SIST EN 62496-2-1:2011

Optical circuit boards - Part 2-1: Measurements - Optical attenuation and isolation (IEC 62496-2-1:2011)

IEC 62496-2-1 describes the various methods to measure the optical attenuation and isolation of optical circuit boards (OCBs).

Optische Leiterplatten - Teil 2-1: Messungen - Optische Dämpfung und Isolation (IEC 62496-2-1:2011)

Cartes à circuits optiques - Partie 2-1: Mesures - Affaiblissement et isolation optiques (CEI 62496-2-1:2011)

la CEI 62496-2-1:2011 décrit les différentes méthodes utilisées pour mesurer l'affaiblissement et l'isolation optiques des cartes à circuits optiques (OCB, Optical Circuit Boards).

Plošče z optičnimi vezji - 2-1. del: Meritve - Optično slabljenje in izolacija (IEC 62496-2-1:2011)

IEC 62496-2-1 opisuje različne metode za merjenje optičnega slabljenja in izolacije plošč z optičnimi vezji (OCB).

General Information

• Status: Published
• Publication Date: 12-Oct-2011
• ICS: 31.180 - Printed circuits and boards
• ICS: 33.180.01 - Fibre optic systems in general
• Technical Committee: iTEL - Communication cables
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 29-Sep-2011
• Due Date: 04-Dec-2011
• Completion Date: 13-Oct-2011
• Ref Project: EN 62496-2-1:2011 - Optical circuit boards - Part 2-1: Measurements - Optical attenuation and isolation

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 62496-2-1:2011
01-november-2011
3ORãþH]RSWLþQLPLYH]MLGHO0HULWYH2SWLþQRVODEOMHQMHLQL]RODFLMD,(&

Optical circuit boards - Part 2-1: Measurements - Optical attenuation and isolation (IEC
62496-2-1:2011)
Optische Leiterplatten - Teil 2-1: Messungen - Optische Dämpfung und Isolation (IEC
62496-2-1:2011)
Cartes à circuits optiques - Partie 2-1: Mesures - Affaiblissement et isolation optiques
(CEI 62496-2-1:2011)
Ta slovenski standard je istoveten z: EN 62496-2-1:2011
ICS:
31.180 7LVNDQDYH]MD7,9LQWLVNDQH Printed circuits and boards
SORãþH
33.180.01 6LVWHPL]RSWLþQLPLYODNQLQD Fibre optic systems in
VSORãQR general
SIST EN 62496-2-1:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 62496-2-1:2011

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SIST EN 62496-2-1:2011

EUROPEAN STANDARD
EN 62496-2-1
NORME EUROPÉENNE
September 2011
EUROPÄISCHE NORM

ICS 33.180.01


English version


Optical circuit boards -
Part 2-1: Measurements -
Optical attenuation and isolation
(IEC 62496-2-1:2011)


Cartes à circuits optiques - Optische Leiterplatten -
Partie 2-1: Mesures - Teil 2-1: Messungen -
Affaiblissement et isolation optiques Optische Dämpfung und Isolation
(CEI 62496-2-1:2011) (IEC 62496-2-1:2011)





This European Standard was approved by CENELEC on 2011-09-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 62496-2-1:2011 E

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SIST EN 62496-2-1:2011
EN 62496-2-1:2011 - 2 -

Foreword
The text of document (86/396/FDIS), future edition 1 of IEC 62496-2-1, prepared by IEC TC 86, "Fibre
optics" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
EN 62496-2-1:2011.

The following dates are fixed:
(dop) 2012-06-01
• latest date by which the document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2014-09-01

standards conflicting with the
document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent
rights.

Endorsement notice
The text of the International Standard IEC 62496-2-1:2011 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60793-1-1 NOTE  Harmonized as EN 60793-1-1.
IEC 60794-1-1 NOTE  Harmonized as EN 60794-1-1.
IEC 61280-4-1 NOTE  Harmonized as EN 61280-4-1.
IEC 61300-3-35 NOTE  Harmonized as EN 61300-3-35.

