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DIN EN IEC 60793-1-41 VDE 0888-241:2025-06

Optical fibres

Part 1-41: Measurement methods and test procedures – Bandwidth

(IEC 60793-1-41:2024); German version EN IEC 60793-1-41:2024
Class/Status: Standard, valid
Released: 2025-06
VDE Art. No.: 0801038

Note: You can pre-order this document (delivery subject to availability). Valid from 2025-06-01.

This part of IEC 60793 describes three methods for determining and measuring the modal bandwidth of multimode optical fibres (see IEC 60793-2-10, IEC 60793-30 and IEC 60793-40 series). The baseband frequency response is directly measured in the frequency domain by determining the fibre response to a sinusoidaly modulated light source. The baseband response can also be measured by observing the broadening of a narrow pulse of light. The calculated response is determined using differential mode delay (DMD) data. The three methods are:
Method A – Time domain (pulse distortion) measurement;
Method B – Frequency-domain measurement;
Method C – Overfilled launch modal bandwidth calculated from differential mode delay (OMBc).
Methods A and B can be performed using one of two launches: an overfilled launch (OFL) condition or a restricted mode launch (RML) condition. Method C is only defined for A1a.2 (and A1a.3 in preparation) multimode fibre and uses a weighted summation of DMD launch responses with the weights corresponding to an overfilled launch condition. The relevant test method and launch condition should be chosen according to the type of fibre.