Open AccessInverse design and demonstration of an ultracompact broadband dual-mode 3 dB power splitter
Author(s) -
Weijie Chang,
Xinshu Ren,
Yingquan Ao,
Liangliang Lu,
Mengfan Cheng,
Lei Deng,
Deming Liu,
Minming Zhang
Publication year - 2018
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.26.024135
Subject(s) - splitter , optics , broadband , insertion loss , multiplexing , coupled mode theory , waveguide , rotational symmetry , physics , inverse , footprint , power (physics) , materials science , optoelectronics , telecommunications , computer science , refractive index , geometry , mathematics , mechanics , paleontology , quantum mechanics , biology
An ultracompact broadband dual-mode 3 dB power splitter using inverse design method for highly integrated on-chip mode (de) multiplexing system is proposed and experimentally demonstrated. A dual-mode convertor based on subwavelength axisymmetric three-branch waveguide is utilized to convert TE 0 and TE 1 to three intermediate fundamental modes. The axisymmetric topology constraint of the nanostructures enables the optimized device to achieve a strict 50:50 splitting ratio over a broad wavelength range from 1.52 to 1.60 µm. The fabricated device occupied a compact footprint of only 2.88 µm × 2.88 µm. The measured average excess losses and crosstalks for both modes were respectively less than 1.5 dB and -20 dB from 1.52 to 1.58 µm for both TE 0 and TE 1 , which are consistent with the numerical simulations.