IEC 61753-057-2:2012

Fibre optic interconnecting devices and passive components - Performance standard - Part 057-2: Single mode fibre plug-receptacle style optical fuse for category C - Controlled environment

IEC 61753-057-2:2012 contains the minimum initial test and measurement requirements and severities which a fibre optical fuse satisfies in order to be categorised as meeting the requirements of single mode fibre plug-receptacle style optical fuse used in controlled environments. Optical performance specified in this document relate to plug-receptacle style configuration fuses only.
Keywords: initial test and measurement requirements, single mode fibre plug-receptacle style optical fuse

Dispositifs d'interconnexion et composants passifs fibroniques - Norme de qualité de fonctionnement - Partie 057-2: Fusible optique du type fiche-embase à fibre unimodale pour catégorie C - Environnement contrôlé

IEC 61753-057-2: 2012 contient les exigences et les sévérités initiales minimales d’essai et de mesure auxquelles un fusible optique est tenu de satisfaire pour entrer dans une catégorie satisfaisant aux exigences du fusible optique du type fiche-embase à fibre unimodale, utilisé dans des environnements contrôlés. La performance optique spécifiée dans le présent document concerne des fusibles ayant des configurations de type fiche-embase uniquement.
Mots clés : exigences mesure et initiale d’essai, fusible optique du type fiche-embase à fibre unimodale

General Information

• Status: Published
• Publication Date: 04-Dec-2012
• ICS: 33.180.20 - Fibre optic interconnecting devices
• Technical Committee: SC 86B - Fibre optic interconnecting devices and passive components
• Drafting Committee: WG 7 - TC 86/SC 86B/WG 7
• Current Stage: PPUB - Publication issued
• Start Date: 05-Dec-2012
• Completion Date: 31-Dec-2012

Overview

IEC 61753-057-2:2012 is an IEC performance standard that specifies the minimum initial test and measurement requirements and severities for single mode fibre plug‑receptacle style optical fuses intended for category C – controlled environments. The document defines the optical, environmental and mechanical tests needed to categorise a plug‑receptacle style optical fuse as compliant, and limits the scope to plug‑receptacle configurations only. The standard also addresses test sample sizing, reporting and required test evidence.

Key topics and technical requirements

• Scope and purpose: Establishes baseline verification for single‑mode optical fuses used to protect fibre links and equipment from optical overpower events.
• Optical behaviour: Describes the fuse function - a passive device that produces a controlled, permanent signal blocking at a predetermined power threshold; wavelength independent across the specified spectral range. The standard notes a maximum allowed input power (Pin max) beyond which the device may become dysfunctional (numerical values in Annex B).
• Test methods: All tests reference the IEC 61300 series (basic test and measurement procedures). Relevant test types include:
  • High optical power and transient loss
  • Mating durability and mechanical tensile strength
  • Vibration (sinusoidal) and shock
  • Temperature, damp heat and change of temperature endurance
  • Attenuation, return loss, polarization dependent loss and polarization mode dispersion measurements
• Sample selection and reporting: Sample sizes, sequencing and product sourcing requirements are defined (Annex A). Fully documented test reports and supporting evidence are required.
• Supportive annexes: Include threshold power tables (Annex B), reference connector/adaptor requirements (Annex C), testing procedures (Annex E) and examples of style configuration (Annex D).
• IP notice: The standard highlights potential patent claims (e.g., KiloLambda technologies) and advises users to consult patent databases.

Practical applications and users

Who benefits from IEC 61753-057-2:

• Manufacturers and design engineers of fibre optic protection devices - for product design, qualification and product specification.
• Test laboratories and quality assurance teams - to perform and document the required initial test and measurement requirements.
• System integrators, network operators and procurement specialists - to specify compliant optical fuses for links in controlled environment applications (laboratories, data centres, protected telecom rooms).
• Compliance and certification bodies - for validation of product conformance and technical due diligence.

Related standards

• IEC 61300 series (test & measurement procedures)
• IEC 60869‑1 (generic passive power control devices)
• IEC 61754 / IEC 61755 (connector interfaces)
• IEC 60793‑2‑50 (single‑mode fibre specifications)
• IEC/TR 62627‑02 (round robin results on plug style fixed attenuators)

This standard is essential when specifying or validating single mode fibre plug‑receptacle style optical fuse performance in controlled environments and ensures consistent, repeatable initial test and measurement requirements.

Standards Content (Sample)

IEC 61753-057-2 ®
Edition 1.0 2012-12
INTERNATIONAL
STANDARD
colour
inside
Fibre optic interconnecting devices and passive components – Performance
standard –
Part 057-2: Single mode fibre plug-receptacle style optical fuse for category C –
Controlled environment
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester.
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International Standards for all electrical, electronic and related technologies.

