【摘要】 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。更多还原

【Abstract】 We propose a new method to design a phase-shifted long period grating(PSLPG) by adding an embedded-modulation structure in a long period grating at some position.The spectral characteristics are obtained by the transfer matrix simulated approach.The studies show that when a uniform short grating embedded-modulation structure,which has the same modulated depth but different period with the original one,is added in a long period grating,the grating also could be seen as a single phase-shifted long period gating,and the magnitude of phase-shifting is the sum of the two modulation structures in the embedded-modulation structure.Furthermore,we fabricated the embedded-modulation PSLPG by CO2 laser exposure,and the experiment agrees well with the theory.更多还原