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长周期光纤光栅的级联光谱特性研究
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Abstract:
基于耦合模理论利用传输矩阵法研究级联长周期光纤光栅(Cascaded Long Period Fiber Gratings, CLPG)的光谱特性。结果表明：选用两个参数相近的长周期光纤光栅(Long Period Fiber Gratings, LPG)级联可以获得更明显的透射谱。周期的增加导致损耗峰向长波方向线性漂移，可据此实现对特定波长的损耗。长度和折射率调制深度主要影响损耗峰深度，可以用于调控损耗峰出现极深值点。得到当两个级联LPG的周期为500 μm、长度为3 cm，折射率调制深度为0.00014时存在窄而深的最优CLPG损耗峰。该研究结论为分析级联长周期光纤光栅理论和改进传感器件设计应用提供了依据。
Based on the coupled-mode theory, the spectral characteristics of CLPG are studied by using the transfer matrix method. The results show that a more obvious transmission spectrum can be obtained by selecting two LPG cascades with the same parameters. The increase of the period leads to the linear shift of the loss peak to the long wave direction, which can realize the loss of a specific wavelength. Length and refractive index modulation depth mainly affect the peak depth, which can be used to control the extremely deep point in the loss peak. The simulation shows when the period of two cascaded LPG is 500 μm, the length is 3 cm, and the refractive index modulation depth is 0.00014 the narrow and deep optimal CLPG loss peak is obtained. This research provides a basis for the theory of CLPG and improves the design and application of sensing devices.
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