Results 21 to 30 of about 16,245 (165)
Long Period Fibre Gratings [PDF]
, 2012 In essence, a long period fibre grating (LPFG) is an all-fibre device with wavelength dependent loss. As a band rejection filter, all light in a spectral slice is discarded without affecting the amplitude and phase of neighbouring wavelengths, with the additional advantage of low insertion losses and minimum backreflection (Daxhelet, 2003).
Alejandro Martinez-Rios +3 more
openaire +1 more source
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
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.
Jáuregui Misas, César +5 more
openaire +2 more sources
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
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
Arc-Induced Long Period Fiber Gratings [PDF]
Journal of Sensors, 2016 Long period fiber gratings produced by the electric arc technique have found an increasing interest by the scientific community due to their ease to fabricate, virtually enabling the inscription in any kind of fiber, low cost, and flexibility. In 2005 we have presented the first review on this subject.
openaire +1 more source
Long-period gratings in polymer ridge waveguides
Optics Express, 2005 We report the design and fabrication of long-period waveguide gratings (LPWGs) in benzocyclobutene (BCB) ridge waveguides. We apply an accurate perturbation theory to analyze the LPWGs. In particular, the phase-matching condition, the coupling coefficients, the temperature dependence of the resonance wavelength, the bandwidth, and the polarization ...
Q, Liu, K, Chiang, K, Lor
openaire +2 more sources
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
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