基于铌酸锂的高阶可调谐布拉格波导光栅特性分析

发布时间：2018-03-25 07:55

本文选题：光栅　切入点：光通信　出处：《激光与光电子学进展》2017年06期

【摘要】：提出了一种可在铌酸锂上利用光刻及钛扩散方法实现高阶可调谐的布拉格波导光栅结构,并对其相关特性进行了分析。分析了占空比、光栅阶数、波导宽度差及外加电压对高阶布拉格波导光栅反射谱特性的影响。结果表明,折射率调制度、最大反射率与零值带宽均随占空比呈周期性变化,中心波长随占空比的增加向长波方向漂移。在各阶光栅均取最佳占空比时,折射率调制度最大;随着光栅长度的增大,最大反射率增大而零值带宽减小。随着波导宽度差的增大,最大反射率及零值带宽均增大,中心波长向长波方向漂移。当外加电压增加时,反射谱谱线形状几乎不变化,中心波长会向长波方向漂移,且呈线性增长趋势。
[Abstract]:A novel structure of high order tunable Bragg waveguide gratings using photolithography and titanium diffusion on lithium niobate is proposed, and its related characteristics are analyzed. The effects of waveguide width difference and applied voltage on the reflectance spectrum of high order Bragg waveguide gratings show that the refractive index modulation, the maximum reflectivity and the zero bandwidth vary periodically with the duty cycle. The central wavelength drifts in the direction of long wave with the increase of duty cycle. When the optimal duty cycle is chosen for each order grating, the refractive index modulation is maximum, and with the increase of grating length, With the increase of waveguide width difference, the maximum reflectivity and zero bandwidth increase, and the center wavelength drifts towards the direction of long wave. When the applied voltage increases, the shape of the reflectance spectrum line almost does not change. The center wavelength will drift in the direction of long wave, and the trend is linear.
【作者单位】：天津理工大学电气电子工程学院;光电器件与通信技术教育部工程研究中心;
【基金】：国家自然科学基金(61377075)
【分类号】：TN256

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