Author
J.E. Townsend
Bio: J.E. Townsend is an academic researcher from University of Southampton. The author has contributed to research in topics: Fabrication & Dopant. The author has an hindex of 1, co-authored 1 publications receiving 366 citations.
Topics: Fabrication, Dopant, Optical fiber, Doping
Papers
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TL;DR: In this article, a solution-doping technique for the reproducible fabrication of low-loss optical fibres containing up to 4000 parts in 106 rare-earth ions is described.
Abstract: A solution-doping technique is reported for the reproducible fabrication of low-loss optical fibres containing up to 4000 parts in 106 of rare-earth ions. The method produces excellent dopant uniformity and is sufficiently versatile to allow codoping with different ions.
382 citations
Cited by
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TL;DR: In this paper, the physical properties of R2O-ZnO-TeO2 glasses have been studied for their feasibility for fiber drawing and rare earth doping and a tellurite glass fiber with less than 1 dB/m loss has been made by the rod-in-tube method.
1,041 citations
TL;DR: In this article, the current status of fabrication methods, matching particular fibers for specific applications, together with optimizing the fiber for high efficiency, are presented, along with the current state of the art in fiber selection and fabrication.
Abstract: Erbium-doped fiber has become the central component of nearly all optical amplifiers. Applications reported include repeaters, power amplifiers, preamplifiers, and distributed amplifiers. To date, nearly all the fiber used in these devices has been silica based and fabricated by variations on the major telecommunications fiber technology. Disadvantages of the silica-based host glass, such as low solubility of the rare-earth ions and narrowband fluorescence, have been carefully addressed and solutions have been found to overcome these potential drawbacks. Details of the current status of fabrication methods, matching particular fibers for specific applications, together with optimizing the fiber for high efficiency, are presented. >
241 citations
CNET1
TL;DR: In this article, it was shown that in low-concentration erbium-doped silicate fibers (below 1000 p.p.m.), a residual absorption at 980 nm cannot be saturated.
Abstract: It is shown that in low-concentration erbium-doped silicate fibers (below 1000 p.p.m.), a residual absorption at 980 nm cannot be saturated. Usual models for upconversion of Er/sup 3+/ cannot match this behavior nor explain a fluorescence lifetime independent of pump power and erbium concentration. A phenomenon, the pair induced quenching (PIQ), that is compatible with the previous experimental results is exhibited. The influence of erbium and aluminum concentration on the ion pair proportion is shown. >
240 citations
TL;DR: In this article, the state-of-the-art in terms of fabrication tools used for producing waveguide lasers is reviewed from the aspects of the processes and the materials involved.
191 citations
TL;DR: It is shown that the host glass influences the excited-state absorption spectra and that P(2)O(5)- or A1(2]O(3)-codoped fibers are the preferred choice for 514.5-, 655-, or 807-nm pump wavelengths owing to reduced pump excited- state absorption.
Abstract: Ground-state and excited-state absorption spectra covering the wavelength range of 450–1050 nm are presented for erbium-doped silica fibers with four different core codopants: GeO2, GeO2/B2O3, GeO2/P2O5, and Al2O3. It is shown that the host glass influences the excited-state absorption spectra and that P2O5- or Al2O3-codoped fibers are the preferred choice for 514.5-, 655-, or 807-nm pump wavelengths owing to reduced pump excited-state absorption. However, excited-state absorption is still significant at the 807-nm wavelength. Pump wavelengths of 524, 532, and 980 nm appear ideal because of the strong ground-state absorption and lack of excited-state absorption.
146 citations