IEC 61753-2-3:2001

INTERNATIONAL IEC
STANDARD
61753-2-3
First edition
2001-07
Fibre optic interconnecting devices and passive
components performance standard –
Part 2-3:
Non-connectorised single-mode 1×N and 2×N
non-wavelength-selective branching devices
for Category U –
Uncontrolled environment
Norme de qualité de fonctionnement des dispositifs
d'interconnexion et composants passifs à fibres optiques –
Partie 2-3:
Dispositifs de couplage non-connectorisés monomodes
1×N et 2×N ne dépendant pas de la longueur d'onde
pour catégorie U –
Environnement non contrôlé
Reference number
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INTERNATIONAL IEC
STANDARD
61753-2-3
First edition
2001-07
Fibre optic interconnecting devices and passive
components performance standard –
Part 2-3:
Non-connectorised single-mode 1xN and 2xN
non-wavelength-selective branching devices
for Category U –
Uncontrolled environment
Norme de qualité de fonctionnement des dispositifs
d'interconnexion et composants passifs à fibres optiques –
Partie 2-3:
Dispositifs de couplage non-connectorisés monomodes
1×N et 2×N ne dépendant pas de la longueur d'onde
pour catégorie U –
Environnement non contrôlé
 IEC 2001  Copyright - all rights reserved
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mechanical, including photocopying and microfilm, without permission in writing from the publisher.
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International Electrotechnical Commission
For price, see current catalogue

– 2 – 61753-2-3 © IEC:2001(E)
CONTENTS
FOREWORD . 3

1 Scope . 5

2 Normative references. 5

3 Test . 6

4 Test report . 7

5 Performance requirements . 7

5.1 Sample size, sequencing and grouping . 7
5.2 Test details and requirements . 7
Annex A (informative) Examples of attenuation requirements of 1×N and 2×N branching
devices. 15
Annex B (normative) Sample size, sequencing and grouping. 17
Table A.1 – Attenuation requirements of balanced branching devices having the most
common port configurations for Class 1 application . 15
Table A.2 – Attenuation requirements of 1×2 and 2×2 unbalanced branching
devices having the most common port configurations for Class 1 application. 15
Table A.3 – Attenuation requirements of balanced branching devices having the most
common port configurations for Class 2 application . 16
Table A.4 – Attenuation requirements of balanced branching devices having the most
common port configurations for Class 3 application . 16
Table B.1 – Sample size and sequencing and grouping of tests. 17

61753-2-3 © IEC:2001(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

___________
FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE

COMPONENTS PERFORMANCE STANDARD –

Part 2-3: Non-connectorised single-mode 1×N and 2×N non-wavelength-

selective branching devices for Category U – Uncontrolled environment

FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61753-2-3 has been prepared by subcommittee 86B: Fibre optic
interconnecting devices and passive components, of IEC technical committee 86: Fibre optics.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/1509/FDIS 86B/1548/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
Annex B forms an integral part of this standard.
Annex A is for information only.

– 4 – 61753-2-3 © IEC:2001(E)
The committee has decided that the contents of this publication will remain unchanged until
2008. At this date, the publication will be

• reconfirmed;
• withdrawn;
• replaced by a revised edition, or

• amended.
61753-2-3 © IEC:2001(E) – 5 –
FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE

