A novel nondestructive technique for characterising couplers by means of a local perturbation is described. The method is studied theoretically and verified experimentally by characterising different types of fused fiber-couplers. Using this technique, both the information of the power distribution and coupling profile along the coupler waist are obtained.


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  1. M. K. Davis, M. J. F. Digonnet and R. H. Pantell, "Thermal effects in doped fibers", J. Lightwave Technol., vol. 16, pp. 1013-1023, June 1998 .

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