oSIST prEN IEC 61280-4-2:2023
(Main)Fibre-optic communication subsystem test procedures - Part 4-2: Installed cable plant - Single-mode attenuation and optical return loss measurement
Fibre-optic communication subsystem test procedures - Part 4-2: Installed cable plant - Single-mode attenuation and optical return loss measurement
Prüfverfahren für Lichtwellenleiter-Kommunikationsuntersysteme - Teil 4-2: Installierte Kabelanlagen - Einmoden-Dämpfungs- und optische Rückflussdämpfungsmessung
Procédures d'essai des sous-systèmes de télécommunication à fibres optiques - Partie 4-2: Installations câblées - Mesure de l'affaiblissement de réflexion optique et de l'affaiblissement des fibres unimodales
Postopki za preskušanje optičnih komunikacijskih podsistemov - 4-2. del: Kabelska inštalacija - Meritve slabljenja v enorodovnih vlaknih in optičnih povratnih izgub
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Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN IEC 61280-4-2:2023
01-september-2023
Postopki za preskušanje optičnih komunikacijskih podsistemov - 4-2. del:
Kabelska inštalacija - Meritve slabljenja v enorodovnih vlaknih in optičnih
povratnih izgub
Fibre-optic communication subsystem test procedures - Part 4-2: Installed cable plant -
Single-mode attenuation and optical return loss measurement
Prüfverfahren für Lichtwellenleiter-Kommunikationsuntersysteme - Teil 4-2: Installierte
Kabelanlagen - Einmoden-Dämpfungs- und optische Rückflussdämpfungsmessung
Procédures d'essai des sous-systèmes de télécommunication à fibres optiques - Partie 4
-2: Installations câblées - Mesure de l'affaiblissement de réflexion optique et de
l'affaiblissement des fibres unimodales
Ta slovenski standard je istoveten z: prEN IEC 61280-4-2:2023
ICS:
33.180.01 Sistemi z optičnimi vlakni na Fibre optic systems in
splošno general
oSIST prEN IEC 61280-4-2:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN IEC 61280-4-2:2023
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oSIST prEN IEC 61280-4-2:2023
86C/1876/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 61280-4-2 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2023-07-21 2023-10-13
SUPERSEDES DOCUMENTS:
86C/1852/CD, 86C/1865A/CC
IEC SC 86C : FIBRE OPTIC SYSTEMS AND ACTIVE DEVICES
SECRETARIAT: SECRETARY:
United States of America Mr Fred Heismann
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
SC 86A,SC 86B
Other TC/SCs are requested to indicate their interest, if
any, in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In So me
Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is
the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Fibre-optic communication subsystem test procedures - Part 4-2: Installed cable plant - Single-
mode attenuation and optical return loss measurement
PROPOSED STABILITY DATE: 2027
NOTE FROM TC/SC OFFICERS:
Copyright © 2023 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to
download this electronic file, to make a copy and to print out the content for the sole purpose of preparing National
Committee positions. You may not copy or "mirror" the file or printed version of the document, or any part of it,
for any other purpose without permission in writing from IEC.
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oSIST prEN IEC 61280-4-2:2023
IEC CDV 61280-4-2/Ed3 © IEC 2023 – 2 – 86C/1876/CDV
1 CONTENTS
2
3 FOREWORD . 8
4 INTRODUCTION . 10
5 1 Scope . 11
6 2 Normative references . 11
7 3 Terms, definitions, graphical symbols, and abbreviated terms . 11
8 3.1 Terms and definitions . 12
9 3.2 Graphical symbols . 14
10 3.3 Abbreviated terms . 16
11 4 Measurement methods . 16
12 4.1 General . 16
13 4.1.1 Document structure . 16
14 4.1.2 Attenuation . 16
15 4.1.3 Optical return loss . 17
16 4.2 Cabling configurations and applicable test methods . 17
17 4.2.1 Cabling configurations and applicable test methods for attenuation
18 measurements . 17
19 4.2.2 Cabling configurations and applicable test methods for optical return
20 loss measurements . 20
21 5 Overview of uncertainties for attenuation measurements . 20
22 5.1 General . 20
23 5.2 Sources of significant uncertainties . 21
24 5.3 Consideration of the power meter . 21
25 5.4 Consideration of test cord and connector grade . 21
26 5.4.1 Mode field diameter variation . 21
27 5.5 Reflections from other interfaces. 21
