Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 2-43: Tests - Screen testing of return loss of single-mode PC optical fibre connectors

IEC 61300-2-43:2022 is available as IEC 61300-2-43:2022 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 61300-2-43: 2022 aims at screening single-mode physical contact (PC) optical fibre connector plugs of an optical fibre patch cord or an optical fibre pigtail in terms of return loss, thus ensuring minimum return loss when the connector plugs are randomly mated with each other in the field. This document is intended to apply to cylindrical ferrule connector plugs. This third edition cancels and replaces the second edition published in 2014. This edition constitutes a technical revision. This edition includes the following significant technical change with respect to the previous edition: addition of Clause 3 containing terms, definitions, and abbreviated terms.

Dispositifs d'interconnexion et composants passifs fibroniques - Procédures fondamentales d'essais et de mesures - Partie 2-43: Essais - Sélection des connecteurs PC pour fibres optiques unimodales en fonction de leur affaiblissement de réflexion

IEC 61300-2-43:2022 est disponible sous forme de IEC 61300-2-43:2022 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 61300-2-43: 2022 a pour objet de procéder à une sélection des fiches de connexion pour fibres optiques unimodales à contact physique (PC, physical contact) montées sur un cordon de brassage à fibre optique ou une fibre optique amorce, en fonction de leur affaiblissement de réflexion, pour garantir ainsi un affaiblissement de réflexion minimal lorsque les fiches de connexion sont accouplées sans choix préalable dans le terrain. Le présent document est destiné à s’appliquer aux fiches de connexion équipées de férules cylindriques. Cette troisième édition annule et remplace la deuxième édition parue en 2014. Cette édition constitue une révision technique. La présente édition inclut la modification technique majeure suivante par rapport à l’édition précédente: ajout de l’Article 3 contenant les termes, définitions et abréviations.

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Status
Published
Publication Date
31-Aug-2022
Current Stage
PPUB - Publication issued
Completion Date
01-Sep-2022
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IEC 61300-2-43
Edition 3.0 2022-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures –
Part 2-43: Tests – Screen testing of return loss of single-mode PC optical fibre
connectors
Dispositifs d’interconnexion et composants passifs fibroniques – Procédures
fondamentales d’essais et de mesures –
Partie 2-43: Essais – Sélection des connecteurs PC pour fibres optiques
unimodales en fonction de leur affaiblissement de réflexion
IEC 61300-2-43:2022-09(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61300-2-43
Edition 3.0 2022-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures –
Part 2-43: Tests – Screen testing of return loss of single-mode PC optical fibre
connectors
Dispositifs d’interconnexion et composants passifs fibroniques – Procédures
fondamentales d’essais et de mesures –
Partie 2-43: Essais – Sélection des connecteurs PC pour fibres optiques
unimodales en fonction de leur affaiblissement de réflexion
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.20 ISBN 978-2-8322-5593-3

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61300-2-43:2022 © IEC 2022
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 5

3 Terms, definitions, and abbreviated terms ....................................................................... 5

3.1 Terms and definitions .............................................................................................. 5

3.2 Abbreviated terms ................................................................................................... 5

4 General description ......................................................................................................... 6

5 Apparatus ........................................................................................................................ 6

5.1 General ................................................................................................................... 6

5.2 Source (S) .............................................................................................................. 6

5.3 Detector (D) ............................................................................................................ 6

5.4 Temporary joint (TJ) ............................................................................................... 6

5.5 Termination (T) ....................................................................................................... 6

5.6 Branching device (BD) ............................................................................................ 7

5.7 Reflection standard plug (RSP) ............................................................................... 7

5.8 Reflection standard cord (RSC)............................................................................... 7

6 Procedure ........................................................................................................................ 7

6.1 Selection of the RSC ............................................................................................... 7

6.2 Patch cord screen testing........................................................................................ 8

6.3 Pigtail screen testing............................................................................................... 8

7 Details to be specified and reported................................................................................. 8

Annex A (informative) Screen testing of return loss of pigtails having PC fibre optic

connector .............................................................................................................................. 10

Bibliography .......................................................................................................................... 16

Figure 1 – Measurement set-up for open plug reflection standard ........................................... 7

Figure 2 – Measurement set-up for mated RSCs ..................................................................... 8

Figure 3 – Measurement set-up for patch cord screen testing ................................................. 8

Figure 4 – Measurement set-up for pigtail screen testing ........................................................ 8

Figure A.1 – Measurement set-up of the screen test method ................................................. 11

Figure A.2 – Relationship between β and α ........................................................................... 13

Figure A.3 – Cumulative probability of return loss before test ................................................ 13

Figure A.4 – Cumulative probability of return loss after test .................................................. 14

Figure A.5 – Relationship between power and α .................................................................... 15

Figure A.6 – Measurement set-up of the reflected powers ..................................................... 15

---------------------- Page: 4 ----------------------
IEC 61300-2-43:2022 © IEC 2022 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –
Part 2-43: Tests – Screen testing of return loss of
single-mode PC optical fibre connectors
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

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Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

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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.

