Dr. Eric Rodrigue Numkam Fokoua Profile

Dr. Eric Rodrigue Numkam Fokoua

at Optoelectronics Research Ctr

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Author

Publications (8)

Proceedings Article | 25 May 2022 Presentation

Advances in hollow-core to standard fiber interconnection technology

Matěj Komanec, Dmytro Suslov, Ailing Zhong, Daniel Dousek, Stanislav Zvánovec, Eric Numkam Fokoua, Francesco Poletti, David Richardson, Radan Slavík

Proceedings Volume PC12140, PC1214001 (2022) https://doi.org/10.1117/12.2624102

KEYWORDS: Standards development, Signal attenuation, Single mode fibers, Micro optics, Telecommunications, Optical isolators, Optical filters, Multiplexers, Molecular bridges, Fusion splicing

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The attenuation of hollow-core fibers (HCFs) is predicted to surpass the minimum intrinsic attenuation of standard single-mode fibers (SMFs) in the near future. Recent advances in HCF performance and drawing technology have motivated their application not only in telecommunications but also in sensing and high-power delivery. Among HCFs, nested antiresonant nodeless fibers (NANFs) have shown the lowest attenuation values with 0.28 dB/km at 1550 nm and 0.22 dB/km at 1625 nm. Furthermore, the latest generation of NANFs effectively mitigates higher-order modes, which in some applications introduces a significantly limiting factor. As HCFs are becoming more available, their incorporation into standard SMF-based systems needs to be efficiently addressed. Various solutions to the HCF-SMF interconnection have already been proposed, such as the commonly employed fusion splicing with bridge fibers, using tapers to match the mode-fields, employing micro-optics, or using the fiber-array approach. Based on the fiber-array approach we have recently demonstrated losses of only 0.16 dB per interconnection and back reflection below -60 dB. But what if the interconnection itself can provide some additional functionality beyond low loss and low back reflection? Such an approach was already proposed in the micro-optics interconnection providing a function as an optical isolator or a wavelength-division multiplexer. Still, the relatively high complexity of such a device might limit its wider application. In this talk, I will overview current trends in HCF-SMF interconnection techniques which are enabling their incorporation into current SMF-based fiber-optic systems. I will present a future outlook of providing additional functionality to the HCF-SMF interconnection. I will focus on an interconnection technique we developed, based on the fiber-array approach. I will show how components such as an optical filter, a gas cell, or a Fabry-Perot cavity can be easily formed by simple tailoring of the HCF-SMF interconnection.

Proceedings Article | 7 March 2022 Presentation

Towards hollow-core optical fibers with lower attenuation than silica fibers

Hesham Sakr, Thomas Bradley, Gregory Jasion, Eric Rodrigue Numkam Fokoua, Seyed Reza Sandoghchi, Ian Davidson, Austin Taranta, Gianluca Guerra, William Shere, Yong Chen, John Hayes, David Richardson, Francesco Poletti

Proceedings Volume PC12028, PC1202802 (2022) https://doi.org/10.1117/12.2615006

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Proceedings Article | 18 April 2021 Poster + Presentation + Paper

Long-term stability of hollow core to standard optical fiber interconnection

Daniel Dousek, Matěj Komanec, Ailing Zhong, Dmytro Suslov, Stanislav Zvánovec, Petr Veselý, Yong Chen, Thomas Bradley, Eric Numkam Fokoua, Francesco Poletti, David Richardson, Radan Slavík

Proceedings Volume 11773, 117731B (2021) https://doi.org/10.1117/12.2592377

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Proceedings Article | 18 April 2021 Presentation

Unusual properties of hollow-core fibres

Radan Slavik, Eric Numkam Fokoua, Meng Ding, Zitong Feng, Francesco Poletti, David Richardson

Proceedings Volume 11773, 117730D (2021) https://doi.org/10.1117/12.2592496

KEYWORDS: Optical fibers, Interferometry, Temperature metrology, Glasses, Dispersion, Silica, Nonlinear dynamics, Laser damage threshold

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Proceedings Article | 5 March 2021 Presentation + Paper

Towards low loss hollow core optical fibers

Thomas Bradley, Gregory Jasion, Hesham Sakr, Ian Davidson, John Hayes, Austin Taranta, Kerrianne Harrington, Eric Numkam Fokoua, Yong Chen, David Richardson, Francesco Poletti

Proceedings Volume 11713, 117130A (2021) https://doi.org/10.1117/12.2579577

KEYWORDS: Optical fibers, Telecommunications, Signal attenuation, Optical communications

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Proceedings Article | 1 April 2020 Presentation

Sensitivity of phase and propagation delay in hollow-core fibres (Conference Presentation)

Radan Slavik, Eric Numkam Fokoua, Meng Ding, Yong Chen, Marco Petrovich, Thomas Bradley, Francesco Poletti, David Richardson

Proceedings Volume 11355, 1135507 (2020) https://doi.org/10.1117/12.2556424

KEYWORDS: Temperature metrology, Optical fibers, Clocks, Physics, Synchrotrons, Linear particle accelerators, Large telescopes, Interferometers, Fiber optics sensors, Quantum optics

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Proceedings Article | 31 January 2020 Open Access

Recent breakthroughs in hollow core fiber technology

Gregory Jasion, Thomas Bradley, Hesham Sakr, John Hayes, Yong Chen, Austin Taranta, Hans Christian Mulvad, Ian Davidson, Natalie Wheeler, Eric Numkam Fokoua, Wei Wang, David Richardson, Francesco Poletti

Proceedings Volume 11309, 1130902 (2020) https://doi.org/10.1117/12.2548585

KEYWORDS: Capillaries, Structured optical fibers, Signal attenuation, Scattering, Single mode fibers, Hollow waveguides

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Proceedings Article | 27 April 2016 Paper

Detailed study of macrobending effects in a wide transmission bandwidth hollow-core photonic bandgap fiber

Y. Chen, S. Sandoghchi, E. Numkam, T. Bradley, J. Hayes, N. Wheeler, G. Jasion, D. Gray, F. Poletti, M. Petrovich, D. Richardson

Proceedings Volume 9886, 98860X (2016) https://doi.org/10.1117/12.2225861

KEYWORDS: Structured optical fibers, Fiber characterization, Data centers, Data transmission, Nanophotonics, Specialty optical fibers, Cladding, Refractive index, Scanning electron microscopy, Scattering, Single mode fibers, Step index fibers, Optoelectronics, Photonic microstructures

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Showing 5 of 8 publications

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