The fast quasiadiabatic approach to optical waveguide design

Hung Ching Chung, Zhong Ying Li, Fu Chieh Liang, Kun Sheng Lee, Shuo Yen Tseng

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)


Optical waveguide devices based on adiabatic mode evolution have large bandwidth and fabrication tolerances, but they have longer device lengths in general. We define a suitable adiabaticity parameter for optical waveguides and derive the formulae for engineering the adiabaticity along the waveguide. The fast quasiadiabatic dynamics (FAQUAD) protocol can then be applied to redistribute adiabaticity over the length of the device, speeding up mode evolution in adiabatic waveguide devices. By homogeneously distributing the adiabaticity along the length of the devices, shortcuts to adiabaticity are found for adiabatic waveguide devices, resulting in significant length reductions from the conventional designs. Devices on silicon, including mode (de)multiplexers, polarization splitter-rotators and 3 dB couplers using the FAQUAD approach are discussed. The FAQUAD approach leads to devices that are compact, broadband, and have good fabrication tolerances.

Original languageEnglish
Title of host publicationIntegrated Optics
Subtitle of host publicationDesign, Devices, Systems, and Applications V
EditorsPavel Cheben, Jiri Ctyroky, Inigo Molina-Fernandez
ISBN (Electronic)9781510627284
Publication statusPublished - 2019
EventIntegrated Optics: Design, Devices, Systems, and Applications V 2019 - Prague, Czech Republic
Duration: 2019 Apr 12019 Apr 3

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceIntegrated Optics: Design, Devices, Systems, and Applications V 2019
Country/TerritoryCzech Republic

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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