Optimizing Yb concentration of fiber amplifiers in the presence of transverse modal instabilities and photodarkening

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Abstract

The Yb concentration of double-clad optical fiber amplifiers is numerically optimized with respect to maximizing the transverse modal instability threshold in the presence of absorption arising from photodarkening. The pump cladding area is scaled with the Yb concentration to approximately maintain the pump absorption in operation. It is found that approximate analytical expressions can predict the optimized concentration levels found in numerical simulations with sufficient accuracy to be useful in fiber design. (C) 2016 Optical Society of America
Original languageEnglish
JournalApplied Optics
Volume55
Issue number8
Pages (from-to)1966-1970
ISSN1559-128X
DOIs
Publication statusPublished - 2016

Bibliographical note

© 2016 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.

Keywords

  • OPTICS
  • GAIN SATURATION
  • DOPED SILICA
  • POWER
  • THRESHOLD
  • DEPENDENCE

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