EN IEC 61300-3-30:2026
(Main)Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-30: Examinations and measurements - Endface geometry of rectangular ferrule
- Abstract
This part of IEC 61300 describes a method for measuring the endface geometry of rectangular multifibre ferrules having an IEC defined optical interface. The primary attributes are fibre position relative to the endface, endface angle relative to the guide holes, fibre tip radii and core dip for multimode fibres.
- Status
- Published
- Publication Date
- 10-Sep-2026
- Current Stage
- 6060 - Document made available - Publishing
- Start Date
- 11-Sep-2026
- Due Date
- 31-Dec-2026
- Completion Date
- 11-Sep-2026
EN IEC 61300-3-30:2026 is a CENELEC European Standard that adopts IEC 61300-3-30:2026 for fibre optic interconnecting devices and passive components. It specifies a three-dimensional interferometry-based method for measuring the endface geometry of rectangular multifibre ferrules, including fibre height, surface angles, tip radii, core dip and related geometry parameters. Engineers, test labs and quality teams use it to measure and report ferrule geometry in a consistent way.
What does EN IEC 61300-3-30:2026 specify?
EN IEC 61300-3-30:2026 specifies a test method for measuring the endface geometry of rectangular multifibre ferrules with an IEC defined optical interface. The document focuses on the geometry needed for physical contact between mated ferrules, especially fibre position relative to the endface, endface angle relative to the guide holes, fibre tip radii and core dip for multimode fibres.
The document is organized into clauses 1 to 8 and normative annexes A to F.
| Annex | What it covers |
|---|---|
| A | Formulae for approximating the endface geometry |
| B | Surface angle sign convention |
| C | Fibre counting convention |
| D | Minus coplanarity and fibre plane angle determination |
| E | Calculation of core dip using the paraboloid method |
| F | Calculation of GL parameter |
What are the key requirements of EN IEC 61300-3-30:2026?
EN IEC 61300-3-30:2026 is built around a defined measurement area, a specified interferometric setup and a fixed processing sequence. In practice, the standard tells users what to measure, how to process the surface data and what results to report.
Measurement regions and ferrule types
The standard defines four regions on the ferrule endface: the region of interest (ROI), the extracting region, the averaging region and the core dip region. Table 1 assigns the required measurement areas and parameters for ferrule variants such as MT-04, MT-08, MT-12, MT-16, MT-24, MT-32 and MiniMT.
That matters because the software must use the right regions for the specific ferrule type. If the wrong ROI or fitting region is used, the measured geometry can shift enough to affect pass or fail decisions.
Apparatus and measurement uncertainty
Clause 6 requires a ferrule holder, a positioning stage and a three-dimensional interferometry analyser with an interferometric video microscope, a PC-based fringe interpretation unit and a monitor. The analyser shall measure fibre heights within ±50 nm and core dips within ±20 nm.
The microscope, phase shift actuator and ferrule holder tilt angle shall be calibrated. In practice, this means the equipment has to be stable and traceable enough for small geometry differences to be measured reliably.
Surface processing sequence
Clause 7 sets out the measurement workflow. The surface is mapped, the fibre regions are removed, a bi-parabolic surface is fitted to the ferrule area, the highest 3 % of pixels are removed, and then the highest 20 % of the remaining pixels are used to fit the best-fit plane PJ.
From that plane, the standard calculates ferrule surface angles SX and SY, fibre heights H and adjacent fibre height differential HA. It then fits a bi-parabolic curve to obtain ferrule surface radii RX and RY.
In practice, this sequence filters out local peaks and adhesive effects so the software measures the ferrule geometry rather than random surface noise.
Multimode fibre core dip and fibre tip radius
For multimode fibres, Clause 7 requires core dip C to be calculated using the paraboloid method in Annex E. If C is greater than 10 nm, the value is reported and the fibre tip radius step is skipped for that fibre. If C is 10 nm or less, C is not reported for that fibre and the fibre tip radius RF is measured instead.
That distinction matters because the standard treats core dip and tip radius as alternative outcomes for some fibres, not as always-report-both quantities.
Minus coplanarity, fibre plane angles and GL
Annex D defines minus coplanarity CF and the fibre plane angles GX and GY. For single-row ferrules, the fibre ends are analysed as a line; for multi-row ferrules, they are analysed as a plane. The reference is the average of the guide hole axes.
Annex F defines the GL parameter, which is used to assess the acceptability of an endface geometry. The standard says GL is determined only when core dip has been reported for 50 % or fewer of the fibres, and it uses the median RF value of fibres with negative core dip.
That means GL is a conditional merit function, not a universal output for every measurement.
Reporting
Clause 8 requires the test report to identify the DUT characteristics, the measurement setup, the uncertainty and the final measured and calculated values. The report includes SX, SY, CF, GX, GY, RF, C, GL, RX, RY, H and HA, plus any deviations from the procedure.