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IEC 61753-057-2 ®
Edition 1.0 2012-12
INTERNATIONAL
STANDARD
colour
inside
Fibre optic interconnecting devices and passive components – Performance

standard –
Part 057-2: Single mode fibre plug-receptacle style optical fuse for category C –

Controlled environment
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
T
ICS 33.180.20 ISBN 978-2-83220-514-3

– 2 – 61753-057-2 © IEC:2012(E)
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Tests . 7
4 Test reports . 8
5 Performance requirements . 8
5.1 Sample size, sequencing and grouping. 8
5.2 Dimensions . 8
5.3 Test details and requirements . 8
Annex A (normative) Sample size and product sourcing requirements . 16
Annex B (normative) Threshold powers for optical fuses . 17
Annex C (normative) Reference connector and adaptor . 18
Annex D (informative) Example of style configuration for optical fuse . 19
Annex E (normative) Testing of optical fuses . 20
Bibliography . 23

Figure D.1 – Optical fuse, plug-receptacle style configuration . 19
Figure E.1 – Test set-up schematics . 20
Figure E.2 – Example of power threshold and blocking attenuation at threshold
measurements for sample 1280A of an optical fuse . 21
Figure E.3 – Response time curve of an optical fuse . 21
Figure E.4 – Response time testing set-up . 22

Table 1 – Performance requirements for optical fuses . 8
Table A.1 – Sample size and product sourcing requirements . 16
Table B.1 – Powers for optical fuses, single-mode . 17
Table C.1 – Requirements for reference connector and adaptor . 18

61753-057-2 © IEC:2012(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
PERFORMANCE STANDARD –
Part 057-2: Single mode fibre plug-receptacle
style optical fuse for category C –
Controlled 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
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
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
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
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.
International Standard IEC 61753-057-2 has been prepared by subcommittee SC86B: Fibre
optic interconnecting devices and passive components, of IEC technical committee TC86:
Fibre optics.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/3501/FDIS 86B/3545/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.

– 4 – 61753-057-2 © IEC:2012(E)
A list of all 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.
A bilingual version of this publication may be issued at a later date.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
61753-057-2 © IEC:2012(E) – 5 –
INTRODUCTION
The International Electrotechnical Commission (IEC) draws attention to the fact that it is
claimed that compliance with this document may involve the use of a patent concerning
optical fuse.
IEC takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured the IEC that he/she is willing to negotiate licences
either free of charge or under reasonable and non-discriminatory terms and conditions with
applicants throughout the world. In this respect, the statement of the holder of this patent right
is registered with IEC. Information may be obtained from:
KiloLambda technologies, Ltd.
22a Wallenberg street,
Tel-Aviv 69719, Israel
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights other than those identified above. IEC shall not be held responsible for
identifying any or all such patent rights.
ISO (www.iso.org/patents) and IEC (http://patents.iec.ch) maintain on-line data bases of
patents relevant to their standards. Users are encouraged to consult the data bases for the
most up to date information concerning patents.
US patent US-7162,114 B2 "Optical Energy switching device and method", granted
January 9,2007.
Japan patent 4376632 "Optical Energy switching device and method", granted September 18,
The optical fuse is a passive device, designed to protect equipment and fibre cables from
damage due to optical overpower, spikes and surges. The optical fuse produces a controlled,
permanent, signal blocking at a predetermined power threshold in an optical fibre
transmission line. The optical fuse is wavelength independent over its entire specified spectral
range. IEC 60869-1 contains the generic information of the optical fuse. The optical fuse has
a maximum allowed power input Pin max that is allowed. Beyond this power it is dysfunctional
and can let light through. Numerical values for Pin max are given in Annex B.

– 6 – 61753-057-2 © IEC:2012(E)
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
PERFORMANCE STANDARD –
Part 057-2: Single mode fibre plug-receptacle
style optical fuse for category C –
Controlled environment
1 Scope
This part of IEC 61753 contains the minimum initial test and measurement requirements and
severities which a fibre optical fuse satisfies in order to be categorised as meeting the
requirements of single mode fibre plug-receptacle style optical fuse used in controlled
environments. Optical performance specified in this document relate to plug-receptacle style
configuration fuses 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 60869-1, Fibre optic interconnecting devices and passive components – Fibre optic
passive power control devices – Part 1: Generic specification
IEC 61300-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 1: General and guidance
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: Tests – 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 61300-2-14, 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
___________
To be published.
61753-057-2 © IEC:2012(E) – 7 –
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 61300-2-19, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 2-19: Tests – Damp heat (steady state)
IEC 61300-2-22, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 2-22: Tests – Change of temperature
IEC 61300-3-2, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-2: Examinations 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 measurements – 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 61300-3-32, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 3-32: Examinations and measurements – Polarization
mode dispersion measurement for passive optical components
IEC 61754 series, Fibre optic connector interfaces
IEC 61755 series, 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 Tests
All test methods are in accordance with the IEC 61300 series.
Some tests require the use of reference connector plugs and reference connector adaptors.
These are specified in Annex C. It is essential and recommended that all connector, plugs and
reference connector adaptors be inspected and cleaned if dirty and checked again, according
to manufacturers’ instructions, prior to every mating in all tests.
All tests are to be carried out to validate performance over the required operating wavelength
and power range. As a result, single or multiple spectral bands may be chosen for the
qualification in addition to threshold power.

