[1] G. N. van den Hoven, R. J. I. M. Koper, A. Polman et al.. Net optical gain at 1.53 μm in Er-doped Al2O3 waveguides on silicon[J]. Appl. Phys. Lett., 1996, 68(14): 1886～1888
[2] L. H. Slooff, A. van Blaaderen, A. Polman et al.. Rare-earth doped polymers for planar optical amplifiers[J]. J. Appl. Phys., 2002, 91(7): 3955～3980
[3] A. J. Kenyon. Recent developments in rare-earth doped materials for optoelectronics[J]. Progress in Quant. Electron., 2002, 26(4～5): 225～284
[6] Fabrizio D. Pasquale, Marco Federighi. Modeling of uniform and pair-induced upconversion mechanisms in high-concentration erbium-doped silica waveguides[J]. Lightwave Technol., 1995, 13(9): 1858～1864
[7] G. N. van den Hoven, E. Snoeks, A. Polman et al.. Upconversion in Er-implanted Al2O3 wave-guides[J]. J. Appl. Phys., 1996, 79(3): 1258～1265
[8] A. Shooshtrai, T. Touam, S. I. Najafi et al.. Yb3+ sensitized Er3+-doped waveguide amplifiers: a theoretical approach[J]. Opt. and Quant. Electron., 1998, 30(3): 249～264
[9] C. Strohhfer, A.Polman. Silver as a sensitizer for erbium[J]. Appl. Phys. Lett., 2002, 81(8): 1414～1416
[10] Se Young Seo, Jung H. Shin, B. S. Bae et al.. Erbium-thulium interaction in broadband infrared luminescent silicon-rich silicon oxide[J]. Appl. Phys. Lett., 2003, 82(20): 3445～3447
[14] Christof Strohhofer, Albert Polman. Absorption and emission spectroscopy in Er3+-Yb3+ doped aluminum oxide waveguides[J]. Optical Material, 2003, 21(4): 705～712
[15] Qi Song, Cheng-Ren Li, Jian-Yong Li et al.. Photoluminescence properties of the Yb∶Er co-doped Al2O3 thin film fabricated by microwave ECR plasma source enhanced RF magnetron sputtering[J]. Optical Materials, 2006, 28(12): 1344～1349
[17] Li Chengren, Song Changlie, Li Shufeng et al.. Deposition of Er∶Al2O3 films and photo-luminescence characteristics[J]. Chin. Phy. Lett., 2003, 20(9): 1613～1615
[19] Qi Song, Chang-Lie Song, Cheng-Ren Li et al.. Design for non-uniformly doped erbium-doped waveguide amplifiers in the propagation direction[J]. Opt. Commun., 2005, 248(1): 1～6
[20] Qi Song, Chengren Li, Shufeng Li et al.. Optical property of non-uniform Er doped and Yb∶Er co-doped waveguide amplifiers[C]. Proc. SPIE, 2005, 6019: 676～684
