提出一种新的多级联线性啁啾光纤光栅密集梳状滤波器,该结构由多个相同的线性啁啾光纤光栅(LCFBG)组成,并对其光谱特性进行了模拟和分析。研究表明,滤波通道间隔由单元光栅构成的法布里-珀罗(F-P)谐振腔的长度确定,通过选择合适的光栅总啁啾量、光栅折射率调制深度和光栅级联数,可以获得反射率高、响应谱宽的多通道滤波效果。采用多级联方式,在较小折射率调制深度的情况下,可以实现高反射率,降低了通常对光栅折射率调制深度的要求。该结构由相同的线性啁啾光纤光栅级联而成,可以采用同一个光栅模板制作,容易实现。 A new multi-cascaded linear chirped fiber grating dense comb filter is proposed, which consists of a plurality of identical linear chirped fiber gratings (LCFBGs), and their spectral characteristics are simulated and analyzed. The results show that the filter channel spacing is determined by the length of the Fabry-Perot (FP) resonator composed of the unit grating. Reflectance can be obtained by selecting the appropriate total grating chirp, the grating refractive index modulation depth and the grating cascade number Multi-channel filter with high response rate and wide spectrum response. With cascade connection, high reflectivity can be achieved with a smaller depth of modulation of the modulation, reducing the usual requirement for the depth of the grating’s refractive index modulation. The structure of the same linear chirped fiber grating cascaded, can be produced using the same grating template, easy to implement.