In this review, from the angle of refractive index spatial modulation, we extract three characteristic parameters of LPFG:grating period length, index modulated depth and normal orientation of grating...
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Specifically, long period gratings (LPG) have been mechanically induced in different optical fibers through a 3D printed nearly sinusoidal grooved structure. LPGs have been mechanically induced in
Attention is paid to study the delay response of the grating, by varrying physical parameters like incident wavelength and coupling strength of grating. Negative values of group delay
We demonstrate the sensing characteristics of high-order cladding mode by inscribing long-period fiber grating and helical long-period grating in double-cladding fiber.
Abstract and Figures Long-period fiber gratings (LPFGs) functioning as band-reject filters have played a pivotal role in the realm of optical communication.
Advantages of long-period grating (LPG) based optical fibers for sensing applications along with different fabrication techniques to draw grating on the core of fiber have been reviewed. Some advantages
3. Long period gratings in D-shaped fibers short-period FBGs is their intrinsic SRI sensitivity. Nevertheless, the fiber section geometry strongly influences the sensitivity characteristics of the
We expound new techniques of LPFG fabrication, such as multi-exposure, apodized exposure, outfield action, coating and filling, fiber incised and welded, multi-dimensional modulation, and show some
Abstract We demonstrate the refractive index (RI) sensing characteristics of long-period gratings (LPGs) in linearly arranged three-core fiber (TCF), which are fabricated using arc discharge
A new D-shape fiber long period fiber grating (DLPFG) curvature sensor has been experimentally proposed and theoretically investigated, LPFG was directly inscribed on polished area
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Sensitivity characteristics of long-period fiber gratings Abstract: We present a detailed investigation into the sensitivity of long-period fiber gratings (LPFGs) as a function of temperature, strain, and
Decades have passed since the first demonstration of a long-period fiber grating (LPFG) and its practical application for sensors, and, in this period, manufacturing techniques, sensitivity
Abstract: This paper reports the outcomes of the tests that we conducted as online measurements for the evaluation of one optical fiber long-period grating produced by a fusion
2. Fabrication methods of long-period fibre gratings The inscription of long-period gratings on optical fibre basically consists in the generation of a periodical perturbation of the refractive index in the
Long period fiber gratings (LPFGs) with different spectral characteristics were fabricated with 1 kHz, 50 fs laser pulses. The contrast of resonant rejection band can be significantly increased
This paper presents mechanically induced long-period gratings (MILPGs) realized in standard and unconventional optical fibers, like not-photosensitive double-clad and photonic crystal
This paper presents a review of the evolution of LPFGs, with a specific focus on the progression and current trends of mechanically induced long-period fiber gratings.
A phase-shifted long period fiber grating based on filament heating method for simultaneous measurement of strain and temperature Wenlei Yang, Tao Geng, Jun Yang et al. Fibre
Abstract Fiber refractive index (RI) sensor shows superiority in various applications including biomedical detection and food chemistry. Herein, we propose and investigate a super
Long period fiber gratings (LPFGs) were fabricated in a standard single mode fiber (SMF-28e) through femtosecond (fs) laser direct writing. LPFGs with longer and shorter periods were fabricated, which
Combined with the mobile platform and optical measurement platform with high precision, this paper built an optical fibre strain sensor measurement system based on the deep
Long period gratings, based on anti-resonant hollow core fibers (AR-HCFs), are fabricated using a high-frequency CO 2 laser pulse by carving
The strain response of a long-period fibre grating arise due to the physical elongation of the fibre, changing the grating pitch and the effective refractive index of the core and cladding due to the
The fabrication of long period fiber gratings (LPFGs) based on thin-cladding fiber (TCF) has been demonstrated by adopting electric-arc discharge (EAD) technique. In order to analyze the
We propose a novel tilted long period fiber grating (TLPFG) design, inscribed using a line-by-line inscription technique and an infrared femtosecond
In this work, we conducted experimental and theoretical investigations on gamma radiation sensitivity of Long Period Gratings (LPGs), fabricated by electric arc discharge technique in two
In this study, we report on a tilted long period fiber grating (TLPFG) fabricated using an infrared Fs laser and a line-by-line inscription method. This
Abstract We evaluated comparatively the radiation sensitivity of two long period gratings (LPGs) manufactured in a SMF28™ optical fiber through the melting-drawing method based on CO2
We present a detailed investigation into the sensitivity of long-period fiber gratings (LPFGs) as a function of temperature, strain, and surrounding refractive index, with particular attention to the higher order
However, there are only few reports concerning the behavior of long period optical fiber gratings (LPGs) under gamma ray irradiation. Off-line tests run on LPGs inscribed with a CO laser in
In order to analyze the sensing characteristics of arc-induced TCF LPFGs, the refractive index (RI), temperature and strain sensing characteristics were also experimentally investigated,