| 高偏振消光比铌酸锂波导调制器光路设计 |
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| 引用本文： | 张威,陈抱雪.高偏振消光比铌酸锂波导调制器光路设计[J].光学仪器,2017,39(4):66-69. |
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| 作者姓名： | 张威 陈抱雪 |
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| 作者单位： | 上海理工大学光电信息与计算机工程学院,上海,200093 |
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| 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。
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| 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 |
| 收稿时间： | 2016/12/1 0:00:00 |
Optical path design of LiNbO3 modulator with high polarization extinction ratio |
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| ZHANG Wei and CHEN Baoxue.Optical path design of LiNbO3 modulator with high polarization extinction ratio[J].Optical Instruments,2017,39(4):66-69. |
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| Authors: | ZHANG Wei and CHEN Baoxue |
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| Affiliation: | School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China and School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China |
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| Abstract: | A new optical structure is designed to improve the polarization extinction ratio of LiNbO3 waveguide phase modulator.At the input of the 3 dB power divider of the proton exchange waveguide,there is a Ti-LiNbO3 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. |
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| Keywords: | optical waveguide technology LiNbO3 waveguide phase modulator polarization extinction ratio integration with group |
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