布拉格光栅结构RGB波导复用/解复用器的光学特性

Optical Properties of RGB Waveguide Multiplexers/Demultiplexers with Bragg Grating Structure

摘要:

针对系统小型化和集成化的发展需求,文章提出了一种基于布拉格光栅结构的红绿蓝(RGB)波导复用/解复用器,系统研究了刻槽深度、周期数量等光栅特征参数对该复用/解复用器性能的影响。研究表明,相对于传统的硅基材料,基于SU8材料的复用/解复用器具有良好的透过率和柔韧性,并且其结构紧凑,波导横截面只有几百纳米,长度仅为几十微米。该复用/解复用器的光学特性主要受到刻槽深度与周期数量的影响,表现为随刻槽深度的增大,反射谱的中心波长先红移后蓝移,反射谱的宽度几乎正比例增大,反射谱的峰值逐渐趋于饱和；而随着周期数量的增多,反射谱的宽度变化不明显,反射谱的峰值逐渐趋于饱和。基于这些特性设计的SU8材料布拉格光栅结构RGB复用/解复用器实现了复用和解复用的功能,为RGB复用/解复用器的小型化、集成化和柔性化奠定了基础。

Abstract:

To satisfy the needs of system miniaturization and integration, a Bragg grating-based RGB waveguide multiplexer/de-multiplexer was proposed, and the relationship between its performance and grating characteristic parameters such as grooving depth and period number were systematically studied. The results show that a SU-8 RGB multiplexer/de-multiplexer has a compact structure with cross section of only a few hundred nanometers and a length of dozens of microns, and exhibits better transmittance and flexibility than a traditional silicon materials component. The optical properties of the RGB multiplexer/de-multiplexer are mainly affected by its grooving depth and period number. With increase of the groove depth, the central wavelength of the reflection spectrum exhibits red shift first and blue shift later, the width of the reflection spectrum increases almost directly, and the peak value of the reflection spectrum tends to saturate gradually. However, with the increase of the period number, the width of the reflection spectrum does not change significantly, and the peak value of the emission spectrum tends to saturate gradually. Based on such characteristics, the proposed design realizes the RGB multiplexing/de-multiplexing, laying a solid foundation for the miniaturization, integration, and flexibility of RGB multiplexer/de-multiplexer.