Application of adiabaticity map

Application of adiabaticity map: highly efficient coupling from optical fibers to silicon waveguides by adiabatic mode evolution

Chang, Li Fu (National Cheng Kung University)
Norte, R.A. (TU Delft Dynamics of Micro and Nano Systems)
Westerveld, W.J. (TU Delft Dynamics of Micro and Nano Systems)
Tseng, Shuo Yen (National Cheng Kung University)

Littlejohns, Callum G. (editor)
Sorel, Marc (editor)

2023

Efficient coupling of light from an optical fiber to silicon waveguides is a challenging task in integrated photonics. Couplers based on adiabatic mode evolution have the advantages of high bandwidth and low loss but are often accompanied by longer device lengths. In this paper, we introduce the concept of adiabaticity map and optimize the coupling between an optical fiber and Si waveguides by selecting routes on the map that minimize unwanted mode coupling. The map clearly indicates areas in mode evolution where supermode coupling is large and identifies optimal routes for efficient mode evolution. Optimized interaction length and widths are obtained from the adiabaticity map. We obtain highly efficient coupling (96%) with large bandwidth (1-dB bandwidth 280 nm) and misalignment tolerance (⪆90 nm lateral misalignment range for 1-dB excess losses) for the TE polarization.

adiabatic
Coupler
mode evolution
silicon photonics

http://resolver.tudelft.nl/uuid:2d80d82d-010a-41a0-83ad-f6f315e36926

https://doi.org/10.1117/12.2692415

SPIE

9781510668416

Emerging Applications in Silicon Photonics IV

Emerging Applications in Silicon Photonics IV 2023, 2023-10-25 → 2023-10-26, Glasgow, United Kingdom

Proceedings of SPIE - The International Society for Optical Engineering, 0277-786X, 12794

Institutional Repository

conference paper

© 2023 Li Fu Chang, R.A. Norte, W.J. Westerveld, Shuo Yen Tseng