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IEC 60793-2-50
Edition 6.0 2018-12
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Optical fibres –
Part 2-50: Product specifications – Sectional specification for class B single-
mode fibres
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IEC 60793-2-50
Edition 6.0 2018-12
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Optical fibres –
Part 2-50: Product specifications – Sectional specification for class B single-
mode fibres
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.180.10 ISBN 978-2-8322-6361-7
– 2 – IEC 60793-2-50:2018 RLV © IEC 2018
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 8
3 Terms and definitions . 10
4 Abbreviated terms and symbols . 10
5 Specifications . 10
5.1 General . 10
5.2 Dimensional requirements . 10
5.3 Mechanical requirements . 11
5.4 Transmission requirements . 12
5.5 Environmental requirements . 14
5.5.1 General . 14
5.5.2 Optical environmental requirements – Attenuation . 14
5.5.3 Mechanical environmental requirements . 15
Annex A (normative) Family specification for category B1.1 B-652
Dispersion unshifted single-mode fibres . 16
A.1 General . 16
A.2 Dimensional requirements . 16
A.3 Mechanical requirements . 17
A.4 Transmission requirements . 17
A.5 Hydrogen ageing for sub-category B-652.D . 19
A.6 Environmental requirements . 19
Annex (normative) Family specification for category B1.3 single-mode fibres .
Annex B (normative) Family specification for category B.2 B-653 Dispersion shifted
single-mode fibres . 23
B.1 General . 23
B.2 Dimensional requirements . 23
B.3 Transmission requirements . 24
B.3.1 General . 24
B.3.2 Chromatic dispersion coefficient requirement for sub-category B2_a B-
653.A fibres . 24
B.3.3 Chromatic dispersion coefficient requirement for sub-category B2_b B-
653.B fibres . 25
B.4 Environmental requirements . 25
Annex C (normative) Family specification for category B1.2 B-654 cut-off shifted
single-mode fibres . 26
C.1 General . 26
C.2 Dimensional requirements . 26
C.3 Mechanical requirements . 26
C.4 Chromatic dispersion parameters for B-654.E fibres . 28
C.5 Environmental requirements . 28
Annex D (normative) Family specification for category B.4 B-655 non-zero dispersion
shifted single-mode fibres . 29
D.1 General . 29
D.2 Dimensional requirements . 29
D.3 Mechanical requirements . 29
D.4 Transmission requirements . 30
D.4.1 General . 30
D.4.2 Chromatic dispersion coefficient limits for sub-category B4_c B-655.C
fibres . 30
D.4.3 Chromatic dispersion coefficient limits for sub-category B4_d B-655.D
fibres . 31
D.4.4 Chromatic dispersion coefficient limits for sub-category B4_e B-655.E
fibres . 31
D.5 Environmental requirements . 31
Annex E (normative) Family specification for category B5 B-656 Wideband
non-zero dispersion shifted single-mode fibres . 32
E.1 General . 32
E.2 Dimensional requirements . 32
E.3 Mechanical requirements . 32
E.4 Transmission requirements . 33
E.4.1 General . 33
E.4.2 Chromatic dispersion coefficient for category B5 B-656 fibres . 33
E.5 Environmental requirements . 34
Annex F (normative) Family specification for category B6 B-657 Bending
loss insensitive single-mode fibres . 35
F.1 General . 35
F.2 Dimensional requirements . 35
F.3 Mechanical requirements . 36
F.4 Transmission requirements . 36
F.5 Environmental requirements . 39
Annex G (informative) System design information for category category B4 B-655
non-zero disperion shifted single-mode fibres . 40
G.1 General . 40
G.2 One standard deviation limits for sub-category B4_d B-655.D fibres . 40
G.3 One standard deviation limits for sub-category B4_e B-655.E fibres . 41
Annex (informative) Map from IEC nomenclature to ITU-T recommendations .
Bibliography . 44
Figure G.1 – Sub- category B4_d B-655.D chromatic dispersion coefficient limits . 41
Figure G.2 – Sub-category B4_e B-655.E chromatic dispersion coefficient limits . 42
Table 1 – Map of IEC designation to ITU-T Recommendations and IEC 60793-2-
50:2015 designation. 8
Table 2 – Dimensional attributes and measurement methods . 11
Table 3 – Dimensional requirements common to all category B fibres . 11
Table 4 – Mechanical attributes and test methods . 12
Table 5 – Mechanical requirements common to all class B fibres . 12
Table 6 – Transmission attributes and measurement methods . 13
Table 7 – Transmission, requirements common to all class B fibres . 13
Table 8 – Additional transmission attributes required in the family specifications . 13
Table 9 – Environmental exposure tests . 14
Table 10 – Attributes measured in environmental exposure tests . 14
Table 11 – Change in attenuation for environmental tests . 14
– 4 – IEC 60793-2-50:2018 RLV © IEC 2018
Table 12 – Coating strip force for environmental tests . 15
Table 13 – Tensile strength for environmental tests . 15
Table 14 – Stress corrosion susceptibility for environmental tests . 15
Table A.1 – Dimensional requirements specific to category B1.1 B-652.B fibres . 16
Table A.2 – Dimensional requirements specific to category B-652.D fibres . 17
Table A.3 – Mechanical requireme
...