Mechanically Induced Long Period Gratings: Recent Progresses
In this framework, we report about fiber optic-based devices achieved with the support of stereolithography (SLA) printing technique. Specifically, long period gratings (LPG) have been
Structure-Modulated Long-Period Fiber Gratings (SM-LPFGs) represent an advancement in fiber optic sensor technology, moving beyond traditional photosensitivity-based fabrication to achieve enhanced pe...
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In this framework, we report about fiber optic-based devices achieved with the support of stereolithography (SLA) printing technique. Specifically, long period gratings (LPG) have been
The tapered LPFG was fabricated using resistive filament heating with a grating period of 4.8 mm, depicting an ultra-long-period fiber grating (ULPFG).
We report here, for the first time to our knowledge, the fabrication and characterisation of LPFGs with periods up to several millimetres. Potentially, these ultra-long-period gratings may offer
The Long Period Fiber Grating (LPFG) from AtGrating is an advanced optical component designed to enable selective attenuation of specific wavelengths in the transmission spectrum.
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
Arc-Induced Long Period Gratings from Standard to Polarization-Maintaining and Photonic Crystal Fibers In this work, we report about our recent results concerning the fabrication of Long Period
Abstract In this paper, the fabrication of arched fiber core based on single-mode fiber is first proposed and experimentally studied about the relevant sensing characteristics. A novel kind of
We report a novel all-fiber narrow-bandwidth intermodal Mach–Zehnder interferometer (MZI) based on a long-period fiber grating (LPFG) combined with a fiber bitaper, and the MZI has no
In this paper, we developed and experimentally evaluated a new type of long-period fiber grating. This structure is fabricated by CO2 laser polishing and subsequent heating with an
01 Grating structure optimization for enhanced coupling efficiency Optimization of grating parameters such as period, duty cycle, etch depth, and grating profile to maximize coupling efficiency
The present research paper provides information to design fiber-based Bragg''s grating structure to absorb and transmit the signals of 405 nm, 650 nm, and 780 nm wavelengths only.
This article presents a long-period fiber-grating sensor based on a congruent quasi-helical structure (CQH-LPFG) with the two-parameter
A humidity and temperature optical fiber sensor based on a long-period grating (LPG), which can provide simultaneous response to both magnitudes, is proposed and demonstrated via
Long-period gratings supported biosensing projects involving hundreds of prototypes, proving essential in Fiber Bragg Grating (FBG) Industry Analysis for future sensor miniaturization.
Nowadays, strong emphasis is given to structure health monitoring of various engineering and civil structures, which can be easily achieved with FBG-based
Why longer gratings help More grating periods mean more tiny reflections contributing coherently, which increases reflectivity and usually narrows the spectral feature.
Long-period fiber gratings (LPFGs) are efficient ways to achieve high-order core mode conversion and vortex mode conversion in few-mode fibers
A periodic interdigitated grooved structure, based on the stereo-lithography 3D printing technique, is developed for the grating formation in these fibers with simplicity and cost-effectiveness.
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
In this paper, we rigorously deduce the coupled-mode equations of a long-period fiber grating and fiber Bragg grating in their cascaded structure (CLBG), based on coupled-mode theory. Next, through the
It is an optical fiber structure with the properties periodically varying along the fiber, such that the conditions for the interaction of several copropagating modes are satisfied. The period of such a
This work shows the utilization of a coaxial cable for the fabrication of a long period Bragg grating. The grating is fabricated removing the dielectric in
Long period grating has a wide variety of applications, including band-rejection filters, gain flattening filter and sensors. Various gratings with complex structures have been designed: gratings combining
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
As mentioned above, achieving an ultra-high sensitivity is still a challenge. In this paper, we tried to apply a parallel Sagnac loop based on the VE to solve this long-standing problem. To our