IEC 60793-1-41:2010

Optical fibres - Part 1-41: Measurement methods and test procedures - Bandwidth

IEC 60793-1-41:2010 describes three methods for determining and measuring the modal bandwidth of multimode optical fibres (see IEC 60793-2-10, IEC 60793-30 series 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).
The main change with respect to the previous edition is the addition of a third method for determining modal bandwidth based on DMD data and to improve measurement procedures for A4 fibres. This standard should be read in conjunction with IEC 60793-1-1 and IEC 60793-1-2, which cover generic specifications.

Fibres optiques - Partie 1-41: Méthodes de mesure et procédures d'essai - Largeur de bande

La CEI 60793-1-41:2010 décrit trois méthodes pour déterminer et mesurer la largeur de bande modale des fibres optiques multimodales (voir CEI 60793-2-10, série CEI 60793-30 et série CEI 60793-40). La réponse en fréquence de bande de base est directement mesurée dans le domaine fréquentiel en déterminant la réponse de la fibre à une source lumineuse modulée de manière sinusoïdale. La réponse en bande de base peut aussi être mesurée en observant l'élargissement d'une impulsion étroite de lumière. La réponse calculée est déterminée en utilisant les données de retard de mode différentiel (differential mode delay - DMD). Les trois méthodes sont les suivantes:
- Methode A - Mesure dans le domaine temporel (distorsion d'impulsion)
- Methode B - Mesure dans le domaine fréquentiel
- Methode C - Largeur de bande modale d'injection saturée calculée à partir du retard de mode différentiel (OMBc).
La modification principale par rapport à la précédente édition est l'addition d'une troisième méthode pour la détermination de la largeur de bande modale fondée sur les données de DMD et afin d'améliorer les procédures de mesure pour les fibres A4. Il convient d'utiliser cette norme conjointement à la CEI 60793-1-1 et à la CEI 60793-1-2, qui couvrent les spécifications génériques.

General Information

• Status: Published
• Publication Date: 30-Aug-2010
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 31.200 - Integrated circuits. Microelectronics
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: SC 86A - Fibres and cables
• Drafting Committee: WG 1 - TC 86/SC 86A/WG 1

Relations

• Revised: IEC 60793-1-41:2024 - Optical fibres - Part 1-41: Measurement methods and test procedures - Bandwidth
• Effective Date: 05-Sep-2023
• Revises: IEC 60793-1-41:2003 - Optical fibres - Part 1-41: Measurement methods and test procedures - Bandwidth
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60793-1-41 ®
Edition 3.0 2010-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibres –
Part 1-41: Measurement methods and test procedures – Bandwidth

Fibres optiques –
Partie 1-41: Méthodes de mesure et procédures d'essai – Largeur de bande

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IEC 60793-1-41 ®
Edition 3.0 2010-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Optical fibres –
Part 1-41: Measurement methods and test procedures – Bandwidth

Fibres optiques –
Partie 1-41: Méthodes de mesure et procédures d'essai – Largeur de bande

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
U
CODE PRIX
ICS 33.180.10 ISBN 978-2-88912-170-0
– 2 – 60793-1-41 © IEC:2010
CONTENTS
FOREWORD.4
1 Scope.6
2 Normative references .6
3 Terms and definitions .7
4 Apparatus.7
4.1 Radiation source .7
4.1.1 Method A – Time domain (pulse distortion) measurement.7
4.1.2 Method B – Frequency domain measurement .8
4.1.3 Method C – Overfilled launch modal bandwidth calculated from
differential mode delay (OMBc) .8
4.1.4 For methods A and B.8
4.2 Launch system .8
4.2.1 Overfilled launch (OFL) .8
4.2.2 Restricted mode launch (RML) .9
4.2.3 Differential mode delay (DMD) launch .10
4.3 Detection system.10
4.4 Recording system.10
4.5 Computational equipment.11
4.6 Overall system performance .11
5 Sampling and specimens.11
5.1 Test sample .11
5.2 Reference sample .11
5.3 End face preparation .11
5.4 Test sample packaging.12
5.5 Test sample positioning.12
6 Procedure .12
6.1 Method A – Time domain (pulse distortion) measurement.12
6.1.1 Output pulse measurement.12
6.1.2 Input pulse measurement method A-1: reference sample from test
sample .12
6.1.3 Input pulse measurement method A-2: periodic reference sample .12
6.2 Method B – Frequency domain measurement .13
6.2.1 Output frequency response.13
6.2.2 Method B-1: Reference length from test specimen.13
6.2.3 Method B-2: Reference length from similar fibre .13
6.3 Method C – Overfilled launch modal bandwidth calculated from differential
mode delay (OMBc).13
7 Calculations or interpretation of results .14
7.1 -3 dB frequency, f .14
3 dB
7.2 Calculations for optional reporting methods .15
8 Length normalization .15
9 Results .15
9.1 Information to be provided with each measurement .15
9.2 Information available upon request.15
10 Specification information .16
Annex A (normative) Intramodal dispersion factor and the normalized intermodal
dispersion limit.17

60793-1-41 © IEC:2010 – 3 –
Annex B (normative) Fibre transfer function, H(f), power spectrum, |H(f)|, and f .20
3 dB
Annex C (normative) Calculations for other reporting methods.22
Annex D (normative) Mode scrambler requirements for overfilled launching conditions
to multimode fibres .23
Bibliography.28

Figure 1 – Mandrel wrapped mode filter .10
Figure D.1 – Two examples of optical fibre scramblers .24

Table 1 – DMD weights for calculating overfilled modal bandwidth (OMBc) from DMD
data for 850 nm only .14
Table A.1 – Highest expected dispersion for commercially available A1 fibres .17

– 4 – 60793-1-41 © IEC:2010
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
OPTICAL FIBRES –
Part 1-41: Measurement methods and test procedures –
Bandwidth
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