Results 31 to 40 of about 5,314 (159)
Fibers, 2017 The manufacturing and spectral features of different types of long period fiber gratings (LPFGs), ranging from phase-shifted, turn-around point, and internally tilted gratings, to pseudo-random gratings, are described and discussed in detail.
Francesco Chiavaioli +2 more
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Sensors, 2021 In this work, we review the most important achievements of INESC TEC related to the properties and applications of arc-induced long-period fiber gratings.
Gaspar Rego +2 more
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Long-Period Fiber Gratings in Active Fibers
, 2013 Traditionally, long period fiber gratings (LPG) are made in passive optical fibers that have negligible loss. However, loss or gain that can be controlled via optical pumping adds a new degree of freedom and - as will be shown in this chapter - brings many new and interesting properties.
David Krmak +2 more
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Dissimilar-fiber long-period fiber gratings: concept and demonstration
Applied Optics, 2017 A new type of long-period fiber grating structure that contains dissimilar fiber types is proposed. This dissimilar-fiber long-period fiber grating (DF-LPFG) structure is fabricated by splicing together subperiod sections of dissimilar fiber types. Due to the large index differences that can exist between various fiber types, the resulting DF-LPFGs can
Pengfei, Wang, Thomas K, Gaylord
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Sensing Features of Long Period Gratings in Hollow Core Fibers [PDF]
Sensors, 2015 We report on the investigation of the sensing features of the Long-Period fiber Gratings (LPGs) fabricated in hollow core photonic crystal fibers (HC-PCFs) by the pressure assisted Electric Arc Discharge (EAD) technique. In particular, the characterization of the LPG in terms of shift in resonant wavelengths and changes in attenuation band depth to the
IADICICCO, Agostino +1 more
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Journal of Chemistry, 2020 A high temperature-sensitive long-period fiber grating (LPFG) sensor fabricated by the local fictive temperature modification is proposed and demonstrated.
Guorui Zhou +11 more
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Advanced Electromagnetics, 2018 In this paper, a high sensitivity temperature sensor based on photonic crystal fiber long period grating (PCF-LPG) filled with ethanol is proposed and simulated by full vector finite element method. The relationship between the resonant wavelength shift,
R. Boufenar, M. Bouamar, A. Hocini
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Simultaneous measurement of magnetic field and temperature based on magnetic fluid-clad long period fiber grating [PDF]
Journal of the European Optical Society-Rapid Publications, 2015 Simultaneous measurement of magnetic field and temperature is proposed and experimentalized with a magnetic fluid-clad long period fiber grating structure. Magnetic fluid is used as the surrounding material of the long period fiber grating.
Tang J., Pu S., Luo L., Dong S.
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Twist Sensor Based on Long Period Grating and Tilted Bragg Grating Written in Few-Mode Fibers
IEEE Photonics Journal, 2018 A twist sensor based on a few-mode long period grating (LPG) and a tilted fiber Bragg grating (TFBG) is proposed and demonstrated. The LPG, inscribed in a step index few-mode fiber by a CO2 laser, is utilized to excite the LP11 core mode.
Kang Yang +5 more
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Strong long-period fiber gratings recorded at 352?nm [PDF]
Optics Letters, 2005 We describe long-period grating inscription in hydrogenated telecom fibers by use of high-intensity femtosecond 352 nm laser pulses. We show that this technique allows us to fabricate high-quality 30 dB gratings of 300 microm period and 2 cm length by use of a three-photon absorption mechanism.
Dubov, Mykhaylo +3 more
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