Results 21 to 30 of about 16,371 (260)
Long-period gratings in chalcogenide fibers
Optics Express, 2006 We report the first demonstration of long period gratings in single mode As(2)Se(3) chalcogenide glass fiber. The grating is implemented by pressing a threaded rod against a short piece of fiber. Its strength can be tuned over a 25 dB range, has high repeatability, and is fully reversible.
Dominik, Pudo +2 more
openaire +2 more sources
Fiber Bragg Grating Bonding Characterization under Long-Period Cyclic Loading
Photonics, 2023 The Smart Landing Gear system to be developed in the framework of the ANGELA project provides the strain measurements on landing gear structure at landings, and this system should be maintained efficiently under operational conditions.
Angela Brindisi +7 more
doaj +1 more source
Long Period Gratings Formed in Depressed Cladding Fibres [PDF]
Bragg Gratings, Photosensitivity, and Poling in Glass Fibers and Waveguides: Applications and Fundamentals, 1997 There has been a significant interest in long period gratings, primarily due to their applications in gain-flattened erbium doped fibre amplifiers [1]. Up till now, cladding modes supported by the glass-air interface of an optical fibre have been used in a forward mode coupling scheme involving also the guided fundamental mode of the optical fibre ...
Dong, L., Reekie, L., Cruz, J.L.
openaire +3 more sources
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
doaj +1 more source
Raman suppression in high-power fiber laser oscillator by long period fiber grating
Results in Physics, 2021 Stimulated Raman scattering (SRS) is a major limiting factor for better performance of high-power fiber lasers. Several spectral filtering methods have been used for Raman suppression, among which long period fiber grating (LPFG) is relatively simple and
Qihao Hu +5 more
doaj +1 more source
Hybrid LPG-FBG Based High-Resolution Micro Bending Strain Sensor
Sensors, 2020 Sensitivity and reliability are essential factors for the practical implementation of a wearable sensor. This study explores the possibility of using a hybrid high-resolution Bragg grating sensor for achieving a fast response to dynamic, continuous ...
Song-Bi Lee +4 more
doaj +1 more source
Dynamic Responses Measured by Optical Fiber Sensor for Structural Health Monitoring
Applied Sciences, 2019 An optical fiber sensing system integrating a fiber Bragg grating (FBG) sensor, a long-period fiber grating (LPFG) optical filter and a photodetector is presented to monitor the dynamic response of a structure subjected to base excitation and impact ...
Shiuh-Chuan Her, Shin-Chieh Chung
doaj +1 more source
Virtual long-period fiber gratings [PDF]
SPIE Proceedings, 2004 In this paper a theoretical prediction of a new kind of in-fiber devices is presented. They behave essentially like long-period Bragg gratings except for the fact that they are not permanent but volatile. This is because these devices are not formed by the UV-induced increment of the refractive index but by the twisting of a pristine HiBi fiber.
Cesar Jauregui +5 more
openaire +1 more source
Fabrication of rGO-GO Long Period Fiber Grating Using Laser Reduction Method
IEEE Photonics Journal, 2017 A laser-reduction technique is investigated to fabricate a novel long period fiber grating (LPFG), whose period is a section of graphene oxide (GO) and reduced graphene oxide (rGO) films on a side polished fiber.
Liheng Chen +9 more
doaj +1 more source
Long Period Bragg Grating in Coaxial Transmission Lines
Journal of Microwaves, Optoelectronics and Electromagnetic ApplicationsThis 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 short pieces of the cable so that the discontinuities account for the variation in the medium ...
Sergio Luiz Stevan Jr +4 more
doaj +1 more source