What terms does EN IEC 61300-3-30:2026 define?
EN IEC 61300-3-30:2026 uses a small set of recurring terms that are central to the measurement method.
- Region of interest (ROI) - the rectangular ferrule area selected for endface analysis and centred on the fibre array.
- Extracting region - the circular area around each fibre that is removed before fitting the ferrule surface.
- Averaging region - the circular area on each fibre used to calculate fibre height and, when needed, fit the fibre tip sphere.
- Core dip - the difference in height between the fibre core and the surrounding cladding at the endface, used for multimode fibres.
- Minus coplanarity (CF) - the largest offset of a fibre end below the best-fit fibre line or plane.
- Geometry limit (GL) - a calculated merit function used to judge the acceptability of the endface geometry.
- Ferrule holder - the device that fixes the ferrule during interferometric measurement and sets its orientation.
Who uses EN IEC 61300-3-30:2026?
EN IEC 61300-3-30:2026 is used by manufacturers of fibre optic interconnecting devices and passive components, test laboratories, quality assurance teams and product engineers working with rectangular multifibre ferrules. It is also relevant to organizations qualifying MT and MPO-type connector interfaces, because the document refers to guide-pin based multifibre connector plugs in IEC 61754-5 and IEC 61754-7.
In practice, users apply it when they need to inspect ferrule polish quality, verify fibre protrusion and alignment, compare supplier results, or document geometry measurements for production control and incoming inspection.
What changed in EN IEC 61300-3-30:2026 from the previous edition?
EN IEC 61300-3-30:2026 supersedes EN IEC 61300-3-30:2021. The IEC foreword describes this edition as a technical revision of the earlier 2020 edition.
The stated changes are:
- clarification of region diameter symbols
- introduction of x116 and x132 regions of interest to support MT-16 and MT-32 ferrule types
- preparation of GL parameter tables for 16-, 24- and 32-fibre ferrules
- clarification of the neighbouring fibres definition when computing adjacent height
- improved figures in the annexes
Which standards are used with EN IEC 61300-3-30:2026?
EN IEC 61300-3-30:2026 states that it has no normative references, but its bibliography and endorsement notice point to related IEC standards used alongside it.
- IEC 61300 (all parts) - the series of basic test and measurement procedures for fibre optic interconnecting devices and passive components.
- IEC 61755-3-31:2015 - connector optical interfaces for non-dispersion shifted single mode physically contacting fibres in angled PPS rectangular ferrules.
- IEC 61755-3-32:2015 - connector optical interfaces for non-dispersion shifted single mode physically contacting fibres in angled thermoset epoxy rectangular ferrules.
- IEC PAS 63267-3-30:2021 - end face geometry for angled PC end face PPS rectangular ferrule multimode A1b fibres.
- IEC PAS 63267-3-31:2020 - end face geometry for flat PC PPS rectangular ferrule multimode fibres.
- IEC 61754-5:2005 - the Type MT connector family interface.
- IEC 61754-7 (all parts) - the Type MPO connector family interface.
What does the EN IEC 61300-3-30:2026 document contain?
EN IEC 61300-3-30:2026 contains the measurement regions, apparatus description, step-by-step procedure, reporting requirements and six normative annexes. It also includes figures for the measurement regions, test setup, sign conventions, fibre counting, minus coplanarity and core dip fitting.
The document provides:
- the ROI, extracting, averaging and core dip region definitions
- the interferometric measurement setup and calibration points
- the data-processing sequence for surface fitting and plane fitting
- the Annex A formulae for ferrule and fibre surface approximation
- the Annex D, E and F methods for minus coplanarity, core dip and GL
- Table 1 for ferrule measurement areas and Tables F.1 to F.3 for GL constants
In practice, this content is used for design verification, production inspection, test reporting and laboratory measurement software that analyses ferrule endface geometry.
Relations
- Effective Date
- 09-Apr-2024
- Effective Date
- 15-Sep-2026
- Effective Date
- 15-Sep-2026
- Effective Date
- 15-Sep-2026
- Effective Date
- 15-Sep-2026
- Effective Date
- 15-Sep-2026
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Frequently Asked Questions
EN IEC 61300-3-30:2026 is a standard published by CLC. Its full title is "Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-30: Examinations and measurements - Endface geometry of rectangular ferrule". This standard covers: This part of IEC 61300 describes a method for measuring the endface geometry of rectangular multifibre ferrules having an IEC defined optical interface. The primary attributes are fibre position relative to the endface, endface angle relative to the guide holes, fibre tip radii and core dip for multimode fibres.
This part of IEC 61300 describes a method for measuring the endface geometry of rectangular multifibre ferrules having an IEC defined optical interface. The primary attributes are fibre position relative to the endface, endface angle relative to the guide holes, fibre tip radii and core dip for multimode fibres.
