Results 211 to 220 of about 8,929 (253)

Long-period gratings in wavelength-scale microfibers

Optics Letters, 2009
We report the fabrication of long-period gratings (LPGs) in wavelength-scale microfibers with diameters from 1.5 to 3 microm. The LPGs were fabricated by use of a femtosecond IR laser to periodically modify the surface of the fibers. These LPGs have grating periods of a few tens of micrometers, much smaller than those in conventional optical fibers.
Xuan, H, Jin, W, Liu, S
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3D Printed Long Period Grating Filters

Frontiers in Optics 2016, 2016
We have created affordable tunable optical fiber filters using 3D printed periodic structures acting as long fiber period grating.
Victor Lambin Iezzi, Jean-Sébastien Boisvert, Sébastien Loranger, Raman Kashyap   +3 more
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Optical fiber long-period grating sensors

Optics Letters, 1996
We present a novel class of highly sensitive sensors based on long-period fiber gratings that can be implemented with simple and inexpensive demodulation schemes. Temperature, strain, and refractive-index resolutions of 0.65 degrees C, 65.75 micro, and 7.69 x 10(-5), respectively, are demonstrated for gratings fabricated in standard telecommunication ...
V, Bhatia, A M, Vengsarkar
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Arc-Induced Long-Period Gratings

Fiber and Integrated Optics, 2005
Abstract The electric arc technique allows the inscription of long-period gratings (LPGs) virtually in all types of fibers, including non-photosensitive fibers, the case of non-Ge–doped photonic crystal fibers being of particular interest. LPGs written in standard fibers using this technique have shown a high thermal stability.
G Rego, P V S Marques, J L Santos
exaly   +2 more sources

Long-period fiber gratings

Bragg Gratings, Photosensitivity, and Poling in Glass Fibers and Waveguides: Applications and Fundamentals, 1997
Long period fiber gratings that couple light from guided core modes to non-guided cladding modes provide a means of introducing wavelength dependent losses in optical fiber systems.1 As a result, these in-fiber devices have found use as gain-equalizers in broadband optical fiber amplifiers,2 as band-rejection filters in high-power cascaded Raman fiber ...
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Long-period fiber grating by electrical discharge

24th European Conference on Optical Communication. ECOC '98 (IEEE Cat. No.98TH8398), 2002
Long-period gratings were manufactured by applying step by step an electric discharge through a standard telecommunication fibre. The induced perturbation was so large that less than 20 steps are necessary to obtain a coupling length.
N. Godbout, X. Daxhelet, A. Maurier, S. Lacroix   +3 more
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Long-period gratings in planar optical waveguides

Applied Optics, 2002
We present a theoretical analysis of light propagation in a four-layer planar waveguide that consists of a long-period grating (LPG) having a period of the order of 100 microm. By means of the coupled-mode theory, we show that such a structure is capable of coupling light from the fundamental guided mode to the cladding modes at specific wavelengths ...
Vipul, Rastogi, Kin Seng, Chiang
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All-optical switching in long-period fiber gratings

Optics Letters, 1997
Nonlinear pulse propagation in long-period fiber gratings is studied with a mode-locked Q -switched laser pulse approximately 80ps in duration at a wavelength of 1.05 microm . Optical switching, pulse reshaping, and optical limiting are found at intensities in the range of 1-20 GW/cm(2).
R E Slusher, J B Stark, A M Vengsarkar
exaly   +3 more sources

Electronically reconfigurable superimposed waveguide long-period gratings

Journal of the Optical Society of America A, 2002
The perturbation to the refractive index induced by a periodic electric field from two systems of interdigitated electrodes with the electrode-finger period l is analyzed for a waveguide with an electro-optically (EO) active core-cladding. It is shown that the electric field induces two superimposed transmissive refractive-index gratings with different
Mykola, Kulishov, Xavier, Daxhelet, Mounir, Gaidi, Mohamed, Chaker   +3 more
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Sensitivity enhancement of long period gratings for temperature measurement using the long period grating pair technique

Sensors and Actuators A: Physical, 2008
Abstract An approach to enhance the sensitivity achievable with long period grating (LPG) technology for temperature measurement, by using a LPG pair technique to create Mach-Zehnder interferometers written into B–Ge co-doped optical fibres, is presented.
Samer K. Abi Kaed Bey, Tong Sun, Kenneth T.V. Grattan   +2 more
openaire   +1 more source