SIST EN 62496-4:2011

SLOVENSKI STANDARD
SIST EN 62496-4:2011
01-maj-2011
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Optical circuit boards - Part 4: Interface standards - General and guidance (IEC 62496-
4:2011)
Optische Leiterplatten - Teil 4: Schnittstellennormen - Allgemeines und Leitfaden (IEC
62496-4:2011)
Cartes à circuits optiques - Partie 4: Normes d'interface - Généralités et lignes directrices
(CEI 62496-4:2011)
Ta slovenski standard je istoveten z: EN 62496-4:2011
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 62496-4:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 62496-4:2011

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SIST EN 62496-4:2011

EUROPEAN STANDARD
EN 62496-4

NORME EUROPÉENNE
March 2011
EUROPÄISCHE NORM

ICS 33.180.01


English version


Optical circuit boards -
Part 4: Interface standards -
General and guidance
(IEC 62496-4:2011)


Cartes à circuits optiques -  Optische Leiterplatten -
Partie 4: Normes d'interface - Teil 4: Schnittstellennormen -
Généralités et lignes directrices Allgemeines und Leitfaden
(CEI 62496-4:2011) (IEC 62496-4:2011)




This European Standard was approved by CENELEC on 2011-03-02. 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 62496-4:2011 E

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SIST EN 62496-4:2011
EN 62496-4:2011 - 2 -
Foreword
The text of document 86/379/FDIS, future edition 1 of IEC 62496-4, prepared by IEC TC 86, Fibre optics,
was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 62496-4 on
2011-03-02.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2011-12-02
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2014-03-02
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62496-4:2011 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 60027 series NOTE  Harmonized in EN 60027 series (not modified).
IEC 60695-11-5 NOTE  Harmonized as EN 60695-11-5.
IEC 60825-1 NOTE  Harmonized as EN 60825-1.
IEC 60825-2 NOTE  Harmonized as EN 60825-2.
IEC 61300 series NOTE  Harmonized in EN 61300 series (not modified).
ISO 286-1 NOTE  Harmonized as EN ISO 286-1.
ISO 1101 NOTE  Harmonized as EN ISO 1101.
ISO 7083 NOTE  Harmonized as EN ISO 7083.
__________

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SIST EN 62496-4:2011
- 3 - EN 62496-4:2011

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 60793-1-45 - Optical fibres - EN 60793-1-45 -
(mod) Part 1-45: Measurement methods and test
procedures - Mode field diameter

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SIST EN 62496-4:2011

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SIST EN 62496-4:2011

IEC 62496-4
®

Edition 1.0 2011-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside


Optical circuit boards –
Part 4: Interface standards – General and guidance

Cartes à circuits optiques –
Partie 4: Normes d'interface – Généralités et lignes directrices

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX U
ICS 33.180.01 ISBN 978-2-88912-317-9
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 62496-4:2011
– 2 – 62496-4  IEC:2011
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
3.1 General definitions . 6
3.2 Core shape definitions . 7
4 Coordinates of I/O ports of waveguide OCB . 9
4.1 Structural types of waveguide OCB . 9
4.2 Origin point and coordinate axis . 11
4.2.1 General . 11
4.2.2 Origin point and coordinate axis by internal coordinate . 12
4.2.3 Origin point and axis by external coordinate . 14
4.2.4 Origin point and axis employing both internal and external
coordinates. 15
5 Misalignment angle of I/O ports . 16
5.1 General . 16
5.2 Misalignment angle of I/O port in edge type . 16
5.3 Misalignment angle in surface type I/O port . 18
6 Mirror angle . 19
7 Hole . 21
8 Dimensioning system . 22
9 Gauges . 22
10 Tolerance grade of the OCB . 22
10.1 General . 22
10.2 Shape accuracy of the OCB body of fibre flexible OCB . 23
10.3 Position accuracy of the OCB port/I/O port of fibre flexible OCB . 23
10.4 Length accuracy of the OCB tails of fibre flexible OCB . 24
Annex A (normative) OCB interfaces . 25
Annex B (informative) Example of the OCB . 28
Bibliography . 30