EN IEC 61300-3-30:2026 is classified under the following ICS (International Classification for Standards) categories: 33.180.20 - Fibre optic interconnecting devices. The ICS classification helps identify the subject area and facilitates finding related standards.
EN IEC 61300-3-30:2026 has the following relationships with other standards: It is inter standard links to EN IEC 61300-3-30:2021, EN 50377-11-1:2008, EN 61755-3-31:2015, EN 61300-1:2016, EN 61755-3-32:2016, EN IEC 63267-3-81:2025. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN IEC 61300-3-30:2026 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2026
Nadomešča:
SIST EN IEC 61300-3-30:2021
Optični spojni elementi in pasivne komponente - Osnovni preskusni in merilni
postopki - 3-30. del: Preiskave in meritve - Geometrija čela pravokotnih tulcev (IEC
61300-3-30:2026)
Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures - Part 3-30: Examinations and measurements - Endface
geometry of rectangular ferrule (IEC 61300-3-30:2026)
Lichtwellenleiter - Verbindungselemente und passive Bauteile - Grundlegende Prüf- und
Messverfahren - Teil 3-30: Untersuchungen und Messungen - Endflächen-Geometrie
einer rechteckigen Ferrule (IEC 61300-3-30:2026)
Dispositifs d'interconnexion et composants passifs fibroniques - Procédures
fondamentales d'essais et de mesures - Partie 3-30: Examens et mesures - Géométrie
de la surface de terminaison de la ferrule rectangulaire (IEC 61300-3-30:2026)
Ta slovenski standard je istoveten z: EN IEC 61300-3-30:2026
ICS:
33.180.20 Povezovalne naprave za Fibre optic interconnecting
optična vlakna devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 61300-3-30
NORME EUROPÉENNE
EUROPÄISCHE NORM September 2026
ICS 33.180.20 Supersedes EN IEC 61300-3-30:2021
English Version
Fibre optic interconnecting devices and passive components -
Basic test and measurement procedures - Part 3-30:
Examinations and measurements - Endface geometry of
rectangular ferrule
(IEC 61300-3-30:2026)
Dispositifs d'interconnexion et composants passifs Lichtwellenleiter - Verbindungselemente und passive
fibroniques - Procédures fondamentales d'essais et de Bauteile - Grundlegende Prüf- und Messverfahren - Teil 3-
mesures - Partie 3-30: Examens et mesures - Géométrie de 30: Untersuchungen und Messungen - Endflächen-
la surface de terminaison de la férule rectangulaire Geometrie einer rechteckigen Ferrule
(IEC 61300-3-30:2026) (IEC 61300-3-30:2026)
This European Standard was approved by CENELEC on 2026-08-31. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre 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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61300-3-30:2026 E
European foreword
The text of document 86B/5224/FDIS, future edition 3 of IEC 61300-3-30, prepared by SC 86B "Fibre
optic interconnecting devices and passive components" of IEC/TC 86 "Fibre optics" was submitted to
the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 61300-3-30:2026.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2027-09-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-09-30
document have to be withdrawn
This document supersedes EN IEC 61300-3-30:2021 and all of its amendments and corrigenda (if
any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 61300-3-30:2026 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 standard indicated:
IEC 61300 (series) NOTE Approved as EN 61300 (series)
IEC 61755-3-31:2015 NOTE Approved as EN 61755-3-31:2015 (not modified)
IEC 61755-3-32:2015 NOTE Approved as EN 61755-3-32:2016 (not modified)
IEC 61754-5:2005 NOTE Approved as EN 61754-5:2005 (not modified)
IEC 61754-7 (series) NOTE Approved as EN IEC 61754-7 (series)
IEC 61300-3-30 ®
Edition 3.0 2026-07
INTERNATIONAL
STANDARD
Fibre optic interconnecting devices and passive components - Basic test and
measurement procedures -
Part 3-30: Examinations and measurements - Endface geometry of rectangular
ferrule
ICS 33.180.20 ISBN 978-2-8327-1373-0
IEC 61300-3-30:2026-07(en)
IEC 61300-3-30:2026 © IEC 2026
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General description . 5
5 Measurement regions . 6
6 Apparatus . 7
6.1 General . 7
6.2 Ferrule holder . 8
6.3 Positioning stage . 8
6.4 Three-dimensional interferometry analyser . 8
7 Procedure . 9
8 Details to be specified and reported . 11
Annex A (normative) Formulae for approximating the endface geometry . 12
A.1 Approximation of the ferrule surface . 12
A.2 Approximation of the fibre tip radii . 12
Annex B (normative) Surface angle sign convention (shown graphically) . 13
Annex C (normative) Fibre counting convention (shown graphically) . 14
Annex D (normative) Minus coplanarity and fibre plane angle determination . 15
D.1 Overview . 15
D.1.1 General . 15
D.1.2 Minus coplanarity . 15
D.1.3 Fibre plane X-axis and Y-axis angles . 15
D.2 Method for analysis . 15
D.2.1 Single row ferrules . 15
D.2.2 Multi-row ferrules . 16
Annex E (normative) Calculation of core dip using the paraboloid method . 17
E.1 General . 17
E.2 Method for analysis . 17
Annex F (normative) Calculation of GL parameter . 19
F.1 General . 19
F.2 Method for analysis . 19
Bibliography . 21
Figure 1 – Measurement regions on ferrule and fibre . 6
Figure 2 – Measurement setup. 7
