运用耦合模理论分析长周期光纤光栅(LPFG)的特性, 得出了各物理参数与光栅谱形之间的关系, 并利用MATLAB进行了仿真。基于机械线加工技术制作了周期为600、620和660 μm, 周期数为60、80和90的周期性矩形压力槽, 利用机械微弯原理写制的光栅的最大谐振峰值可达18 dB, 谐振波长可调谐, 透射谱与理论分析吻合。

The properties of Long Period Fiber Gratings (LPFG) are analyzed by applying the coupled-mode theory and the relationship between the physical parameters and the grating spectra obtained and simulated by using Matlab. Periodic rectangular pressure grooves with periods of 600, 620 and 660 μm and period numbers of 60, 80 and 90 are produced on the basis of the mechanical linear processing technology. The maximum resonant peak of the grating fabricated by using the mechanical micro-bending principle can be as high as 18 dB. The resonant wavelength is tunable and the transmission spectra are identical with the theoretical analysis.