Results 261 to 270 of about 45,769 (300)

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, H. M. SALGADO   +3 more
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Tunable long-period fiber grating

SPIE Proceedings, 2003
Long-period fiber grating (LPFG) having grating periodicity in the hundreds of microns, functions as a band rejection filter. This device is useful for gain equalizing applications of fiber amplifiers.The transmission characteristics are mainly determined by the initial fabricating conditions such as grating periodicity and UV exposure time. Therefore,
Hisami Nishi, Akira Matsumura, Junji Nishii   +2 more
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Tunable mechanically induced long-period fiber gratings

Optics Letters, 2000
We report the experimental characterization of mechanically induced long-period fiber gratings (LPFG's) made by pressing a plate with periodic grooves against a short length of fiber. This filter, which is simple and inexpensive, exhibits transmission spectra and temperature stability similar to those of photoinduced LPFG's.
S, Savin, M J, Digonnet, G S, Kino, H J, Shaw   +3 more
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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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Magnetic-force-induced long-period fiber gratings

Optics Letters, 2012
A novel formation method of a long-period fiber grating (LPFG) based on a magnetic-force-induced microbend is proposed and experimentally demonstrated. The LPFG employs a permanent magnet that exerts transversal force to the fiber by attracting a steel coil spring.
Hajime, Sakata, Kosuke, Yamahata
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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
openaire   +2 more sources

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
openaire   +2 more sources

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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Sensitivity characteristics in nanosized coated long period gratings

Applied Physics Letters, 2006
This work presents an experimental analysis of the sensitivity characteristics to the surrounding refractive index (SRI) in long period gratings coated with polymeric overlay with high refractive index and thickness values ranging in hundreds of nanometers.
Cusano A, Pilla P, IADICICCO, Agostino, CAMPOPIANO, Stefania, Giordano M, Cutolo A.   +5 more
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Random period arc-induced long-period fiber gratings

Optics & Laser Technology, 2012
Abstract We report the fabrication of arc-induced long-period fiber gratings with strong random variations in the period. Long-period fiber gratings with standard deviations in the period from 8.50 to 36.98 μm were fabricated. The spectral position of the resonant bands is determined by the average period value, being similar to that observed in a ...
A. Martinez-Rios, I. Torres-Gomez, D. Monzon-Hernandez, G. Salceda-Delgado, V.M. Duran-Ramirez, G. Anzueto-Sanchez   +5 more
openaire   +1 more source