Measurement method for optical fiber transmission loss: These methods include cut-back method, insertion loss method, and backscattering method. A. Cut-back method This method is the standard measurement regulated by ITU-T, which directly follows the definition of the optical fiber transmission loss coefficient. Under the same input conditions, the output light power of a long fiber is measured and compared with the same measurement of a same fiber of around 2 meters. The transmission loss coefficient α (l) is then calculated according to formula (4-1). This method has the highest precision but is also a ‘destructive’ method.
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