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The development of silicon compatible optoelectronics would require th
e fabrication and integration of several optical functions such as wav
eguides, amplifiers, signal processing components and light emitters i
n silicon or on thin films deposited on silicon, In this paper the opt
ical doping by erbium ion implantation of sodalime silica glass and si
licon is presented with the aim to fabricate an amplifier and a light
source operating at 1.5 mu m. The materials issues currently limiting
the performances of these devices are analyzed in detail and the possi
ble future developments are discussed.