Non-destructive method measurment data are labelled in XXm_Xs_X format.

8m and 25m represent the fiber lengths of 8.4m and 25.2 m.

Xs is the integration time of spectrometer x seconds.

X is the Xth measurement under independent butt-coupling optimization. 

All data files have two columns: the first column is the wavelength in unit of nm; the second is the measured intensity in unit of count.

All data can be imported to the uploaded MATLAB program to filter the background and use to calculate the attenuation of fiber.