|
SLOVENSKI STANDARD
01-januar-2019
1DGRPHãþD
SIST EN 60793-1-49:2007
2SWLþQDYODNQD GHO 0HULOQHPHWRGHLQSRVWRSNLSUHVNXãDQMD'LIHUHQþQD
]DNDVQLWHYURGRY ,(&
Optical fibres - Part 1-49: Measurement methods and test procedures - Differential mode
delay (IEC 60793-1-49:2018)
Lichtwellenleiter - Teil 1-49: Messmethoden und Prüfverfahren - Gruppenlaufzeitdifferenz
(IEC 60793-1-49:2018)
Fibres optiques - Partie 1-49: Méthodes de mesure et procédures d'essai - Retard
différentiel de mode (IEC 60793-1-49:2018)
Ta slovenski standard je istoveten z: EN IEC 60793-1-49:2018
ICS:
33.180.10 2SWLþQD YODNQDLQNDEOL Fibres and cables
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 60793-1-49
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2018
ICS 33.180.10 Supersedes EN 60793-1-49:2006
English Version
Optical fibres - Part 1-49: Measurement methods and test
procedures - Differential mode delay
(IEC 60793-1-49:2018)
Fibres optiques - Partie 1-49: Méthodes de mesure et Lichtwellenleiter - Teil 1-49: Messmethoden und
procédures d'essai - Retard différentiel de mode Prüfverfahren - Gruppenlaufzeitdifferenz
(IEC 60793-1-49:2018) (IEC 60793-1-49:2018)
This European Standard was approved by CENELEC on 2018-09-19. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey 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
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60793-1-49:2018 E
European foreword
The text of document 86A/1812/CDV, future edition 3 of IEC 60793-1-49, 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 60793-1-49:2018.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2019-06-19
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2021-09-19
document have to be withdrawn
This document supersedes EN 60793-1-49:2006.
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.
Endorsement notice
The text of the International Standard IEC 60793-1-49:2018 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 standards
indicated:
IEC 60793-2-10 NOTE Harmonized as EN 60793-2-10
IEC 60793-1-42 NOTE Harmonized as EN 60793-1-42
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.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60793-1-1 2017 Optical fibres - Part 1-1: Measurement methods EN 60793-1-1 2017
and test procedures - General and guidance
IEC 60793-1-22 - Optical fibres - Part 1-22: Measurement methods EN 60793-1-22 -
and test procedures - Length measurement
IEC 60793-1-41 - Optical fibres - Part 1-41: Measurement methods - -
and test procedures - Bandwidth
IEC 60793-1-45 - Optical fibres - Part 1-45: Measurement methods EN IEC 60793-1-45 -
and test procedures - Mode field diameter
IEC 60825-1 - Safety of laser products - Part 1: Equipment EN 60825-1 -
classification and requirements
IEC 60825-2 - Safety of laser products - Part 2: Safety of optical EN 60825-2 -
fibre communication systems (OFCS)
IEC 61280-1-4 - Fibre optic communication subsystem test EN 61280-1-4 -
procedures - Part 1-4: General communication
subsystems - Light source encircled flux
measurement method
IEC 60793-1-49
Edition 3.0 2018-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Optical fibres –
Part 1-49: Measurement methods and test procedures – Differential mode delay
Fibres optiques –
Partie 1-49: Méthodes de mesure et procédures d'essai – Retard différentiel de
mode
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.10 ISBN 978-2-8322-5954-2
– 2 – IEC 60793-1-49:2018 © IEC 2018
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Apparatus . 8
4.1 Overview. 8
4.2 Optical source . 9
4.3 Probe fibre . 10
4.4 Scanning stage . 10
4.5 Probe to test sample coupling . 10
4.6 Cladding mode stripper . 10
4.7 Detection system . 10
4.8 Sampler and digitizer . 11
4.9 Computational equipment . 11
4.10 System performance . 11
4.10.1 General . 11
4.10.2 Pulse temporal stability . 12
4.10.3 System stability frequency limit (SSFL) . 12
5 Sampling and specimens . 13
5.1 Test sample . 13
5.2 Specimen end-faces . 13
5.3 Specimen length . 13
5.4 Specimen deployment . 13
5.5 Specimen positioning . 13
6 Procedure . 13
6.1 Fibre coupling and system setup . 13
6.2 Determination of centre . 14
6.3 Measurement of the test sample . 14
6.3.1 Selection of radii and quadrant . 14
6.3.2 Collection of scan data . 14
6.4 Determination of ∆T and ∆T . 14
PULSE REF
6.5 Reference test method . 14
7 Calculations and interpretation of results . 15
7.1 General . 15
7.2 Differential mode delay (DMD) . 15
7.2.1 General . 15
7.2.2 Deconvolution . 15
7.2.3 Pulse folding . 15
7.2.4 Determination of DMD . 16
7.3 Minimum calculated effective modal bandwidth . 17
7.3.1 General . 17
7.3.2 Time domain pulse computation . 17
7.3.3 Calculate the transfer function . 18
7.3.4 Compute the power spectrum . 18
7.3.5 Compute EMB and minEMB . 18
c c
7.4 Length normalization . 18
IEC 60793-1-49:2018 © IEC 2018 – 3 –
8 Documentation . 18
8.1 Information to be reported . 18
8.2 Information available upon request . 19
9 Specification information . 19
Annex A (normative) Source spectral width limitation . 20
A.1 Limiting the effect of chromatic dispersion (CD) on the value of DMD . 20
A.1.1 General . 20
A.1.2 Limit CD contribution to DMD to be measured . 20
A.1.3 Limit CD contribution to reference width . 20
A.1.4 Adjust ∆T to account for CD contribution . 21
REF
A.1.5 High-performance DMD fibres and spectral requirements . 21
A.2 Chromatic dispersion in multimode fibres . 22
Annex B (informative) Determination of fibre optical centre . 23
B.1 General . 23
B.2 Method . 23
Annex C (normative) Detection system modal measurement . 26
C.1 General .
...