28 5.6 Optical source . 22
29 5.7 Output power reference . 22
30 5.8 Bi-directional measurements . 22
31 5.9 Typical uncertainties for attenuation methods A, B, C, and D . 22
32 5.10 Typical uncertainty values for single-mode attenuation testing for method E . 23
33 6 Apparatus . 24
34 6.1 General . 24
35 6.2 Light source . 24
36 6.2.1 Stability . 24
37 6.2.2 Spectral characteristics . 24
38 6.3 Launch cord . 25
39 6.4 Receive or tail cords . 25
40 6.5 Substitution cord . 26
41 6.6 Power meter – LSPM methods only. 26
42 6.7 OTDR apparatus . 26
43 6.8 Return loss test set . 27
44 6.9 Connector end-face cleaning and inspection equipment . 28
45 6.10 Adapters . 28
46 7 Procedures . 28
47 7.1 General . 28
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48 7.2 Common procedures . 29
49 7.2.1 Care of the test cords . 29
50 7.2.2 Make reference measurements (LSPM and OCWR methods only) . 29
51 7.2.3 Inspect and clean the ends of the fibres in the cabling . 29
52 7.2.4 Make the measurements . 29
53 7.2.5 Make the calculations . 29
54 7.3 Calibration . 30
55 7.4 Safety . 30
56 8 Calculations . 30
57 9 Documentation . 30
58 9.1 Information for each test . 30
59 9.2 Information to be made available . 30
60 Annex A (normative) One-cord reference method . 31
61 A.1 Applicability of test method . 31
62 A.2 Apparatus . 31
63 A.3 Procedure . 31
64 A.4 Calculation . 32
65 A.5 Components of reported attenuation . 33
66 Annex B (normative) Three-cord reference method . 34
67 B.1 Applicability of test method . 34
68 B.2 Apparatus . 34
69 B.3 Procedure . 34
70 B.4 Calculations . 35
71 B.5 Components of reported attenuation . 35
72 Annex C (normative) Two-cord reference method . 36
73 C.1 Applicability of test method . 36
74 C.2 Apparatus . 36
75 C.3 Procedure . 36
76 C.4 Calculations . 38
77 C.5 Components of reported attenuation . 38
78 Annex D (normative) Equipment cord method . 39
79 D.1 Applicability of the test method . 39
80 D.2 Apparatus . 39
81 D.3 Procedure . 39
82 D.4 Calculation . 40
83 D.5 Components of reported attenuation . 41
84 Annex E (normative) Optical time domain reflectometer . 42
85 E.1 Applicability of test method . 42
86 E.2 Apparatus . 42
87 E.2.1 General . 42
88 E.2.2 OTDR . 42
89 E.2.3 Test cords . 42
90 E.3 Procedure (test method) . 43
91 E.4 Calculation of attenuation . 44
92 E.4.1 General . 44
93 E.4.2 Connection location . 44
94 E.4.3 Definition of the power levels F and F . 45
1 2
95 E.4.4 Alternative calculation. 46
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96 E.5 Calculation of optical return loss . 47
97 E.6 Calculation of reflectance for discrete components . 49
98 E.7 OTDR uncertainties . 51
99 Annex F (normative) Continuous wave optical return loss measurement – Method A. 52
100 F.1 Applicability of test method . 52
101 F.2 Apparatus . 52
102 F.2.1 General . 52
103 F.2.2 Light source . 52
104 F.2.3 Branching device or coupler . 52
105 F.2.4 Power meters . 53
106 F.2.5 Connector interface . 53
107 F.2.6 Low reflection termination . 53
108 F.3 Procedure . 53
109 F.3.1 Test set characterization. 53
110 F.3.2 Measurement procedure . 55
111 F.3.3 Calculations . 55
112 Annex G (normative) Continuous wave optical return loss measurement – Method B . 57
113 G.1 Applicability of test method . 57
114 G.2 Apparatus . 57
115 G.2.1 General requirements . 57
116 G.2.2 Known reflectance termination . 57
117 G.3 Procedure . 58
118 G.3.1 Set-up characterization . 58
119 G.3.2 Measurement procedure . 58
120 G.3.3 Calculation . 59
121 Annex H (normative) On the use of reference-grade test cords . 60
122 H.1 General . 60
123 H.2 Practical configurations and assumptions. 60
124 H.2.1 Component specifications . 60
125 H.2.2 Conventions . 61
126 H.2.3 Reference planes . 61
127 H.3 Impact of using reference-grade test cords for recommended LSPM methods . 62
128 H.4 Examples for LSPM measurements . 62
129 H.4.1 Example 1 (configuration A, one-cord method, Annex A) . 62
130 H.4.2 Example 2 (configuration B, three-cord method, Annex B) . 63
131 H.4.3 Example 3 (configuration C, two-cord method, Annex C) . 63
132 H.4.4 Example 4 – Long haul system (one-cord reference) . 63
133 H.5 Impact of using reference-grade test cords for different configurations using
134 the OTDR test method . 64
135 H.5.1 Cabling configurations A, B and C . 64
136 H.5.2 Cabling configuration D . 65
