Dr. Hans Georg Limberger Profile

Dr. Hans Georg Limberger

Group Leader at Ecole Polytechnique Fédérale de Lausanne

SPIE Involvement:

Author

Proceedings Article | 23 May 2005 Paper

Direct measurement of fiber Bragg grating local birefringence using optical low coherence reflectometry

Dragan Coric, Hans Limberger, Rene Salathe

Proceedings Volume 5855, (2005) https://doi.org/10.1117/12.623634

KEYWORDS: Birefringence, Fiber Bragg gratings, Polarization, Spatial resolution, Coherence (optics), Reflectometry, Inverse scattering, Phase modulation, Tunable lasers, Signal detection

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Proceedings Article | 23 May 2005 Paper

Stress profiling of arc-induced long-period gratings written in pure-silica-core fibers

Gaspar Rego, J. Carvalho, P. Marques, Alberto Fernandez Fernandez, F. Duerr, Hans Limberger

Proceedings Volume 5855, (2005) https://doi.org/10.1117/12.624285

KEYWORDS: Optical fibers, Cladding, Gas lasers, Diffusion, Profiling, Tomography, Silica, Annealing, Fabrication, Carbon monoxide

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Proceedings Article | 16 May 2005 Paper

In situ simultaneous strain and temperature measurement of adaptive composite materials using a fiber Bragg grating based sensor

Hyuk-Jin Yoon, Daniele Costantini, Veronique Michaud, Hans Limberger, Jan-Anders Manson, Rene Salathe, Chun-Gon Kim, Chang-Sun Hong

Proceedings Volume 5758, (2005) https://doi.org/10.1117/12.599075

KEYWORDS: Fiber Bragg gratings, Composites, Sensors, Temperature metrology, Optical fibers, Shape memory alloys, Fiber optics sensors, Thermal optics, Condition numbers, Epoxies

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Proceedings Article | 10 September 2004 Paper

Round-robin for fiber Bragg grating metrology during COST270 action

Alberto Fernandez Fernandez, Andrei Gusarov, Francis Berghmans, Kyriacos Kalli, Valentin Polo, Hans Limberger, Martijn Beukema, Philipp Nellen

Proceedings Volume 5465, (2004) https://doi.org/10.1117/12.545496

KEYWORDS: Fiber Bragg gratings, Metrology, Calibration, Optical fibers, Reflectivity, Temperature metrology, Transmittance, Telecommunications, Optical networks, Standards development

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Proceedings Article | 10 September 2004 Paper

An all-fiber Pr/Yb-doped up-conversion laser in different laser operation modes

M. Zeller, Hans Limberger, Theo Lasser

Proceedings Volume 5457, (2004) https://doi.org/10.1117/12.554768

KEYWORDS: Output couplers, Fiber lasers, Fiber Bragg gratings, Picosecond phenomena, Reflectors, Modulators, Tunable lasers, Reflectivity, Mode locking, Modes of laser operation

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Proceedings Article | 27 June 2002 Paper

Characterization of embedded fiber Bragg grating sensors written in high-birefringent optical fibers subjected to transverse loading

Federico Bosia, Philippe Giaccari, Mauro Facchini, John Botsis, Hans Limberger, Rene-Paul Salathe

Proceedings Volume 4694, (2002) https://doi.org/10.1117/12.472616

KEYWORDS: Sensors, Fiber Bragg gratings, Phase modulation, Epoxies, Birefringence, Optical fibers, Finite element methods, Polarization, Silica, Refractive index

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Proceedings Article | 28 September 1999 Paper

Advances in fiber gratings: technology, applications, and reliability

Hans Limberger, Dimitris Varelas

Proceedings Volume 10295, 1029508 (1999) https://doi.org/10.1117/12.367127

KEYWORDS: Reliability, Networks, Annealing, Fiber optics sensors, Hydrogen, Telecommunications, Excimer lasers, Laser irradiation, Fiber lasers, Fiber coatings

