一种基于光学偏置的新型Math—Zehnder调制器结构设计

设计了一种基于光学偏置并以有机聚合物PMMA／DRI作为光波导材料的新型Mach-Zehdner调制器。利用有效折射率法（EIM），分析了脊波导的有效折射率随脊波导结构参数变化情况，包括脊宽训、脊高b和芯层厚度d，以及上下包层厚度。采用微带线单电极调制方式结合脊波导的结构设计，实现了微波和光波的速率匹配。针对优化的结构参数，采用BPM方法进行光场和功率传输的模拟仿真，完成了非等臂Math—Zehnder调制器的结构设计，实现了两臂89．84。的初始相位差，消光比约为27dB。

A New Type of Mach-Zehnder Modulator Based on Optical Bias

A new type of Mach Zehnder modulator based on optical bias is designed, and the organic polymer DR1/PMMA is chosen as the ridge waveguide material. Variations of the effective indexes with the structure parameters which include the width w, the height b, the thickness of core waveguide d and the thickness of upper and lower cladding are analyzed by the effective index method （EIM）. Combining with a single microstrip electrode modulating and the parameters of the ridge waveguide, velocity-match between lightwave and microwave can be achieved. The optical field and power are simulated by BPM using the above optimized parameters of the structure. An asymmetric path ridge waveguide for an organic polymer Mach-Zehdner modulator has been successfully designed and achieves 89.84° for the initial phase difference between the two arms and 27 dB for the extinction ratio.