COMPONENTS PERFORMANCE STANDARD –

Part 2-3: Non-connectorised single-mode 1×N and 2×N non-wavelength-

selective branching devices for Category U – Uncontrolled environment

1 Scope
This part of IEC 61753 contains the minimum initialisation test and measurement require-
ments and severities which a branching device shall satisfy in order to be categorised as
meeting the IEC standard. The requirements cover balanced non-connectorised single-mode
1×N and 2×N non-wavelength-selective branching devices for use in an IEC Category U
environment (N is the number of output ports). The specifications of unbalanced branching
devices are limited to 1×2 and 2×2 devices because they are the most commonly used.
2 Normative references
The following normative documents contain provisions which, through reference in this
text, constitute provisions of this part of IEC 61753. For dated references, subsequent
amendments to, or revisions of, any of these publications do not apply. However, parties to
agreements based on this part of IEC 61753 are encouraged to investigate the possibility of
applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of ISO
and IEC maintain registers of currently valid International Standards.
IEC 60793-1-1:1995, Optical fibres – Part 1: Generic specification – Section 1: General
IEC 61300 (all parts), Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures
IEC 61300-2-1:1995, Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 2-1: Tests – Vibration (sinusoidal)
IEC 61300-2-4:1995, Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 2-4: Tests – Fibre/cable retention
IEC 61300-2-5:1995, Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 2-5: Tests – Torsion/twist

IEC 61300-2-12:1995, Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 2-12: Tests – Impact
IEC 61300-2-14:1997, Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 2-14: Tests – Maximum input power
IEC 61300-2-17:1995, Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 2-17: Tests – Cold
IEC 61300-2-18:1995, Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 2-18: Tests – Dry heat – High temperature
endurance
IEC 61300-2-19:1995, Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 2-19: Tests – Damp heat (steady state)

– 6 – 61753-2-3 © IEC:2001(E)
IEC 61300-2-22:1995, Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 2-22: Tests – Change of temperature

IEC 61300-2-26:1995, Fibre optic interconnecting devices and passive components – Basic

test and measurement procedures – Part 2-26: Tests – Salt mist

IEC 61300-2-27:1995, Fibre optic interconnecting devices and passive components – Basic

test and measurement procedures – Part 2-27: Tests – Dust – Laminar flow

IEC 61300-2-28:1995, Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 2-28: Tests – Industrial atmosphere (sulphur

dioxide)
IEC 61300-2-45:1999, Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 2-45: Tests – Durability test by water immersion
IEC 61300-3-2:1999, Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 3-2: Examinations and measurements – Polarization
dependence of attenuation in a single-mode fibre optic device
IEC 61300-3-3:1997, Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 3-3: Examinations and measurements – Monitoring
change in attenuation and in return loss (multiple paths)
IEC 61300-3-5:2001, Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 3-5: Examinations and measurements – Wavelength
dependence of attenuation
IEC 61300-3-6:1997, Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 3-6: Examinations and measurements – Return loss
IEC 61300-3-20:2001, Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 3-20: Examinations and measurements – Directivity
of fibre optic branching devices
IEC 61753-2-1:2000, Fibre optic interconnecting devices and passive components
performance standard – Part 2-1: Fibre optic connectors terminated on single-mode fibre for
category U – Uncontrolled environment
3 Test
All test methods are in accordance with the IEC 61300 series of standards.

The samples shall be terminated onto single-mode fibres according to Type B1.1 of
IEC 60793-1-1 in either coated fibres (primary and secondary) or reinforced cable format.
Each test defines the number of samples to be evaluated.
All tests shall be carried out to validate performance over the optical pass-bands of 1 260 nm
to 1 360 nm and 1 480 nm to 1 580 nm. This is the minimum requirement for devices corres-
ponding to Class 1 as described in 5.2. Extensions to these windows are covered by classes
2 and 3. Class 2 specifies additional attenuation limits for 1 450 nm to 1 480 nm and 1 580 nm
to 1 600 nm. Class 3 devices shall meet Class 2 requirements and additionally have defined
attenuation limits for 1 600 nm to 1 650 nm.

61753-2-3 © IEC:2001(E) – 7 –
4 Test report
Fully documented test reports and supporting evidence shall be prepared and be available for

inspection as evidence that the tests have been carried out and complied with.

5 Performance requirements
5.1 Sample size, sequencing and grouping

Sample sizes for the tests are defined in annex B of this document.

Test groups and test sequences shall be performed individually or in sequential order as
shown in annex B.
When testing in sequential order, the test sequence shown in annex B shall be followed
5.2 Test details and requirements
Attenuation and return loss performances are given only for non-connectorised branching
devices. For connectorised components the connector performances shall be in compliance
with IEC 61753-2-1.
During the environmental tests where monitoring of the branching device is needed, all ports
of the device shall be controlled.

