Coupled-mode theory for low-crosstalk higher-order modes of optical waveguides

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2025-10

Department

Department of Applied Physics

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Mcode

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Language

en

Pages

12

Series

Physical Review Research, Volume 7, issue 4, pp. 1-12

Abstract

Optical crosstalk between waveguides limits the miniaturization of photonic integrated circuits. Recently, it has been shown that, using higher-order modes, the crosstalk can be significantly reduced not only between neighboring waveguides, but also between other photonic components, such as waveguide couplers and interferometers. This opens the possibility of further miniaturization of photonic chips. Here, we present a theoretical approach to investigate the peculiar properties of these low-crosstalk modes. The approach includes a semianalytical method for computing the long-range coupling coefficients of the modes. It allows us to study the dependence of light propagation on these coefficients in both finite and infinite waveguide arrays. Our findings shed light on the crosstalk suppression mechanism and intriguing discrete diffraction phenomena realizable in waveguide arrays using higher-order modes.

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Keywords

crosstalk reduction, silicon waveguides

Other note

DOI

10.1103/9prf-1ldr

Citation

Hilden, P, Yousry, F & Shevchenko, A 2025, 'Coupled-mode theory for low-crosstalk higher-order modes of optical waveguides', Physical Review Research, vol. 7, no. 4, 043303, pp. 1-12. https://doi.org/10.1103/9prf-1ldr

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https://urn.fi/URN:NBN:fi:aalto-202512299638

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[article-cris] Perustieteiden korkeakoulu / SCI