Townsend, J.E., Barnes, W.L. and Grubb, S.G.
Yb3+ sensitised Er3+ doped, silica-based optical fibre with ultra-high transfer efficiency
Broer, M.J., Sigel, G.H., Kersten, R.T. and Kawazoe, H. (eds.)
Optical Waveguide Materials.
Materials Research Society
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Efficient 1.54µm emission under 1064nn excitation of Er3+ codoped silica fibre is reported. The energy transfer efficiency from Yb3+ to Er3+, of at least 85%, even under high inversion, is comparable to that in multicomponent glass fibres. Fibre design parameters are discussed and results presented. Small signal gain of ~45 dB is also measured and a power amplifier giving 145mW output power demonstrated.
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