– 8 – 61753-057-2 © IEC:2012(E)
4 Test reports
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
Sample sizes for the tests are defined in Annex A.
5.2 Dimensions
Dimensions of mechanical interface for mating, plug and receptacle size, shall comply with
IEC optical connector interface standard IEC 61754 series and IEC optical interface standard
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 specifies the optical, environment and mechanical performance requirements and
related test methods for optical fuses.
Compliance to this standard requires demonstration of the ability to meet the performance
requirement in Table 1.
Table 1 – Performance requirements for optical fuses (1 of 8)
No. Test Requirement Details
1 Insertion Operating wavelength Method: IEC 61300-3-7, Method B2.1, test sample
loss range: 1 520 nm to configuration according to IEC 61300-3-4
1 625 nm substitution method
Insertion loss ≤1,5 dB
Launch ≥ 2 m. Only the fundamental mode shall
patchcord length: propagate at the fuse interface and at the
Insertion loss is measured
detector.
with input power ≤ –5 dBm
Other This test shall be performed against a
1,2
requirements: reference plug and reference adaptor.
Launch The wavelength of the source shall be
conditions: longer than cut-off wavelength of the fibre.
Source power ≤ ± 0,05 dB over the measuring period or
stability:
at least 1 h
Wavelength 1 520 nm to 1 625 nm
range:
Total uncertainty ≤ ± 0,05 dB

61753-057-2 © IEC:2012(E) – 9 –
Table 1 (2 of 8)
No. Test Requirement Details
2 Return loss  Method: IEC 61300-3-6 (Against
2 reference plugs )
Below power ≥ 35 dB Grade T
measurement method 1,
threshold
OCWR for grades T,R, U
≥ 40 dB Grade R
IEC 61300-3-6 (Against
≥ 50 d
...

IEC 61753-057-2 ®
Edition 1.0 2012-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic interconnecting devices and passive components – Performance
standard –
Part 057-2: Single mode fibre plug-receptacle style optical fuse for category C –
Controlled environment
Dispositifs d’interconnexion et composants passifs fibroniques – Norme de
performance
Partie 057-2: Fusible optique du type fiche-embase à fibre unimodale pour
catégorie C – Environnement contrôlé

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IEC 61753-057-2 ®
Edition 1.0 2012-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Fibre optic interconnecting devices and passive components – Performance

standard –
Part 057-2: Single mode fibre plug-receptacle style optical fuse for category C –

Controlled environment
Dispositifs d’interconnexion et composants passifs fibroniques – Norme de

performance
Partie 057-2: Fusible optique du type fiche-embase à fibre unimodale pour

catégorie C – Environnement contrôlé

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.20 ISBN 978-2-8322-7222-0

– 2 – IEC 61753-057-2:2012 © IEC 2012
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Tests . 7
4 Test reports . 8
5 Performance requirements . 8
5.1 Sample size, sequencing and grouping. 8
5.2 Dimensions . 8
5.3 Test details and requirements . 8
Annex A (normative) Sample size and product sourcing requirements . 16
Annex B (normative) Threshold powers for optical fuses . 17
Annex C (normative) Reference connector and adaptor . 18
Annex D (informative) Example of style configuration for optical fuse . 19
Annex E (normative) Testing of optical fuses . 20
Bibliography . 23

Figure D.1 – Optical fuse, plug-receptacle style configuration . 19
Figure E.1 – Test set-up schematics . 20
Figure E.2 – Example of power threshold and blocking attenuation at threshold
measurements for sample 1280A of an optical fuse . 21
Figure E.3 – Response time curve of an optical fuse . 21
Figure E.4 – Response time testing set-up . 22

Table 1 – Performance requirements for optical fuses . 8
Table A.1 – Sample size and product sourcing requirements . 16
Table B.1 – Powers for optical fuses, single-mode . 17
Table C.1 – Requirements for reference connector and adaptor . 18

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
PERFORMANCE STANDARD –
Part 057-2: Single mode fibre plug-receptacle
style optical fuse for category C –
Controlled 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
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
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
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
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.
International Standard IEC 61753-057-2 has been prepared by subcommittee SC86B: Fibre
optic interconnecting devices and passive components, of IEC technical committee TC86:
Fibre optics.
This bilingual version (2019-07) corresponds to the monolingual English version, published in
2012-12.
The text of this standard is based on the following documents:
FDIS Report on voting
86B/3501/FDIS 86B/3545/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.