137 Annex I (informative) OTDR configuration information . 67
138 I.1 Introductory remarks . 67
139 I.2 Fundamental parameters that define the operational capability of an OTDR . 68
140 I.2.1 Dynamic range . 68
141 I.2.2 Dynamic margin . 68
142 I.2.3 Pulse width . 68
143 I.2.4 Averaging time . 68
144 I.2.5 Dead zone . 68
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145 I.3 Other parameters . 69
146 I.3.1 Index of refraction . 69
147 I.3.2 Measurement range . 69
148 I.3.3 Distance sampling . 69
149 I.4 Other measurement configurations . 69
150 I.4.1 General . 69
151 I.4.2 Macrobend attenuation measurement . 69
152 I.4.3 Splice attenuation measurement . 70
153 I.4.4 Measurement with high reflection connectors or short length cabling . 70
154 I.4.5 Ghost . 72
155 I.5 More on the measurement method . 73
156 I.6 Bi-directional measurement . 74
157 I.7 OTDR bi-directional trace analysis . 75
158 I.8 Non-recommended practices. 76
159 I.8.1 Measurement without tail cord . 76
160 I.8.2 Two cursors measurement . 76
161 Annex J (informative) Test cord attenuation verification . 77
162 J.1 Introductory remarks . 77
163 J.2 Apparatus . 77
164 J.3 Procedure . 77
165 J.3.1 General . 77
166 J.3.2 Test cord verification for the one-cord and two-cord reference test
167 methods when using non-pinned/unpinned and non-plug/socket style
168 connectors . 78
169 J.3.3 Test cord verification for the one-cord and two-cord reference test
170 methods using pinned/unpinned or plug/socket style connectors . 79
171 J.3.4 Test cord verification for the three-cord reference test method using
172 non-pinned/unpinned and non-plug/socket style connectors. 81
173 J.3.5 Test cord verification for the three-cord reference test method using
174 pinned/unpinned or plug/socket style connectors . 83
175 Annex K (informative) Spectral attenuation measurement . 85
176 K.1 Applicability of test method . 85
177 K.2 Apparatus . 85
178 K.2.1 Broadband light source . 85
179 K.2.2 Optical spectrum analyser . 85
180 K.3 Procedure . 85
181 K.3.1 Reference scan . 85
182 K.3.2 Measurement scan . 86
183 K.4 Calculations . 86
184 Bibliography . 87
185
186 Figure 1 – Connector symbols . 15
187 Figure 2 – Symbol for cabling under test . 15
188 Figure 3 – Configuration A – Start and end of measured attenuations in RTM . 18
189 Figure 4 – Configuration B – Start and end of measured attenuations in RTM . 19
190 Figure 5 – Configuration C – Start and end of measured attenuations in RTM . 19
191 Figure 6 – Configuration D – Start and end of measured attenuation in RTM . 19
192 Figure 7 – Typical OTDR schematic . 27
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193 Figure 8 – Illustration of return loss test set . 28
194 Figure A.1 – One-cord reference measurement . 32
195 Figure A.2 – One-cord test measurement . 32
196 Figure B.1 – Three-cord reference measurement . 34
197 Figure B.2 – Three-cord test measurement . 35
198 Figure C.1 – Two-cord reference measurement. 37
199 Figure C.2 – Two-cord test measurement. 37
200 Figure C.3 – Two-cord test measurement for plug-socket style connectors . 37
201 Figure D.1 – Reference measurement . 40
202 Figure D.2 – Test measurement . 40
203 Figure E.1 – Test measurement for OTDR method . 44
204 Figure E.2 – Location of the cabling under test ports . 45
205 Figure E.3 – Graphic construction of F and F . 46
1 2
206 Figure E.4 – Graphic construction of F , F , F and F . 47
1 11 21 2
207 Figure E.5 – Graphic representation of OTDR ORL measurement . 49
208 Figure E.6 – Graphic representation of reflectance measurement . 50
209 Figure F.1 – Return loss test set illustration . 52
210 Figure F.2 – Measurement of the system internal attenuation P . 54
ref2
211 Figure F.3 – Measurement of the system internal attenuation P . 54
ref1
212 Figure F.4 – Measurement of the system reflected power P . 54
rs
213 Figure F.5 – Measurement of the input power P . 55
in
214 Figure F.6 – Measurement of the reflected power . 55
215 Figure G.1 – Return loss test set illustration . 57
216 Figure G.2 – Measurement of P with reflections suppressed . 58
rs
217 Figure G.3 – Measurement of P with reference reflector . 58
ref
218 Figure G.4 – Measurement of the system reflected power P . 59
rs
219 Figure G.5 – Measurement of the reflected power .
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