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SIST EN 62496-2-1:2011
- 3 - EN 62496-2-1:2011
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

IEC 60793-2-10 - Optical fibres - EN 60793-2-10 -
Part 2-10: Product specifications - Sectional
specification for category A1 multimode fibres


IEC 60793-2-50 - Optical fibres - EN 60793-2-50 -
Part 2-50: Product specifications - Sectional
specification for class B single-mode fibres


IEC 60825-1 - Safety of laser products - EN 60825-1 -
Part 1: Equipment classification and
requirements


IEC 61300-1 - Fibre optic interconnecting devices and EN 61300-1 -
passive components - Basic test and
measurement procedures -
Part 1: General and guidance


IEC 61300-3-1 2005 Fibre optic interconnecting devices and EN 61300-3-1 2005
passive components - Basic test and
measurement procedures -
Part 3-1: Examinations and measurements -
Visual examination


IEC 61300-3-4 - Fibre optic interconnecting devices and EN 61300-3-4 -
passive components - Basic test and
measurement procedures -
Part 3-4: Examinations and measurements -
Attenuation


IEC 62496-1 2008 Optical circuit boards - EN 62496-1 2009
Part 1: General


IEC 62614 - Fibre optics - Launch condition requirements EN 62614 -
for measuring multimode attenuation


ISO 3599 - Vernier callipers reading to 0,1 and 0,05 mm - -


ISO 6906 - Vernier callipers reading to 0,02 mm - -

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SIST EN 62496-2-1:2011

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SIST EN 62496-2-1:2011
IEC 62496-2-1
®

Edition 1.0 2011-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Optical circuit boards –
Part 2-1: Measurements – Optical attenuation and isolation

Cartes à circuits optiques –
Partie 2-1: Mesures – Affaiblissement et isolation optiques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX V
ICS 33.180.01 ISBN 978-2-88912-572-2

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 62496-2-1:2011
– 2 – 62496-2-1 © IEC:2011
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Precautions . 6
4 Apparatus . 7
4.1 Launch conditions and source (S) . 7
4.2 Power-meter (D) . 7
4.3 Optical fibre (OF) . 8
4.4 Mode filter (MF) . 8
4.5 Optical direction changing device (OD) . 9
4.6 Temporary joint (TJ) . 9
5 Procedure . 10
5.1 Pre-conditioning . 10
5.2 Visual inspection . 11
5.3 Connectivity inspection . 11
5.4 OCB configurations and measurement methods . 11
5.5 Attenuation measurement with a power-meter . 13
5.5.1 General . 13
5.5.2 Cut-back method . 13
5.5.3 Insertion method (A) . 15
5.5.4 Insertion method (B) . 23
5.6 Isolation measurement with a power-meter . 25
5.6.1 Insertion method (C) . 26
5.6.2 Insertion method (D) . 31
5.7 Mirror loss measurement . 32
6 Details to be specified . 33
Bibliography . 34

Figure 1 – Launch apparatus for butt-joint connection, (a) without OD, (b) with OD . 10
Figure 2 – Cut-back method – Configuration A . 14
Figure 3 – Cut-back method – Configuration B . 15
Figure 4 – Insertion method (A) – Configuration A . 16
Figure 5 – Insertion method (A), multi port sequential measurements – Configuration A . 17
Figure 6 – Insertion method (A) – Configuration B . 18
Figure 7 – Insertion method (A) – Configuration C-1 . 19
Figure 8 – Insertion method (A) – Configuration C-2 . 20
Figure 9 – Insertion method (A) – Configuration D . 21
Figure 10 – Insertion method (A) – Configuration E . 22
Figure 11 – Insertion method (A) – Configuration E . 23
Figure 12 – Insertion method (B) – Configuration A . 24
Figure 13 – Insertion method (B) – Configuration C-1 . 25
Figure 14 – Insertion method (C) – Configuration A . 26
Figure 15 – Insertion method (C) – Configuration B . 27
Figure 16 – Insertion method (C) – Configuration C-1 . 28

