K. Hattori et al., OPTICAL AND STRUCTURAL-PROPERTIES OF ER3-DOPED P2O5-SIO2 AND AL(2)0(3)-SIO2 PLANAR WAVE-GUIDES(), Materials science & engineering. B, Solid-state materials for advanced technology, 54(1-2), 1998, pp. 15-17
Er3+-doped P2O5-SiO2 planar waveguides, fabricated by flame hydrolysis
deposition, are shown to have a higher gain than Er3+-doped Al2O3-SiO
2 planar waveguides, fabricated by plasma enhanced chemical vapor depo
sition. An optical absorption measurement reveals that the high gain o
f Er3+-doped P2O5-SiO2 waveguides is due to a high population inversio
n. These optical properties are related to the homogeneity of the wave
guide-core glasses which were analyzed with a scanning electron micros
cope. (C) 1998 Elsevier Science S.A. All rights reserved.