Optical properties of fibres with aluminophosphosilicate glass cores

Bubnov, M M; Gur'yanov, A N; Zotov, K. V.; Исхакова, Л. Д.; Lavrishchev, S. V.; Lipatov, Denis S.; Likhachev, Mikhail E.; Rybaltovsky, A A; Khopin, V. F.; Yashkov, Mikhail V.; Dianov, Evgenii M

doi:10.1070/qe2009v039n09abeh014007

Cited by 34 publications

(25 citation statements)

References 2 publications

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“…For the fiber B1550, which has a lower excess of P concentration with respect to Al (P-Al = 1 at.%), we observed a decrease in the refractive index compared to the fiber A1550 having P-Al = 2 at.%. This is due to there being a better compensation of the refractive index change arising from the Al by the P, consistent with Bubnov's study on the influence of Al and P on the optical properties of silica fibers [46].…”

Section: Discussionsupporting

confidence: 88%

“…Similar effects have been also observed in [59,60], where an additional loss component that extends from the visible to the near infrared region was observed for the compositions that contain excess in P concentration with respect to Al, and it disappears as Al exceeds P concentration. Bubnov in [45,46] suggests that this increase in the losses is not due to the intrinsic properties of the P 2 O 5 -Al 2 O 3 -SiO 2 system containing excess in P, but its due to Fe impurities. In silica glass, Fe can be present in the form of Fe 3+ and Fe 2+ .…”

Section: Discussionmentioning

confidence: 99%

“…The refractive index profile is one of the essential guiding parameters to determine various properties of optical fiber, such as the numerical aperture (NA) and the single mode cutoff. Bubnov [45], studied the effect of Al and P concentrations on the refractive index in silica glass showing that, individually, each co-dopant would increase the refractive index, but, in combination, the P compensates for the refractive index change arising from the Al [46].…”

Section: Refractive Index Profilesmentioning

confidence: 99%

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Fabrication and Characteristics of Yb-Doped Silica Fibers Produced by the Sol-Gel Based Granulated Silica Method

Sayed

Pilz

Najafi

et al. 2018

Fibers

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Combining the sol-gel method for fiber material production with the granulated silica method for preform assembly results in a robust method that offers a high degree of freedom regarding both the composition and the geometry of the produced fiber. Using this method, two types of Yb-doped silica glass composition, that feature an excess in P concentration with respect to Al, have been prepared. The elemental distributions in a fiber core were analyzed by scanning transmission electron microscopy (STEM). The elemental mapping shows a similar localization of Al, P and Yb through the microstructure. In addition, the influence of the variation in the co-dopant concentration, with respect to Yb, on the fiber properties has been investigated. The results show an increase in the refractive index step and in the fiber’s transmission loss as the excess concentration of P increases. A significant contribution to the losses can be assigned to the existence of impurities such as iron, which was detected in our samples by mass spectrometer. Single exponential fluorescence decays with lifetimes of around 0.88 ms were measured for the two compositions. Finally, pumping at 976 nm a laser slope efficiency of 67% at 1031 nm was achieved for one of the fiber compositions.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Refractive Index Profilesmentioning

confidence: 99%

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Fabrication and Characteristics of Yb-Doped Silica Fibers Produced by the Sol-Gel Based Granulated Silica Method

Sayed

Pilz

Najafi

et al. 2018

Fibers

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“…On the other hand, for P 2 O 5 free fibers as well as for Al 2 O 3 ‐rich APS fibers no absorption at 1200 nm was observed as in this case iron is incorporated in the glass matrix at the valence state of 3+. This Fe 3+ ions contribute excess loss at wavelengths below 400 nm and the loss was observed to be minimum for P 2 O 5 free fibers .…”

Section: Fabrication Of Optical Fibersmentioning

confidence: 87%

Vapor phase doping process for fabrication of rare earth doped optical fibers: Current status and future opportunities

Saha

Sen

2016

Physica Status Solidi (a)

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Emerging application of rare-earth (RE) doped optical fibers in high power lasers requires preforms with stringent geometrical and optical properties. This in turn demands more versatile and reliable process technology which brought Vapor Phase Doping (VPD) into prominence. This technology has immense potential to overcome fiber fabrication related challenges viz, dopant-rich phase separation, RE uniformity in radial as well as longitudinal direction, "star-like" defect elimination from core-clad boundary and refractive index (RI) adjustment which results in improved beam quality and power stability of fiber laser. Further, high power lasers demand LMA active fibers with large core diameter and low numerical aperture (NA) which is easily producible by VPD method as it permits deposition of multiple RE doped core layers in a reproducible "in situ" manner. So, the prime focus is to optimize process technology to produce low RI, large core fibers. This article gives an overview of the comprehensive effort made by the global researchers to overcome challenges of VPD method and to demonstrate a standardized process technology for RE doping in silica glass preform.

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“…The glass matrix concentration of the above input precursor materials were in the molar percentage ratio SiO 2 : Al(NO 3 ) 3 .9H 2 O : TMP : YbCl 3 .6H 2 O = 94.7: 3.0:2.0:0.3 which result in a P to Al ratio of 0.6 for raising the refractive index profile change of the fiber core as well as suppressing clustering. [14]. In addition to its active ion contribution, ytterbium also raises the core's index for the guiding of light.…”

Section: Production Of Doped Granulated Core Materials By the Sol-gel mentioning

confidence: 98%

Rare earth doped optical fiber fabrication by standard and sol-gel derived granulated oxides

Etissa¹,

Neff²,

Pilz³

et al. 2012

SPIE Proceedings

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We present our progress in the production of ytterbium (Yb) doped optical fibers fabricated by two variants of the granulated aluminophosphosilicate method. We show advantages and disadvantages of mixing rare earth and aluminophosphosilicate granulated oxides directly (variant 1) or by using the sol-gel method to produce doped granulate material (variant 2). For both methods we studied the effects of varying the dopant concentrations and of introducing iterative melting and milling procedures. In particular, the sol-gel based method eases the inclusion of P 2 O 5 and thus, in combination with Al 2 O 3 , higher dopant concentration of Yb and Er are possible. Sintering the sol-gel material at high temperature eliminated bubbles in the core. We fabricated optical fibers that, piecewise, between individual strong scatterers, exhibited attenuation losses as low as 0.35dB/m. For our comparative study we determined volume percentage and distribution of chemical elements in the fabricated fiber glasses by the analytical technique of Energy-Dispersive X-ray, Electro Probe Microanalysis and the degree of crystallization by X-Ray Diffraction analysis. Furthermore we measured fluctuations of the refractive index profile and scattering losses of the fiber core.

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Optical properties of fibres with aluminophosphosilicate glass cores

Cited by 34 publications

References 2 publications

Fabrication and Characteristics of Yb-Doped Silica Fibers Produced by the Sol-Gel Based Granulated Silica Method

Fabrication and Characteristics of Yb-Doped Silica Fibers Produced by the Sol-Gel Based Granulated Silica Method

Vapor phase doping process for fabrication of rare earth doped optical fibers: Current status and future opportunities

Rare earth doped optical fiber fabrication by standard and sol-gel derived granulated oxides

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