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运用传输矩阵法对三包层级联长周期光纤光栅(LPFG)的传输谱特性进行分析,讨论了级联处光纤的长度、位置以及薄膜参数等对级联光栅传输谱的影响,并对级联长周期光栅和相移长周期光栅的传输谱进行了比较。结果表明两者传输谱在级联光纤长度较小或级联位置靠近光栅两端时具有较强的一致性;而在级联处光纤较长并且级联位置在中间时,两者表现出截然不同的特性,这一点和两包层级联光栅一致。另外,薄膜参数可以更灵活地调节传输谱衰减峰位置和峰值损耗的大小。
The transmission matrix was used to analyze the transmission spectrum of cascaded long period fiber grating (LPFG). The influence of the length, position and film parameters of cascaded fiber on the transmission spectrum of cascaded gratings was discussed. The transmission spectra of long-period gratings and phase-shift long-period gratings are compared. The results show that the transmission spectra of the two have a strong consistency when the length of the cascaded fiber is small or the position of the cascade is close to the two ends of the grating. When the fiber in the cascade is long and the cascade is in the middle, Different characteristics, which is consistent with the two-layer cascaded grating. In addition, the thin film parameters allow more flexibility in adjusting the position of the attenuation peak of the transmission spectrum and the magnitude of the peak loss.