Calculation method and coefficient values of the GeO₂ dopant diffusion from the core to the cladding of spliced fibres in splicing temperature have been presented. Accepting different diffusion models, the intermediate area dimensions for various splicing parameters were calculated. A correlation between intermediate area parameters and splice loss of single mode fibres of different types including those designed for WDM has been discovered. The analysis and usage of one-way OTDR measurement of splice losses of fibres with essential differences in cores diameters and numerical aperture has been presented. There also has been presented the influence of these parameters on one-way OTDR measurement of loss of splices of joined fibres.
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