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提出在阵列波导光栅(AWG)中采用光学非对称平板波导,以消除嵌入半波片的阵列波导光栅中残留偏振敏感性的解决方案。利用传输函数分析在阵列波导中间插入半波片的偏振模式转换过程;以工艺误差使半波片位置不能居中的情形为实例,利用材料的热光效应,调节输入、输出平板波导的双折射率,形成光学非对称平板波导,从而消除了残留的偏振敏感性。针对聚合物材料AWG的模拟结果显示,当输入、输出平板波导的温度差为24°C时,已可消除32.43 pm的残留偏振敏感性。进一步研究发现,当输入与输出平板波导温度改变量相等但符号相反时,能够很好地避免因温度改变而引起的中心波长漂移。该方法具有结构简单、温控可调等优点,而且还可弥补其他因素造成的因嵌入半波片产生的残留偏振敏感性。
A solution to the residual polarization sensitivity in arrayed waveguide gratings embedded in half-wave plates is proposed using an optically asymmetric slab waveguide in arrayed waveguide gratings (AWGs). The transmission function was used to analyze the polarization mode conversion process of the half-wave plate inserted in the arrayed waveguide. Taking the case of process error that the position of the half-wave plate can not be centered, an example was taken to adjust the input and output birefringence , Forming an optically asymmetric slab waveguide, thereby eliminating the residual polarization sensitivity. Simulation results for the AWG polymer material show that residual polarization sensitivity of 32.43 pm can be eliminated when the temperature difference between the input and output slab waveguides is 24 ° C. Further study found that when the input and output slab waveguide temperature change equal but opposite signs, can be well avoided due to temperature changes caused by the center wavelength shift. The method has the advantages of simple structure and adjustable temperature control, and can also make up for the residual polarization sensitivity caused by other factors due to the embedded half-wave plate.