Optical Tuning of Er/Yb Co-doped Fiber Bragg Gratings by Side Pumping

2016 ◽  
Author(s):  
Zhaoming Liu ◽  
Xuewen Shu
Keyword(s):  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Side Pumping ◽  
Co Doped

scholarly journals Strain Measurement on Cracks Using Fiber Bragg Gratings for Use in Aircraft Composite Skin Repairs

Aerospace ◽  
2020 ◽  
Vol 7 (9) ◽  
pp. 138
Author(s):  
Aris A. Ikiades
Keyword(s):  
Spectral Characteristics ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Stress Fields ◽  
Composite Repair ◽  
Local Stresses ◽  
Fbg Sensors ◽  
Critical Components ◽  
Co Doped

Fiber Bragg grating (FBG) sensors have been widely used for measurements of strain and temperature in a host of different applications, including aerospace in composite wings, fuselage structures, and other critical components. Here, we report on a method to measure highly localized intense stress fields, generated at the initialization point of a crack, or crack-tip, using Fiber Bragg Gratings (FBG) inscribed in highly photosensitive hydrogenated germanium and boron co-doped fiber. From the spectral characteristics of short and long FBGs, bonded on a test aluminum coupon with a crack, which simulated damaged skins of an aircraft, the local stresses near the cracks were measured and assessed. As a case study, bespoke composite repair patches were designed and bonded on a coupon, incorporating a number of gratings to monitor the stress distribution with applied force in the composite patch, near the crack.

scholarly journals Highly Reflective Fiber Bragg Gratings Inscribed in Ce/Tm Co-Doped ZBLAN Fibers

2013 ◽  
Vol 25 (11) ◽  
pp. 1066-1068 ◽  
Author(s):  
Mohammed Saad ◽  
Lawrence R. Chen ◽  
Xijia Gu
Keyword(s):  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Co Doped

Fabrication of Fiber Bragg Gratings in High Germania Boron Co-doped Optical Fiber by the Phase Mask Method

2012 ◽  
Author(s):  
Sulaiman Wadi Harun ◽  
Prabakaran Poopalan ◽  
Harith Ahmad
Keyword(s):  
Optical Fiber ◽  
Key Words ◽  
Continuous Wave ◽  
Uv Light ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Phase Mask ◽  
Uv Laser ◽  
Bragg Wavelength ◽  
Co Doped

Kaedah untuk menghasilkan peranti FBG yang mempunyai peratus pantulan yang tinggi diperkenalkan. Peranti FBG telah dicetak dalam gentian optik khas yang mengandungi germanium dan boron yang tinggi. Kandungan germanium ion di dalam gentian optik teras adalah sebanyak mol 20%. Cara yang digunakan ialah cara percetakan topeng fasa dengan menggunakan cahaya ultra ungu ion yang mempunyai panjang gelombang 244 nm sebagai sumber cahaya. Kami telah berjaya menghasilkan FBG yang mempunyai peratus pantulan setinggi 99.9% dan masa yang diambil untuk cetakan adalah kurang daripada 10 minit. Kata kunci: gentian optik; peranti FBG; laser UV; panjang gelombang Bragg; topeng fasa A technique to fabricate high reflectivity fiber Bragg gratings (FBGs) with minimal optics is presented. The FBG is written in high germania boron co-doped optical fiber using a phase mask with a 244 nm continuous-wave UV light as the printing source. The mol percentage of germania ion in the fiber core is about 20%. We have successfully fabricated FBGs with reflectivity as high as 99.9% in less than 10 minutes of exposure time. Key words: Optical fiber; fiber Bragg grating; UV laser; Bragg wavelength; phase mask

scholarly journals Fabrication and thermal decay of fiber Bragg gratings in pristine and H_2-loaded Bi-Al co-doped optical fibers

2011 ◽  
Vol 19 (26) ◽  
pp. B350 ◽  
Author(s):  
Georgios Violakis ◽  
Hans G. Limberger ◽  
Valery M. Mashinsky ◽  
Evgeny M. Dianov
Keyword(s):  
Optical Fibers ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Thermal Decay ◽  
Co Doped
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