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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 14, Iss. 7 — Jul. 1, 1997
  • pp: 1838–1845

Cooperative upconversion effects on the performance of Er3+-doped phosphate glass waveguide amplifiers

T. Ohtsuki, S. Honkanen, S. I. Najafi, and N. Peyghambarian  »View Author Affiliations


JOSA B, Vol. 14, Issue 7, pp. 1838-1845 (1997)
http://dx.doi.org/10.1364/JOSAB.14.001838


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Abstract

The cooperative upconversion processes of erbium ions in silver film ion-exchanged waveguides in a phosphate glass were studied from the pump intensity dependence of luminescence decay curves. Cooperative upconversion coefficients of the  4I13/2 level, 7.7±0.7×10-19 and 9.3±0.7×10-19cm3/s, were obtained for an Er3+ concentration of 1×1020cm-3 in bulk and waveguide samples, respectively. These values are 1 order of magnitude smaller than the ones reported for silica glass. The increase in the cooperative upconversion coefficient with the increase in Er3+ concentration was found to be small. The effects of cooperative upconversion on the gain performance were analyzed for different Er3+ concentrations by a theoretical model based on experimentally measured gain with a 1.48-µm pump wavelength. Given the small cooperative upconversion coefficients in this glass, Er3+ concentrations potentially as high as 3.7×1020cm-3 were shown to be feasible. Such high concentrations would result in a 12-dB gain at 150-mW pump power with a 4-cm-long waveguide.

© 1997 Optical Society of America

Citation
T. Ohtsuki, S. Honkanen, S. I. Najafi, and N. Peyghambarian, "Cooperative upconversion effects on the performance of Er3+-doped phosphate glass waveguide amplifiers," J. Opt. Soc. Am. B 14, 1838-1845 (1997)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-14-7-1838

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