1、BSI Standards PublicationFibre optic interconnecting devices and passive components Connector optical interfacesPart 2-4: Connection parameters of non-dispersion shifted single-modephysically contacting fibres Non-angled for reference connection applicationsBS EN 61755-2-4:2015National forewordThis
2、British Standard is the UK implementation of EN 61755-2-4:2015. It isidentical to IEC 61755-2-4:2015.The UK participation in its preparation was entrusted by TechnicalCommittee GEL/86, Fibre optics, to Subcommittee GEL/86/2, Fibre opticinterconnecting devices and passive components.A list of organiz
3、ations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015IS
4、BN 978 0 580 73814 2ICS 33.180.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 March 2015.Amendments/corrigenda issued since publicationDate Text affectedBRIT
5、ISH STANDARDBS EN 61755-2-4:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61755-2-4 February 2015 ICS 33.180.20 English Version Fibre optic interconnecting devices and passive components - Connector optical interfaces - Part 2-4: Connection parameters of non-dispersion shifted single-mode
6、 physically contacting fibres - Non-angled for reference connection applications (IEC 61755-2-4:2015) Dispositifs dinterconnexion et composants passifs fibres optiques - Interfaces optiques de connecteurs pour fibres optiques - Partie 2-4: Connexion de fibres unimodales dispersion non dcale en conta
7、ct physique sans angle, avec polissage, pour applications en tant que connecteurs de rfrence (IEC 61755-2-4:2015) Lichtwellenleiter - Verbindungselemente und passive Bauteile -Optische Schnittstellen von Lichtwellenleiter-Steckverbindern - Teil 2-4: Optische Schnittstelle von nicht-dispersionsversch
8、obenen, nicht abgeschrgten Einmodenfasern mit physikalischem Kontakt fr die Anwendung mit Referenzsteckverbindern (IEC 61755-2-4:2015) This European Standard was approved by CENELEC on 2015-02-12. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the condi
9、tions 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 ex
10、ists 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 na
11、tional electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, P
12、ortugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B
13、-1000 Brussels 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 61755-2-4:2015 E BS EN 61755-2-4:2015EN 61755-2-4:2015 - 2 - Foreword The text of document 86B/3845/FDIS, future edition 1 of IEC 61755-2-4, prepared by SC 86B “Fib
14、re 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 61755-2-4:2015. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of
15、 an identical national standard or by endorsement (dop) 2015-11-12 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2018-02-12 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN
16、ELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 61755-2-4:2015 was approved by CENELEC as a European Standard without any modification. BS EN 61755-2-4:2015- 3 - EN 61755-2-4:2015 Annex ZA (nor
17、mative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For und
18、ated references, the latest edition of the referenced document (including any amendments) applies. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European
19、Standards listed in this annex is available here: www.cenelec.eu. Publication Year Title EN/HD Year IEC 60793-2-50 - Optical fibres - Part 2-50: Product specifications - Sectional specification for class B single-mode fibres EN 60793-2-50 - IEC 61300-3-4 - Fibre optic interconnecting devices and pas
20、sive components - Basic test and measurement procedures - Part 3-4: Examinations and measurements - Attenuation EN 61300-3-4 - IEC 61300-3-42 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-42: Examinations and measurements - Attenuation
21、of single mode alignment sleeves and or adaptors with resilient alignment sleeves EN 61300-3-42 - IEC 61755-2-1 - Fibre optic connector optical interfaces - Part 2-1: Optical interface standard single mode non-angled physically contacting fibres EN 61755-2-1 - IEC 61755-2-2 - Fibre optic connector o
22、ptical interfaces - Part 2-2: Optical interface standard single mode 8 degrees angled physically contacting fibres EN 61755-2-2 - IEC 61755-3 (mod) series Fibre optic connector optical interfaces EN 61755-3 series IEC/TR 62627-04 - Fibre optic interconnecting devices and passive components - Part 04
23、: Example of uncertainty calculation: Measurement of the attenuation of an optical connector - - BS EN 61755-2-4:2015 2 IEC 61755-2-4:2015 IEC 2015 CONTENTS 1 Scope 5 2 Normative references 5 3 Performance grades 6 4 Description 6 5 Criteria for a fit within performance grades 7 5.1 General . 7 5.2
24、Attenuation grades and criteria . 7 6 Use of selected fibre to assemble reference connector plugs . 9 7 Reference adaptor . 9 8 Attenuation measurement uncertainty contribution . 9 Annex A (informative) Example of determination of the attenuation measurement uncertainty 10 Figure 1 Representation of
25、 fibre core position of single connector plug under the assumption of worst case alignment with identical connector plug. 8 Figure A.1 Attenuation measurement uncertainty contribution for Grade 1 reference connectors 10 Table 1 Single-mode attenuation grades at 1 310 nm . 6 Table 2 Mode field diamet
26、er and fibre core nominal index of refraction for fibre to be used in reference connector plugs 7 Table 3 Measurement uncertainty contribution of reference connectors . 9 BS EN 61755-2-4:2015IEC 61755-2-4:2015 IEC 2015 5 FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS CONNECTOR OPTICAL IN
27、TERFACES Part 2-4: Connection parameters of non-dispersion shifted single-mode physically contacting fibres Non-angled for reference connection applications 1 Scope This part of IEC 61755 defines a set of prescribed conditions that should be maintained in order to satisfy the requirements of non-ang
28、led polished reference connections. The prescribed conditions include dimensional limits and optical fibre requirements of the optical interface to meet specific requirements for reference connection (plugs and adaptors) used for attenuation measurements. Two different grades for reference connectio
