Er/sup 3+/-Yb/sup 3+/ codoped phosphate glass waveguide amplifier using Ag/sup +/-Li/sup +/ ion exchange

An Er/sup 3+/-Yb/sup 3+/ codoped phosphate glass waveguide amplifier using an Ag/sup +/-Li/sup +/ ion exchange process is demonstrated. The glass contains Li/sup +/ instead of Na/sup +/ and the spectroscopic properties were characterized. The emission parameters were calculated, and the radiative quantum efficiency of the 4I/sub 13/2/ to 4I/sub 15/2/ transition is estimated to be /spl sim/100 %. T...