– 4 – IEC 61753-057-2:2012 © IEC 2012
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all 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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
INTRODUCTION
The International Electrotechnical Commission (IEC) draws attention to the fact that it is
claimed that compliance with this document may involve the use of a patent concerning
optical fuse.
IEC takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured the IEC that he/she is willing to negotiate licences
either free of charge or under reasonable and non-discriminatory terms and conditions with
applicants throughout the world. In this respect, the statement of the holder of this patent right
is registered with IEC. Information may be obtained from:
KiloLambda technologies, Ltd.
22a Wallenberg street,
Tel-Aviv 69719, Israel
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights other than those identified above. IEC shall not be held responsible for
identifying any or all such patent rights.
ISO (www.iso.org/patents) and IEC (http://patents.iec.ch) maintain on-line data bases of
patents relevant to their standards. Users are encouraged to consult the data bases for the
most up to date information concerning patents.
US patent US-7162,114 B2 "Optical Energy switching device and method", granted
January 9,2007.
Japan patent 4376632 "Optical Energy switching device and method", granted September 18,
The optical fuse is a passive device, designed to protect equipment and fibre cables from
damage due to optical overpower, spikes and surges. The optical fuse produces a controlled,
permanent, signal blocking at a predetermined power threshold in an optical fibre
transmission line. The optical fuse is wavelength independent over its entire specified spectral
range. IEC 60869-1 contains the generic information of the optical fuse. The optical fuse has
a maximum allowed power input Pin max that is allowed. Beyond this power it is dysfunctional
and can let light through. Numerical values for Pin max are given in Annex B.

– 6 – IEC 61753-057-2:2012 © IEC 2012
FIBRE OPTIC INTERCONNECTING DEVICES
AND PASSIVE COMPONENTS –
PERFORMANCE STANDARD –
Part 057-2: Single mode fibre plug-receptacle
style optical fuse for category C –
Controlled environment
1 Scope
This part of IEC 61753 contains the minimum initial test and measurement requirements and
severities which a fibre optical fuse satisfies in order to be categorised as meeting the
requirements of single mode fibre plug-receptacle style optical fuse used in controlled
environments. Optical performance specified in this document relate to plug-receptacle style
configuration fuses 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 60869-1, Fibre optic interconnecting devices and passive components – Fibre optic
passive power control devices – Part 1: Generic specification
IEC 61300-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 1: General and guidance
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: Tests – 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 61300-2-14, 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
___________
To be published.
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 61300-2-19, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 2-19: Tests – Damp heat (steady state)
IEC 61300-2-22, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 2-22: Tests – Change of temperature
IEC 61300-3-2, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-2: Examinations 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 measurements – 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 61300-3-32, Fibre optic interconnecting devices and passive components – Basic test
and measurement procedures – Part 3-32: Examinations and measurements – Polarization
mode dispersion measurement for passive optical components
IEC 61754 series, Fibre optic connector interfaces
IEC 61755 series, 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 Tests
All test methods are in accordance with the IEC 61300 series.
Some tests require the use of reference connector plugs and reference connector adaptors.
These are specified in Annex C. It is essential and recommended that all connector, plugs and
reference connector adaptors be inspected and cleaned if dirty and checked again, according
to manufacturers’ instructions, prior to every mating in all tests.
All tests are to be carried out to validate performance over the required operating wavelength
and power range. As a result, single or multiple spectral bands may be chosen for the
qualification in addition to threshold power.