29、ns are defined in this standard. The use of each of these grades depends on the application and on the targeted attenuation measurement uncertainty. The model uses a Gaussian distribution of light intensity over the specified restricted mode field diameter (MFD) range. This standard is intended to b
30、e used for shipping and acceptance inspections. The reference connector plug is specified for B1.1, B1.3 and B6 fibres as specified in IEC 60793-2-50. The use of the reference connector plug would not be recommended where classification of fibre is difficult, for example construction and maintenance
31、 of cable plant. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (in
32、cluding any amendments) applies. IEC 60793-2-50, Optical fibres Part 2-50: Product specifications Sectional specification for class B single-mode fibres IEC 61300-3-4, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-4: Examinations and measurem
33、ents Attenuation IEC 61300-3-42, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-42: Examinations and measurements Attenuation of single mode alignment sleeves and or adaptors with resilient alignment sleeves IEC 61755-2-1, Fibre optic intercon
34、necting devices and passive components Connector optical interfaces Part 2-1: Connection parameters of non-dispersion shifted single-mode physically contacting fibres Non-angled BS EN 61755-2-4:2015 6 IEC 61755-2-4:2015 IEC 2015 IEC 61755-2-2, Fibre optic interconnecting devices and passive componen
35、ts Connector optical interfaces Part 2-2: Connection parameters of non-dispersion shifted single-mode physically contacting fibres Angled IEC 61755-3 (all parts), Fibre optic interconnecting devices and passive components Connector opticla interfaces Part 3-x: Connector parameters of non-dispersion
36、shifted single-mode physically contacting fibres IEC TR 62627-04, Fibre optic interconnecting devices and passive components Technical report Part 04: Example of uncertainty calculation: Measurement of the attenuation of an optical connector 3 Performance grades Performance grades for PC polished re
37、ference connectors are given in Table 1. The specified attenuation for each grade is obtained when the reference plugs are connected to each other with the reference adaptor. Table 1 Single-mode attenuation grades at 1 310 nm Reference grade aAttenuation adB Contribution to measurement uncertainty b
38、dB R1 0,1 0,1 R2 0,2 0,2 aUnder the assumption of worst case alignment with identical connector plug. Expected attenuation measured when connecting two plugs of the same grade may be higher due to significant measurement uncertainty. bAs described in Clause 8. 4 Description Optical reference connect
39、or plugs are connector plugs manufactured with restricted tolerances for dimensions relevant to lateral and angular offset. These connector plugs are used for attenuation measurement purposes according to IEC 61300-3-4, and shall be considered as part of the measurement set-up since they strongly co
40、ntribute to its measurement uncertainty (for example see IEC TR 62627-04). The attenuation measurement uncertainty contributions for both grades of reference connectors are listed in Table 3. The principal performance of a reference connector plug is given by its contribution to measurement uncertai
41、nty (estimated based on the reproducibility of an attenuation measurement of the same device performed using multiple different reference connector plugs of the same grade) which is determined by the accuracy with which the core of the optical fibre is aligned to the optical datum target and determi
42、nes the random attenuation performance of a reference connector population. The main parameters influencing the performance of the reference connector plugs are fibre core location, fibre core axis angle and mode field diameter variability. Figure 1 represents the fibre alignment tolerances for the
43、two different reference grades described in this standard, under the assumption of using selected reference fibre, described in Table 2. The design curves given in Figure 1 each represent maximum allowable combinations of a given specific fibre core location and an associated fibre core axis angle t
44、o not exceed the specified attenuation of any single considered connection. The design curves shown represent the determination of the parameters under a worst case mismatch of the mode field diameter of the selected fibres as given in Table 3, i.e. 9,1/9,3 m and a wavelength of 1 310 nm. These mode
45、 field diameter ranges are selected within the IEC 60793-2-50 family specification for single mode non-dispersion shifted fibres as given in Table 2. BS EN 61755-2-4:2015IEC 61755-2-4:2015 IEC 2015 7 5 Criteria for a fit within performance grades 5.1 General Figure 1 and Table 2 give the criteria fo
46、r meeting the performance grades listed above in Table 1. The parameters chosen for the criteria definition are based on the degree of significance in affecting the performance under test. 5.2 Attenuation grades and criteria Considering a beam with a Gaussian distribution, the coupling efficiency, ,
47、 of two, single-mode fibres is given by Equation (1). The mode field diameters and the nominal index of refraction of the fibre core are given in Table 2. Table 2 Mode field diameter and fibre core nominal index of refraction for fibre to be used in reference connector plugs Fibre type Nominal wavel
48、ength nm MFD am n0Min. Max. Dispersion unshifted fibre 1 310 9,1 9,3 1,452 0 a MFD as specified here has a narrow tolerance compared to the tolerance field in IEC 60793-2-50. The attenuation (also referred to as insertion loss, IL, or coupling efficiency) of the fibres equals combined. Attenuation c
49、ombinedis expressedas in Equation (1) below. ( )( )( )( )( )+= 22122212222022122222122212combinedsin22exp2log10nd(1) where d is the total lateral offset; is the angular misalignment between fibre cores; is the wavelength of transmitted light in vacuum; n0 is the index of refraction of the fibre core; 1is the transmit fibre mode field radius; 2is the receive fibre mode field radius. The definition of referen
