Dy

3+

-doped fluorozirconate(ZBLAN)glasses were prepared

and the absorption and emission spectrum of Dy

3+

ions in ZBLAN glasses were measured.Using Judd-Ofelt theory

parameters of Dy

3+

ions in fluorozirconate glasses according to the absorption spectrum and the emission cross of

6

F

11/2

-(

6

H

9/2

)→

6

H

15/2

tranbsition of 1.3μm emission were calculated Ω

2

=3.29×10

20

cm

2

Ω

4

=1.56×10

20

cm

2

Ω

6

=2.48×10

20

cm

2

;and σ

e

=0.62×10

-20

cm

-1

.The calculated results showed that ZBLAB glass is a good host for Dy

3+

ion doped

and higher emission cross of Dy

3+

than Pr

3+

:ZBLAB give a good promising for Dy

3+

as the doped ion in 1-3μm fiber amplifier.The effect of the Dy

3+

concentration on the emissiion intensities has been discussed

emission intensities of Dy

3+

ions become stronger with incresaing the doping concentration.Concentration quenching will occur when concentration of Dy

3+

exceeds 1.5mol%.