Improved optical coupling based on a concave cavity lens fabricated by optical fiber facet etching

• 作者: Kanglin Li Jiangbing Du Weihong Shen Jiacheng Liu Zuyuan He
• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: Fiber Optics and Optical Communications
• 页码范围: 12-18
• 页数: 7页
• 语种: 英文
• DOI: 10.3788/COL202119.050602

摘要

We report a low-fabrication-complexity and wideband fiber lens,which is formed by fiber facet etching and filling high refractive index UV adhesive.The optical field can be significantly shrunk by the facet lens so as to obtain improved optical coupling.Numerical simulations were carried out for different coupling conditions,on both fundamental mode and high-order mode,for a nine-mode fiber.The fundamental mode area can be reduced from 152.17 to 12.57 μm2,and the coupling loss between the fiber lens and a photonic waveguide can be reduced to-2.9 dB with over 1000 nm 3 dB bandwidth.