This International Standard provides procedures for calibrating single-mode optical time domain reflectometers (OTDR). It only covers OTDR measurement errors and uncertainties.
This standard does not cover correction of the OTDR response.
In order for an OTDR to qualify as a candidate for complete calibration using this standard, it must be equipped with the following minimum feature set:
a) a programmable index of refraction, or equivalent parameter;
b) the ability to present a display of a trace representation, with a logarithmic power scale and a linear distance scale;
c) two markers/cursors, which display the loss and distance between any two points on a trace display;
d) the ability to measure absolute distance (location) from the OTDR's zero-distance reference;
e) the ability to measure the displayed power level relative to a reference level (for example, the clipping level).
f) the ability to evaluate the reflectance of a reflective event.
BS EN 61746:2005 history
2011BS EN 61746-1:2011 Calibration of optical time-domain reflectometers (OTDR). OTDR for single-mode fibres
2005BS EN 61746:2005 Calibration of optical time-domain reflectometers (OTDR)
2001BS EN 61746:2001 Calibration of optical time-domain reflectometers (OTDRs)