高偏振消光比铌酸锂波导调制器光路设计  

Optical path design of LiNbO_3 modulator with high polarization extinction ratio

作　　者：张威[1] 陈抱雪[1] 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《光学仪器》2017年第4期66-69,共4页Optical Instruments

摘　　要：设计了一种新的光路结构,用于提高LiNbO_3波导相位调制器的偏振消光比。光路特点是,在质子交换波导3dB功分器的输入端同基构造了Ti-LiNbO_3波导模式分离定向耦合的结构以实现TE导模与TM模分离,Y分支波导位置下沉以避免前向TM辐射模的窜扰。效果表现为,与保偏光纤端耦合寄生的TM辐射模得到了有效抑制,寄生的TM导模被定向疏散。1 550nm波长的BPM仿真运行表明,设计光路的偏振消光比达到87dB以上。A new optical structure is designed to improve the polarization extinction ratio of LiNb03 waveguide phase modulator. At the input of the 3 dB power divider of the proton exchange waveguide,there is a Ti-LiNb03 waveguide mode separation directional coupler with the base structure for the separation of TE mode and TM mode. Y-branch waveguide is sunk to avoid scrambling of the forward TM radiation mode. The parasitic TM radiation mode with polarization-maintaining fiber is effectively suppressed and the parasitic TM guided mode is evacuated. The BPM simulation of 1 550 nm wavelength shows that the polarization extinction ratio of the designed optical path is more than 87 dB.

关 键 词：光波导技术 LiNbO_3波导相位调制器 偏振消光比 同基集成 

分 类 号：TN256[电子电信—物理电子学]