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The broad spectrum of radiation from first-order stimulated Raman scattering in glass fibres leads to a spread of transverse Stokes fields in a single-mode fibre. A general expression for the effective core area (ECA) for the laser-pump ith longitudinal Stokes-mode interaction has been found. Computations of the variation of ECA with V-value are presented, together with a single ECA for use when computing the total Stokes power.
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Urquhart et al. (1985) studied this question.
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