IEC 61753-051-3:2013

IEC 61753-051-3 ®
Edition 2.0 2013-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Performance
standard –
Part 051-3: Single-mode fibre, plug style fixed attenuators for category U –
Uncontrolled environment
Dispositifs d’interconnexion et composants passifs à fibres optiques – Norme
de performance –
Partie 051-3: Affaiblisseurs fixes de type fiche pour fibres unimodales en
catégorie U – Environnement non-contrôlé

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IEC 61753-051-3 ®
Edition 2.0 2013-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Performance

standard –
Part 051-3: Single-mode fibre, plug style fixed attenuators for category U –

Uncontrolled environment
Dispositifs d’interconnexion et composants passifs à fibres optiques – Norme

de performance –
Partie 051-3: Affaiblisseurs fixes de type fiche pour fibres unimodales en

catégorie U – Environnement non-contrôlé

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX P
ICS 33.180.20 ISBN 978-2-83220-629-4

– 2 – 61753-051-3 © IEC:2013
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 Dimensions . 7
5.3 Test details and requirements . 7
Annex A (normative) Reference connector and adaptor . 14
Annex B (normative) Sample size and product sourcing requirements . 15

Table 1 – Test details and requirements (1 of 7) . 7
Table A.1 – Requirements for reference connector and adaptor . 14
Table B.1 − Sample size and product sourcing requirements . 15

61753-051-3 © IEC:2013 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
PERFORMANCE STANDARD –
Part 051-3: Single-mode fibre, plug style fixed
attenuators for category U –
Uncontrolled environment
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of 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, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). 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. 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 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 IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
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expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61753-051-3 has been prepared by subcommittee 86B. Fibre optic
interconnecting devices and passive components of IEC technical committee 86: Fibre optics.
This second edition cancels and replaces the first edition published in 2001 and constitutes a
technical revision. The specific technical changes from the previous edition are to reconsider
test details and requirement and the constitution of the standard.

– 4 – 61753-051-3 © IEC:2013
The text of this standard is based on the following documents:
FDIS Report on voting
86B/3543/FDIS 86B/3580/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 2.
A list of all the parts in the IEC 61753 series, published under the general title Fibre optic
interconnecting devices and passive components – Performance standard can be found on
the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
61753-051-3 © IEC:2013 – 5 –
FIBRE OPTIC INTERCONNECTING
DEVICES AND PASSIVE COMPONENTS –
PERFORMANCE STANDARD –
Part 051-3: Single-mode fibre, plug style fixed
attenuators for category U –
Uncontrolled environment
1 Scope
This part of IEC 61753 contains the minimum initial test and measurement requirements and
severities which a fibre optic attenuator satisfies in order to be categorized as meeting the
requirements of single-mode fibre, plug-style fixed attenuator devices used in uncontrolled
environments. Optical performances specified in this standard relate to plug-style
configurations optical attenuators only.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60793-2-50, Optical fibres – Part 2-50: Product specifications – Sectional specification for
class B single-mode fibres
IEC 61300-2-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-1: Tests – Vibration (sinusoidal)
IEC 61300-2-2, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-2: Tests – Mating durability
IEC 61300-2-6, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-6: Tensile strength of coupling mechanism
IEC 61300-2-9, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-9: Tests – Shock
IEC 61300-2-12, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-12: Tests – Impact
IEC 61300-2-14, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-14: Tests – High optical power
IEC 61300-2-17, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-17: Tests – Cold
—————————
A fourth edition is due to be published shortly.

