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Light coupling to photonic integrated circuits using optimized lensed fibers
Dengke Chen, Zeying Zhong, Sanli Huang, Jiahao Sun, Sicheng Zeng, Baoqi Shi, Yi-Han Luo, Junqiu Liu
https://arxiv.org/abs/2510.10635

Light coupling to photonic integrated circuits using optimized lensed fibers
Efficient and reliable light coupling between optical fibers and photonic integrated circuits has arguably been the most essential issue in integrated photonics for optical interconnects, nonlinear signal conversion, neuromorphic computing, and quantum information processing. A commonly employed approach is to use inverse tapers interfacing with lensed fibers, particularly for waveguides of relatively low refractive index such as silicon nitride (Si3N4), silicon oxynitride and lithium niobate. …

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