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An efficient method has been presented for evaluating the splice losses between two identical arbitrarily gradedindex single-mode fibers caused by transverse and angular misalignments. The power transmission coefficients at the splice are expressed as weighted sum of simple Laguerre-Gaussian functions, the weight factors being computed by solving a linear matrix eigenvalue problem. The usual numerical evaluation of the overlap integrals is thus avoided. The method can be used as a reference method to test the accuracies of other approximate splice foss models.

In this paper we present highly accurate and simple methods for the evaluation of splice loss in single-mode graded-index fibers. These are based on accurate approximations of the modal field of such fibers which we have recently developed. Splice losses for angular and transverse offsets have been expressed in analytical forms which are quite easy to evaluate. A comparison of our results with those obtained using the Gaussian approximation is also presented which shows that our method is much more accurate than the latter.

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