多参量可调谐的Bragg波导光栅滤波器设计

张爱玲; 李玉祥

doi:doi:10.3788/gzxb20144308.0823001

光子学报, 2014, 43 (8): 0823001, 网络出版: 2014-09-01

多参量可调谐的Bragg波导光栅滤波器设计

Design of Multi-Parameter Tunable Bragg Waveguide Grating Filter

论文大纲

张爱玲 ^*李玉祥

作者单位

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

光学滤波器光学设计动态光栅铌酸锂电光效应 Optical filters Optical design Dynamic grating Lithium niobate Electro-optic effect

摘要

为了解决基于光纤布喇格光栅和压电陶瓷结构的任意光脉冲整形器在动态调谐时存在不足的问题, 提出并设计了一种波长、相位、幅度参量独立可调的Bragg波导光栅滤波器, 以实现谐振波长及谐振波相位快速独立的线性调控.理论分析表明: 波长和相位的理论调谐效率分别为15.6 pm/V和0.2π/V, 滤波器的输出光强度可以通过偏振旋转器控制.基于转移矩阵理论的仿真分析发现: 该滤波器在蚀刻占空比为1/2时反射率最大, 光栅长度为10.869 mm, 蚀刻深度大于100 nm时, 可以获得98.4%以上的反射率和大于0.14 nm的带宽；增大波长调谐电压会进一步降低滤波带宽.

Abstract

In order to solve the problem of poor tuning performence of the optical arbitrary waveform generator based on fiber Bragg grating and piezoelectric transducer, a novel multi-parameter fast tunable Bragg grating filter on lithium niobate crystal was proposed. Theory analysis shows that its Bragg wavelength and corresponding phase is tunable in a linear way with wavelength tuning efficiency of 15.6 pm/V and phase tuning efficiency of 0.2 π/V, and the output light intensity of the filter is controlled by adjusting a polarization rotator also. Simulation results based on transfer matrix theory show that the maximum filtering reflectivity is achieved with the etching duty cycle 1/2, reflectivity more than 98.4% and bandwidth wider than 0.14 nm is obtained when etching depth is deeper than 100 nm on the condition of 10.87 mm grating length, and increasing the wavelength tuning voltage will further reduce the filter bandwidth.

参考文献

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张爱玲, 李玉祥. 多参量可调谐的Bragg波导光栅滤波器设计[J]. 光子学报, 2014, 43(8): 0823001. ZHANG Ai-ling, LI Yu-xiang. Design of Multi-Parameter Tunable Bragg Waveguide Grating Filter[J]. ACTA PHOTONICA SINICA, 2014, 43(8): 0823001.

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