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| 高偏振消光比铌酸锂波导调制器光路设计 |
| Optical path design of LiNbO3 modulator with high polarization extinction ratio |
| 投稿时间：2016-12-01 |
| DOI：10.3969/j.issn.1005-5630.2017.04.011 |
| 中文关键词: 光波导技术 LiNbO3波导相位调制器 偏振消光比 同基集成 |
| 英文关键词:optical waveguide technology LiNbO3 waveguide phase modulator polarization extinction ratio integration with group |
| 基金项目: |
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| 中文摘要: |
| 设计了一种新的光路结构，用于提高LiNbO3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3 dB功分器的输入端同基构造了Ti-LiNbO3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。1 550 nm波长的BPM仿真运行表明，设计光路的偏振消光比达到87 dB以上。 |
| 英文摘要: |
| 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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