Results 181 to 190 of about 2,986 (210)

Femtosecond-written long-period gratings in fluoride fibers

Optics Letters, 2018
Long-period gratings induced in fluoride glass fibers using femtosecond laser pulses at 800 nm are, to the best of our knowledge, demonstrated for the first time. By means of tightly confined ultrashort laser pulses, smooth periodic lines of refractive index changes are induced along the fiber core.
Maximilian, Heck, Stefan, Nolte, Andreas, Tünnermann, Réal, Vallée, Martin, Bernier   +4 more
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Structural long-period gratings in photonic crystal fibers

Optics Letters, 2002
We report what is believed to be the first example of structural long-period gratings written in pure silica photonic crystal fibers (PCFs). The gratings are realized by periodic collapse of the holes of the PCF by heat treatment with a CO(2) laser. The resulting periodic hole-size perturbation produces core-to-cladding-mode conversion.
G, Kakarantzas, T A, Birks, P St J, Russell   +2 more
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3D printed long period gratings for optical fibers

Optics Letters, 2016
We demonstrate a simple technique for implementing long period grating (LPG) structures by the use of a 3D printer. This Letter shows a way of manipulating the mode coupling within an optical fiber by applying stress through an external 3D printed periodic structure.
Victor Lambin, Iezzi, Jean-Sébastien, Boisvert, Sébastien, Loranger, Raman, Kashyap   +3 more
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Long-period fiber-grating-based gain equalizers

Optics Letters, 1996
Long-period fiber gratings are used to f latten the gain spectrum of erbium-doped fiber amplifiers. A broadband amplifier with
A M, Vengsarkar, J R, Pedrazzani, J B, Judkins, P J, Lemaire, N S, Bergano, C R, Davidson   +5 more
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Long-period fiber grating inscribed in a tapered fiber

Advanced Photonics Congress, 2012
A long-period fiber grating (LPFG) written in a tapered fiber was proposed and experimentally demonstrated. Strain sensitivity of the proposed LPFG based on a tapered fiber was improved to be -2.99 nm/mϵ.
Min-Seok Yoon, Hyun-Joo Kim, Young-Geun Han   +2 more
openaire   +1 more source

Long-period fiber gratings written in the microstructure specialty fibers

2013 6th IEEE/International Conference on Advanced Infocomm Technology (ICAIT), 2013
We demonstrate the fabrication of long-period fiber gratings (LPFGs) written by CO2 laser in different micro-structure specialty fibers. The characteristics of grating growth were studied by using the dynamic analysis of laser writing process. It can be believed that the residual stress relaxation, glass structure changes, and frozen of the non ...
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Long-period fiber grating: a specific design for biosensing applications

Applied Optics, 2017
In this paper, a detailed investigation on the modeling of long-period fiber grating (LPFG) sensors is discussed with the aim of providing a more realistic solution for their use in biosensing. Add-layer sensitivity, i.e., sensitivity of the sensor to an additional layer adhered onto the fiber surface, is quantified and a clear and complete analysis ...
Bandyopadhyay S, Biswas P, Chiavaioli F, Dey TK, Basumallick N, Trono C, Giannetti A, Tombelli S, Baldini F, Bandyopadhyay S   +9 more
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Flexible fabrication of long-period in-fiber gratings

Technical Digest. Summaries of Papers Presented at the Conference on Lasers and Electro-Optics. Conference Edition. 1998 Technical Digest Series, Vol.6 (IEEE Cat. No.98CH36178), 1998
We have demonstrated a novel, simple, low-cost and all-fiber interrogation technique for a strain/temperature fiber Bragg sensor using a long-period grating. We show the schematic diagram of the demodulation scheme. The amount of light transmitted by the long-period grating is determined by its wavelength and is therefore proportional to the wavelength
L.A. Everall, R.W. Fallon, J.A.R. Williams, L. Zhang, I. Bennion   +4 more
openaire   +1 more source

Splicer-based long-period fiber gratings

OFC '98. Optical Fiber Communication Conference and Exhibit. Technical Digest. Conference Edition. 1998 OSA Technical Digest Series Vol.2 (IEEE Cat. No.98CH36177), 2002
Summary form only given. Presents a one-step process for the fabrication of efficient, compact long-period gratings. The technique makes use ofa controlled arc to periodically modify an optical fiber by a pair of electrodes. The setup comprises a commercially available splicer whose fiber holding mechanism is replaced by a motorized stage, which allows
S.G. Kosinski, A.M. Vengsarkar
openaire   +1 more source

Long-Period Fiber Gratings and their Sensing Applications

International Conference on Fibre Optics and Photonics, 2012
Long-period gratings (LPGs) in optical fibers for sensing are discussed, especially on strain and temperature sensing. Low-cost fabrication by a low-pressure mercury-lamp exposure was described. LPGs in high-birefringence fiber had high strain sensitivity.
Toru Mizunami, Toshihiro Mori, Tsubasa Fujiyoshi   +2 more
openaire   +1 more source