IEC 61300-2-43 has been prepared by subcommittee 86B: Fibre optic interconnecting devices

and passive components, of IEC technical committee 86: Fibre optics. It is an International

Standard.

This third edition cancels and replaces the second edition published in 2014. This edition

constitutes a technical revision.

This edition includes the following significant technical change with respect to the previous

edition: addition of Clause 3 containing terms, definitions, and abbreviated terms.

---------------------- Page: 5 ----------------------
– 4 – IEC 61300-2-43:2022 © IEC 2022
The text of this International Standard is based on the following documents:
Draft Report on voting
86B/4628/FDIS 86B/4652/RVD

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.

A list of all parts in the IEC 61300 series, published under the general title, Fibre optic

interconnecting devices and passive components – Basic test and measurement procedures,

can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under webstore.iec.ch in the data related to the

specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 6 ----------------------
IEC 61300-2-43:2022 © IEC 2022 – 5 –
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
BASIC TEST AND MEASUREMENT PROCEDURES –
Part 2-43: Tests – Screen testing of return loss of
single-mode PC optical fibre connectors
1 Scope

This part of IEC 61300 aims at screening single-mode physical contact (PC) optical fibre

connector plugs of an optical fibre patch cord or an optical fibre pigtail in terms of return loss,

thus ensuring minimum return loss when the connector plugs are randomly mated with each

other in the field. This document is intended to apply to cylindrical ferrule connector plugs.

2 Normative references

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.

IEC 61300-3-6, Fibre optic interconnecting devices and passive components – Basic test and

measurement procedures – Part 3-6: Examinations and measurements – Return loss
3 Terms, definitions, and abbreviated terms
3.1 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminological databased for use in standardization at the following

addresses:
• ISO Online browsing platform: available at https://www.iso.org/obp
• IEC Electropedia: available at http://www.electropedia.org/
3.2 Abbreviated terms
BD branching device
D detector
DUT device under test
PC physical contact
PDL polarization dependent loss
RSC reflection standard cord
RSP reflection standard plug
S source
T termination
TJ temporary joint
---------------------- Page: 7 ----------------------
– 6 – IEC 61300-2-43:2022 © IEC 2022
4 General description

The domed ferrule end faces of PC connector plugs (not angled) are produced by a polishing

process. This polishing process results in a thin, damaged surface layer at the fibre end face

of the connector plug. In silica fibres, the refractive index of the damaged layer is slightly higher

than that of the original fibre. This high index layer generates optical reflection. When PC

connector plugs are mated, return loss occurs as a result of multiple reflections at the two high

index layers of the physically contacting fibre end faces. This phenomenon and its effect on

return loss is further explained in IEC 61755-2-1.

This test procedure ensures that a designed minimum return loss is achieved when PC

connector plugs are randomly mated. It screens patch cords or pigtails by using a pair of

reflection standard cords (RSCs). The reflection standard cord has a reflection standard plug

(RSP) at one end. The pair of RSCs are selected on the condition that the return loss when the

plugs are mated is several decibels higher than the designed minimum return loss. Patch cords

which pass this test achieves the designed minimum return loss in over 99 % of cases when

randomly mated (see Annex A).
5 Apparatus
5.1 General

The equipment used shall be chosen according to the method used to measure the connector

return loss, in accordance with IEC 61300-3-6. For the sake of simplicity, the procedure and

figures in this document reflect that of a measurement with an optical continuous wave

reflectometer (OCWR). The procedure can be adapted to any of the other measurement

methods as deemed fit.
5.2 Source (S)

The source consists of an optical emitter, associated drive electronics, an excitation unit, and

a fibre connector or fibre pigtail.
5.3 Detector (D)

The detector used consists of an optical detector, the associated electronics, and a means of

connecting to an optical fibre. The optical connection may be a receptacle for an optical

connector plug, a fibre pigtail, or a bare fibre adapter.
5.4 Temporary joint (TJ)

A TJ is a joint that is made to connect the device under test (DUT) into the measurement circuit.

