Application of adiabaticity map

highly efficient coupling from optical fibers to silicon waveguides by adiabatic mode evolution

Conference paper (2023)

Authors

Li Fu Chang National Cheng Kung University

R.A. Norte Dynamics of Micro and Nano Systems - Mechanical, Maritime and Materials Engineering

W.J. Westerveld Dynamics of Micro and Nano Systems - Mechanical, Maritime and Materials Engineering

Shuo Yen Tseng National Cheng Kung University

Research Group

Dynamics of Micro and Nano Systems (Mechanical, Maritime and Materials Engineering) (TU Delft)

DOI: https://doi.org/10.1117/12.2692415

Silicon photonics Adiabatic Coupler Mode evolution

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Published Date

2023

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Precision and Microsystems Engineering

Research Group

Dynamics of Micro and Nano Systems

Abstract

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.

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