布拉格光栅结构RGB波导复用/解复用器的光学特性
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上海电子信息职业技术学院 通信与信息工程学院

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TN256

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Optical properties of RGB waveguide multiplexers/demultiplexers with Bragg grating structure
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    摘要:

    具有优良性能的红绿蓝(RGB)三色可见光复用/解复用器是光学显示系统与可见光通信系统的核心部件,承担着调控光传输路径的重要任务。目前,被广泛使用的RGB复用/解复用器主要有棱镜型和光纤型两种,均由分立器件组合而成,不具备可集成性。针对系统小型化和集成化的发展需求,本文提出了一种基于布拉格光栅结构的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/解复用器的性能影响。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:

    A red, green, and blue (RGB) tri-color visible light multiplexer/demultiplexer with excellent performances is the core component in optical display systems or visible light communication systems, undertaking an important task of light path control. At present, the widely used RGB multiplexer/demultiplexer mainly includes two types, one is based on prisms, other is made by fibers. Both types are composed of discrete components, lacking of integration. To satisfy the needs of system miniaturization and integration, we propose a Bragg grating-based RGB waveguide multiplexer/demultiplexer, and systematically study the relationship between tis performances and grating characteristic parameters such as grooving depth,and period number. The results show that a SU-8 RGB multiplexer/demultiplexer 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/demultiplexer 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, our design realizes the RGB multiplexing/demultiplexing, laying a solid foundation for the miniaturization, integration, and flexibility of RGB multiplexer/demultiplexer.

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历史
  • 收稿日期:2021-07-13
  • 最后修改日期:2021-07-13
  • 录用日期:2021-07-28
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