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提出了一种利用取样光栅周期的啁啾平衡切趾取样光栅单信道内直流分量的方法,基于该方法的切趾光栅滤波器具有波长设计灵活不受限于模板周期和只需一次曝光过程、亚微米量级制作精度的优点。利用均匀光栅最大反射率测量模型和零点带宽测量模型得到了实验所使用的载氢光纤紫外光致折射率变化量与曝光时间的关系。在此基础上,利用提出的新方法设计并实验制作了中心反射波长为1549.84 nm,3 dB带宽分别为75 pm和55 pm的两根升余弦切趾光栅滤波器,实验制作与理论设计仿真结果非常接近,成功消除了取样光栅-1级子光栅谱短波长方向处的法布里-珀罗共振现象,得到的光栅滤波器反射谱和透射谱具有良好的对称性,反射谱边带抑制度在20 dB以上。
A method of using the chirp of a sampled grating period to balance the DC component of a single channel of the grating is proposed. The apodizing grating filter based on the method has the advantages of flexible wavelength design without limitation to the template period and only one exposure process, The advantages of sub-micron manufacturing precision. Using the uniform grating maximum reflectance measurement model and the zero-point bandwidth measurement model, the relationship between the amount of UV-induced refractive index change and the exposure time of hydrogen-loaded fibers was obtained. On this basis, two raised cosine apodized raster filters with central reflection wavelength of 1549.84 nm and 3 dB bandwidth of 75 pm and 55 pm are designed and experimentally proposed by the proposed new method. Experimental production and theoretical design simulation results Very close to successfully eliminate the Fabry-Perot resonance phenomenon in the short wavelength direction of the sampled grating-1 sub-grating spectrum. The obtained grating filter has good symmetry of the reflection spectrum and the transmission spectrum, the sideband rejection of the reflection spectrum Above 20 dB.