A novel technique for measuring the pump induced change in refractive index in erbium-doped optical fibre is reported. A saturated peak-to-trough change in index of 6.7 × 10-8 /(dB/m) of absorption was measured and the technique was verified by showing excellent agreement with a Kramers-Kronig transform of the measured change in absorption.
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Janos et al. (1997) studied this question.
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