SIST EN IEC 60793-1-41:2024

Optical fibres - Part 1-41: Measurement methods and test procedures - Bandwidth (IEC 60793-1-41:2024)

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 60793-2-30, 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.

Lichtwellenleiter - Teil 1-41: Messmethoden und Prüfverfahren - Bandbreite (IEC 60793-1-41:2024)

Fibres optiques - Partie 1-41: Méthodes de mesure et procédures d'essai - Largeur de bande (IEC 60793-1-41:2024)

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)

Ta del standarda IEC 60793 opisuje tri metode za določanje in merjenje modalne pasovne širine večrodovnih optičnih vlaken (glej standarda IEC 60793-2-10 in IEC 60793-2-30 ter skupino standardov IEC 60793-2-40). Frekvenčni odziv osnovnega frekvenčnega pasu se meri neposredno v frekvenčni domeni z ugotavljanjem odziva vlaken na sinusoidno modulirani svetlobni vir.
Odziv osnovnega frekvenčnega pasu je mogoče izmeriti tudi z opazovanjem širjenja ozkega svetlobnega impulza. Izračunani odziv se določi s podatki o diferenčni zakasnitvi rodov (DMD). Tri metode so:
• metoda A – meritev časovne domene (popačenje impulza)
• metoda B – merjenje frekvenčne domene
• metoda C – prenapolnjena zagonska modalna pasovna širina, izračunana iz diferenčne zakasnitve rodov (OMBc)
Metodi A in B je mogoče izvesti z enim od dveh zagonov: s prenapolnjenim zagonom (OFL) ali zagonom v omejenem načinu (RML). Metoda C je določena le za večrodovna optična vlakna A1-OM3 do A1-OM5 in uporablja uteženo seštevanje zagonskih odzivov DMD z utežmi, ki ustrezajo prenapolnjenemu zagonu. Glede na vrsto vlakna se izbereta ustrezna preskusna metoda in zagonsko stanje.
OPOMBA 1: Te preskusne metode se običajno uporabljajo v proizvodnji in raziskovalnih ustanovah,
na terenu pa jih ni lahko izvesti.
OPOMBA 2: Prenapolnjen zagon se že vrsto let uporablja za vrednost modalne pasovne širine za aplikacije, ki temeljijo na tehnologiji LED. Vendar pa nobeno zagonsko stanje ne predstavlja laserskih virov (npr. VCSEL), ki se uporabljajo za gigabitne in višje hitrosti prenosa. To dejstvo je spodbudilo razvoj standarda IEC 60793-1-49 za določanje efektivne modalne pasovne širine lasersko optimiziranih vlaken s premerom 50 μm. Za več informacij glej standarda IEC 60793-2-10 in IEC 61280-4-1.

General Information

• Status: Published
• Public Enquiry End Date: 22-Jun-2023
• Publication Date: 10-Jun-2024
• ICS: 33.180.10 - Fibres and cables
• Technical Committee: MOC - Mobile Communications
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 05-Jun-2024
• Due Date: 10-Aug-2024
• Completion Date: 11-Jun-2024
• Ref Project: EN IEC 60793-1-41:2024 - Optical fibres - Part 1-41: Measurement methods and test procedures - Bandwidth

Relations

• Revises: SIST EN 60793-1-41:2010 - Optical fibres - Part 1-41: Measurement methods and test procedures - Bandwidth (IEC 60793-1-41:2010)
• Effective Date: 23-Jan-2023
• Revised: SIST EN 60793-1-41:2010 - Optical fibres - Part 1-41: Measurement methods and test procedures - Bandwidth (IEC 60793-1-41:2010)
• Effective Date: 31-May-2022

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2024
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
60793-1-41:2024)
Lichtwellenleiter - Teil 1-41: Messmethoden und Prüfverfahren - Bandbreite (IEC 60793-
1-41:2024)
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
ICS:
33.180.10 (Optična) vlakna in kabli Fibres and cables
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60793-1-41

NORME EUROPÉENNE
EUROPÄISCHE NORM May 2024
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)
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)
applies.
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
geometry
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
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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
INTERNATIONALE
ICS 33.180.10  ISBN 978-2-8322-8636-4

– 2 – IEC 60793-1-41:2024 © IEC 2024
CONTENTS
FOREWORD . 4
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 .
...