Defect centers in a pure‐silica‐core borosilicate‐clad optical fiber: ESR studies

1976 ◽  
Vol 47 (3) ◽  
pp. 960-967 ◽  
Author(s):  
D. L. Griscom ◽  
G. H. Sigel ◽  
R. J. Ginther
Keyword(s):  
Optical Fiber ◽  
Pure Silica ◽  
Defect Centers ◽  
Silica Core

Color Centers in Glass Optical Fiber Waveguides

1985 ◽  
Vol 61 ◽  
Author(s):  
E. J. Friebele ◽  
D. L. Griscom
Keyword(s):  
Optical Fiber ◽  
Region Of Interest ◽  
Nuclear Radiation ◽  
Color Centers ◽  
Metal Fluoride ◽  
Paramagnetic Defect ◽  
Pure Silica ◽  
Defect Centers ◽  
Radiation Induced ◽  
Fiber Waveguides

ABSTRACTColor centers formed in the core and cladding of optical fiber waveguides by exposure to nuclear radiation can greatly increase the attenuation in the infrared spectral region of interest for optical communications. The radiation-induced paramagnetic defect centers in pure silica, silica doped with Ge, P, or B, and heavy metal fluoride glasses have been identified and thoroughly characterized by electron spin resonance (ESR) techniques. This paper will review the results of recent studies of color centers in optical fiber waveguide materials and their Identification via correlations of the radiation-induced optical absorptions and defect centers elucidated by ESR.

50Um Diameter Pure Silica Core/55Um Diameter Hard-Clad Optical Fiber

1989 ◽  
Author(s):  
James P. Clarkin ◽  
B. J. Skutnik ◽  
G. A. Drenzek
Keyword(s):  
Optical Fiber ◽  
Pure Silica ◽  
Silica Core

Defect centers in a germanium‐doped silica‐core optical fiber

1974 ◽  
Vol 45 (8) ◽  
pp. 3424-3428 ◽  
Author(s):  
E. J. Friebele ◽  
D. L. Griscom ◽  
G. H. Sigel
Keyword(s):  
Optical Fiber ◽  
Defect Centers ◽  
Silica Core

Modeling of Radiation Heat Transfer in the Drawing of an Optical Fiber With Multilayer Structure

2006 ◽  
Vol 129 (3) ◽  
pp. 342-352 ◽  
Author(s):  
Chunming Chen ◽  
Yogesh Jaluria
Keyword(s):  
Heat Transfer ◽  
Optical Fiber ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Band Model ◽  
Fiber Drawing ◽  
Pure Silica ◽  
Radiation Properties ◽  
Optical Fiber Drawing ◽  
Silica Core

A numerical model is developed to study the radiative heat transfer in a furnace for optical fiber drawing with a core-cladding structure in the fiber. The focus is on the effect of the difference in composition and thus the radiation properties in the two regions on radiative transport. The zonal method is applied to calculate the radiative heat transfer within the neck-down region of the preform. The radiative heat transfer between the preform and the furnace is computed by an enclosure analysis. A parallel computational scheme for determining the direct exchange areas is also studied. The radiation model is verified by comparisons with benchmark problems. Numerical results for a pure silica preform, a GeO2-doped silica core with a pure silica cladding preform, and a pure silica core with a B2O3-doped silica cladding preform are presented. Radiation properties for these are obtained from the literatures and a three-band model is developed to represent the values. It is found that radiative heat flux on the surface of the preform is strongly affected by the differences in the absorption coefficient due to doping. However, changes of about 1% in the refractive index have only a small effect on radiative heat transfer. The basic approach is outlined in order to form the basis for simulating optical fiber drawing processes, which typically involve fibers and preforms with a core and a cladding. Furthermore, the approach can apply to estimate the multi-layer fiber drawing, which is of interest in the fabrication of specialty fibers that have been finding uses in a variety of practical applications. The model can be extended to other similar processes, which involve multiple regions with different radiation properties. The main interest in this study is on the approximate representation of radiation properties and on the modeling of the transport process.

Microstructured Silica as an Optical-Fiber Material

MRS Bulletin ◽  
2001 ◽  
Vol 26 (8) ◽  
pp. 614-617 ◽  
Author(s):  
J.C. Knight ◽  
T.A. Birks ◽  
B.J. Mangan ◽  
P.St.J. Russell
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Guided Waves ◽  
Fiber Material ◽  
Drawing Process ◽  
Regular Pattern ◽  
Pure Silica ◽  
Fiber Waveguides ◽  
Silica Core ◽  
Cladding Material

Conventional optical fibers are fabricated by creating a preform from two different glasses and drawing the preform down at an elevated temperature to form a fiber. A waveguide core is created in the preform by embedding a glass with a higher refractive index within a lower-index “cladding” material. Over the last few years, researchers at several laboratories have demonstrated very different forms of optical-fiber waveguides by using a drawing process to produce two-dimensionally microstructured materials in the form of fine “photoniccrystal fibers” (PCFs). One such waveguide is represented schematically in Figure 1. It consists of a silica fiber with a regular pattern of tiny airholes that run down the entire length. The optical properties of the microstructured silica cladding material enable the formation of guided waves in the pure silica core.

Pulsed X‐Ray Radiation Response of Ultra‐Low Loss Pure‐Silica‐Core Optical Fiber

2021 ◽  
Author(s):  
Vincenzo De Michele ◽  
Claude Marcandella ◽  
Adriana Morana ◽  
Cosimo Campanella ◽  
Jeoffray Vidalot ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Radiation Response ◽  
Low Loss ◽  
X Ray ◽  
Pure Silica ◽  
Silica Core
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