Figure 1 – Examples of shapes of square core (quasi-square made by extrapolation or

interpolation) . 8
Figure 2 – Examples of shapes of circular core . 8
Figure 3 – Six structural parameters of square core shape of waveguide OCB . 9
Figure 4 – Example of OCB with end face I/O ports at edge of board . 10
Figure 5 – Example of OCB with end face I/O type. 10
Figure 6 – Example of OCB with surface I/O ports . 11
Figure 7 – Example of OCB with surface I/O ports . 11
Figure 8 – Definition of origin point 1): A specific port is used as the origin point . 12
Figure 9 – Definition of origin point 2): Determination of an origin point at a place
where there is no port (a mid-point of adjacent two ports at the centre of bottom line is
used as the origin) . 13

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SIST EN 62496-4:2011
62496-4  IEC:2011 – 3 –
Figure 10 – Definition of the direction of coordinate axis 1): Use the direction of
alignment of multiple ports . 13
Figure 11 – Definition of direction of coordinate axis 2): Along a specific optical circuit
(only if the wire is recognizable). 13
Figure 12 – Origin point and coordinate axis (1) . 14
Figure 13 – Origin point and coordinate axis (2) . 14
Figure 14 – Origin point and direction of coordinate axis (combination of Figure 12 and
Figure 13) . 15
Figure 15 – Use of both internal coordinate and external coordinate systems: Internal
for the origin point (a specific optical input/output port) and external for the direction of
the axis (dedicated structures) . 15
Figure 16 – Use of both internal coordinate and external coordinate systems: Internal
for the origin point (coordinates of a specific optical input/output port) and external for
the direction of the axis (periphery of the board) . 16
Figure 17 – Definition of misalignment angle of I/O port in edge type . 17
Figure 18 – Definition of vertical and horizontal rotational misalignment angle of I/O
port in edge type . 17
Figure 19 – Definition of misalignment angle of I/O port in surface type . 18
Figure 20 – Definition of longitudinal and lateral misalignment angle of I/O port in
surface type . 19
Figure 21 – Mirror angle 1 . 19
Figure 22 – Mirror angle 2 . 19
Figure 23 – Mirror angle 3 . 20
Figure 24 – Mirror angle 4 . 20
Figure 25 – Mirror tilt angle . 21
Figure 26 – Example of optical alignment hole . 21
Figure 27 – Hole and objects to be measured . 22
Figure 28 – Classification of shape accuracy of OCB body of fibre flexible OCB . 23
Figure B.1 – Example of the fibre flexible OCB . 28
Figure B.2 – Origin point and coordinate for the fibre flexible OCB . 29

Table 1 – The coordinate system, origin point and coordinate axis . 12

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SIST EN 62496-4:2011
– 4 – 62496-4  IEC:2011
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

OPTICAL CIRCUIT BOARDS –

Part 4: Interface standards –
General and guidance


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 62496-1 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
86/379/FDIS 86/386/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.

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SIST EN 62496-4:2011
62496-4  IEC:2011 – 5 –
A list of all the parts in the IEC 62496 series, under the general title Optical circuit boards,
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.

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SIST EN 62496-4:2011
– 6 – 62496-4  IEC:2011
OPTICAL CIRCUIT BOARDS –

Part 4: Interface standards –
General and guidance



1 Scope
This part of IEC 62496 covers general information on the subject of Optical Circuit Board
(OCB) interfaces. It includes normative references, definitions and rules for creating and
interpreting the standard drawings.
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 60793-1-45, Optical fibres – Part 1-45: Measurement methods and test procedures –
Mode field diameter
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 General definitions
3.1.1
OCB interface
sizes and relative locations for the features comprising the OCB. It also includes the location
of the coordinates of the alignment mark
3.1.2
OCB body
portion of an OCB where optical fibres/waveguides are fixed/fabricated to form an optical
routing pattern. The typical shape of an OCB body is rectangular
3.1.3
shape of the OCB body
outline of the OCB body which consists of a straight line and a curved line
NOTE The straight line is defined by coordinates of start point and end point, and the curved line is defined by the
coordinates of the start and the end points of the curve and by radius of curvature.
3.1.4
OCB tail
(OCB leg)
projection from the OCB body for interconnection with optical fibre cables and/or optical
components
3.1.5
length of the OCB tail
distance between the edge of an OCB body and the end of the OCB tail protruding from the
edge of the OCB body