Examples of TJs are a connector, splice, vacuum chuck or micro-manipulator. The loss of the

TJ shall be stable, and the TJ shall have a return loss of at least 10 dB greater than the

maximum return loss to be measured.

Where a return loss greater than 50 dB is to be measured, a fusion splice is recommended in

order to guarantee the prescribed measurement uncertainty.
5.5 Termination (T)

Fibre terminations, T, shall have a high return loss. Three types of terminations are suggested:

– angled fibre ends: the value of the angle depends on the fibre type. A minimum angle of 12°

is necessary to achieve the desired high return loss;
– the application of an index matching material to the fibre end;
– attenuation in the fibre, for example, with a mandrel wrap.
---------------------- Page: 8 ----------------------
IEC 61300-2-43:2022 © IEC 2022 – 7 –

Where attenuation is used as a termination, it may be applied between components.

The fibre termination shall have a return loss of at least 20 dB greater than the maximum return

loss to be measured.

Where a return loss greater than 50 dB is to be measured, the "attenuation in the fibre"

termination technique is advised in order to guarantee the prescribed measurement uncertainty.

5.6 Branching device (BD)

The BD splits light power from the source to the signal and reference ports and couples light

power from those ports into the detector.

The splitting ratio of the BD shall be stable and be insensitive to polarization. The PDL is

recommended to be less than 0,1 dB. The directivity shall be at least 10 dB higher than the

maximum return loss to be measured.
5.7 Reflection standard plug (RSP)

The RSP is a plug connector whose return loss is better than the designed minimum return loss

RL (in decibels).
5.8 Reflection standard cord (RSC)

The RSC has a RSP at one end. The other end of the RSC is an end or a plug whose return

loss is better than the designed minimum return loss RL (in decibels).
6 Procedure
6.1 Selection of the RSC
The RSC shall be selected by the following procedure.
a) Set up an objective RSC as shown in Figure 1.
Figure 1 – Measurement set-up for open plug reflection standard

b) Set the detector to 14,7 dB as the Fresnel reflection between the air and the silica fibre core

as shown in Figure 1. The refractive index of air is 1,0, and the one of silica fibre is 1,452

for single-mode fibre on condition refractive index constant, Δ = 0,3 %, and wavelength,

λ = 1,31 µm.

NOTE Measurement uncertainty can be improved by using the actual parameters of fibres which have been

employed.

c) Connect another objective RSC as shown in Figure 2, then measure the return loss.

---------------------- Page: 9 ----------------------
– 8 – IEC 61300-2-43:2022 © IEC 2022
Figure 2 – Measurement set-up for mated RSCs

d) Take the pair of objective RSC’s as RSC’s on condition that their return loss from the mating

point is RL + β (in decibels), where RL is a designed minimum return loss. The value of β

rs rs
shall be set at above 2 dB.
6.2 Patch cord screen testing

Optical fibre patch cords shall be screen tested according to the following procedure.

a) Connect the device under test (DUT) (patch cord) between the RSPs as shown in Figure 3.

Figure 3 – Measurement set-up for patch cord screen testing
b) Measure the return loss RL (in decibels) from the two PC mating points.

c) Consider the objective patch cord as a screen tested patch cord when RL is greater than

RL .
6.3 Pigtail screen testing

Optical fibre pigtails shall be screen tested according to the following procedure.

a) Connect the objective PC connector of DUT (pigtail) to one RSP as shown in Figure 4, and

terminate the pigtail fibre end.
Figure 4 – Measurement set-up for pigtail screen testing
b) Measure the return loss RL (in decibels) from the mating point.

c) Pass the objective pigtail as a screen tested pigtail when RL is greater than RL + α (in

r rs
decibels). The value of α shall be set at above 0,6 dB and at less than 5 dB.
7 Details to be specified and reported

The following details, as applicable, shall be specified in the relevant specification and reported

in the test report:
– minimum return loss RL (in decibels);
– condition of RSPs (the value of β in decibels);
– screening condition for pigtail (the value of α in decibels);
---------------------- Page: 10 ----------------------
IEC 61300-2-43:2022 © IEC 2022 – 9 –

– attenuation of mating points between the RSPs and the objective connector plugs;

– attenuation and return loss of temporary joint;
– types of termination;
– return loss of termination;
– measurement uncertainty.
---------------------- Page: 11 ----------------------
– 10 – IEC 61300-2-43:2022 © IEC 2022
Annex A
(informative)
Screen testing of return loss of pigtails
having PC fibre optic connector

Annex A describes the theoretical background of the screen testing of return loss for pigtails.