– 6 – 61753-051-3 © IEC:2013
IEC 61300-2-18, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-18: Tests – Dry heat– High temperature endurance
IEC 61300-2-22, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 2-22: Tests – Change of temperature
IEC 61300-2-26, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 2-26: Tests –Salt mist
IEC 61300-2-27, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 2-27: Tests – Dust – Laminar flow
IEC 61300-2-46, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 2-46: Tests – Damp heat, cyclic
IEC 61300-3-2, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-2: Examination and measurements – Polarization
dependent loss in a single-mode fibre optic device
IEC 61300-3-3, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-3: Examinations and measurement – Active monitoring of
changes in attenuation and return loss
IEC 61300-3-4, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-4: Examinations and measurements – Attenuation
IEC 61300-3-6, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-6: Examinations and measurements – Return loss
IEC 61300-3-7, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-7: Examinations and measurements – Wavelength
dependence of attenuation and return loss of single mode components
IEC 61300-3-28, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 3-28: Examinations and measurements – Transient loss
IEC 61754 (all parts), Fibre optic connector interfaces
IEC 61755 (all parts), Fibre optic connector optical interfaces
IEC/TR 62627-02:2010, Fibre optic interconnecting devices and passive components –
Part 02: Report of round robin test results on SC plug style fixed attenuators
3 Test
All test methods are in accordance with the IEC 61300 series.
All tests shall be carried out to validate performance over the required operating wavelength
and power range.
—————————
A third edition is due to be published shortly.

61753-051-3 © IEC:2013 – 7 –
4 Test report
Fully documented test reports and supporting evidence shall be prepared and shall 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
The sample size to be used for the tests shall be as defined in Annex B. Test groups shall be
performed as shown in Annex B.
5.2 Dimensions
Dimensions of mechanical interface for mating, plug and receptacle size shall comply with
both the IEC 61754 series and the IEC 61755 series. Other dimensions shall comply with
those given in appropriate manufacturer's drawings.
When implementing this standard be aware that there have been problems when using a rigid
interface component with SC plug style adaptors and plugs. See Clause 6 of
IEC/TR 62627-02:2010
5.3 Test details and requirements
Table 1 defines the performance requirements and test details for plug style fixed attenuators.
Table 1 – Test details and requirements (1 of 7)
No. Tests Requirements Details
Passband: 1 260 nm-1 360 nm
1 Insertion loss Method: IEC 61300-3-4, test sample
and/or 1 460 nm –
configuration according to IEC 61300-3-
1 625 nm
4 substitution method.
For nominal values ≤ 5 dB the Launch patchcord ≥ 2 m. Only the fundamental mode shall
length:
tolerance shall be  ≤ ± 0.75 dB propagate at the attenuator interface
around the nominal insertion and at the detector.
loss value
Other This test shall be performed against a

a, b
requirements: reference plug and reference adaptor .
For nominal values > 5 dB the
This test shall be performed twice,
tolerance shall be ≤ ± 15 %
reversing the sample.
around the nominal insertion
loss value
Launch conditions: The wavelength of the source shall be
longer than cut-off wavelength of the
fibre.
Optical source 1 310 nm ± 10 nm, 1 550 nm ± 10 nm
wavelength:
and 1 625 nm ± 10 nm. Test every
sample with the three wavelengths.

Source power
Within ± 0,05 dB over the measuring
stability: period or at least 1 h.
Total uncertainty:
≤ ± 0,1 dB
– 8 – 61753-051-3 © IEC:2013
Table 1 (2 of 7)
No. Tests Requirements Details
≥ 35 dB for attenuator Grade T
2 Return loss Method: IEC 61300-3-6 measurement method 1,
≥ 40 dB for attenuator Grade R
OCWR (performed against a reference
a,b
≥ 50 dB for attenuator Grade U
plug and reference adaptor )
≥ 60 dB for attenuator Grade V measurement with a branching device.

mated
Optical source
1 310 nm ± 10 nm, 1 550 nm ± 10 nm
≥ 55 dB for attenuator Grade V
wavelength:
and 1 625 nm ± 10 nm. Test every
unmated
sample with the three wavelengths.