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Basic components and devices for optical fiber sensor and telecommunication networks should exhibit survival times of 20 to 40 years. Fiber gratings are important basic devices for such networks. This demands good thermal and mechanical reliability of the grating itself. However, as it will be shown in this paper, both reliability aspects depend strongly on factors like grating fabrication conditions, the fiber used, a possible photosensitization process, etc. The thermal stability of fiber gratings is strongly linked to the fiber, its co-dopants and possible photosensitization by hydrogen loading. Determining the electron distribution of the involved defects can assess the reliability. To a first approximation the decay is determined by the decay frequency v₀. Good thermal stability over 25 years at 40 °C can be predicted for germanosilicate fibers if the gratings are annealed for 110 hours at T≈120 °C. Higher operating temperatures demand higher annealing temperatures for reasonable annealing times and do need therefore special protections like polyimide coatings. The mechanical breaking strength of fiber gratings is related to the grating fabrication process and fiber preparation. For telecommunication applications, gratings are in general fabricated off-line. In this case, careful chemical fiber stripping and handling is needed. When gratings are written using pulsed KrF excimer laser irradiation a considerable mechanical degradation is observed, which depends on the irradiation conditions. In contrary, frequency doubled CW-Ar⁺ laser irradiation almost preserves the median breaking stress. Gratings fabricated by one single laser shot or written through the fiber coating show almost no degradation. However, due to their low reflectivity the use of single shot gratings is mostly restricted to sensor applications. The fabrication of grating devices by irradiation through the coating is still limited to index modulations of 10^-4 due to coating degradation.

Proceedings Article | 1 September 1999 Paper

Fiber Bragg grating reliability studies in Europe

H. Limberger

Proceedings Volume 3746, 37462O (1999) https://doi.org/10.1117/12.2302086

KEYWORDS: Reliability, Fiber Bragg gratings

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Proceedings Article | 31 May 1999 Paper

Measurement of stress concentrations using embedded optical fiber Bragg grating sensors

Kara Peters, Michel Studer, John Botsis, Alessandro Iocco, Hans Limberger, Rene-Paul Salathe

Proceedings Volume 3670, (1999) https://doi.org/10.1117/12.349730

KEYWORDS: Optical fibers, Fiber Bragg gratings, Sensors, Speckle pattern, Epoxies, Chlorine, Interferometry, Calibration, Solids, Composites

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Proceedings Article | 20 November 1996 Paper

Mechanical degradation of optical fibers induced by UV light

Hans Limberger, Dimitris Varelas, Rene-Paul Salathe, Georges Kotrotsios

Proceedings Volume 2841, (1996) https://doi.org/10.1117/12.258981

KEYWORDS: Optical fibers, Fiber Bragg gratings, Ultraviolet radiation, Resistance, Failure analysis, Germanium, Fiber lasers, Coating, Telecommunications, Silica

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Proceedings Article | 13 September 1995 Paper

Piezoelectric fiber optic modulators and microtubes

Glen Fox, Claude Muller, Matthius Kuhn, Nava Setter, Nguyen Ky, Hans Limberger

Proceedings Volume 2641, (1995) https://doi.org/10.1117/12.220942

KEYWORDS: Ferroelectric materials, Platinum, Optical coatings, Electrodes, Fiber coatings, Optical fibers, Zinc oxide, Phase shifts, Actuators, Annealing

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Proceedings Article | 22 December 1993 Paper

Optical low-coherence reflectometry of efficient Bragg gratings in optical fiber

Hans Limberger, Pierre-Yves Fonjallaz, Patrick Lambelet, Rene-Paul Salathe, Christophe Zimmer, H. Gilgen

Proceedings Volume 2044, (1993) https://doi.org/10.1117/12.165670

KEYWORDS: Optical fibers, Reflectivity, Fiber Bragg gratings, Reflectometry, Mirrors, Germanium, Modulation, Standards development, Telecommunications, Light emitting diodes

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Showing 5 of 12 publications

SPIE Conference Volume | 20 April 2006

Reliability of Optical Fiber Components, Devices, Systems, and Networks III

SPIE Conference Volume | 10 September 2004

Reliability of Optical Fiber Components, Devices, Systems, and Networks II

SPIE Conference Volume | 30 April 2003

Reliability of Optical Fiber Components, Devices, Systems, and Networks

Conference Committee Involvement (3)

Reliability of Optical Fiber Components, Devices, Systems, and Networks III

3 April 2006 | Strasbourg, France

Reliability of Optical Fiber Components, Devices, Systems, and Networks II

27 April 2004 | Strasbourg, France

Reliability of Optical Fiber Components, Devices, Systems and Networks

28 October 2002 | Bruges, Belgium

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