多级联线性啁啾光纤光栅梳状滤波器的优化设计  

Design of Optical Comb Filter with Multi-Concatenated Linearly Chirped Fiber Gratings

作　　者：马伟涛[1] 周骏[1] 徐铁峰[2] 张玲芬[1] 苑红伟[3] 

机构地区：[1]宁波大学理学院物理系,浙江宁波315211 [2]宁波大学信息科学与工程学院电子与电气工程系,浙江宁波315211 [3]江苏大学机械工程学院光信息科学与技术系,江苏镇江212013

出　　处：《中国激光》2010年第5期1284-1289,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(60677015;60977048);浙江省"钱江人才"项目(2007R10015);宁波市重点实验室基金(2007A22006);宁波市自然科学基金(2008A610001);浙江省教育厅科研项目(20070971)资助课题

摘　　要：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 novel optical dense comb filter is proposed,which is composed of many identical linearly chirped fiber Bragg gratings（LCFBG）.The spectral characteristics of optical dense comb filter are numerically simulated and analyzed.The results show that the channel spacing of filter is controlled by the length of Fabry-Perot（F-P） cavity which is equal to that of unit grating.By choosing optimal structure parameters of grating,for example,the total chirp,the index modulation depth of unit grating and the concatenated grating number,the reflection spectrum of the filter shows the characteristics of high reflectivity,large bandwidth and multi-channels.For the multi-concatenated gratings,which are easy to be made with a single grating mask,the high reflection of filter can be achieved with a low index modulation depth.

关 键 词：光纤光栅 啁啾光纤光栅 梳状滤波器 法布里-珀罗谐振腔 

分 类 号：TN929.11[电子电信—通信与信息系统]