载氢光纤上的长周期光纤光栅经过高温退火后 ,对其进行紫外均匀曝光能够有效改变其耦合特性。随着曝光量的增加 ,其共振波长向长波方向移动 ,共振峰强度先增大继而减小。并对此给出了理论解释。 Long-period fiber gratings written on hydrogen-doped fibers can be effectively UV-exposed by high-temperature annealing. With the increase of exposure, the resonance wavelength moves to the long-wave direction, and the intensity of the formant firstly increases and then decreases. And gives a theoretical explanation.