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4.1.5 Positive Gain Phenomenon Processing
Positive gain may occur on the OTDR curve, as shown in the right
figure. Positive gain is due to more backward astigmatism produced by
the fibers after the fusion point than those before the fusion point. In
fact, the optical fibers have a loss at this fusion point. It often occurs in
the fusion process of optical fibers with different mode field diameters
or backscattering coefficients. Therefore, it is necessary to measure the
fusion loss in two directions and take the average of the results as the
fusion loss.
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