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SIST EN 62496-2-1:2011
62496-2-1 © IEC:2011 – 3 –
Figure 17 – Insertion method (C) – Configuration D . 29
Figure 18 – Insertion method (C) – Configuration E . 30
Figure 19 – Insertion method (C) – Configuration E . 31
Figure 20 – Insertion method (D) – Configuration A . 32
Figure 21 – Mirror loss measurement . 33

Table 1 – Preferred source and launch conditions . 7
Table 2 – Preferred launching and receiving fibres . 8
Table 3 – Measurement methods of attenuations . 11
Table 4 – Measurement methods of isolations . 12

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SIST EN 62496-2-1:2011
– 4 – 62496-2-1 © IEC:2011
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

OPTICAL CIRCUIT BOARDS –

Part 2-1: Measurements –
Optical attenuation and isolation


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.
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 62496-2-1 has been prepared by IEC technical committee 86:
Fibre optics.
The text of this standard is based on the following documents:
FDIS Report on voting
86/396/FDIS 86/401/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 parts of the IEC 62496 series, published under the general title Optical circuit
boards can be found on the IEC website.

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SIST EN 62496-2-1:2011
62496-2-1 © IEC:2011 – 5 –
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.

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SIST EN 62496-2-1:2011
– 6 – 62496-2-1 © IEC:2011
OPTICAL CIRCUIT BOARDS –

Part 2-1: Measurements –
Optical attenuation and isolation



1 Scope
IEC 62496-2-1 describes the various methods to measure the optical attenuation and isolation
of optical circuit boards (OCBs).
2 Normative references
The following referenced documents are indispensable for the application 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 60793-2-10, Optical fibres - Part 2-10: Product specifications - Sectional specification for
category A1 multimode fibres
IEC 60793-2-50, Optical fibres - Part 2-50: Product specifications - Sectional specification for
class B single-mode fibres
IEC 60825-1, Safety of laser products – Part 1: Equipment classification and requirements
IEC 61300-1, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 1: General and guidance
IEC 61300-3-1:2003, Fibre optic interconnecting devices and passive components – Basic
test and measurement procedures – Part 3-1: Examinations and measurements – Visual
examination
IEC 61300-3-4, Fibre optic interconnecting devices and passive components – Basic test and
measurement procedures – Part 3-4: Examinations and measurements – Attenuation
IEC 62496-1:2008, Optical circuit boards – Part 1: General
IEC 62614, Fibre optics – Launch condition requirements for measuring multimode
attenuation
ISO 3599, Vernier callipers reading to 0,1 and 0,05 mm
ISO 6906, Vernier callipers reading to 0,02 mm
3 Precautions
The requirements of IEC 60825-1 and the following test requirements shall be met.
The position of the fibres in the test should be fixed during the measurement to avoid changes
in attenuation caused by bending loss.

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SIST EN 62496-2-1:2011
62496-2-1 © IEC:2011 – 7 –
4 Apparatus
4.1 Launch conditions and source (S)
For multimode measurements, a restricted launch, not an overfilled launch, shall be used.
Encircled flux, which is given in IEC 62614, shall be available for the purposes of launching
fibre qualification in case of a 50 or 62,5 graded index launch fibre. The required launch
conditions can be achieved by including appropriate equipment inside the light source, or by
applying mode filters on or in series with the launch cord.
For single-mode measurements, the launch condition shall be in accordance with Annex B of
IEC 61300-1.
The source unit consists of an optical emitter, the associated drive electronics and fibre pigtail.
Preferred source and launch conditions are given in Table 1.
Table 1 – Preferred source and launch conditions
No. Type Centre Spectral Stability Output Launch Source
o
wavelength width at 23 C power conditions type
nm nm dB/h
Laser diode or
a

