Fibre optic communication subsystem test procedures
Part 4-3: Installed passive optical networks – Attenuation and optical return loss measurements
(IEC 61280-4-3:2022); German version EN IEC 61280-4-3:2022 Class/Status:
Standard,
valid
Released: 2024-02
VDE Art. No.: 0800930
This part of IEC 61280-4 describes the measurement of attenuation, optical return loss and optical power in installed passive optical networks (PON) using single-mode fibre. This document specifies two methods for measuring the attenuation: - Method A: One-cord method using a light source and a power meter (LSPM); - Method B: Optical time-domain reflectometer (OTDR) method in upstream direction only, with reduction of uncertainties due to the variation of backscatter coefficient. In addition, informative Annex C provides an estimate of the attenuation when using a U band filtered optical time-domain reflectometer (FOTDR) in an upstream direction, after partial activation of the PON.
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