– 8 – IEC 61753-057-2:2012 © IEC 2012
4 Test reports
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
Sample sizes for the tests are defined in Annex A.
5.2 Dimensions
Dimensions of mechanical interface for mating, plug and receptacle size, shall comply with
IEC optical connector interface standard IEC 61754 series and IEC optical interface standard
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 specifies the optical, environment and mechanical performance requirements and
related test methods for optical fuses.
Compliance to this standard requires demonstration of the ability to meet the performance
requirement in Table 1.
Table 1 – Performance requirements for optical fuses (1 of 8)
No. Test Requirement Details
1 Insertion Operating wavelength Method: IEC 61300-3-7, Method B2.1, test sample
loss range: 1 520 nm to configuration according to IEC 61300-3-4
1 625 nm substitution method
Insertion loss ≤1,5 dB Launch ≥ 2 m. Only the fundamental mode shall
patchcord length:
propagate at the fuse interface and at the
Insertion loss is measured
detector.
with input power ≤ –5 dBm
Other This test shall be performed against a
1,2
requirements: reference plug and reference adaptor.
Launch The wavelength of the source shall be
conditions: longer than cut-off wavelength of the fibre.
Source power
≤ ± 0,05 dB over the measuring period or
stability:
at least 1 h
Wavelength 1 520 nm to 1 625 nm
range:
Total uncertainty
≤ ± 0,05 dB
Table 1 (2 of 8)
No. Test Requirement Details
2 Return loss  Method: IEC 61300-3-6 (Against
2 reference plugs )
Below power ≥ 35 dB Grade T
measurement method 1,
threshold
OCWR for grades T,R, U
≥ 40 dB Grade R
IEC 61300-3-6 (Against
≥ 50 dB Grade U
2 reference plugs )
measurement method 1,
≥ 60 dB Grade V
OFDR for grade V
Return loss is measured with input
Optical source 1 520 nm and 1 625 nm
power ≤ –5 dBm
Wavelength:
Test every sample with
the two wavelengths.
Total ≤ ± 2 dB
uncertainty
3 Return loss ≥ 30 dB Method: IEC 61300-3-6 (Against
2 reference plugs )
Above power Return loss is measured with input
measurement method 1,
threshold, after
power ≤ –5 dBm
OCWR
fuse response
Optical source 1 520 nm and 1 625 nm

Wavelength:
Test every sample with
the two wavelengths.
Total ≤ ±2 dB
uncertainty
Polarization IEC 61300-3-2 , all
4 ≤ 0,2 dB Method:
Dependent Loss polarization method
Over the specified operating
Optical source
wavelength 1 550 nm ± 10 nm
Wavelength:
The samples shall be terminated onto
single-mode fibres as per Total
≤ ±0,05 dB over the
IEC 60793-2-50, Type B 1.1, in either uncertainty
dynamic range to be
coated fibres (primary and secondary)
measured
or reinforced cable format
5 Polarization mode Method: IEC 61300-3-32, MPS
≤ 0,2 ps (Max value)
dispersion method
Over the specified operating
wavelength range Optical source
1 550 nm ± 10 nm
Wavelength:
Detector
± 0,05 dB over the
linearity: dynamic range to be
measured
6 High optical The fuse will not change its insertion Method: IEC 61300-2-14
power and return loss up to power threshold
Optical source
1 550 nm ± 10 nm
Below power Before and after the test the Insertion Wavelength:
threshold loss shall meet the requirements of
Test power: 3 dB below power
test 1
threshold
Before and after the test the return
Test
loss shall meet the requirements of 25 °C ± 2 °C
temperature:
test 2
The insertion loss change during the Test duration: Duration of long-term test:
test shall be within ± 0,5 dB of the 96 h at test power
initial value.
– 10 – IEC 61753-057-2:2012 © IEC 2012
Table 1 (3 of 8)
No. Test Requirement Details
7 High optical The fuse will block the Method: IEC 61300-2-14
power power from power threshold
Optical source 1 550 nm ± 10 nm
to ≥ 30 dBm input power or
Above power
Wavelength:
higher value specified in
threshold
Annex B
Test power: 3 dB above power threshold
(Destructive
Before the test the Insertion
Test temperature: 25 °C ± 2 °C
test)
loss shall meet the
requirements of test 1
Test duration: Duration of long-term test: 96 h
at test power
After and during the test the
Insertion loss shall meet the
requirements of test 9
Before and after the test the
return loss shall meet the
requirements of test 2
8 Power The tolerance is ± 1 dB Method: See Annex E for detailed test
threshold description.
from the specified optical
fuse power threshold
(Destructive The test power input is 1 dB to
test) 3 dB above power threshold and
The fuse will meet the
power threshold the blocking attenuation is
requirements as specified measured accordingly.
when operated at the
Samples from every batch will be
3 specified temperatures
destructively tested, all will
comply.
Optical source 1 550 nm
Wavelength:
Test temperature:
10 °C ± 2 °C
25 °C ± 2 °C
60 °C ± 2 °C
9 Blocking Method: See Annex E for detailed test
> 30 dB
attenuation at description.
The fuse will meet the
threshold
requirement as specified, The test power input is 1 dB to
(destructive
3 dB above power threshold and
when operated at the
test)
the blocking attenuation is
3 specified temperatures for
measured accordingly.
the specified duration
Samples from every batch will be
destructively tested, all will
comply.
Optical source 1 550 nm
Wavelength:
Test duration: 96 h at test power
Test temperature: 10 °C ± 2 °C
25 °C ± 2 °C
60 °C ± 2 °C
Table 1 (4 of 8)
No. Test Requirement Details
10 Response time < 100 µs Method: See Annex E for detailed test
description.
The fuse will meet the
The test power input is 1 dB to
requirement as specified,
3 dB above power threshold and
when operated at the 3
specified temperatures the blocking attenuation is
measured accordingly.
Samples from every batch will be
destructively tested, all will
comply.
Optical source 1 550 nm
Wavelength:
Test temperature: 10 °C ± 2 °C
25 °C ± 2 °C
60 °C ± 2 °C
11 Damp heat By the end of the test the Method: IEC 61300-2-19
(steady state) insertion loss shall meet the
During the test the change in
requirements of test 1
Insertion loss shall be measured
By the end of the test the by test method IEC 61300-3-3.
return loss shall meet the
Pre conditioning Standard atmospheric conditions
requirements of test 2
procedure: as defined in IEC 61300-1 for
The insertion loss change
2 hours
during the test shall be
Temperature: + 40 ± 2 °C
within ± 0,5 dB of the initial
value. Insertion loss is
Relative Humidity: +2
93 % RH
measured with input power
−3
≤ –5 dBm
Duration of 96 h
exposure:
After the test the power
Specimen optically Yes
threshold shall meet the
functioning:
requirements of test 8
Optical source 1 550 nm
Wavelength:
Optical power: 3 dB lower than power threshold,
as defined in Annex B
Recovery Allow specimens to return to
procedure: standard atmospheric conditions
defined in IEC 61300-1 in 2 h.