S1 Multimode 660 ± 30 ± 0,05 TBD
≥30
LED
Laser diode or
a
S2 Multimode ± 0,05 TBD
780 ± 30 ≥30
LED
Laser diode or
a
S3 Multimode IEC 62614
850 ± 30 ≥30 ± 0,05
LED
Laser diode or
a
S4 Multimode TBD
980 ± 30 ≥30 ± 0,05
LED
Laser diode or
a

S5 Multimode 1 300 ± 30 ≥30 ± 0,05 IEC 62614
LED
IEC 61300-1, Laser diode or
a

S6 Single-mode 1 310 ± 30 ≤10 ± 0,05
Annex B.2.2 LED
IEC 61300-1, Laser diode or
a

S7 Single-mode 1 550 ± 30 ≤10 ± 0,05
Annex B.2.2 LED
a
The source output power shall be ≥20 dB above the minimum measured power level.
NOTE 1 Due to their long coherence length, laser source units create a speckle pattern across the core of a
multimode fibre that is unstable and which may render difficult or impossible the task of creating case 2 launch
conditions in a multimode component. Consequently, for measuring multimode components, lasers, should be
avoided in favour of LEDs or other incoherent source units.
NOTE 2 For S5 and S6, where an LED is used, the spectral width is more typically ≤150 nm.
NOTE 3 It is recognized that new components may require the use of other source types such as tunable lasers.
It is therefore recommended in these cases that the preferred source characteristics be specified on the basis of
the component to be measured.

4.2 Power-meter (D)
The power-meter unit consists of an optical detector, the mechanism for connecting to it and
associated detection electronics. The connection between the detector and a receiving fibre
will either be with an adaptor that accepts a bare fibre or a connector plug of appropriate
design.
The measurement system shall be stable within specified limits over the period of time
required to measure an optical power. For measurements where the connection to the
detector must be broken between the measurement of the optical power, the measurement

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SIST EN 62496-2-1:2011
– 8 – 62496-2-1 © IEC:2011
repeatability shall be within 0,05 dB. A detector with a large sensitive area may be used to
achieve this requirement.
The precise characteristics of the detector shall be compatible with the measurement
requirements. The dynamic range of the power-meter shall be capable of measuring the
power level exiting from the OCB at the wavelength being measured. The preferred dynamic
range is from 40 dBm to -75 dBm.
4.3 Optical fibre (OF)
Optical fibres used for optical measurements shall meet the requirement of all categories of
class A fibres (multimode) given in IEC 60793-2-10, or class B fibres (single-mode) given in
IEC 60793-2-50. The preferred launching and receiving fibres are given in Table 2.
To measure an OCB consisting of a multimode waveguide, the launching fibre core diameter
should preferably be the same as the core inner diameter of the OCB or less, and the
numerical aperture (NA), which is the sine of the acceptance angle of a waveguide or fibre,
should be smaller than that of OCB. In this case, the most reproduceable attenuation value
could be obtained.
When using a launch fibre with a much smaller core diameter than that of the OCB, such as a
single-mode fibre, it is likely that a lower attenuation value will be obtained. The NA of a
single-mode fibre is much lower than the NA of the multimode OCB such that the launch beam
is less affected by the roughness of the core wall.
When measuring an OCB that employs optical fibre, a launching fibre shall be selected that
has the same geometrical and optical characteristics as that used in the OCB.
Table 2 – Preferred launching and receiving fibres
OCB medium Launching fibre Receiving fibre
Multimode fibre, 50 GI Multimode fibre, Multimode fibre with core diameter that
completely circumscribes the OCB output
or 62,5 GI Multimode fibre,
port, and with the same NA as the OCB
output port or more
Multimode waveguide or

Single-mode fibre
or
Direct detection by power-meter
Single-mode fibre, Single-mode fibre Multimode fibre,
Single-mode fibre
or
or
Single-mode waveguide
Direct detection by power-meter

4.4 Mode filter (MF)
The function of a mode filter is to eliminate measurement inaccuracies.
For single-mode measurements the mode filter shall include at least two metres of fibre with
two 50 mm-diameter loops.
Mode filters shall be placed between the source and the OCB and, where specified by the test
method, before the detector.

