The amplification of telecommunication signals near 1.5μ m has been successfully demonstrated with Er

3+

doped silica fiber.However

silica fiber is unsuitable as component in short length devices because the highest possible Er

3+

ion concentration in silica fiber is very low around 100ppm.There are several candidates for matrix glasses that homogeneously contain rare earth ions.Phosphate glass is one of these candi-dates.In this paper

we reported a kind of Er

3+

doped phosphate glass which can be used as transmission and amplification medium in 1.5μm optical communication.The phosphate glass is composed of(mol%) P

2

O

5

(60)-Na

2

CO

3

(24)-Al

2

O

3

-Er

2

O

3

(0.5)-Yb

2

O

3

(2.0).Firstly

We precisely measured 10-gram strating materials as showed proportion

then put them into a electric-resistance furnace with temperature of 200℃ for two hours.After those unwanted vapor and gases were got rid of

we transported them into a silica-molybdenum-rod furnace with 1 200℃.When the batch was melted enough about a half hour

we quickly poured the melted liquid into a cube-shaped mould with 480℃ temperature

then put mould into electric-resistance furnace with 480℃ for anneal.The resulting glass cube was cut and polished for spectra experiments.We have measured the absorption spectrum of the galss with PERK IN-ELMER Lambda 9 spectrometer and observed eight absorption bands.Among the eight absorption bands

the absorption band near 970nm was the strongest.Th emission spectrum under 970nm LD excitation has also been acquired.In this spectrum

only a strong emission near 1540nm wavelength can be observed.We have obtained the Judd-Ofelt parameters by fitting the absorption spectrum and got the resutls as follows.Ω

2

=4.29×10

-20

(cm

2

);Ω

4

=1.01×10

-20

(cm

2

);Ω

6

=0.75×10

-20

(cm

2

).The spontaneous emission probabilities of the relevant transition have been calculated with the obstained Judd-Ofelt parameters

so we have a theoretic guide for researching the luminescence phenomenon in the phosphate glass.Lastly

we calculated the absorption and emission cross-section near 1.5μm by Fuchtbaure-Ladenburg theory

from the results we know that the glass has a big emission cross-section near 1.5μm emission.