Radiation-Induced-Defects Localization in Single-Mode Optical Fibers

2005 ◽  
pp. 329-332
Author(s):  
Sylvain Girard ◽  
A. Boukenter ◽  
Y. Ouerdane ◽  
J.-P. Meunier
Keyword(s):  
Optical Fibers ◽  
Single Mode ◽  
Radiation Induced ◽  
Induced Defects

Radiation-Induced-Defects Localization in Single-Mode Optical Fibers

2005 ◽  
Vol 480-481 ◽  
pp. 329-332 ◽  
Author(s):  
Sylvain Girard ◽  
A. Boukenter ◽  
Y. Ouerdane ◽  
J.-P. Meunier
Keyword(s):  
Optical Fibers ◽  
Single Mode ◽  
Wavelength Dependence ◽  
Radiation Sensitivity ◽  
Color Centers ◽  
Strong Interactions ◽  
Radiation Induced ◽  
Different Color ◽  
Induced Defects

We studied the defects at the origins of the permanent radiation-induced attenuation in four g-rays irradiated single-mode germanosilicate optical fibers (~1 MeV; 1.2 kGy; 0.3 Gy/s) in the spectral range 400 - 1700 nm. We determined the wavelength dependence of the following cladding codopant influences: germanium (0.3 %), phosphorus (0.3 %), fluorine (0.3 %) on the germanosilicate (13 %) fiber radiation responses. We identified some of the different color centers produced by g-rays and we evaluated their localization in the fiber cross-section through the determination of the radial distribution of the radiation-induced absorption at 633 nm. We also evidenced the strong interactions between these three codopants. In particular, our results showed that the properties of the phosphorus-related color centers, which mainly determine the fiber infrared radiation sensitivity, are strongly influenced by the germanium- and fluorine-codoping.

Gamma-radiation-induced degradation of actively pumped single-mode ytterbium-doped optical fibers

2014 ◽  
Author(s):  
B. Singleton ◽  
J. Petrosky ◽  
M. Pochet ◽  
N. G. Usechak ◽  
S. A. Francis
Keyword(s):  
Gamma Radiation ◽  
Optical Fibers ◽  
Single Mode ◽  
Radiation Induced

scholarly journals Real-time Ultraviolet Radiation Sensor Based on Modified Cladding Optical Fibers Technology

2021 ◽  
pp. 4667-4673
Author(s):  
Nadia F. Muhammed ◽  
Aseel I. Mahmood ◽  
Shehab A. Kadhim ◽  
Intisar A. Naseef ◽  
Ashwaq A. Jabor ◽  
...  
Keyword(s):  
Uv Radiation ◽  
Optical Fibers ◽  
Near Infrared ◽  
Single Mode ◽  
Radiation Energy ◽  
Peak Wavelength ◽  
Fiber Sensors ◽  
Radiation Sensor ◽  
All Optical ◽  
Radiation Induced

      In this work, the performance of single-mode optical fibers (SMFs) for ultraviolet (UV) radiation monitoring and dosimetry applications is presented. In particular, this work will focus on the Radiation-Induced Absorption (RIA) phenomena in the Near-Infrared domain (NIR). Such phenomena play a very important role in the sensing mechanism for SMF. Single mode fibers with a diameter of 50 µm were used for this purpose. These fibers were dipped into germanium (Ge) solution with different concentrations (1, 3, and 5 wt%) to produce the sensing part of the sensor. For all optical fiber sensors under investigation, the results indicated the dependence of the RIA on the applied UV radiation energy. Also, a redshift in peak wavelength was obtained. The influence of Ge concentration on sensing efficiency was studied and the best results were obtained with 3 wt% concentration as compared to 1 wt % and 5 wt % concentrations. The presented sensor shows good sensitivity to UV radiation which makes it possible to be applied in medical applications.

UV-Radiation Induced Color Centers in Optical Fibers

1985 ◽  
Vol 61 ◽  
Author(s):  
J. Simpson ◽  
J. Ritger ◽  
F. DiMarcello
Keyword(s):  
Oxygen Vacancy ◽  
Optical Fibers ◽  
Esr Spectra ◽  
Color Centers ◽  
Broad Absorption ◽  
Short Wavelength Range ◽  
Phosphorus Containing ◽  
Radiation Induced ◽  
Uv Dose ◽  
Induced Defects

ABSTRACTParamagnetic color centers have been observed in germanium silicate and germanium phosphosilicate multimode optical fiber exposed to broadband ultraviolet light (2–5 eV). These centers are characterized by an ESR and optical absorption similar to 1 meV and 100 keV radiation induced defects and show an apparent saturation as the UV dose approaches 100 J/cm2. The UV induced ESR spectra are not identical to that induced by 60Co radiation however, similar Ge(2) and Ge(3) germanium defect signatures are apparent. For both compositions these centers are characterized by a rapidly increasing loss from 1.0 to 0.5 µm with an additional broad absorption peak at 1.5 µm for the phosphorus containing cores. We suggest that the UV induced optical absorptions for both compositions in the short wavelength range are due in part to the Ge(2) germanium substitutional sites and expect that the 1.5 µm absorption is due to the P1 phosphorus oxygen vacancy.

Effects of Defect Modification and Reduction Techniques on the Radiation Sensitivity of Optical Fibers

1986 ◽  
Vol 88 ◽  
Author(s):  
T. Wei ◽  
M. P. Singh ◽  
W. J. Miniscalco ◽  
J. A. Wall
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Measurement Techniques ◽  
Inverse Correlation ◽  
Radiation Sensitivity ◽  
Interfacial Stress ◽  
Γ Irradiation ◽  
Graded Index ◽  
Radiation Induced ◽  
Induced Defects

ABSTRACTWe have investigated the relationship of precursor defects in as-drawn optical fiber to glass composition and processing conditions in order to understand the radiation sensitivity of doped-core optical fiber. Techniques are reported for improving the radiation hardness of graded-index multimode fibers through reducing the concentration of doping- and processing-induced defects as well as modifying the residual defects in as-drawn fiber. Significant decreases in radiation-induced loss have been observed for fibers pretreated with hydrogen. An investigation of the role of drawing-induced defects indicates that a lower draw temperature produces slightly harder fiber. A study of core/clad interfacial stress revealed that such stress does not play a major role in radiation sensitivity.Measurement techniques included in situ loss measurements at 850 nm and spectral loss measurements before and after -γ irradiation. In addition, photoluminescence proved to be an effective tool for characterizing specific defect centers. It was found for Ge/P-codoped fibers that the luminescence band at 650 nm attributed to drawing/radiation induced centers has an inverse correlation with induced loss. Previously unreported emission bands have been observed, including one at 720 nm which may be related to fluorine doping.

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