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

IEC 60793-1-41:2024 is available as IEC 60793-1-41:2024 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 60793-1-41:2024 describes three methods for determining and measuring the modal bandwidth of multimode optical fibres (see IEC 60793-2-10, IEC 60793-2-30, and the IEC 60793‑2‑40 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) Method A and method 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 A1-OM3 to A1-OM5 multimode fibres 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 is chosen according to the type of fibre. NOTE 1 These test methods are commonly used in production and research facilities and are not easily accomplished in the field. NOTE 2 OFL has been used for the modal bandwidth value for LED-based applications for many years. However, no single launch condition is representative of the laser (e.g. VCSEL) sources that are used for gigabit and higher rate transmission. This fact drove the development of IEC 60793-1-49 for determining the effective modal bandwidth of laser optimized 50 µm fibres. See IEC 60793-2-10 and IEC 61280-4-1 for more information. This fourth edition cancels and replaces the third edition published in 2010. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) the addition of a direct reference for method A and method B.

Lichtwellenleiter - Teil 1-41: Messmethoden und Prüfverfahren - Bandbreite

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

IEC 60793-1-41:2024 est disponible sous forme de IEC 60793-1-41:2024 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 60793-1-31:2024 décrit trois méthodes pour déterminer et mesurer la largeur de bande modale des fibres optiques multimodales (voir l’IEC 60793-2-10, l’IEC 60793-2-30 et l’IEC 60793‑2‑40). 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 de lumière 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 différentiel de mode (DMD, Differential Mode Delay). Les trois méthodes sont les suivantes: Méthode A – Mesure dans le domaine temporel (distorsion d’impulsion) Méthode B – Mesure dans le domaine fréquentiel Méthode C – Largeur de bande modale avec injection saturée calculée à partir du retard différentiel de mode (OMBc, Overfilled launch Modal Bandwidth calculated) Les méthodes A et B peuvent être réalisées en utilisant une méthode d’injection au choix entre: une condition d’injection saturée (OFL, OverFilled Launch) ou une condition d’injection en mode partiel (RML, Restricted Mode Launch). La méthode C est seulement définie pour les fibres multimodales A1-OM3 à A1-OM5 et utilise une sommation pondérée des réponses d’injection de DMD avec les pondérations correspondant à une condition d’injection saturée. La méthode d’essai et la condition d’injection appropriées sont choisies en fonction du type de fibre. NOTE 1 Ces méthodes d’essai sont fréquemment utilisées dans les installations de production et de recherche et ne sont pas facilement réalisées sur site. NOTE 2 La méthode OFL est utilisée depuis de nombreuses années pour la valeur de largeur de bande modale des applications à base de LED. Toutefois, aucune condition d’injection unique n’est représentative des sources laser (par exemple, les diodes laser à cavité verticale émettant par la surface [VCSEL, Vertical-Cavity Surface-Emitting Laser]) qui sont utilisées pour la transmission en gigabits et à des débits supérieurs. Ceci a conduit à l’élaboration de l’IEC 60793-1-49 pour la détermination de la largeur de bande modale effective des fibres à 50 µm optimisées pour les sources laser. Voir l’IEC 60793-2-10:2019 ou plus récente et l’IEC 61280-4-1:2019 ou plus récente pour plus d’informations. Cette quatrième édition annule et remplace la troisième édition parue en 2010. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) l’ajout d’une "référence directe" pour la méthode A et la méthode B.

Optična vlakna - 1-41. del: Merilne metode in postopki preskušanja - Pasovna širina (IEC 60793-1-41:2024)

General Information

Publication Date
Current Stage
6060 - Document made available - Publishing
Start Date
Due Date
Completion Date


Buy Standard

EN IEC 60793-1-41:2024 - BARVE
English language
33 pages
sale 10% off
sale 10% off
e-Library read for
1 day

Standards Content (Sample)

Optična vlakna - 1-41. del: Merilne metode in postopki preskušanja - Pasovna
širina (IEC 60793-1-41:2024)
Optical fibres - Part 1-41: Measurement methods and test procedures - Bandwidth (IEC
Lichtwellenleiter - Teil 1-41: Messmethoden und Prüfverfahren - Bandbreite (IEC 60793-
Fibres optiques - Partie 1-41: Méthodes de mesure et procédures d'essai - Largeur de
bande (IEC 60793-1-41:2024)
Ta slovenski standard je istoveten z: EN IEC 60793-1-41:2024
33.180.10 (Optična) vlakna in kabli Fibres and cables
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.


