A new model for the calculation of the Mode Field Diameter of Single-Mode fibres from OTDR measurements is presented. The model gives a high accuracy (s=0.002 μm) and good information about MFD uniformity along the fibre. The model is insensitive for MFD variations of the reference fibre near the coupling to the fibre under test. The OTDR is becoming one of the most important measurement devices for qualifying Single-Mode fibres. Especially when the OTDR is used in combination with an optical switch, two reference fibres and two coupling devices as indicated in figure 1.
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