A new definition of the mode-field radius (MFR) of a noncircular field single-mode fibre (NCSMF) is proposed, based on the quadratic moment of far-field distribution. Relations between MFR and splice loss, propagation constant and waveguide dispersion of the NCSMF are derived, which will reduce to known results under cases of circular and Gaussian-elliptic field distribution.
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Liang et al. (1988) studied this question.
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