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通过在长周期光纤光栅(LPG)上某个位置引入一段衔套调制结构,设计并研制出了一种新型相移长周期光纤光栅(PSLPG),并采用传输矩阵法模拟了其光谱特性。模拟结果表明:在LPG某点引入衔套调制结构,当衔套调制结构都为均匀短光栅,且与被调制光栅的折射率调制深度相同但周期不同时,所形成的光栅仍旧可等效为一个单PSLPG,而引入相移量的大小相当于两个调制结构的分别引入相移量之和。最后采用CO2激光单侧曝光法写制技术对引入衔套调制结构形成的PSLPG进行了写制,实验结果与理论分析相符。
A novel phase-shift long-period fiber grating (PSLPG) was designed and developed by introducing a modulation structure of the end-cap at a certain position on a long-period fiber grating (LPG). The transmission matrix method was used to simulate its spectral characteristics. The simulation results show that when the modulation structure of the headbox is introduced at a certain point of the LPG, the grating formed when the modulation structure of the headbox is a uniform short grating and the modulation depth of the modulated grating is the same but the period is different, can still be equivalent to A single PSLPG, and the introduction of the amount of phase shift is equivalent to the size of the two modulation structures were introduced into the sum of the amount of phase shift. Finally, CO2 laser unilateral exposure method was used to write the PSLPG which was formed by the modulation structure of the headgear. The experimental results are consistent with the theoretical analysis.