1.
Appl Opt
; 62(16): 4203-4212, 2023 Jun 01.
Article
in English
| MEDLINE
| ID: mdl-37706905
ABSTRACT
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 â¼97% at a wavelength of 1542 nm with a wide bandwidth of â¼768n m at the 1-dB cutoff criterion.