Investigation of the spectral advantages of sol-gel layered erbium doped waveguide amplifiers

High levels of net gain have recently been reported in sol-gel phosphorous-aluminium co-doped silica waveguides. However, compositions providing both high net gain and large spectral width have not yet been achieved. In this paper we propose the use of laminated cores of multiple compositions to achieve improved spectral performance in erbium-doped waveguide amplifiers. We demonstrate the potential advantages of this technique by simulations of cores laminated from previously demonstrated individual glasses.