Open AccessSimulating the effects of refractive index difference on the coupling efficiency of periodically segmented waveguide mode converter
Author(s) -
Yu Zheng,
Hao He,
Lianqiong Jiang,
Jian Duan
Publication year - 2021
Publication title -
optica applicata
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.204
H-Index - 28
eISSN - 1899-7015
pISSN - 0078-5466
DOI - 10.37190/oa210408
Subject(s) - materials science , coupling (piping) , waveguide , refractive index , optics , chip , transmission (telecommunications) , optical fiber , coupling loss , optoelectronics , computer science , telecommunications , physics , composite material
Efficient coupling of micro/nano-optical waveguides with single-mode fibers is the premise for the efficient operation of the integrated photonic chip, which directly determines its optical performance. In this paper, the design principles of periodically segmented waveguide (PSW) structure used for high-efficiency fiber-chip coupling are proposed, and the effects of refractive index difference Δ on coupling efficiency and structural parameters are studied by simulation. It is found that as the Δ of the PSW increases, the period of the PSW tends to be smaller, and the coupling efficiency decreases continuously, reduced by around 0.673 dB in the range of Δ = 3% to Δ = 7%. Through the analysis of PSW optical mechanisms, it demonstrates that the main reason for the decrease of coupling efficiency is that the transmission loss of the tapered section increases sharply with the increase of Δ . High- Δ PSW is difficult to apply to highly integrated silica optical chips due to the unignorably insertion loss.