SIST 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 (IEC 61300-3-30:2026)
- 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
- Public Enquiry End Date
- 31-Mar-2025
- Publication Date
- 24-Sep-2026
- Technical Committee
- MOC - Mobile Communications
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 16-Sep-2026
- Due Date
- 21-Nov-2026
- Completion Date
- 25-Sep-2026
SIST EN IEC 61300-3-30:2026 is SIST’s adoption of the IEC method for measuring the endface geometry of rectangular multifibre ferrules with an IEC defined optical interface. It specifies how to measure fibre position, endface angle relative to the guide holes, fibre tip radii, and core dip for multimode fibres. The standard is aimed at engineers, laboratories, manufacturers, and quality teams that need repeatable interferometric inspection of fibre optic connector ferrules.
What does SIST EN IEC 61300-3-30:2026 specify?
SIST EN IEC 61300-3-30:2026 specifies a test and measurement method for the endface geometry of rectangular multifibre ferrules. The method is built around a three-dimensional interferometry analysis of the ferrule endface, with results tied to the guide holes that locate the ferrule in the connector.
The document is organized into eight clauses and six normative annexes. The clauses cover scope, references, terms, the general measurement model, measurement regions, apparatus, procedure, and reporting. The annexes provide the geometry formulae, sign conventions, fibre counting convention, coplanarity analysis, core dip calculation, and GL calculation.
| 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 SIST EN IEC 61300-3-30:2026?
Geometry model and measurement regions
Clause 4 models the ferrule endface as a rectangular surface with long and short axes and defines the measured angles SX and SY relative to the guide holes. In practice, this is what makes the measurements meaningful for mating connectors, because the endface has to be oriented correctly for physical contact.
Clause 5 defines the regions used in the analysis: the ROI, extracting region, averaging region, and core dip region. The ROI is centered on the fibre array and covers the intended contact zone, while Table 1 assigns the measurement areas and region sizes to each ferrule type. This matters because the software must use the right region geometry for the specific connector variant.
Apparatus and measurement quality
Clause 6 requires a ferrule holder, positioning stage, interferometric video microscope, PC-based fringe interpretation unit, and monitor. The three-dimensional interferometry analyser must measure fibre heights within ±50 nm and core dips within ±20 nm. That level of precision is needed because the geometry features being judged are very small and the results depend on stable surface metrology.
Clause 6 also requires calibration of microscope magnification, phase shift actuator travel, and ferrule holder tilt for angled ferrules. In practice, users need to verify the setup before measurement so the fitted surface and derived angles are traceable to the actual instrument geometry.
Step-by-step procedure and calculated outputs
Clause 7 sets out a staged analysis from data set A through G. It maps the ferrule surface, removes the extracting regions, fits a bi-parabolic surface, removes high outliers, keeps the highest 20 % of points, and then fits the best-fit plane used for SX and SY. This sequence matters because the method is designed to focus on the contact-relevant points and reduce the effect of isolated high spots.
Clause 7 then calculates fibre height H, adjacent fibre height differential HA, ferrule surface radii RX and RY, and fibre tip spherical radii RF. For multimode fibres, it also calculates core dip C using Annex E, with a 10 nm threshold that determines whether C is reported for an individual fibre. In practice, this gives the user both overall ferrule shape and fibre-level surface detail.
Annex D adds minus coplanarity CF and the fibre plane angles GX and GY. The annex gives separate analysis paths for single-row ferrules and multi-row ferrules, so the counting pattern of the ferrule affects the way the results are calculated. Clause 7 also calls for GL when core dip is reported for 50 % or fewer fibres, using the median RF of fibres with negative C.
Formulae and reporting
Annex A gives the least-squares formulae used to approximate the ferrule surface and the fibre tip as ideal geometric shapes. Annex B defines the sign convention for endface angles, and Annex C defines how fibres are counted across the array. These conventions are important because they keep results consistent between instruments and between ferrule layouts.
Clause 8 requires the relevant specification and test report to identify the DUT characteristics, measurement setup, uncertainty, the measured and calculated parameters, and any deviations from the procedure. That means a test report should be usable as a technical record of how the ferrule was measured, not just as a final pass/fail statement.
What terms does SIST EN IEC 61300-3-30:2026 define?
- Region of interest (ROI) - the rectangular area on the ferrule surface that covers the intended contact zone and is centered on the fibre array.
- Extracting region - the circular area around each fibre, including the fibre endface and associated adhesive region, that is removed before the ferrule surface fit.
- Averaging region - the circular area on each fibre surface used to calculate fibre height H.
- Core dip region - the circular area on each fibre surface used for the paraboloid fit that produces core dip C.
- Minus coplanarity (CF) - the greatest parallel offset between the best-fit fibre plane or line and the lowest fibre end relative to that plane or line.
- Geometry limit (GL) - a merit function used to quantify the acceptability of an endface geometry from SX, CF, and RF.
- Fibre plane X-axis angle (GX) and fibre plane Y-axis angle (GY) - the tilt of the fitted fibre plane relative to the average guide hole axes.
Who uses SIST EN IEC 61300-3-30:2026?
SIST EN IEC 61300-3-30:2026 is used by manufacturers of fibre optic interconnecting devices and passive components, especially when working with rectangular multifibre ferrules and guide pin based connector plugs. It is also used by test laboratories, product development teams, and quality assurance staff who need a common measurement method for polish angle, fibre height, tip radius, and core dip.
Buyers and incoming inspection teams can use it to compare supplier measurements and to specify what must appear in a report. It is also relevant to anyone evaluating MT or MPO connector families and related ferrule types in manufacturing or certification work.
What changed in SIST EN IEC 61300-3-30:2026 from the previous edition?
SIST EN IEC 61300-3-30:2026 replaces SIST EN IEC 61300-3-30:2021. The foreword identifies these technical changes from the previous edition:
- 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 SIST EN IEC 61300-3-30:2026?
The bibliography links this method to the IEC 61300 family and to related connector-interface standards:
- IEC 61300 (all parts) - the parent series of basic test and measurement procedures for fibre optic interconnecting devices and passive components.
- IEC 61755-3-31:2015 - connector parameters for non-dispersion shifted single mode physically contacting fibres in angled polyphenylene sulphide rectangular ferrules.
- IEC 61755-3-32:2015 - connector parameters 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 - Type MT connector family.
- IEC 61754-7 (all parts) - Type MPO connector family.
What does the SIST EN IEC 61300-3-30:2026 document contain?
SIST EN IEC 61300-3-30:2026 contains the measurement regions, apparatus description, test sequence, and reporting items needed for interferometric inspection of rectangular ferrules. It also includes figures for the measurement setup, the region layout, surface angle sign convention, fibre counting, minus coplanarity, and the paraboloid core dip method.
The tables provide ferrule measurement areas and parameters for the covered ferrule types, plus GL parameter constants by fibre count. The annexes provide the formulae and conventions that software and test methods need for consistent design verification, laboratory testing, and inspection reporting.
Relations
- Effective Date
- 01-Nov-2026
- 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
SIST EN IEC 61300-3-30:2026 is a standard published by the Slovenian Institute for Standardization (SIST). 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 (IEC 61300-3-30:2026)". 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.
SIST 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.
SIST EN IEC 61300-3-30:2026 has the following relationships with other standards: It is inter standard links to SIST EN IEC 61300-3-30:2021, SIST EN IEC 63267-3-81:2025, SIST EN 50377-11-1:2008, SIST EN 61755-3-31:2016, SIST EN 61300-1:2017, SIST EN 61755-3-32:2016. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST 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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consensus of opinion on the relevant subjects since each technical committee has representation from all
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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
...