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通过对长周期光纤光栅模式耦合机理和长周期光纤光栅透射谱特点的详细分析,给出了仿真薄膜长周期光纤光栅透射谱的解决方案。该方案从大量的波长抽样点中选择那些对耦合有贡献的抽样点来计算,并且对每一抽样点只计算最有效的模次的耦合,可以在保证模拟的正确性的前提下最大限度地减少长周期光纤光栅透射谱仿真的计算量。以振幅掩模法(芯层折射率分布近似为矩形分布)写制的薄膜长周期光纤光栅进行了数值研究,研究中考虑了材料色散对导模和包层模式折射率的影响。研究结果表明,该方案能极大提高仿真速度。
By analyzing the mode coupling mechanism of long period fiber grating and the transmission spectrum of long period fiber grating, the solution to simulate the transmission spectrum of long period fiber grating is given. The scheme chooses the sampling points that contribute to the coupling from a large number of wavelength sampling points and calculates only the most efficient coupling of the modes at each sampling point to ensure that the simulation is correct to the maximum extent Reduce the computational complexity of the transmission spectrum simulation of long period fiber gratings. A thin-film long-period fiber gratings written by the amplitude mask method (the refractive index distribution of the core is approximately a rectangular distribution) are numerically investigated. The influence of material dispersion on the refractive index of the guided mode and cladding mode is considered. The results show that this scheme can greatly improve the simulation speed.