摘要
多模波导干涉(MMI)耦合器在集成光路中被用来实现波导模式的转换或合并。对于实际的基于硅绝缘体(SOI)的三维波导,数值设计方法是必需的。采用有限差分波束传输法(FD-BPM)设计了一种66%模式转换、合并器。首先由FD-BPM求出MMI耦合器的输入、输出波导所支持的基模和一阶导模的模场分布,通过数值方法得到MMI耦合器的长度,然后将求得的模场作为输入波场,经过FD-BPM运算后在器件输出面上计算交叉积分得出实际的由基模转换为一阶模的功率百分比。对于算例中采用的SOI波导,器件长度为829μm,65.7%的功率由基模转换为一阶模。
The multimode interference （MMI） couplers are used to implement the conversion or combination of modes in integrated optical circuit. The numeric method is necessary for the actual waveguide in silicon-on-insulator （SOD wafers. The finite difference beam propagation method （FD-BPM） is used to design a device of 66% MMI-converter-Combiners. First, the fields of the fundamental mode and the first-order mode are analyzed by the FD-BPM. And then the length of this device is designed by FD-BPM simulation. Finally the mode fields are used as input light and the ratio of power which is converted from fundamental mode to first-order mode is computed by cross integral. For the SOI waveguide as designed example, the length of MMI coupler is 829 μm and the ratio of modal power transformation is 65.7%.
出处
《光学与光电技术》
2008年第5期88-90,共3页
Optics & Optoelectronic Technology
关键词
集成光学
多模波导干涉耦合器
波束传输法
模式转换
模式合并
integrated optics
multimode interference couplers
beam propagation method
mode conversion
mode combination