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SIST EN 62496-4:2011
62496-4  IEC:2011 – 7 –
NOTE If the OCB tail has a mark in the vicinity of its end, the OCB tail length is the distance between the mark
and the end of the OCB body.
3.1.6
OCB port
position on the edge of the OCB body where OCB tails protrude from the OCB body
NOTE Relative positional accuracy between the OCB port and alignment mark or origin point is important for
connection with other boards or devices. The OCB port is defined only for the fibre flexible OCB.
3.1.7
position of the OCB port
coordinates at the intersectional point of the central axis of the optical fibre and the edge of
the OCB body
NOTE The coordinates of the OCB port consisting of closely arrayed fibres shall be defined by the coordinates of
the OCB port closest to the origin point.
EXAMPLE In a case where the OCB body of the fibre flexible OCB is put in the first quadrant and an outline or an
angle of the OCB is in contact with the X-axis or the Y-axis, as shown in Figure B.2 of Annex B, the coordinates of
origin are defined as the origin point of the fibre flexible OCB. It is recommended to set one side of the OCB body
parallel to the X-axis or the Y-axis. In another case where the alignment mark for assembly of optical components
on the OCB is located near the I/O ports, the centre of the alignment mark is defined as the origin point of the OCB.
3.1.8
I/O port
window in the OCB through which optical energy enters and/or exits
NOTE The I/O port is located at the end of the OCB tail, at the edge of the OCB body or at the surface of the OCB
where the OCB is connected to optical fibre cables and/or optical components.
3.1.9
alignment mark for assembly of OCB
mark on the OCB body, typically a through hole in the OCB body, for assembly of the OCB to
another board and/or equipment
NOTE The coordinates of the alignment mark are defined by the coordinates at the centre of the mark. The
alignment mark is used instead of a datum target in Annex A.
3.2 Core shape definitions
There are two types of core shape, square or circular, for waveguide OCBs
EXAMPLE 1 Square shape consists of four corners formed by extrapolating or interpolating an arbitrary shape by
four straight lines, as shown in Figure 1.

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SIST EN 62496-4:2011
– 8 – 62496-4  IEC:2011
Typical core Typical core Typical core Typical core
Typical core
cross-section (2) cross-section (3) cross-section (4) cross-section (5)
cross-section (1)
Typical core Typical core
Typical core Typical core Typical core
shape (4) shape (5)
shape (1) shape (2) shape (3)

IEC  018/11

Figure 1 – Examples of shapes of square core
(quasi-square made by extrapolation or interpolation)
EXAMPLE 2 Circular shape has round boundaries. It is not necessarily perfectly circular and includes elliptical
shapes or any round shapes. Examples of circular shapes are shown in Figure 2.
Typical core
Typical core Typical core
cross-section (6)
cross-section (7) cross-section (8)

IEC  019/11
Figure 2 – Examples of shapes of circular core
The six structural parameters for the square core shape are shown in Figure 3. Structural
parameters for the circle core shape are defined by NFP (near field pattern) observation of a
cross section (see IEC 60793-1-45).
3.2.1
core width (top)
upper horizontal component of the core shape
3.2.2
core width (bottom)
lower horizontal component of the core shape
3.2.3
core height
distance between the lower and upper horizontal lines

