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A 20 dB gain is observed at 1.55 μm in a 50 cm long fluoride fibre containing 5000 ppm Er3+-ion in a core. A launched pump power of 57 mW was obtained using a 1.48 μm laser diode. Gain difference in the 1535–1563 nm wavelength region is less than 1 dB.
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Miyajima et al. (1990) studied this question.
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