Fabrication of Ultra-Weak Fiber Bragg Grating (UWFBG) in Single-Mode Fibers through Ti-Doped Silica Outer Cladding for Distributed Acoustic Sensing

2019 ◽  
Author(s):  
Jingyu Wu ◽  
Zhaoqiang Peng ◽  
Mohan Wang ◽  
Rongtao Cao ◽  
Ming Jun Li ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
Single Mode ◽  
Bragg Grating ◽  
Acoustic Sensing ◽  
Distributed Acoustic Sensing ◽  
Outer Cladding

scholarly journals Pressure and temperature dependence of fiber Bragg grating for acoustic sensing.

1999 ◽  
Vol 26 (4) ◽  
pp. 231-238 ◽  
Author(s):  
Nobuaki TAKAHASHI ◽  
Takahiro SAEKI ◽  
Kanta TETSUMURA ◽  
Sumio TAKAHASHI ◽  
Kazuo IMAMURA
Keyword(s):  
Temperature Dependence ◽  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Acoustic Sensing

scholarly journals Femtosecond-Laser-Assisted Fabrication of Radiation-Resistant Fiber Bragg Grating Sensors

2022 ◽  
Vol 12 (2) ◽  
pp. 886
Author(s):  
Hun-Kook Choi ◽  
Young-Jun Jung ◽  
Bong-Ahn Yu ◽  
Jae-Hee Sung ◽  
Ik-Bu Sohn ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Fiber Bragg Grating ◽  
Optical Fibers ◽  
Coming Out ◽  
Single Mode ◽  
Femtosecond Laser Irradiation ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Radiation Resistant ◽  
Fbg Sensors

This paper demonstrates the fabrication of radiation-resistant fiber Bragg grating (FBG) sensors using infrared femtosecond laser irradiation. FBG sensors were written inside acrylate-coated fluorine-doped single-mode specialty optical fibers. We detected the Bragg resonance at 1542 nm. By controlling the irradiation conditions, we improved the signal strength coming out from the FBG sensors. A significant reduction in the Bragg wavelength shift was detected in the fabricated FBG sensors for a radiation dose up to 105 gray, indicating excellent radiation resistance capabilities. We also characterized the temperature sensitivity of the radiation-resistant FBG sensors and detected outstanding performance.

Monitoring of single-mode fiber laser heating using Rayleigh scattering and first order fs-PbP fiber Bragg grating

2017 ◽  
Author(s):  
Rudy Desmarchelier ◽  
Romain Cotillard ◽  
Nicolas Roussel ◽  
Steven Armiroli ◽  
Guillaume Laffont
Keyword(s):  
Fiber Laser ◽  
Fiber Bragg Grating ◽  
Laser Heating ◽  
Rayleigh Scattering ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Bragg Grating ◽  
First Order

Raman suppression in a high-power single-mode fiber oscillator using a chirped and tilted fiber Bragg grating

2021 ◽  
Vol 18 (3) ◽  
pp. 035103
Author(s):  
Xiaofan Zhao ◽  
Xin Tian ◽  
Qihao Hu ◽  
Binyu Rao ◽  
Meng Wang ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
High Power ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Bragg Grating

Distributed acoustic sensing of subsea wells

2020 ◽  
Vol 39 (11) ◽  
pp. 801-807
Author(s):  
Andreas Ellmauthaler ◽  
Brian C. Seabrook ◽  
Glenn A. Wilson ◽  
John Maida ◽  
Jeff Bush ◽  
...  
Keyword(s):  
Single Mode ◽  
Field Trials ◽  
Single Mode Fiber ◽  
Optical Losses ◽  
Acoustic Sensing ◽  
Well Integrity ◽  
Sand Control ◽  
Processing Algorithms ◽  
Distributed Acoustic Sensing ◽  
Optical Circulator

Topside distributed acoustic sensing (DAS) of subsea wells requires advanced optical engineering solutions to compensate for reduced acoustic bandwidth, optical losses, and back reflections that are accumulated through umbilicals, multiple wet- and dry-mate optical connectors, splices, optical feedthrough systems, and downhole fibers. To address these issues, we introduce a novel DAS solution based on subsea fiber topology consisting of two transmission fibers from topside and an optical circulator deployed in the optical flying lead at the subsea tree. This solution limits the sensing fiber portion to the downhole fiber, located below the subsea tree, and enables dry-tree-equivalent acoustic sampling frequencies of more than 10 kHz while eliminating all back reflections from multiple subsea connectors above the tree. When combined with enhanced backscatter single-mode fiber, this gives rise to a DAS interrogation system that is capable of providing dry-tree-equivalent acoustic sensing performance over the entire length of the subsea well, regardless of the tie-back distance. It also enables the same spectral-based DAS processing algorithms developed for seismic, sand control, injector/producer profiling, and well integrity on dry-tree wells to be applied directly to subsea DAS data. The performance of this subsea DAS system has been validated through a series of laboratory and field trials. We show the results of the tests and discuss how the system is deployed within subsea infrastructure.

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