Displacement sensor based on a large-core hollow fiber and specklegram analysis

Article Multidisciplinary Sciences

Hollow-core fibers with reduced surface roughness and ultralow loss in the short-wavelength range

Jonas H. Osorio et al.

Summary: Improving the core roughness of hollow-core fibers leads to record low attenuation values at short-wavelengths, opening up exciting prospects in visible and UV-photonics.

NATURE COMMUNICATIONS (2023)

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Article Optics

Machine learning for sensing with a multimode exposed core fiber specklegram sensor

Darcy L. Smith et al.

Summary: In this paper, we demonstrate that deep learning improves the analysis of fiber specklegrams for sensing, and apply it to measurements of air temperature and water immersion length. We compare deep neural networks (DNNs) including a convolutional neural network and a multi-layer perceptron network with a traditional correlation technique using data from a multimode fiber exposed-core fiber. We also show the ability of the DNNs to be trained against random noise sources like specklegram translations.

OPTICS EXPRESS (2022)

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Article Optics

Near- and middle-ultraviolet reconfigurable Raman source using a record-low UV/visible transmission loss inhibited-coupling hollow-core fiber

M. Chafer et al.

Summary: Two types of Raman laser sources emitting in near and middle ultraviolet spectral ranges have been developed using a solarization-resilient gas-filled HCPCF with record low transmission loss. The sources offer new opportunities for ozone detection and monitoring with a very small footprint and solarization-free design.

OPTICS AND LASER TECHNOLOGY (2022)

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Article Multidisciplinary Sciences

Hollow-core optical fibre sensors for operando Raman spectroscopy investigation of Li-ion battery liquid electrolytes

Ermanno Miele et al.

Summary: New analytical tools are urgently needed to identify chemical degradation and failure mechanisms in Li-ion batteries. In this study, an operando Raman spectroscopy method based on hollow-core optical fibres was developed to monitor the chemistry of liquid electrolytes during battery cycling. Analysis of spectroscopy measurements revealed changes in electrolyte additives and solvents ratio with respect to cell voltage, indicating the potential to track lithium-ion solvation dynamics.

NATURE COMMUNICATIONS (2022)

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Article Engineering, Electrical & Electronic

Understanding the impact of cladding modes in multi-mode hollow-core anti-resonant fibres

William Shere et al.

Summary: Multi-moded, anti-resonant hollow-core fibre shows great promise for various applications. Understanding the behaviour of higher order modes in these fibres is crucial for exploiting their benefits in few- and multi-moded applications or designing more robust single mode fibres. This work conducts thorough numerical investigations into the origins of confinement loss in tubular anti-resonant fibres and its dependence on the fibre's key structural parameters. The study reveals that leakage loss can be interpreted as originating from resonant out-coupling between the core modes of interest and the lossy modes of the cladding tubes, with highest loss when they are phase-matched.

OPTICAL FIBER TECHNOLOGY (2022)

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Article Engineering, Electrical & Electronic

Hollow-core photonic crystal fibers for Power-over-Fiber systems

Jonas H. Osorio et al.

Summary: Research achievements in hollow-core photonic crystal fibers technology have identified these fibers as excellent platforms for delivering high-power laser beams with minimal interaction with the fiber microstructure. Here, the utilization of a tubular-lattice hollow-core fiber as a promising platform for Power-over-Fiber systems is demonstrated, which expands the range of hollow-core fiber-based beam delivery applications. The experiments reported here identify hollow-core fibers as eligible candidates for next-generation Power-over-Fiber devices.

OPTICAL FIBER TECHNOLOGY (2022)

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Article Optics

Low-loss single-mode hybrid-lattice hollow-core photonic-crystal fibre

Foued Amrani et al.

Summary: The design of hollow-core photonic crystal fibres with hybrid-lattice cladding significantly reduces confinement loss and preserves single-mode operation, showing potential for next-generation optical fibres.

LIGHT-SCIENCE & APPLICATIONS (2021)

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Article Engineering, Electrical & Electronic

Multimode Nested Antiresonant Hollow Core Fiber

Charu Goel et al.

Summary: A novel centro-symmetric nested antiresonant fiber (CNAF) design is proposed and investigated numerically for low-loss, multimode applications, showing superiority over conventional asymmetric nested tube designs in inhibiting coupling of higher order modes to lossy cladding modes and supporting multiple distinct core mode groups. The designed fiber supports 5 to 9 spatially distinct core mode groups with confinement loss less than 0.002 dB/m to 0.01 dB/m respectively.

JOURNAL OF LIGHTWAVE TECHNOLOGY (2021)

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Article Optics

Long-range multicore optical fiber displacement sensor

Monserrat C. Alonso-Murias et al.

Summary: In this Letter, a long-range optical fiber displacement sensor based on a strongly coupled multicore fiber is proposed and demonstrated. The sensor uses interference patterns in the reflection spectrum to measure displacements with high sensitivity and a large dynamic measurement range.

OPTICS LETTERS (2021)

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Article Materials Science, Multidisciplinary

Angle-Resolved Hollow-Core Fiber-Based Curvature Sensing Approach

William M. Guimaraes et al.

Summary: A new hollow-core fiber-based curvature sensing approach has been proposed and theoretically studied, capable of detecting both curvature radius and angle. By adjusting the placement of tubes within the fiber and exploring spectral shifts, a multi-axis curvature sensing method has been demonstrated. The proposed method shows promising results in determining curvature radii and angles with percentual errors of less than 7% in selected cases.

FIBERS (2021)

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Article Optics