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SIST EN 62496-4:2011
62496-4  IEC:2011 – 9 –
3.2.4
core centre
intersection point of two diagonal lines of a quadrangle consisting of four midpoints of four
lines of the core shape, as illustrated in Figure 3
NOTE This intersection point corresponds to the centre of gravity in a system of material points.
3.2.5
core inner diameter
diameter of an inscribing circle with its centre at the core centre
3.2.6
core outer diameter
twice the distance between the core centre and the farthest corner of the core shape
Core width (top)
Core
centre
Core
height
Core width (bottom)
Core width Core height and core centre
Circle
(Centre of circle is the core centre)
Core
centre
Core inner diameter
Inscribing
core
Core outer
diameter
core inner diameter Core outer diameter
IEC  020/11

Figure 3 – Six structural parameters of square core shape of waveguide OCB
4 Coordinates of I/O ports of waveguide OCB
4.1 Structural types of waveguide OCB
OCBs are divided into two types defined by the positions and orientations of their optical I/O
ports. According to one type, the input / output port is defined by the exposed cross-section of
a waveguide at an edge of the board (end face I/O type), as illustrated in Figure 4, or at an
edge of a hole formed inside the area of the board, as illustrated in Figure 5. According to
another type, the input / output port contains an optical path converter such as a mirror to
deflect optical signals out of or into the surface of the board (surface I/O type), as illustrated
in Figure 6. An optical path converter can also be defined by a waveguide, which is bent
towards the surface of the board, such that its cross-section is exposed on the surface of the

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SIST EN 62496-4:2011
– 10 – 62496-4  IEC:2011
board and thereby forms a surface I/O port, as illustrated in Figure 7. A board may contain
both types of I/O port. The coordinates of an end face I/O port, as illustrated in Figure 4, are
defined by the core centre as set out in 3.10.1.4. A surface I/O port is defined by the
projection of an optical path converter, such as a mirror, on the surface of the board, as
illustrated in Figure 6. The position of the I/O port in the axis orthogonal to the plane of the
board is defined at the surface of the board on which the projection appears. The coordinates
of the surface I/O port are defined by the centre of the projected area of the optical path
converter on the surface or the centre of the core of a bent waveguide exposed on the surface,
as set out in 3.10.1.4. Optical I/O ports on both types of OCB can be distributed in 2
dimensions across a plane shared by the I/O port cross-section, as shown in Figure 4 and
Figure 6.
I/O ports (end face of OCB)
I/O ports (end face of OCB) Optical circuit
(a) Side view (b) View from left side
Substrate
IEC  021/11

Figure 4 – Example of OCB with end face I/O ports at edge of board

(a) Bird’s eye view
Hole
I/O port
(b) Side view

IEC  022/11
Figure 5 – Example of OCB with end face I/O type

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SIST EN 62496-4:2011
62496-4  IEC:2011 – 11 –
(a) Top view
I/O port
I/O port
Optical circuit
Optical circuit layer
Mirror
Substrate
(b) Side view
IEC  023/11

Figure 6 – Example of OCB with surface I/O ports

(a) Top view
I/O port Optical circuit
Optical layer
Substrate
(b) Side view
Bent waveguide
IEC  024/11

Figure 7 – Example of OCB with surface I/O ports
4.2 Origin point and coordinate axis
4.2.1 General
It is necessary to clearly define the origin point and coordinate axis of a port for transfer of
coordinate data between optical Input/output ports. They are defined in the following way:
There are two reference systems, the internal reference system and external reference
system according to the definition of an origin point. The internal reference system is the
system with the origin point at a specific optical input/output port, or the system with the origin
point at the mid-point of two optical Input/output ports. There are cases for the external
reference system, one with an origin point of a dedicated structure such as a marker and the
other with an origin point of one point of an OCB such as an edge of the board. The
coordinate system, origin point and coordinate axis are summarized in Table 1.

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SIST EN 62496-4:2011
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Table 1 – The coordinate system, origin point and coordinate axis
Coordinate system Origin point Example of Axis Applicable to
Internal coordinate Specific I/O port Aligned direction of
system multiple I/O ports
End face I/O port type
A specific position on an Direction of aligned I/O
OCB ports in a specific
direction
A dedicated newly Use a dedi
...