prEN 4533-002

SLOVENSKI STANDARD
01-junij-2024
Aeronavtika - Sistemi iz optičnih vlaken - Priročnik - 002. del: Preskušanje in
merjenje
Aerospace series - Fibre optic systems - Handbook - Part 002: Test and measurement
Luft- und Raumfahrt - Faseroptische Systeme - Handbuch - Teil 002: Prüfung und
Messung
Série aérospatiale - Systèmes des fibres optiques - Manuel d’utilisation - Partie 002 :
Essais et mesures
Ta slovenski standard je istoveten z: prEN 4533-002
ICS:
33.180.01 Sistemi z optičnimi vlakni na Fibre optic systems in
splošno general
49.060 Letalska in vesoljska Aerospace electric
električna oprema in sistemi equipment and systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2024
ICS 49.060 Will supersede EN 4533-002:2017
English Version
Aerospace series - Fibre optic systems - Handbook - Part
002: Test and measurement
Série aérospatiale - Systèmes des fibres optiques - Luft- und Raumfahrt - Faseroptische Systeme -
Manuel d'utilisation - Partie 002 : Essais et mesures Handbuch - Teil 002: Prüfung und Messung
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.
If this draft becomes a European Standard, CEN 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.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 4533-002:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Fibre types . 5
5 Test and measurement: key parameters . 6
5.1 Insertion loss (I.L.) . 6
5.2 Return or reflection loss. 7
5.3 Optical power measurement . 8
5.4 Light distribution . 11
5.5 Temporal measurements . 11
6 Test and measurement in single-mode systems. 11
7 Test and measurement in multi-mode systems . 12
7.1 General. 12
7.2 Launch conditions. 12
7.3 Generating suitable launch conditions . 16
7.4 Examples of suitable launch conditions for aerospace testing . 17
8 Testing network paths: reflectometry and footprinting . 22
8.1 General. 22
8.2 OTDRs. 23
8.3 OFDRs . 26
8.4 Footprinting . 28
9 General considerations for test and measurement in fibre optic systems . 29
9.1 General. 29
9.2 Instrument-issues . 29
9.3 Test leads . 29
9.4 Adapters (uniters) . 30
9.5 Connectors . 30
9.6 Filters and test leads . 32
10 Practical testing techniques . 32
10.1 General. 32
10.2 Insertion loss . 33
10.3 Different insertion loss techniques . 33
10.4 Single connector insertion loss . 38
10.5 Mode conditioning in test leads . 38
10.6 Return loss schemes . 39
11 Reporting arrangements . 41
12 Techniques for system design . 41
12.1 General. 41
12.2 Interpretation of component data sheets . 41
12.3 Computer modelling . 42
13 Appendix: matrices . 44
Bibliography . 47
European foreword
This document (prEN 4533-002:2024) has been prepared by ASD-STAN.
After enquiries and votes carried out in accordance with the rules of this Association, this document has
received the approval of the National Associations and the Official Services of the member countries of
ASD-STAN, prior to its presentation to CEN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 4533-002:2017.
The main changes with respect to the previous edition are as follows:
— update of the document to remove trademarks.
Introduction
a) The handbook
This handbook aims to provide general guidance for experts and non-experts alike in the area of
designing, installing, and supporting fibre-optic systems on aircraft. Where appropriate more detailed
sources of information are referenced throughout the text.
It is arranged in 4 parts, which reflect key aspects of an optical harness life cycle, namely:
— Part 001: Termination methods and tools;
— Part 002: Test and measurement;
— Part 003: Looming and installation practices;
— Part 004: Repair, maintenance, cleaning and inspection.
b) Background
It is widely accepted in the aerospace industry that photonic technology significant advantages over
conventional electrical hardware. These include massive signal bandwidth capacity, electrical safety,
and immunity of passive fibre-optic components to the problems associated with electromagnetic
interference (EMI). Significant weight savings can also be realized in comparison to electrical harnesses
which may require heavy screening. To date, the EMI issue has been the critical driver for airborne
fibre-optic communications systems because of the growing use of non-metallic aerostructures.
However, future avionic requirements are driving bandwidth specifications from 10s of Mbits/s into the
multi-Gbits/s regime in some cases, i.e. beyond the limits of electrical interconnect technology. The
properties of photonic technology can potentially be exploited to advantage in many avionic
applications, such as video/sensor multiplexing, flight control signalling, electronic warfare, and
entertainment systems, as well as sensor for monitoring aerostructure.
The basic optical interconnect fabric or ‘optical harness’ is the key enabler for the successful
introduction of optical technology onto commercial and military aircraft. Compared to the mature
telecommunications applications, an aircraft fibre-optic system needs to operate in a hostile
environment (e.g. temperature extremes, humidity, vibration, and contamination) and accommodate
additional physical restrictions imposed by the airframe (e.g. harness attachments, tight bend radii
requirements, and bulkhead connections). Until recently, optical harnessing technology and associated
practices were insufficiently developed to be applied without large safety margins. In addition, the
international standards did not adequately cover many aspects of the life cycle. The lack of accepted
standards thus leads to airframe specific hardware and support. These factors collectively carried a
significant cost penalty (procurement and through-life costs), that often made an optical harness less
competitive than an electrical equivalent. This situation is changing with the adoption of more
standardized (telecoms type) fibre types in aerospace cables and the availability of more ruggedized
COTS components. These improved developments have been possible due to significant research
collaboration between component and equipment manufacturers as well as the end use airframers.
1 Scope
This document examines the requirements to enable accurate measurement of fibre optic links from
start of life and during the life cycle of the system from installation and through-service. This document
explains the issues associated with optical link measurement and provides techniques to address these
issues. This document discusses the measurement of key parameters associated with the passive layer
(i.e. transmission of light through an optical harness). This document does not discuss systems tests, e.g.
bit error rates.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
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