Widely tunable dual acousto-optic interferometric device based on a hollow core fiber

Ricardo E. da Silva; Jonas H. Osório; Frédéric Gérôme; Fetah Benabid; David J. Webb; Marcos A. R. Franco; Cristiano M. B. Cordeiro

doi:10.1016/j.optlastec.2024.112093

arXiv · 2409.09148

Widely tunable dual acousto-optic interferometric device based on a hollow core fiber

Ricardo E. da Silva·Jonas H. Osório·Frédéric Gérôme·Fetah Benabid·David J. Webb·Marcos A. R. Franco·Cristiano M. B. Cordeiro

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Abstract

An all-fiber dual Mach-Zehnder interferometer (MZI) based on an acoustically modulated hollow-core fiber (HCF) is experimentally demonstrated for the first time. By attaching an acoustic driver in between the fixed ends of an HCF, we fabricated two acousto-optic modulators (AOMs) with distinct driver positions, allowing for synchronizing two in-line MZIs inside the HCF. The first MZI is set by two acoustic long-period gratings separated by a second MZI formed at the fiber and driver attaching region. We show that this setup enables frequency-tuning of the coupling between the fundamental and higher-order modes in the HCF. Additionally, we simulate and analyze the HCF modal couplings and MZIs' modulated spectra under distinct device parameters using the transfer matrix method. The new AOM-MZI enables tuning of the MZIs free spectral range by adjusting 1 Hz of the electrical frequency, which is promising to modulate multiwavelength filters, sensors and fiber lasers.

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Ricardo E. da Silva, Jonas H. Osório, Frédéric Gérôme, Fetah Benabid, David J. Webb, Marcos A. R. Franco, Cristiano M. B. Cordeiro. 2024-09-13. Widely tunable dual acousto-optic interferometric device based on a hollow core fiber. https://doi.org/10.1016/j.optlastec.2024.112093

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