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在AWG器件的设计中引入了抛物线型的楔形波导结构,根据过渡区理论优化了引入的抛物线型楔形结构的形状和尺寸.采用抛物线型楔形结构代替直线型楔形结构,AWG的插入损耗降低了2 dB左右.在优化参数时使输出/输入波导间距与阵列波导间距取不同的值,并使输出/输入波导间距适当增大,而阵列波导间距取较小值,这样使得串扰降至-30 dB以下且插入损耗保持在低水平.运用光束传播方法给出器件的输出光谱并证实了理论上预想的结果.
In the design of AWG device, a parabolic wedge waveguide structure is introduced, and the shape and size of the parabola wedge structure are optimized according to the transition zone theory. The parabolic wedge structure instead of the linear wedge structure reduces the insertion loss of the AWG by 2 dB or so. Optimize the parameters by taking different values for the output / input waveguide spacing and the arrayed waveguide spacing, and by appropriately increasing the output / input waveguide spacing and the smaller arrayed waveguide spacing, resulting in a reduction of crosstalk to -30 dB And the insertion loss was kept low.The output spectrum of the device was given using a beam propagation method and confirmed the theoretically expected result.