论文标题
超低损失氯烯烯甲酸锂波导与绝热的单模式光纤之间有效的光耦合
Efficient light coupling between an ultra-low loss lithium niobate waveguide and an adiabatically tapered single mode optical fiber
论文作者
论文摘要
绝缘子山脊波导上的Niobate锂允许构建高密度光子积分电路，这要归功于其高指数对比度提供的小弯曲半径。同时，光纤与单模锂波导之间的显着模式现场不匹配导致较低的耦合效率。在这里，我们在数字和实验上都证明了问题可以通过优化模式字段配置文件的锥形单模式纤维解决。数值模拟表明，TE和TM模式的最小耦合损耗分别为0.32 dB和0.86 dB。在实验上，尽管没有抗反射涂层，但TE和TM模式的测得的耦合损耗分别为1.32 dB和1.88 dB。我们的技术为各种芯片锂二甲虫应用铺平了一种方式。
A lithium niobate on insulator ridge waveguide allows constructing high-density photonic integrated circuits thanks to its small bending radius offered by the high index contrast. Meanwhile, the significant mode-field mismatch between an optical fiber and the single-mode lithium niobate waveguide leads to low coupling efficiencies. Here, we demonstrate, both numerically and experimentally, that the problem can be solved with a tapered single mode fiber of an optimized mode field profile. Numerical simulation shows that the minimum coupling losses for the TE and TM mode are 0.32 dB and 0.86 dB, respectively. Experimentally, though without anti-reflection coating, the measured coupling losses for TE and TM mode are 1.32 dB and 1.88 dB, respectively. Our technique paves a way for a broad range of on-chip lithium niobate applications.
