Characteristics of potassium-ion-exchanged channel waveguide amplifiers fabricated in acommercial phosphate glass with 1.65 wt% Er{sub}2O{sub}3 and 22 wt% Yb{sub}2O{sub}3 are reported. Theoretical investigations reveal that at 1.530-μm signal wavelength, 4.2 dB/cm can be achieved in potassium-ion-exchanged waveguides when 120-mW pump power at 974-nm wavelength is used. Theoretical studies predict 42% slope efficiency with 42.5-mW threshold pump power in a 1.0-cm-long potassiumion-exchanged waveguide lasers in this glass.
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