EN 4533-002:2017
(Main)Aerospace series - Fibre optic systems - Handbook - Part 002: Test and measurement
Aerospace series - Fibre optic systems - Handbook - Part 002: Test and measurement
This handbook 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. Part 2 will explain the issues associated with optical link measurement and provide 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). It does not discuss systems tests e.g. bit error rates.
Luft- und Raumfahrt - Faseroptische Systemtechnik - Handbuch - Teil 002: Tests und Messung
Série aérospatiale - Systèmes des fibres optiques - Manuel d'utilisation - Partie 002: Essais et mesures
Aeronavtika - Sistemi iz optičnih vlaken - Priročnik - 002. del: Preskušanje in merjenje
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.PHUMHQMHLuft- und Raumfahrt - Faseroptische Systemtechnik - Handbuch - Teil 002: Tests und MessungenSérie aérospatiale - Systèmes des fibres optiques - Manuel d'utilisation - Partie 002: Essais et mesuresAerospace series - Fibre optic systems - Handbook - Part 002: Test and measurement49.060Aerospace electric equipment and systems33.180.01VSORãQRFibre optic systems in generalICS:Ta slovenski standard je istoveten z:EN 4533-002:2017SIST EN 4533-002:2018en,fr,de01-marec-2018SIST EN 4533-002:2018SLOVENSKI
STANDARDSIST EN 4533-002:20091DGRPHãþD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 4533-002
December
t r s y ICS
v {ä r x r Supersedes EN
v w u uæ r r tã t r r xEnglish Version
Aerospace series æ Fibre optic systems æ Handbook æ Part
r r tã Test and measurement Série aérospatiale æ Systèmes des fibres optiques æ Manuel d 5utilisation æ Partie
r r tã Essais et mesures
Luftæ und Raumfahrt æ Faseroptische Systemtechnik æ Handbuch æ Teil
r r tã Tests und Messungen This European Standard was approved by CEN on
t u July
t r s yä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
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t r s y CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
v w u uæ r r tã t r s y ESIST EN 4533-002:2018
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 10’s 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 lead 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. SIST EN 4533-002:2018
EN 2591-601, Aerospace series — Elements of electrical and optical connection — Test methods — Part 601: Optical elements — Insertion loss EN 4533-001, Aerospace series — Fibre optic systems — Handbook — Part 001: Termination methods and tools EN 4533-003, Aerospace series — Fibre optic systems — Handbook — Part 003: Looming and installation practices EN 4533-004, Aerospace series — Fibre optic systems — Handbook — Part 004: Repair, maintenance, cleaning and inspection 3 Fibre types This section gives a brief summary of some of the different fibre types in use within the aerospace industry. Historically, large core, step index multimode fibres were the first to be used on aircraft. At the time of design, these fibres enabled sufficient data bandwidth and the large core enabled ease of coupling (of light) into the fibre as well as ease of fibre alignment in connectors (also termed interconnects). Therefore in some current and legacy systems, fibre optic harnesses based on large core fibres can be found. Common larger core fibres include 200/280 µm, 200/300 µm and 100/140 µm (where the notation indicates the core/cladding size). Improvements in bandwidth (mainly from reduced temporal dispersion), for multimode fibres is possible by using graded index fibres. In simple terms, the graded refractive index profile allows equalisation of different optical paths through a multimode fibre to reduce any pulse spreading in time (dispersion). These results in higher bandwidths compared to step index refractive index profiles. Early graded index fibres for aerospace included 100/140 µm sized fibres. More recently, fibre sizes commonly used in the telecoms and datacomms fields have been utilised for aerospace. Multimode fibres of size 62,5/125 µm and 50/125 µm and with graded index profile are now being deployed for data transmission on both civil and military aircraft, fixed wind and rotary craft. Fibres are available with different bandwidths. Multimode fibres are designated by the OM identification (meaning ‘optical multimode’). OM1 describes 62,5/125 µm fibre, OM2, OM3 and OM4 describe 50/125 µm fibres of increasing bandwidth. Using these sizes of fibre (particularly with a 125 µm outer diameter enables the use of volume production parts (e.g. ceramic alignment ferrules) from the telecoms industry. SIST EN 4533-002:2018
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