Linear and nonlinear dynamics of mode conversion in longitudinally modulated coupled waveguides.

Authors

Yan Wang, Boan Feng

Published in

Applied optics. Volume 65. Issue 32. Pages 11195-11201. Nov 10, 2026. Epub Oct 13, 2026.

Abstract

We investigate mode conversion in coupled optical waveguides governed by longitudinal periodic modulation and interchannel coupling under linear and nonlinear regimes. Periodic modulation enables resonant conversion between modes with the same parity, whereas coupling effect induces interchannel power exchange between different initially excited modes. When both mechanisms coexist, they jointly determine the conversion frequency, thereby enabling flexible control of the conversion period. In addition, self-focusing nonlinearity shifts the resonance condition and suppresses conversion efficiency, especially in the weak coupling regime. Stronger coupling counteracts nonlinear effects and restores stable periodic mode conversion, providing an effective approach for controlling light propagation in coupled waveguide systems.

PMID:
43008145
Bibliographic data and abstract were imported from PubMed on 11 Nov 2026.

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