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增加光栅长度是获得具有低插入损耗、高边带抑制度的超窄带光栅滤波器最佳途径。但是长光栅的制作方案会引入比较严重的相位误差,严重影响到光栅滤波器的性能;取样光栅的设计制作方案具有滤波中心波长设计灵活、制作精度低和切趾技术实现容易的优点。针对利用取样光栅制作超窄带光栅滤波器的方案,分析了3种常见相位误差对—1级子光栅滤波性能的影响;利用重构等效嘣啾技术(REC)成功补偿了光栅长度为6.6 cm的超窄带取样光栅滤波器—1级子光栅的相位误差,并得到了反射谱和透射谱对称性良好。3 dB带宽为26 pm,20 dB带宽为70 pm,插入损耗为1.25 dB和边带抑制度为21.55 dB的超窄带光栅滤波器。
Increasing the grating length is the best way to obtain an ultra-narrowband grating filter with low insertion loss and high sideband suppression. However, the fabrication scheme of the long grating will introduce more serious phase errors, seriously affecting the performance of the grating filter. The design of the sampling grating has the advantages of flexible design wavelength center, low fabrication precision and easy apodization. For the scheme of making super-narrowband grating filter by sampling grating, the influence of three kinds of common phase errors on the performance of -1st-level sub-grating is analyzed. The grating length is 6.6 cm with the reconstruction equivalent chirp (REC) The phase error of the super-narrowband sampling raster filter -1 order sub-grating is obtained, and the symmetry of the reflection and transmission spectra is obtained. 3 dB bandwidth of 26 pm, 20 dB bandwidth of 70 pm, insertion loss of 1.25 dB and sideband suppression of 21.55 dB ultra-narrowband grating filter.