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对串联的长周期光纤光栅(CLPFG)的透射谱特性进行了理论分析和实验研究。分析表明,长周期光纤光栅中纤芯模和包层模之间的马赫曾德尔干涉效应导致在长周期光纤光栅谐振峰内的梳状滤波结构特性;其峰值位置和峰间距同串联区光纤的长度以及光纤的波导色散因子有关。测量了长周期光纤光栅的透射谱,并研究了其温度特性。根据测量数据,得到对应于1554 nm波长处,所用单模光纤HE14模的波导色散因子γ为0.874;纤芯/包层有效折射率差的热光系数为4.8×10-5℃-1。并对这一测试方法和结果,以及长周期光纤光栅的应用进行了讨论。
The transmission spectrum characteristics of series long-period fiber gratings (CLPFGs) are theoretically analyzed and experimentally studied. The analysis shows that the Mach-Zehnder interference effect between the core mode and the cladding mode in long-period fiber gratings leads to the comb filtering structure characteristic in the resonance peak of the long period fiber grating. The peak position and the peak spacing are the same as those of the fiber in the tandem zone Length and fiber waveguide dispersion factor. The transmission spectra of long period fiber gratings were measured and their temperature characteristics were studied. According to the measurement data, the waveguide dispersion factor γ of single-mode fiber HE14 mode corresponding to the wavelength of 1554 nm is 0.874; and the thermal coefficient of the effective refractive index difference of the core / cladding layer is 4.8 × 10-5 ° C -1. This test method and result, as well as the application of long period fiber grating are discussed.