Chinese Optics Letters, 2021, 19 (5): 050602, Published Online: Mar. 3, 2021  

Improved optical coupling based on a concave cavity lens fabricated by optical fiber facet etching Download: 723次

Author Affiliations
State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China
Abstract
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.

Kanglin Li, Jiangbing Du, Weihong Shen, Jiacheng Liu, Zuyuan He. Improved optical coupling based on a concave cavity lens fabricated by optical fiber facet etching[J]. Chinese Optics Letters, 2021, 19(5): 050602.

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