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Broadband 2 × 2 multimode interference coupler for mid-infrared wavelengths

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Abstract

Beam splitters are core components of photonic integrated circuits and are often implemented with multimode interference couplers. While these devices offer high performance, their operational bandwidth is still restrictive for sensing applications in the mid-infrared wavelength range. Here we experimentally demonstrate a subwavelength-structured $2 \times 2$ multimode interference coupler with high performance in the $3.1 {-} 3.7\,{\unicode{x00B5}{\rm m}}$ range, doubling the bandwidth of a conventional device.

© 2021 Optical Society of America

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Supplementary Material (1)

NameDescription
Supplement 1       Derivation of the analytical model for the MZI output power used for fitting of the experimental data.

Data Availability

All data supporting this study are openly available in Ref. [32].

32. C. J. Stirling, R. Halir, A. Sánchez-Postigo, Z. Qu, J. D. Reynolds, J. S. Penadés, G. S. Murugan, A. Ortega-Moñux, J. G. Wangüemert-Pérez, I. Molina-Fernández, G. Z. Mashanovich, and M. Nedeljkovic, “A broadband 2x2 multimode interference coupler for mid-infrared wavelengths,” University of Southampton (2021) http://dx.doi.org/10.5258/SOTON/D1914.

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Equations (2)

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