Affiliation:
1. Chinese Academy of Sciences (CAS)
2. CAS Center for Excellence in Superconducting Electronics (CENSE)
3. University of Chinese Academy of Sciences
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 ∼97% at a wavelength of 1542 nm with a wide bandwidth of ∼768nm at the 1-dB cutoff criterion.
Funder
National Natural Science Foundation of China
Key Technologies Research and Development Program
Science and Technology Commission of Shanghai Municipality
Youth Innovation Promotion Association of the Chinese Academy of Sciences
Subject
Atomic and Molecular Physics, and Optics,Engineering (miscellaneous),Electrical and Electronic Engineering