High-efficiency broadband fiber-to-chip coupler using a 3D nanoprinting microfiber

We propose a method for coupling a tapered optical fiber to an inverted tapered SiN waveguide by fabricating a microfiber using 3D nanoprinting lithography. The microfiber consists of three parts: a tapered cladding cap, an S-bend, and a straight part, all composed of high-refractive-index material....

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Bibliographic Details
Published in:arXiv.org 2023-03
Main Authors: Dong-Hui, Fan, Xing-Yu, Zhang, Wei-Jun, Zhang, Ruo-Yan, Ma, Jia-Min, Xiong, Yu-Ze, Wang, Chen, Zhi-Gang, Wang, Zhen, Li-Xing, You
Format: Article
Language:English
Subjects:
Broadband
Cladding
Coupling
Microfibers
Optical fibers
Waveguides
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Summary:We propose a method for coupling a tapered optical fiber to an inverted tapered SiN waveguide by fabricating a microfiber using 3D nanoprinting lithography. The microfiber consists of three parts: a tapered cladding cap, an S-bend, and a straight part, all composed of high-refractive-index material. Light is adiabatically coupled from the tapered fiber to the printed microfiber through the cladding cap. The light is then transmitted through the S-bend and the straight part with low loss and is finally coupled to the waveguide through the evanescent field. In the simulation, our design can achieve a high coupling efficiency (TE mode) of ~97% at a wavelength of 1542 nm with a wide bandwidth of ~768 nm at the 1-dB cut-off criterion.
ISSN:2331-8422
DOI:10.48550/arxiv.2303.09722