Dr. Luis Andre Neves Paiva Fernandes Profile

Dr. Luis Andre Neves Paiva Fernandes

Senior Scientist

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Dr. Luis Fernandes received a degree in Applied Physics in 2006, and a Ph.D. in Physics in 2012, from the Faculty of Science at the University of Porto.

In 2008 he was awarded a Ph.D. fellowship from the Portuguese Foundation for Science and Technology. His doctoral work was researched in collaboration with the Photonics Group at the University of Toronto, where he became a postdoctoral fellow in 2013. While he was a PhD student he received the Scholarship in Optical Science and Engineering from the SPIE in 2010. From 2013 to 2018 he worked as a senior optical scientist at OZ Optics. He is a senior optical designer at VIAVI Solutions since 2018.

From 2010 to 2013 he was a member of the 1st board of the SPIE student Chapter at the University of Toronto.
He is a member of the IEEE, SPOF, SPF, OSA, and SPIE. He is a member of the IEEEXtreme Executive Committee since 2018 and he is currently the Chair of the Committee since 2021.

Proceedings Article | 1 April 2016 Paper

Direct writing of fiber optic components in photonic crystal fibers and other specialty fibers

Luis Andre Fernandes, Omur Sezerman, Garland Best, Mi Li Ng, Saidou Kane

Proceedings Volume 9740, 97400N (2016) https://doi.org/10.1117/12.2213597

KEYWORDS: Waveguides, Femtosecond phenomena, Cladding, Photonic crystals, Polarization, Integrated optics, Geometrical optics, Phase modulation, Photonic crystal fibers, Light scattering

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Proceedings Article | 15 February 2012 Paper

Femtosecond laser writing of polarization devices for optical circuits in glass

Luís A. Fernandes, Jason Grenier, Peter Herman, J. Stewart Aitchison, Paulo V. Marques

Proceedings Volume 8247, 82470M (2012) https://doi.org/10.1117/12.907517

KEYWORDS: Polarization, Waveguides, Birefringence, Femtosecond phenomena, Wave plates, Beam splitters, Polarizers, Pulsed laser operation, Glasses, Silica

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Proceedings Article | 5 August 2009 Paper

Fiber Bragg grating inscription with DUV femtosecond exposure and two beam interference

Martin Becker, Joachim Bergmann, Sven Brückner, Eric Lindner, Manfred Rothhardt, Kay Schuster, Jens Kobelke, Sonja Unger, Hartmut Bartelt, Luis Fernandes, Paulo V. S. Marques

Proceedings Volume 7386, 73862Y (2009) https://doi.org/10.1117/12.838605

KEYWORDS: Fiber Bragg gratings, Femtosecond phenomena, Interferometers, Silica, Mirrors, Fiber lasers, Germanium, Refractive index, Glasses, Absorption

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Fiber Bragg gratings (FBGs) are today fundamental components in fiber optics. They can be used as sensors, in signal processing, e.g. telecom applications, as wavelength stabilizers in fiber lasers or in dispersion compensators. However, there are applications where the demand for fiber Bragg gratings is not compatible with standard photosensitivity techniques like germanium doping or hydrogen loading. Examples are their use as laser-mirrors in spliceless all fiber fiber-laser solutions or the fiber Bragg grating inscription in suspended core all silica fibers for evanescent field sensing. Fiber Bragg grating inscription with femtosecond-laser exposure is a challenging new method to realize grating structures for waveguides made of materials which do not provide UV-photosensitivity. Especially fs-IR-inscription has been demonstrated for Bragg grating inscription in a variety of material systems such as boron-silica glass, sapphire and pure silica glass. The feasibility of the phase mask FBG inscription technique with DUV femtosecond lasers was also shown, which allows grating inscription even in pure silica microstructured fibers. The phase mask inscription method requires that the fiber will be placed directly behind the phase mask. While the laser beam should be focused onto the fiber to support nonlinear material interaction, this inscription method also leads to phase mask degradations, presumably due to non-bridging oxygen holes (NBOH). Our solution to avoid the mask degradation is to increase the space between fiber and phase mask by using a Talbot-interferometer. Another advantage is the wavelength versatility of this inscription setup. Due to the short temporal coherence length of the femtosecond pulses, the angular alignment variability of the interferometer mirrors is limited and restrictions concerning the wavelength versatility of the interferometer arise. Grating arrays in pure silica suspended core fibers are demonstrated as an example for the versatility of the inscription arrangement.

Proceedings Article | 5 August 2009 Paper

Temperature and strain characterization of Bragg gratings impressed with femtosecond laser radiation in suspended-silica-core fibers

Luís Fernandes, Martin Becker, Orlando Frazão, Manfred Rothhardt, Sven Brückner, Kay Schuster, Jens Kobelke, José Santos, Paulo V. S. Marques

Proceedings Volume 7386, 73861N (2009) https://doi.org/10.1117/12.839641

KEYWORDS: Optical fibers, Fiber Bragg gratings, Femtosecond phenomena, Silica, Temperature metrology, Refractive index, Cladding, Germanium, Pulsed laser operation, Bridges

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Proceedings Article | 16 May 2007 Paper

Fabrication and test of an integrated optical sensor with high sensitivity and high dynamic range based on a Mach-Zehnder interferometric configuration

D. Alexandre, J. Viegas, L. Fernandes, P. Moreira, A.M.P. Leite, J. Santos, P.V.S. Marques

Proceedings Volume 6585, 65850L (2007) https://doi.org/10.1117/12.722764

KEYWORDS: Waveguides, Refractive index, Fiber Bragg gratings, Interferometry, Water, Channel waveguides, Cladding, Ultraviolet radiation, Absorption, Sensors

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