– 12 – IEC 61753-057-2:2012 © IEC 2012
Table 1 (5 of 8)
No. Test Requirement Details
12 Change of By the end of the test the Method: IEC 61300-2-22
temperature Insertion loss shall meet the
During the test the change in
requirements of test 1
Insertion loss shall be measured
By the end of the test the by test method IEC 61300-3-3.
return loss shall meet the
Pre conditioning Standard atmospheric conditions
requirements of test 2
procedure: as defined in IEC 61300-1 for 2 h
The insertion loss change
High +60 ± 2 °C
during the test shall be within
Temperature:
± 0,5 dB of the initial value.
Insertion loss is measured
Low temperature: –10 ± 2 °C
with input power ≤ –5 dBm
Number of 5
After the test the power
cycles:
threshold shall meet the
requirements of test 8
Temperature rate 1 °C/min
of change:
Duration at 1 h
extreme
temperatures:
Specimen Yes
optically
functioning:
Optical source 1 550 nm
Wavelength:
3 dB lower than power threshold,
Optical power:
as defined in Annex B
Maximum 15 min
sampling interval
during the test:
Recovery Allow specimen to return to
procedure: standard atmospheric conditions
in IEC 61300-1 for in 2 h.
13 Dry heat-high By the end of the test the Method: IEC 61300-2-18
temperature insertion loss requirements of
During the test the change in
endurance test No. 1 shall be met
insertion loss shall be measured.
By the end of the test the By test method IEC 61300-3-3.
return loss requirement of test
Pre-conditioning Standard atmospheric conditions
No. 2 shall be met
procedure: as defined in IEC 61300-1 for 2 h
The insertion loss change
Specimen Yes
during the test shall be within
optically
± 0,5 dB of the initial value.
functioning:
Insertion loss is measured
with input power ≤ –5 dBm
Temperature:
+60 °C ± 2 °C
After the test the power
Duration of the 96 h
threshold shall meet the
exposure:
requirements of test 8
Optical source 1 550 nm
Wavelength:
Maximum 1 h
sampling interval
during the test:
Recovery Allow specimen to return to
procedure: standard atmospheric conditions
in IEC 61300-1 for in 2 h.
Table 1 (6 of 8)
No. Test Requirement Details
14 Cold By the end of the test the Method: IEC 61300-2-17
Insertion loss shall meet the
During the test the change in
requirements of test 1
Insertion loss shall be measured
By the end of the test the by test method IEC 61300-3-3.
return loss shall meet the
Pre-conditioning Standard atmospheric conditions
requirements of test 2
procedure: as defined in IEC 61300-1 for 2 h
The insertion loss change
Specimen Yes
during the test shall be within
optically
± 0,5 dB of the initial value.
functioning:
Insertion loss is measured
with input power ≤ –5 dBm
Temperature:
–10 °C ± 2 °C
After the test the power
Duration of the 96 h
threshold shall meet the
exposure:
requirements of test 8
Optical source 1 550 nm
Wavelength:
Optical power: 3 dB lower than power threshold,
as defined in Annex B
Maximum 1 h
sampling interval
during the test:
Recovery Allow specimen to return to
procedure: standard atmospheric conditions
in IEC 61300-1 for in 2 h.
Vibration After the test the insertion
15 Method: IEC 61300-2-1
(sinusoidal) loss shall meet the
During the test the change in
requirements of test 1
Insertion loss shall be measured
After the test the return loss by test method IEC 61300-3-3.
shall meet the requirements
Frequency 10 Hz to 55 Hz
of test 2
range:
The insertion loss change
Vibration 0,75 mm
between value before test and
amplitude:
value after test shall be within
± 0,5 dB of the initial value.
Number of 15
Insertion loss is measured
cycles:
with input power ≤ –5 dBm
Rate of change: 1 octave/min
After the test the power
threshold shall meet the
Number of axes: 3 orthogonal axes
requirements of test 8
Specimen No
optically
functioning:
Optical source 1 550 nm
Wavelength:
Optical power: 3 dB lower than power threshold,
as defined in Annex B
– 14 – IEC 61753-057-2:2012 © IEC 2012
Table 1 (7 of 8)
No. Test Requirement Details
16 Shock After the test the insertion Method: IEC 61300-2-9
loss shall meet the
Acceleration 500 g
requirements of test 1
force:
After the test the return loss
shall meet the requirements
Number of axes: 3 axes, 2 directions
of test 2
Number of 2 shocks per direction,
After the test the power
cycles: 12 shocks total
threshold shall meet the
requirements of test 8
Duration per Nominal 1 ms duration, half sine
axis: pulse
Before and after the test
specimen tested in mated
Measurements Before, after each axis, and after
position
required: the test
Specimen
No
optically
functioning:
Optical source 1 550 nm
Wavelength:
Optical power: 3 dB lower than power threshold,
as defined in Annex B
17 Strength of After the test the insertion Method: IEC 61300-2-6
coupling loss shall meet the
During the test the change
mechanism requirements of test 1
insertion loss shall be measured
After the test the return loss by transient loss test method