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SIST EN 62496-2-1:2011
62496-2-1 © IEC:2011 – 9 –
4.5 Optical direction changing device (OD)
An optical direction changing device (OD) is a device by which the direction of incident light is
changed by 90 °. It may, for example, be a bending fibre, a flexible film waveguide, a fibre
with a flat (45 °) angled or curved mirror, or a waveguide with a flat (45 °) angled or curved mirror.
4.6 Temporary joint (TJ)
This is a method, device or mechanical fixture for temporarily aligning two fibre ends, a fibre
end and a waveguide end, or a waveguide end and a detector to form a stable, reproducible
and low-loss joint. It is used when the OCB cannot be directly connected to the measurement
system with a standard connector. It may, for example, be a fusion splice, a mechanical splice
realised with a precision V-groove, a butt joint realised with a micromanipulator, or a spatial
coupling. The temporary joint shall be stable to within ± 10 % of the measurement accuracy
required in dB over the time taken to measure optical power P. A suitable refractive index
matching material may be used to improve the stability of the TJ.
For the butt joint, the alignment of the system shall be adequate to ensure the reproducibility
or launched power. Figure 1(a) shows an example of the launch apparatus. Launching and
receiving fibres are mounted on XYZ and θ θ θ translation stages (micromanipulators), and
x y z
the OCB shall be placed between these fibre ends. The refractive index matiching material is
used between the OCB and the fibres. The preferred resolutions of the micromanipulators
operated by stepping motors are ≤ 0,1 µm and ≤ 1,5 µm for the single mode and the
multimode measurements, respectively.
The input port of the OCB is connected to the fibre from the source (S), and the receiving fibre
to the detector (D) is positioned to the output port of the OCB. First, launching fibre position
shall be tuned to realize the minimum attenuation, i.e. maximize optical power captured by
receiving fibre. Then, receiving fibre position shall be tuned to realize the minimum
attenuation. After that, the launching and receiving fibre tuning shall be alternated until the
attenuation converges to the smallest value. A suitable refractive index matching material
filling the two gaps between the OCB and the two fibre ends may also improve the
measurement stability.
Alternatively, if it is not easy to detect the initial output power from the OCB by the receiving
fibre, the following method shall be used. The input port of the OCB is connected to the fibre
from the source, and then a large area detector is positioned over the output port. First
launching fibre position shall be tuned to realize the minimum attenuation, i.e. maximize
optical power captured by receiving detector. Then once launch fibre position is optimised,
replace detector at receiving end with receiving fibre, which is connected to detector, and tune
receiving fibre position until power captured by receiving fibre is maximized. After that, tune
the positions of the launching and receiving fibres in alternation until the attenuation
converges to the smallest value.
Figure 1(b) shows an example of the launch apparatus including an optical direction changing
device (OD). Launching and receiving fibres are joined to the ODs with 45 ° angled mirrors,
and are mounted on XYZ and θ θ θ translation stages (micromanipulators). The OCB shall be
x y z
placed perpendicular to the launching/receiving fibre directions. The input and output ports of
the OCB are connected to the 45 ° angled mirrors in OD. The launching and receiving fibre
tuning shall be performed in the same way as mentioned above.
NOTE Care should be taken in using the refractive index matching material. Residual matching material after the
measurement affects the performance of the following test. It also affects the reliability of the connecting part if the
measured OCB is connected with the fibre optic interconnecting device and so on. For the measurement of the
OCB with a 45 ° angled mirror, it is possible that the excess matching material attaches to the mirror surface. This
affects the performance of the measurement.

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SIST EN 62496-2-1:2011
– 10 – 62496-2-1 © IEC:2011
2
2
4
3
1
TJ TJ
5
×
×
S D
MF MF
6 7 6
IEC  1551/11
（a） without OD
S D
1 5
6
6
2 2
T
...