Figure B.1 – Surface angle sign convention . 13
Figure C.1 – Fibre counting convention . 14
Figure D.1 – Illustration of fibre line and minus coplanarity parameters . 15
Figure E.1 – Paraboloid fit to a fibre endface exhibiting core dip . 18
Table 1 – Ferrule measurement areas and parameters . 7
Table F.1 – Parameter constants for 4-fibre ferrules . 20
Table F.2 – Parameter constants for 8-fibre ferrules . 20
IEC 61300-3-30:2026 © IEC 2026
Table F.3 – Parameter constants for 12-fibre ferrules . 20
IEC 61300-3-30:2026 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Fibre optic interconnecting devices and passive components -
Basic test and measurement procedures -
Part 3-30: Examinations and measurements -
Endface geometry of rectangular ferrule
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
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Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
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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
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any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 61300-3-30 has been prepared by subcommittee 86B: Fibre optic interconnecting devices
and passive components, of IEC technical committee 86: Fibre optics. It is an International
Standard.
This third edition cancels and replaces the second edition published in 2020. This edition
constitutes a technical revision.
IEC 61300-3-30:2026 © IEC 2026
This edition includes the following significant technical changes with respect to the previous
edition:
a) clarification of region diameter symbols;
b) introduction of x116 and x132 region of interest (ROI) to support MT-16 and MT-32 ferrule
types;
c) preparation of geometry limit (GL) parameter tables for 16-, 24- and 32-fibre ferrules;
d) clarification of the neighbouring fibres definition when computing adjacent height;
e) improvement of figures in Annexes.
The text of this International Standard is based on the following documents:
Draft Report on voting
86B/5224/FDIS 86B/5250/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
A list of all parts in the IEC 61300 series, published under the general title Fibre optic
interconnecting devices and passive components, can be found on the IEC website.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
IEC 61300-3-30:2026 © IEC 2026
1 Scope
This part of IEC 61300 describes a method for measuring the endface geometry of rectangular
multifibre ferrules having an IEC defined optical interface. The primary attributes are fibre
position relative to the endface, endface angle relative to the guide holes, fibre tip radii and
core dip for multimode fibres.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
4 General description
Guide pin based multifibre connector plugs in IEC 61754-5 and all parts of IEC 61754-7 typically
have a rectangular endface with a long axis and a short axis. Ideally a flat polish is desired on
the endface with the fibres protruding slightly and all in the same plane to assure physical
contact of the fibre cores when two connectors are intermated. In practice, the endface typically
has two different curvatures across the surface along the long and short axis. Since mated
ferrules are aligned by pins in the guide holes, the endface of the ferrule shall be properly
oriented (SX and SY angles) with respect to the guide holes to achieve positive contact. The
endface angle SX in the long axis (X-axis) and the endface angle SY in the short axis (Y-axis)
(as defined in Annex B) are measured by finding the best fit plane (P ), based on a percentage
J
of the highest points in a specified region of interest. The highest points typically show the
greatest modulation from an interferometric standpoint. This allows for more robust
measurements and greater repeatability between different interferometers.
The angle of the best fit plane P is calculated by comparing it to the reference plane P which
J
is perpendicular to the averaged axis of the guide holes. The height H (positive is a protrusion)
of the fibres is a planar height defined as the distance between the fibre endface and the best
fit plane. Core dip is only relevant to multimode fibres because the large core is softer than the
cladding of the fibre and tends to polish away faster. Core dip is calculated using the paraboloid
method described in Annex E.
One method is described for measuring the polish angle and fibre position for a single ferrule
multifibre connector by analysing the endface with a three-dimensional interferometry type
surface analyser.
IEC 61300-3-30:2026 © IEC 2026
5 Measurement regions
The following regions shall be defined on the ferrule endface.
a) Region of interest (ROI): the ROI is set on the ferrule surface and defined by a rectangular
region having a long axis (X-axis) and a short axis (Y-axis). The region of interest is chosen
to cover the intended contact zone of the ferrule endface when the ferrules are mated. The
region of interest shall be centred on the fibre array. See Figure 1. Refer to Table 1 for
measurement areas that shall be used for different connectors.
b) Extracting region: the extracting region, which includes the fibre endfac
...