A lanthanum codoped erbium fibre amplifier (La–Er/GeO2/SiO2) has been investigated by comparing such an amplifier with Al–Er/GeO2/SiO2 and Er/GeO2/SiO2 EDFAs. A gain of more than 35 dB at a wavelength of 1.535 μm was obtained for 1.48 μm pump power of 35mW, which was the highest gain among them. The gain spectral profile was moderately flattened at around 1.552 μm and the gain peaks at 1.535 and 1.552 μm shifted 0.5–1 nm toward the shorter wavelength region.
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Nakazawa et al. (1991) studied this question.