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Singlemode high erbium-doped phosphate glass fibres have been designed and fabricated. Gain measurements in a 2.15 cm fibre with an Er3+ concentration of 3.7 × 1020 cm–3 were performed. A net gain of 2.1 dB/cm at 1537 nm was demonstrated with a pump diode power of 110 mW at 980 nm.
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Hwang et al. (1999) studied this question.
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