– 8 – 61753-2-3 © IEC:2001(E)
No. Tests Requirements Details

1 Attenuation The attenuation requirements of 1×N and 2×N IEC 61300-3-5

balanced branching devices are given for

Three classes of Fibre lengths of the branching device
each Class in Eq. 1, 2 and 3, while the
requirements have
pigtail: ≥2 m
attenuation requirements of 1×2 and 2×2
been identified for
unbalanced branching devices are expressed

Launch fibre lengths: ≥2 m
attenuation
in Eq 1′, only for Class 1.
requirements:
Source:
Eq. 1 (pass-band 1 260 nm to 1 360 nm and

the stability at the operating wavelength
1) Class 1 for standard
1 480 nm to 1 580 nm)
shall be better than ±0,05 dB over the
and obligatory
measuring period
requirements for              1×N         2×N

telecom operation in
Unpolarised source
A max. (dB)  0,6 + 3,6 × log N  0,9 + 3,6 × log N
2 2
1 260 nm – 1 360 nm
and 1 480 nm –
Launch conditions:
A min. (dB)  2,7 × log N      2,7 × log N – 0,1
2 2
1 580 nm bands
the wavelength of the source shall be
(attenuation
(See also table A.1 of annex A)
longer than the cut-off wavelength of the
requirements in Eq. 1
fibre
for balanced devices
and in Eq. 1′ for
Wavelength bands:
Eq. 1′  A max. (dB) = 25,5 – 12,5 log (P %)
unbalanced devices)
1 260 nm – 1 360 nm and 1 480 nm –
where P % is the nominal percentage of the
1 580 nm (Class 1),
power associated with one port
1 260 nm – 1 360 nm and 1 450 nm –
2) Class 2 for extended 1 600 nm (Class 2) and
(See also table A.2 of annex A)
wavelength operation 1 260 nm – 1 360 nm and 1 450 nm –
over a pass-band of 1 650 nm (Class 3)
150 nm around the
Detector system:
Eq. 2 (pass-band 1 450 nm to 1 480 nm and
1 550 nm optical
linearity within ±0,05 dB
1 580 nm to 1 600 nm)
window (attenuation
requirements in Eq. 1
1×N         2×N spectral response matched to source
and Eq. 2
simultaneously) dynamic range within the attenuation
A max. (dB)  0,6 + 3,7 × log N  0,9 + 3,7 × log N
2 2
values to be measured
A min. (dB)  2,5 × log N + 0,1   2,5 × log N
2 2
wavelength resolution: ≤10 nm
3) Class 3 for further
(See also table A.3 of annex A)
extended band-pass
wavelength accuracy: ±1 nm
between 1 600 nm and
The minimum and maximum attenuation
1 650 nm for
Eq. 3 (pass-band 1 600 nm to 1 650 nm)
values apply to any combination of
maintenance operation
input/output ports
(attenuation
1×N         2×N
requirements in Eq. 1,
A max. (dB)  0,6 + 3,9 × log N  0,9 + 3,9 × log N
Eq. 2 and Eq. 3 2 2
simultaneously)
A min. (dB) 2,4 × log2N – 0,1  2,4 × log2N – 0,2
(See also table A.4 of annex A)
2Directivity ≥35 dB Class T IEC 61300-3-20
Details: same as in test No. 1
≥45 dB Class U
All ports not under test shall be
≥55 dB Class V
terminated to avoid unwanted reflections
over the operating wavelength range
contributing to the measurement

Other conditions:
the directivity shall be measured
between any pair of input or output ports

61753-2-3 © IEC:2001(E) – 9 –
3a Return loss ≥35 dB Class T IEC 61300-3-6, Method 1

(branching device
Branching device:
≥45 dB Class U
method)
nominal splitting ratio: 50/50

directivity: >60 dB
Source:
central wavelength: 1 310 nm ± 20 nm,

1 550 nm ± 20 nm, 1 625 nm ± 20 nm

spectral width: ≤20 nm
stability at the operating wavelength in a
period of at least 1 h: within ±0,05 dB

Detector
...