Fast Adiabatic Mode Evolution Assisted 2 × 2 Broadband 3 dB Coupler Using Silicon-on-Insulator Fishbone-like Grating Waveguides

We report a novel 2 × 2 broadband 3 dB coupler based on fast adiabatic mode evolution with a compact footprint and large bandwidth. The working principle of the coupler is based on the rapid adiabatic evolution of local eigenmodes of fishbone-like grating waveguides. Different from a traditional adi...

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Bibliographic Details
Published inNanomaterials (Basel, Switzerland) Vol. 13; no. 20; p. 2776
Main Authors Xue, Yulong, Zhang, Lingxuan, Ren, Yangming, Lei, Yufang, Sun, Xiaochen
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 17.10.2023
MDPI
Subjects
Adiabatic
Adiabatic flow
Analysis
Bandwidths
Broadband
broadband coupler
Broadband transmission
Couplers
Coupling
Evolution
fast adiabatic
Geometry
grating waveguides
Light
local eigenmodes
Photonics
power splitter
Silicon
Spectrum allocation
Waveguides
China
Online AccessGet full text
ISSN2079-4991
2079-4991
DOI10.3390/nano13202776

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Summary:We report a novel 2 × 2 broadband 3 dB coupler based on fast adiabatic mode evolution with a compact footprint and large bandwidth. The working principle of the coupler is based on the rapid adiabatic evolution of local eigenmodes of fishbone-like grating waveguides. Different from a traditional adiabatic coupling method realized by the slow change of the cross-section size of a strip waveguide, a fishbone waveguide allows faster adiabatic transition with proper structure and segment designs. The presented 3 dB coupler achieves a bandwidth range of 168 nm with an imbalance of no greater than ±0.1 dB only for a 9 μm coupling region which significantly improves existing adiabatic broadband couplers.
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ISSN:2079-4991
2079-4991
DOI:10.3390/nano13202776