摘要
设计了具有双峰滤波特性的相移光栅及取样光栅,利用传输矩阵方法对其滤波特性进行了研究。结果表明,多π相移光栅及π相移取样光栅均可获得双峰滤波特性,并且π相移取样光栅比多π相移光栅具有更好的双峰滤波特性,其反射频谱的旁峰幅度比多π相移光栅低得多。调整π相移取样光栅的占空比（取样长度与取样周期的比值）位于0.66-0.8范围内时,得到了更好的双峰滤波特性,特别是占空比为0.75时其旁峰反射率整体上处于最低值。
Phase-shifted fiber Bragg grating and sampled fiber Bragg grating with dual wavelength filtering properties are designed and their properties with transmission matrix method are studied.As a result,both multi-π phase-shifted grating and π phase-shifted sampled grating have dual wavelength reflective profile.Moreover,the side lobe of reflective profile of π phase-shifted sampled grating is lower than that of multi-π phase-shifted grating.By adjusting the duty cycle of π phase-shifted sampled grating in the range of 0.66-0.8,better dual wavelength filtering profile is obtained,especially the side lobe reflective index is lowest when the duty cycle is 0.75.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2010年第11期2896-2900,共5页
Chinese Journal of Lasers
基金
国家自然科学基金(60808004)
天津市科技计划面上资助项目(08JCYBJC14500)
教育部新世纪优秀人才计划(NCET-07-0611)资助课题
关键词
光纤光学
相移光栅
取样光栅
双峰滤波
占空比
fiber optics
phase-shifted grating
sampled grating
dual wavelength filtering
duty cycle
