电控可调谐的正交偏振双波长滤波器的设计  

Design of Electrically Controlled Double Wavelength Orthogonal Polarization Tunable Filter

作　　者：张爱玲[1,2] 何培栋 潘洪刚[1,2] 闫广拓 孙钦芳 

机构地区：[1]天津理工大学计算机与通信工程学院,天津市薄膜电子与通信器件重点实验室,天津300384 [2]教育部通信器件与技术工程研究中心,天津300384

出　　处：《激光与光电子学进展》2015年第7期245-250,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61377075)

摘　　要：设计了一种基于铌酸锂晶体的电控可调谐波导光栅双波长滤波器。在可同时传输横电波(TE)和横磁波(TM)模式的钛扩散波导上刻写布拉格光栅,能够实现正交偏振的双波长滤波。利用铌酸锂的电光效应改变波导的有效折射率,可以实现两个布拉格波长的快速调谐。对波导光栅滤波性能的分析结果表明,蚀刻光栅在蚀刻坡度小于15°,蚀刻占空比为1/2时,滤波特性最好,且随着蚀刻深度的增加,光栅的反射率与带宽均增加。通过横向电场对波导光栅进行调谐,双波长滤波器的TE模式调谐灵敏度达到15.6 pm/V,TM模式的达到5.5 pm/V。An electrically controlled double wavelength tunable filter based on lithium niobate （LN） is designed. Double wavelength of orthogonal polarization filter is achieved by etching Bragg grating on the Ti-diffusion LN waveguide, which supports transverse electric （TE） mode and transverse magnetic （TM） mode. The refractive index distribution and therefore the Bragg wavelength can be fast tuned by using electrooptic effect in LN. The performance of waveguide grating filter is analyzed and results show that the grating with 1/2 etching duty cycle and less than 15°etching angle has the best filter characteristic. The reflectivity and bandwidth increase with the etching depth increasing. Double wavelength filter achieves 15.6 pm/V sensitivity for TE mode, 5.5 pm/V sensitivity for TM mode by adding the transverse electric field on waveguide grating.

关 键 词：光通信 光学滤波器 动态光栅 电光效应 铌酸锂 

分 类 号：O436.4[机械工程—光学工程]