Reflectance accuracy of an Optical Time Domain Reflectometer (OTDR) refers to the precision with which the device can measure the level of reflectance at events such as splices, connectors, and other discontinuities in a fiber optic network.

Reflectance, also known as return loss or reflectivity, is the ratio of reflected light to incident light at an optical interface. It indicates the amount of light that is reflected back towards the source when light encounters a change in the optical medium, such as a connector or splice.

Reflectance accuracy is crucial in fiber optic testing because it helps in assessing the quality of optical connections and identifying potential issues such as dirty or damaged connectors, poorly aligned splices, or other irregularities that can cause signal loss or degradation.

Reflectance accuracy is expressed in terms of a percentage or in decibels (dB).

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