Properties of dysprosium-doped gallium lanthanum sulfide fiber amplifiers operating at 1.3 µm

B. N. Samson; T. Schweizer; D. W. Hewak; R. I. Laming

doi:10.1364/OL.22.000703

Optics Letters
Vol. 22,
Issue 10,
pp. 703-705
(1997)
•https://doi.org/10.1364/OL.22.000703

Properties of dysprosium-doped gallium lanthanum sulfide fiber amplifiers operating at 1.3 µm

B. N. Samson, T. Schweizer, D. W. Hewak, and R. I. Laming

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B. N. Samson, T. Schweizer, D. W. Hewak, and R. I. Laming, "Properties of dysprosium-doped gallium lanthanum sulfide fiber amplifiers operating at 1.3 µm," Opt. Lett. 22, 703-705 (1997)

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Abstract

In light of recent progress in the fabrication of gallium lanthanum sulfide (GaLaS) fibers, we have modeled the performance of dysprosium-doped GaLaS fiber amplifiers operating at $1.3 µ m$ . Based on experimental data, we find that the incorporation of a codopant (terbium) in the fiber core significantly shortens the optimum amplifier length from $> 30 m$ to $\sim 3 m$ . Such a device may be practical, given the fiber losses currently achieved in GaLaS fibers.

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Energy Level	Wavelength (nm)	500-ppm ${Dy}^{3 +}$ -Doped Sample $(μ s)$	500-ppm ${Dy}^{3 +}$ –4000-ppm ${Tb}^{3 +}$ -Codoped Sample $(μ s)$
4	1320	55	37
3	1800	1300	200
2	2800	3600	520

Parameter	Value	Comments
$σ_{14}^{p}$	$1.0 \times 10^{- 24} m^{2}$	Pump absorption cross section
$σ_{- 41}^{p}$	$0.1 \times 10^{- 24} m^{2}$	Pump emission cross section
$σ_{- 14}^{s}$	$1.7 \times 10^{- 24} m^{2}$	Signal absorption cross section
$σ_{41}^{s}$	$2.8 \times 10^{- 24} m^{2}$	Signal emission cross section
$τ_{4}$	$55 µ s$	Measured lifetime
$A_{41}$	$1800 s^{- 1}$	Radiative decay rate
$A_{42}$	$455 s^{- 1}$	Radiative decay rate
${MP}_{43}$	$14, 930 s^{- 1}$	Multiphonon decay rate
$τ_{3}$	$1300 µ s$	Measured lifetime
$A_{31}$	$338 s^{- 1}$	Radiative decay rate
$A_{32}$	$55 s^{- 1}$	Radiative decay rate
${MP}_{32}$	$380 s^{- 1}$	Multiphonon decay rate
$τ_{2}$	$3600 µ s$	Measured lifetime

Energy Level	Wavelength (nm)	500-ppm ${Dy}^{3 +}$ -Doped Sample $(μ s)$	500-ppm ${Dy}^{3 +}$ –4000-ppm ${Tb}^{3 +}$ -Codoped Sample $(μ s)$
4	1320	55	37
3	1800	1300	200
2	2800	3600	520

Parameter	Value	Comments
$σ_{14}^{p}$	$1.0 \times 10^{- 24} m^{2}$	Pump absorption cross section
$σ_{- 41}^{p}$	$0.1 \times 10^{- 24} m^{2}$	Pump emission cross section
$σ_{- 14}^{s}$	$1.7 \times 10^{- 24} m^{2}$	Signal absorption cross section
$σ_{41}^{s}$	$2.8 \times 10^{- 24} m^{2}$	Signal emission cross section
$τ_{4}$	$55 µ s$	Measured lifetime
$A_{41}$	$1800 s^{- 1}$	Radiative decay rate
$A_{42}$	$455 s^{- 1}$	Radiative decay rate
${MP}_{43}$	$14, 930 s^{- 1}$	Multiphonon decay rate
$τ_{3}$	$1300 µ s$	Measured lifetime
$A_{31}$	$338 s^{- 1}$	Radiative decay rate
$A_{32}$	$55 s^{- 1}$	Radiative decay rate
${MP}_{32}$	$380 s^{- 1}$	Multiphonon decay rate
$τ_{2}$	$3600 µ s$	Measured lifetime

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