Other This test shall be performed twice,
requirements: reversing the sample. Both
measurements shall be within the
specified limits.
Total uncertainty:
≤ ± 0,5 dB
3 Polarization ≤ 0,3 dB at 1 550 nm. The Method: IEC 61300-3-2, all polarization method
dependent samples shall be terminated
loss
onto single-mode fibres as per Optical source
1 310 nm ± 10 nm
IEC 60793-2-50, Type B1.1, in
wavelength:
1 550 nm ± 10 nm
either coated fibres (primary
1 625 nm ± 10 nm
and secondary) or reinforced
Test every sample with one wavelength,
cable format
Total uncertainty:
≤ ± 0,05 dB over the dynamic range to
be measured
4 Polarization Method: IEC 61300-3-32, MPS method
≤0,2 ps
mode
Over the specified operating
dispersion
wavelength range
Optical source
1 310 nm ± 10 nm
Wavelength:
1 550 nm ± 10 nm
1 625 nm ± 10 nm
Test every sample with one wavelength,
changing wavelength for each sample

Total uncertainty:
≤± 0,05 dB over the dynamic range to
be measured
5 High optical Before and after the test the Method: IEC 61300-2-14
power insertion loss shall meet the
requirements of test 1.
Test temperature:
25 °C ± 2 °C
Before and after the test the
Optical source
1 310 nm ± 10 nm
return loss shall meet the
Wavelength:
1 550 nm ± 10 nm
requirements of test 2.
1 625 nm ± 10 nm
During the test insertion loss
Test every sample with one wavelength,
and return loss shall be
changing wavelength for each sample.
monitored
Test duration: 1 h at each power level
Power increments: For nominal insertion loss ≤ 5 dB:
100 mW power increments.
For nominal insertion loss> 5 dB:
10 mW continuous power increments

The above increments are applied up to
the maximum allowed power input of:

- 10 dBm for 1,25 mm ferrule;
- 20 dBm for 2,5 mm ferrule
61753-051-3 © IEC:2013 – 9 –
Table 1 (3 of 7)
No. Tests Requirements Details
6 Vibration Before and after the test the Method: IEC 61300-2-1
insertion loss shall meet the During the test the change in insertion
requirements of test 1 . loss shall be measured by transient loss
test method IEC 61300-3-28.
Before and after the test the
return loss shall meet the
Frequency range: 10 Hz to 55 Hz
requirements of test 2.
Constant vibration 0,75 mm
The insertion loss change
amplitude:
during the test shall be within
Number of cycles: 15
± 0,5 dB of the initial value.

Number of axes: 3 orthogonal
Sweep rate: 1 oct/min
Optical source
1 310 nm ± 10 nm
Wavelength:
1 550 nm ± 10 nm
1 625 nm ± 10 nm
Test every sample with one wavelength,
changing wavelength for each sample

Specimen optically Yes
functioning:
7 Strength of Before and after the test the Method: IEC 61300-2-6
coupling insertion loss shall meet the
mechanism requirements of test 1.
Magnitude of the 40 N, at a rate of 2 N/s

load:
Before and after the test the
return loss shall meet the
Load application 0,2 m from the optical interface
requirements of test 2.
point:
The insertion loss change
Duration of the 120 s
during the test shall be
load:
within ± 0,5 dB of the initial

value.
Optical source 1 310 nm ± 10 nm
wavelength:
1 550 nm ± 10 nm
1 625 nm ± 10 nm
Test every sample with one
wavelength, changing wavelength
for each sample.
Specimen Yes
optically
functioning:
– 10 – 61753-051-3 © IEC:2013
Table 1 (4 of 7)
No. Tests Requirements Details
M  at  ing       B ef  or  e  an  d  af  t er   t he   t es  t  t he         M  et  hod:              I EC   6 13  00  - 2 - 2
8 durability insertion loss shall meet the
requirements of test 1
Number of mating 500, all parts (connector-attenuator-

cycles: adaptor-connector) shall be demated
Before and after the test the and mated
return loss shall meet the
Optical source
1 310 nm ± 10 nm
requirements of test 2
wavelength:
1 550 nm ± 10 nm
1 625 nm ± 10 nm
The insertion loss change during