The basic idea is the same as the screen testing of return loss of patch cords having PC fibre

optic connector plugs: select a pair of reference connectors, and a measurement pigtail is

screen tested using the reference connector under a condition which is determined by

simulation, where the distribution of high refractive index layer caused by polishing process is

considered.

Two parameters β and α are introduced into this method. Parameter β is used for the selection

of a pair of reference connectors. Parameter α is used as a criterion for screen testing

measurement connectors. These two parameters β and α are carefully determined by simulation

so that return loss of mating point exceeds certain specified return loss L with high probability

when the screen tested connectors are randomly connected.
The method assumes the following:
– refractive index of fibre core n is 1,452;
– refractive index of air n is 1,0.

The set-up of the measurement and test procedures will be shown first. Figure A.1 shows the

set-up with the reference patch cords 1 and 2; 1a and 2a represent reference connector plugs.

Points 3a and 3b are the connector plugs of the patch cord under test and 4a is the connector

plug of the pigtail under test. The connector plugs represented by 1b, 2b and 5b are angled

connectors with high return loss. S is the optical source; D is the optical detector and BD

represents the branching device. T is a fibre termination which has a high return loss; it should

be made by the application of an index matching material to the fibre end or introducing a

high attenuation in the fibre, for example, with a mandrel wrap.
---------------------- Page: 12 ----------------------
IEC 61300-2-43:2022 © IEC 2022 – 11 –
Key
P input power
P , P , P and P reflected power
1 2 3 8
①...④ connection conditions
and angled connections with high return loss
non-angled PC plugs
Figure A.1 – Measurement set-up of the screen test method
The procedure of the screen test method is as follows:
a) A pair of reference plugs is selected.

– Connect the connector 1b to the connector 5b, then measure the power P (see ① in

Figure A.1).

– Connect the reference connector 2a to the reference connector 1a, then measure the

power P (see ② in Figure A.1).
The condition of selection is given by:
RL < –10 log P /P ≤ RL + β (dB)
(A.1)
rs 1 0 rs
The measured power P can be described using P , n and n as follows:
0 8 1 2
–10 log 1/P = –10 log 1/P – 20 log (n – n ) / (n + n )
(A.2)
0 8 1 2 1 2
---------------------- Page: 13 ----------------------
– 12 – IEC 61300-2-43:2022 © IEC 2022

The second term of the right side represents Fresnel reflection of air and equals 14,7 dB.

Therefore, Formula (A.1) can be rewritten as:
0 < –10 log P /P + 14,7 – RL ≤ β
(A.3)
1 8 rs

b) The patch cord under test is screen tested using the pair of reference connectors.

– Connect the patch cord under test 3 between the reference connectors 1a and 2a, then

(see  Figure A.1).
measure the power P
The criteria for the screen test of the measurement connectors are given by:
–10 log P /P + 14,7 ≥ RL + α (dB)
(A.4)
2 8 rs

c) The pigtail under test is screen tested using one of the pair reference connectors.

– Remove the reference connector 2a from reference connector 1a.

– Connect measurement connector 4a to the reference connector 1a, then measure the

power P (see ④ in Figure A.1).
The criteria for the screen test of the measurement connectors is given by:
–10 log P /P + 14,7 ≥ RL + α (dB)
(A.5)
3 8 rs

The parameters β and α are determined by simulation so that the return loss of mating point

exceeds the specified return loss RL with high probability when the screen tested connectors

are randomly connected.

Figure A.2 shows the relation between β and α derived by the condition that the return loss at

the mating point exceeds a specified value RL with a probability of 99 %. The white circles

represent the simulation results for pigtails. The black circles represent those for patch cords.

The lines indicate first-order regression lines. Figure A.2 indicates that the return loss of

randomly concatenated patch cords exceeds RL (in decibels) with a probability of 99 % under

the condition of α ≥ 0,4β – 2,0. The parameters β and α are determined according to this

condition.
---------------------- Page: 14 ----------------------
IEC 61300-2-43:2022 © IEC 2022 – 13 –
Figure A.2 – Relationship between β and α

Figure A.3 shows the cumulative probability of return loss before screen testing. Figure A.4

shows the cumulative probability of return l
...

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