阵列波导光栅线性系统理论分析及优化设计

运用线性系统理论分析了阵列波导光栅的模场特性 ,导出器件传输的数学模型即光栅方程。提出了设计阵列波导光栅阵列波导数M的新方法 ,该方法综合考虑了降低器件串扰以及收集发散光场的能力 ,与文献 1 ]的方法相比简单且准确。分析了造成器件衍射损耗的原因 ,提出了降低器件衍射损耗的方法。给出了 8× 0 .8nm ,中心波长为 1 550nm的阵列波导光栅波分复用器的设计实例 ,并进行了数值模拟计算验证了文中所提方法的准确性。

Theoretical Analysis of Arrayed-Waveguide Grating As a Linear System and Its Optimal Structure Design

The characteristic of arrayed waveguide gratings is analyzed with the linear systems theory and the optical grating equation is educed. A new method for calculating the number of arrayed waveguide is proposed in consideration of reducing the crosstalk and gathering the radiating beam of light. This method is accurate and simple compared with the method given in Ref.1]. The reason of causing the diffraction loss is analyzed, and the method to reduce the diffraction loss is introduced. As an example, 8×0.8 nm AWG multiplexer is designed with a center wavelength 1550 nm. The accuracy of this methods is proved by numeric model calculation.