shall meet the requirements IEC 61300-3-28 (Transient loss).
of test 2
Magnitude of the 40 N, at a rate of 2 N/s
The insertion loss change
load:
during the test shall be within
Load application 0,2 m from the optical interface
± 0,5 dB of the initial value.
point:
Above measurements carried
out in power ≤ –5 dBm
Duration of the 120 s
load:
Specimen Yes
optically
functioning:
3 dB lower than power threshold,
Optical power:
as defined in Annex B
Optical source 1 550 nm
Wavelength:
Mating After the test the return loss
18 Method: IEC 61300-2-2
durability shall meet the requirements
Number of 200, all parts (connector fuse-
of test 2
mating cycles: adaptor-connector) shall be
The insertion loss change
demated and mated
during the test shall be within
± 0,5 dB of the initial value.
Specimen Yes
Above measurements carried
optically
out in power ≤ –5 dBm
functioning:
Return loss is measured with
Measurements Change in insertion loss shall be
input power ≤ –5 dBm
required: measured after every cycle;
Before and after the test the
insertion loss shall meet the
requirements of test 1.
Return loss shall be measured
before and after the test and
shall meet the requirements of
test 2.
Optical source 1 550 nm
Wavelength:
Table 1 (8 of 8)
No. Test Requirement Details
Other Preconditioning procedure: clean
specifications: plug 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.
Reference connector definition is given in Annex C.
Clean connectors, plugs and adaptors according to manufacturer's instructions, prior to every mating, in all
tests unless otherwise specified.

– 16 – IEC 61753-057-2:2012 © IEC 2012
Annex A
(normative)
Sample size and product sourcing requirements
Table A.1 gives sample size and product sourcing requirements.
Table A.1 – Sample size and product sourcing requirements
No. Test Sample size Source
N/A Dimensional 10 New
1 Insertion loss 80 New
2 Return loss below power threshold 80 Test 1
3 Return loss above power threshold 12 Test 8 or 9
4 Polarization dependent loss 4 Test 2
5 Polarization mode dispersion 4 Test 4
6 High optical power. Below power threshold 8 Test 5
7 High optical power. Above power threshold. (Destructive test) 4 Test 2
Power threshold (Destructive test)
8 12 Test 2
4 samples at each temperature
9 Blocking attenuation at threshold (Destructive test) 12 Test 2
10 Response time (Destructive test) 12 Test 2
11 Damp Heat (steady state) 4 Test 2
12 Change of temperature 4 Test 2
13 Dry heat 4 Test 2
14 Cold 4 Test 2
15 Vibration (sinusoidal) 4 Test 2
16 Shock 4 Test 2
17 Strength of coupling mechanism 4 Test 2
18 Mating durability 4 Test 2
NOTE Tests 5 to 18 may be performed in any order. Samples for tests 5 to 18 should be randomly selected
from the samples of tests 2 and 4. Some tests are destructive and the samples cannot be used for any further
testing. Tests 8 and 9 are performed on the same samples or on different samples.