the test shall be within ± 0,5 dB
Test every sample with one
of the initial value
wavelength, changing wavelength for
each sample
Specimen optically Yes
functioning:
Other
Preconditioning procedure: clean plug
specifications:
and adaptor according to
manufacturer’s instructions.
In situ conditioning procedure: clean
the mechanical and optical alignment
parts of the moving connector
according to the manufacturer
instructions after cycle 24, 74, 124,
and 174. Clean both the moving and
stationary connectors and adaptor
according to the manufacturer
instructions after cycle 49, 99, 149,
and 199. No additional cleaning or re-
cleaning is allowed.
Recovery procedure: the mechanical
and optical alignment parts of the
specimen may be cleaned according
to manufacturer instructions up to 2
times after the final mating cycle
9 Impact Before and after the test the Method: IEC 61300-2-12, Method A
insertion loss shall meet the
requirements of test 1.
Before and after the test the
Drop height: 1,5 m
return loss shall meet the
requirements of test 2.
Specimen optically No
functioning:
Specimen shall be unmated
during the test, dust covers in
place
10 Cold During the test the maximum Method: IEC 61300-2-17: During the test the
allowed change in insertion loss change in insertion loss shall be
is: measured by test method
≤ 0,5 dB for attenuator ≤ 5 dB IEC 61300-3-3

≤ 10% for attenuators > 5 dB
Temperature: –25 °C ± 2 °C
Before and after the test the
insertion loss requirements of Duration of the 96 h
test No 1 shall be met. exposure:

1 310 nm ± 10 nm
Optical source
Before and after the test the
1 550 nm ± 10 nm
wavelength:
return loss requirement of test
1 625 nm ± 10 nm
No 2 shall be met.
Test every sample with one
wavelength, changing wavelength for
each sample
Maximum 1 h
sampling interval
during the test:
Specimen Yes
optically
functioning:
61753-051-3 © IEC:2013 – 11 –
Table 1 (5 of 7)
No. Tests Requirements Details
11 Dry heat During the test the maximum Method: IEC 61300-2-18
allowed change in insertion loss During the test the change in insertion
is: loss shall be measured by test method
IEC 61300-3-3
≤ 0,5 dB for attenuator ≤ 5 dB
Temperature: + 70 °C ± 2 °C
≤ 10 % for attenuators > 5 dB
Duration of the 96 h
Before and after the test the
insertion loss requirements of exposure:
Optical source
test No 1 shall be met 1 310 nm ± 10 nm
Wavelength:
1 550 nm ± 10 nm
Before and after the test the
1 625 nm ± 10 nm
return loss requirement of test
Test every sample with one
No 2 shall be met
wavelength, changing wavelength for

each sample
Maximum 1 h
sampling interval
during the test:
Specimen Yes
optically
functioning:
12 Damp heat During the test the maximum Method: IEC 61300-2-46
(cyclic) allowed change in insertion loss
is: During the test the change in
≤ 0,5 dB for attenuator ≤ 5 dB Insertion Loss shall be measured by
test method IEC 61300-3-3
≤ 10 % for attenuators > 5 dB
High temperature:
Before and after the test the +55 °C ± 2 °C

insertion loss requirements of
Low temperature:
test No 1 shall be met +25 °C ± 2 °C

Before and after the test the Humidity:
>95 % RH ± 2 % RH
return loss requirement of test
Number of cycles: 4
No 2 shall be met
Duration of each 24 h
cycle:
Optical source 1 310 nm ± 10 nm
wavelength:
1 550 nm ± 10 nm
1 625 nm ± 10 nm
Test every sample with one
wavelength, changing wavelength for
each sample
Maximum 1 h
sampling interval
during the test:
Specimen Yes
optically
functioning:
– 12 – 61753-051-3 © IEC:2013
Table 1 (6 of 7)
No. Tests Requirements Details
13 Change of During the test the maximum Method: IEC 61300-2-22 (Test Nb): During the
temperature allowed change in insertion loss test the change in insertion loss shall
is: be measured by test method
≤ 0,5 dB for attenuator ≤ 5 dB IEC 61300-3-3

