Hybrid glass coatings for optical fibers: effect of coating thickness on strength and dynamic fatigue characteristics of silica fibers

2006 ◽  
Author(s):  
A. B. Wojcik ◽  
M. J. Matthewson ◽  
K. T. Castelino ◽  
J. Wojcik ◽  
A. Walewski
Keyword(s):  
Optical Fibers ◽  
Coating Thickness ◽  
Silica Fibers ◽  
Fatigue Characteristics ◽  
Dynamic Fatigue

Identification of Nanocrystalline Inclusions in Bismuth-Doped Silica Fibers and Preforms

2016 ◽  
Vol 22 (5) ◽  
pp. 987-996 ◽  
Author(s):  
Liudmila D. Iskhakova ◽  
Filipp O. Milovich ◽  
Valery M. Mashinsky ◽  
Alexander S. Zlenko ◽  
Sergey E. Borisovsky ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Room Temperature ◽  
Optical Loss ◽  
Laser Generation ◽  
Dopant Distribution ◽  
X Ray ◽  
The Core ◽  
Silica Fibers ◽  
Transmission Electron ◽  
Bismuth Concentration

AbstractThe nature of nanocrystalline inclusions and dopant distribution in bismuth-doped silicate fibers and preforms are studied by scanning and transmission electron microscopy, and energy and wavelength-dispersive X-ray microanalysis. The core compositions are Bi:SiO2, Bi:Al2O3–SiO2, Bi:GeO2–SiO2, Bi:Al2O3–GeO2–SiO2, and Bi:P2O5–Al2O3–GeO2–SiO2. Nanocrystals of metallic Bi, Bi2O3, SiO2, GeO2, and Bi4(GeO4)3 are observed in these glasses. These inclusions can be the reason for the background optical loss in bismuth-doped optical fibers. The bismuth concentration of 0.0048±0.0006 at% is directly measured in aluminosilicate optical fibers with effective laser generation (slope efficiency of 27% at room temperature).

Effect of coating thickness on thermal stresses in tungsten-coated optical fibers

2000 ◽  
Vol 87 (8) ◽  
pp. 3759-3762 ◽  
Author(s):  
Sham-Tsong Shiue ◽  
Pin-Tzu Lien ◽  
J.-L. He
Keyword(s):  
Optical Fibers ◽  
Coating Thickness ◽  
Thermal Stresses

Activation Energy for Strength Degradation of Fused Silica Optical Fibers

1998 ◽  
Vol 531 ◽  
Author(s):  
Yunn-Shin Shiue ◽  
M. John Matthewson
Keyword(s):  
Activation Energy ◽  
Optical Fibers ◽  
Pure Water ◽  
Strength Degradation ◽  
Fused Silica ◽  
Static Fatigue ◽  
Buffer Solution ◽  
Silica Fibers ◽  
Apparent Activation Energies ◽  
Stress Dependent

AbstractThe strength degradation behavior of fused silica optical fiber is well known to be sensitive to the temperature and an apparent activation energy can be determined. In addition, it has been observed that the activation energy also depends on the applied stress and the nature of the environment. However, no consistent model for this behavior has emerged. We propose a chemical kinetics model which accounts for the temperature dependence of the dissociation of water which predicts that degradation should be faster in pH 7 buffer than in pure water. Static fatigue of fused silica fibers in both water and pH 7 buffer solution has been carefully studied as a function of temperature to test the model. The apparent activation energies are stress dependent, and, while the dependency is not clear, different environments give different dependencies. These observations support the proposed model.

Utlra-Thermostable Long-Period Gratings Written in Nitrogen-Doped Silica Fibers

1998 ◽  
Vol 531 ◽  
Author(s):  
V. I. Karpov ◽  
M. V. Grekov ◽  
E. M. Dianov ◽  
K. M. Golant ◽  
R. R. Khrapko
Keyword(s):  
Refractive Index ◽  
Optical Fibers ◽  
Effective Refractive Index ◽  
Nitrogen Doped ◽  
Fiber Core ◽  
Long Period ◽  
Silica Fibers ◽  
Long Period Gratings ◽  
Silica Core

AbstractLong-period gratings were written in nitrogen-doped-silica-core optical fibers by point heating. The periodic variations of the effective refractive index were induced via diffusion of nitrogen from the fiber core. It is shown experimentally that such gratings remain functional at temperatures of up to 1200 °C.

Strength-Flaw Relationship of Corroded Pristine Silica Studied by Atomic Force Microscopy

1994 ◽  
Vol 332 ◽  
Author(s):  
Qian Zhong ◽  
Daryl Inniss ◽  
Charles R. Kurkjian
Keyword(s):  
Optical Fibers ◽  
Strength Degradation ◽  
Force Microscopy ◽  
Silica Glasses ◽  
Spatially Resolved ◽  
Atomic Force ◽  
Silica Fibers ◽  
Surface Flaws ◽  
Relationship Of ◽  
Microscopic Surface

ABSTRACTGlass strength is controlled by microscopic surface flaws. Attempts to quantify the strengthflaw relationship for corroded silica fibers have been unfruitful, principally because of the difficulty in identifying the nanometer-sized, strength-controlling flaws on a uniformly corroded surface. In this paper, studies on corrosion of pristine silica optical fibers by HF vapor are presented. The HF-treated fibers exhibit strength degradation and contain well-defined, spatially-resolved surface flaws, which are characterized with an atomic force microscope. Excellent strength agreement is obtained for all chemically corroded fibers when the flaws are modeled as partially embedded hemispheres (i.e., blunt flaws). The implication of these results to the corrosion and fatigue process of silica glasses is discussed, since all previous analyses have assumed the strength-controlling flaws to be sharp.

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