Annex B
(normative)
Threshold powers for optical fuses
Table B.1 gives the powers for optical fuses, single-mode.
Table B.1 – Powers for optical fuses, single-mode
Power threshold Recommended power Maximum allowed
for normal CW work power input, P
in max
dBm dBm dBm
18 Up to 15 Up to 30
19 Up to 16 Up to 32
20 Up to 17 Up to 34
21 Up to 18 Up to 36
22 Up to 19 Up to 36
23 Up to 20 Up to 36
24 Up to 21 Up to 36
25 Up to 22 Up to 36
26 Up to 23 Up to 36
27 Up to 24 Up to 36
28 Up to 25 Up to 36
29 Up to 26 Up to 36
30 Up to 27 Up to 36
NOTE P of 36 dBm is the maximum allowed power input into an optical fuses having power threshold up to
in max
30 dBm. Beyond this power, P of 36 dBm, it is dysfunctional and can let light through.
in max
– 18 – IEC 61753-057-2:2012 © IEC 2012
Annex C
(normative)
Reference connector and adaptor
Table C.1 gives the requirements for the reference connector and the adaptor.
Table C.1 – Requirements for reference connector and adaptor
Items 2,5 mm diameter ferrule 1,25 mm diameter ferrule
PC connector PC connector
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 degree ≤ 0,2 degree
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
NOTE Reference adaptors should give 0,2 dB maximum insertion loss when used with two reference plugs.

Annex D
(informative)
Example of style configuration for optical fuse
The optical fuse, plug-receptacle style, configuration is given in Figure D.1.

Figure D.1 – Optical fuse, plug-receptacle style configuration

– 20 – IEC 61753-057-2:2012 © IEC 2012
Annex E
(normative)
Testing of optical fuses
E.1 Introductory remark
This annex describes the testing of optical fuse functionality and measurement of its
parameters. Testing of the following parameters, which do not appear in regular IEC
standards, is described:
• power threshold;
• blocking attenuation at threshold;
• response time.
The fuse is a safety device and only destructive testing can test its functionality; it is not
functional any more after exposure to powers over the threshold. The actual test requires high
power, and needs a dedicated test set up, designed for these measurements.
An example of a test carried out on an optical fuse will be followed according to this Annex,
where the optical fuse parameters are
– power threshold: (each fuse in the batch) 20 dBm ± 1 dB
– blocking attenuation at threshold > 30 dB
– response time: < 100 µs
E.2 Power threshold and blocking attenuation at threshold measurement
Measuring the threshold power is the first and most important functional test of the optical
fuse, calling to expose the rated, e.g. 20 dBm, optical fuse to slowly varying powers starting at
10 dBm and up to 36 dBm. The powers needed call for an oscillator (e.g. diode laser) followed
by fibre amplifiers.
Figure E.1 – Test set-up schematics
The power measured by the detector, as a function of input power, provides both the
threshold power as well as the blocking attenuation at the threshold of the DUT. The insertion
loss for low and high power is provided as well.
Figure E.2 shows a curve of the change of the IL against the Pin. The change of the IL that
occurs at threshold can be seen, the IL change from ~0 dB to > 50 dB, giving more than five
orders of magnitude "protection", or blocking attenuation at threshold, being > 30 dB needed
___________
This Annex will be deleted when an IEC standard for a test method for an optical fuse is published.

in this example. The values of the insertion loss before and after activation are part of the
collected results.
Figure E.2 – Example of power threshold and blocking attenuation
at threshold measurements for sample 1280A of an optical fuse
E.3 Response time measurement
The response time of the optical fuse is defined as the total time where the optical fuse output
power level is higher than the predetermined optical fuse power threshold by +1 dB. Here the
input pulse duration is 1 ms long, having rise time of ~10 µs and a steady state power of fuse
power threshold + 3 dB. Figure E.3 illustrates the parameters.
In this case, rise time is the elapsed time for input power to reach 90 % of its steady-state
value from the time it starts.

Figure E.3 – Response time curve of an optical fuse
Schematics of the test set-up and description are shown in Figure E.4.

– 22 – IEC 61753-057-2:2012 © IEC 2012

Figure E.4 – Response time testing set-up
A 1 550 nm wavelength laser provides the input signal, which is amplified and regenerated by
the optical pulse generator unit, controlled by a designated software program. Output power is
measured and presented graphically using an oscilloscope. Analysis of the data is carried out
using standard mathematical software.
Since the test is carried out at three different temperatures, the minimal specified temperature,
the maximal specified temperature and the average specified temperature of the optical fuse,
the DUT is placed in
...