≤ 10 % for attenuators > 5 dB
High temperature: +70 °C ± 2 °C
Before and after the test the
insertion loss requirements of
Low temperature:
–25 °C ± 2 °C
test No 1 shall be met
Number of cycles: 12
Before and after the test the
return loss requirement of test
Rate of 1 °C/min
No 2 shall be met
temperature
change:
Duration at 1 h
extreme
temperatures:
Optical source
1 310 nm ± 10 nm
wavelength:
1 550 nm ± 10 nm
1 625 nm ± 10 nm
Test every sample with one
wavelength, changing wavelength for
each sample
Maximum 15 min
sampling interval
during the test:
Yes
Specimen
optically
functioning:
14 Dust Before and after the test the Method: IEC 61300-2-27
insertion loss shall meet the
requirements of test 1.
Temperature:
+35 °C ± 2 °C
Before and after the test the
Humidity:
+60 % RH ± 2 % RH
return loss shall meet the
requirements of test 2.
Dust type: Talc
Before and after the test.
Dust particle
< 150 µm
Specimen tested in mated
diameter:
position.
3 3
Dust
10,6 g/m ± 7,1 g/m
No significant difference either
concentration:
in the visual aspect or in the

strength coupling mechanism
Test duration: 10 min
shall be noticed
No
Specimen
optically
functioning:
15 Salt mist Before and after the test the Method: IEC 61300-2-2
insertion loss shall meet the
requirements of test 1.
Temperature: +35 °C ± 2 °C
Salt solution
5 % ± 1 %
Before and after the test the
(NaCl)
return loss shall meet the
concentration:
requirements of test 2.
pH Between 6,5 and 7,2
Before and after the test
Test duration: 96 h
specimen tested in mated
position
Specimen No
optically
functioning:
61753-051-3 © IEC:2013 – 13 –
Table 1 (7of 7)
No. Tests Requirements Details
16 Shock Before and after the test the Method: IEC 61300-2-9
insertion loss shall meet the
requirements of test 1
Acceleration 500 g
force:
Before and after the test the
return loss shall meet the
Time: 1ms duration, half sine pulse
requirements of test 2
No. of shocks: 3 axes in 2 directions, 2 shocks per
Before and after the test
axis, 12 shocks total
specimen tested in mated
position
Specimen No
optically
functioning:
a
Reference connector and adaptor definition is given in Annex A.
b
Clean connectors, plugs and adaptors according to manufacturer's instructions, prior to every mating, in all tests
unless otherwise specified.
– 14 – 61753-051-3 © IEC:2013
Annex A
(normative)
Reference connector and adaptor

Table A.1 gives reference connector and adaptor references.
Table A.1 – Requirements for reference connector and adaptor
Ferrule outer diameter 2,499 mm ± 0,000 5 mm 1,249 mm ± 0,000 5 mm
Eccentricity of fibre core centre to ferrule centre
≤ 0,3 µm ≤ 0,3 µm
Deviation of axis of fibre to axis of ferrule ≤ 0,2° ≤ 0,2°
Eccentricity of spherically polished ferrule
≤ 50 µm ≤ 50 µm
endface
Visual examination of fibre end surface with x200 No defects in core zone No defects in core zone
magnification
Insertion loss between two reference plugs ≤ 0,2 dB ≤ 0,2 dB
Visual examination Every 50 mating Every 50 mating

Reference adaptors should give 0,2 dB maximum insertion loss when used with two reference
plugs.
61753-051-3 © IEC:2013 – 15 –
Annex B
(normative)
Sample size and product sourcing requirements

Table B.1 gives sample size and product sourcing requirements.
Table B.1 − Sample size and product sourcing requirements
No. Test Sample size Source
N/A Dimensional 10 New
1 Insertio
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