Abstract

By analyzing the propagating behavior of the supermodes in a coupled-waveguide system, we have derived a universal criterion for designing adiabatic mode transformers. The criterion relates ε, the fraction of power scattered into the unwanted mode, to waveguide design parameters and gives the shortest possible length of an adiabatic mode transformer, which is approximately $2∕\pi {\epsilon }^{1∕2}$ times the distance of maximal power transfer between the waveguides. The results from numerical calculations based on a transfer-matrix formalism support this theory very well.

© 2009 Optical Society of America

Robust coupled-waveguide devices using shortcuts to adiabaticity

Shuo-Yen Tseng
Opt. Lett. 39(23) 6600-6603 (2014)

Counterdiabatic mode-evolution based coupled-waveguide devices

Shuo-Yen Tseng
Opt. Express 21(18) 21224-21235 (2013)

Adiabatically tapered periodic segmentation of channel waveguides for mode-size transformation and fundamental mode excitation

M. H. Chou, M. A. Arbore, and M. M. Fejer
Opt. Lett. 21(11) 794-796 (1996)

Adiabatic transfer of light via a continuum in optical waveguides

F. Dreisow, A. Szameit, M. Heinrich, R. Keil, S. Nolte, A. Tünnermann, and S. Longhi
Opt. Lett. 34(16) 2405-2407 (2009)

Numerically-assisted coupled-mode theory for silicon waveguide couplers and arrayed waveguides

Michael L. Cooper and Shayan Mookherjea
Opt. Express 17(3) 1583-1599 (2009)