ICS 33.180.10 Supersedes EN 60793-1-41:2010
English Version
Optical fibres - Part 1-41: Measurement methods and test
procedures - Bandwidth
(IEC 60793-1-41:2024)
Fibres optiques - Partie 1-41: Méthodes de mesure et Lichtwellenleiter - Teil 1-41: Messmethoden und
procédures d'essai - Largeur de bande Prüfverfahren - Bandbreite
(IEC 60793-1-41:2024) (IEC 60793-1-41:2024)
This European Standard was approved by CENELEC on 2024-05-24. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60793-1-41:2024 E

European foreword
The text of document 86A/2302/CDV, future edition 4 of IEC 60793-1-41, prepared by SC 86A "Fibres
and cables" of IEC/TC 86 "Fibre optics" was submitted to the IEC-CENELEC parallel vote and
approved by CENELEC as EN IEC 60793-1-41:2024.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-02-24
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-05-24
document have to be withdrawn
This document supersedes EN 60793-1-41:2010 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60793-1-41:2024 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 60793-2-10 NOTE Approved as EN IEC 60793-2-10
IEC 60793-2-30 NOTE Approved as EN 60793-2-30
IEC 60793-2-40 NOTE Approved as EN IEC 60793-2-40
IEC 61280-4-1 NOTE Approved as EN IEC 61280-4-1
IEC 60793-1-42 NOTE Approved as EN 60793-1-42
IEC 60793-1-1 NOTE Approved as EN IEC 60793-1-1
IEC 60793-1-22 NOTE Approved as EN 60793-1-22
Annex ZA
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60793-1-20 - Optical fibres - Part 1-20: Measurement EN 60793-1-20 -
methods and test procedures - Fibre
IEC 60793-1-43 - Optical fibres - Part 1-43: Measurement EN 60793-1-43 -
methods and test procedures - Numerical
aperture measurement
IEC 60793-1-49 - Optical fibres - Part 1-49: Measurement EN IEC 60793-1-49 -
methods and test procedures - Differential
mode delay
IEC 60793-1-41 ®
Edition 4.0 2024-04
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

ICS 33.180.10  ISBN 978-2-8322-8636-4

– 2 – IEC 60793-1-41:2024 © IEC 2024
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviated terms . 7
3.1 Terms and definitions . 7
3.2 Abbreviated terms . 8
4 Apparatus . 8
4.1 Radiation source . 8
4.1.1 Method A – Time domain (pulse distortion) measurement . 8
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 method A and method B . 8
4.2 Launch system . 9
4.2.1 Overfilled launch (OFL) . 9
4.2.2 Restricted mode launch (RML) . 10
4.2.3 Differential mode delay (DMD) launch . 11
4.3 Detection system . 11
4.4 Recording system . 11
4.5 Computational equipment . 11
4.6 Overall system performance. 11
5 Sampling and specimens . 12
5.1 Test sample . 12
5.2 Reference sample . 12
5.3 End face preparation . 12
5.4 Test sample packaging . 12
5.5 Test sample positioning . 12
6 Procedure . 13
6.1 Method A – Time domain (pulse distortion) measurement . 13
6.1.1 Output pulse measurement . 13
6.1.2 Input pulse measurement method A-1: reference sample from test
sample. 13
6.1.3 Input pulse measurement method A-2: periodic reference sample. 13
6.1.4 Input pulse measurement method A-3: direct reference . 13
6.2 Method B – Frequency domain measurement . 14
6.2.1 Output frequency response . 14
6.2.2 Method B-1: Reference length from test specimen . 14
6.2.3 Method B-2: Reference length from similar fibre . 14
6.2.4 Method B-3: Reference from direct coupling . 14
6.3 Method C – Overfilled launch modal bandwidth calculated from differential
mode delay (OMBc) . 15
7 Calculations or interpretation of results . 16
7.1 Bandwidth (−3 dB), f . 16
3 dB
7.2 Calculations for optional reporting methods . 16
8 Length normalization . 16
9 Results . 16

IEC 60793-1-41:2024 © IEC 2024 – 3 –
9.1 Information to be provided with each measurement . 16
9.2 Information available upon request . 17
10 Specification information . 17
Annex A (normative) Intramodal dispersion factor and the normalized intermodal
dispersion limit . 18
A.1 Intramodal dispersion factor, IDF . 18
A.2 Normalized intermodal dispersion limit, NIDL . 19
A.3 Derivation of the IDF . 19
Annex B (normative) Fibre transfer function, H(f), power spectrum, |H(f)|, and f . 21
3 dB
B.1 Fibre transfer function . 21
B.1.1 Method A – Time domain (pulse distortion) measurement . 21
B.1.2 Method B – Frequency-domain measurement . 21
B.2 Power spectrum . 22
B.2.1 Method A – Time domain (pulse distortion) measurement . 22
B.2.2 Method B – Frequency-domain measurement . 22
B.2.3 Bandwidth (−3 dB), f . 22
3 dB
Annex C (normative) Calculations for other reporting methods . 23
C.1 Fibre impulse response, h(t) . 23
C.2 RMS impulse response, exact method . 23
C.3 RMS impulse response, difference of squares approximation . 24
Annex D (normative) Mode scrambler requirements for overfilled launching conditions

to multimode fibres . 25
D.1 General .

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.