Open AccessOn-chip mode converter based on two cascaded Bragg gratings
Author(s) -
Rulei Xiao,
Yuechun Shi,
Jia Li,
Pan Dai,
Yong Zhao,
Lianyan Li,
Jun Lu,
Xiangfei Chen
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.001941
Subject(s) - finite difference time domain method , converters , coupled mode theory , optics , fiber bragg grating , bandwidth (computing) , chip , mode (computer interface) , computer science , electronic engineering , materials science , wavelength , physics , refractive index , voltage , telecommunications , engineering , quantum mechanics , operating system
We propose an on-chip mode converter via two cascaded Bragg reflection processes. A forward conversion between two guided modes can be achieved with the aid of an additional mode. The proposed structure is theoretically studied and simulated via the rigorous three-dimensional finite-difference time-domain (3D-FDTD) method. The bandwidth and central wavelength of the proposed mode converter can be adjusted according to our theoretical analysis and simulation results. By applying the similar design approaches as fiber Bragg gratings, conversion spectra with different shapes can be obtained. As an example, several mode converters with bandpass and sidelobe-reduced spectra are designed. We also investigate and verify the mode conversion by experiment. Therefore, the proposed method may pave a new path for the mode converters with desired conversion spectra.