1、BRITISH STANDARD BS EN 61300-3-26: 2002 Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-26: Examinations and measurements Measurement of the angular misalignment between fibre and ferrule axes The European Standard EN 61300-3-26:2002 has the st
2、atus of a British Standard ICS 33.180.20 BS EN 61300-3-26:2002 This British Standard, having been prepared under the direction of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 25 November 2002 BSI 25 Nov
3、ember 2002 ISBN 0 580 40789 6 National foreword This British Standard is the official English language version of EN 61300-3-26:2002. It is identical with IEC 61300-3-26:2002. It supersedes BS EN 61300-3-26:1997 which is withdrawn. The UK participation in its preparation was entrusted by Technical C
4、ommittee GEL/86, Fibre optics, to Subcommittee GEL/86/2, Fibre optic interconnecting devices and passive components, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which imp
5、lement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication d
6、oes not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/Europ
7、ean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pag
8、es 2 to 15 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 61300-3-26 NORME EUROPENNE EUROPISCHE NORM November 2002 CENELEC European Committee for Electrote
9、chnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No.
10、EN 61300-3-26:2002 E ICS 33.180.20 Supersedes EN 61300-3-26:1997 English version Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 3-26: Examinations and measurements - Measurement of the angular misalignment between fibre and ferrule axes (IEC 6
11、1300-3-26:2002) Dispositifs dinterconnexion et composants passifs fibres optiques - Mthodes fondamentales dessais et de mesures Partie 3-26: Examens et mesures - Mesure de lerreur dalignement angulaire des embouts avec fibre (CEI 61300-3-26:2002) Lichtwellenleiter-Verbindungselemente und passive Bau
12、teile - Grundlegende Prf- und Messverfahren Teil 3-26: Untersuchungen und Messungen - Messung des Winkelversatzes zwischen Faser- und Stiftachse (IEC 61300-3-26:2002) This European Standard was approved by CENELEC on 2002-11-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regul
13、ations 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 Central Secretariat or to any CENELEC member. Thi
14、s 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 Central Secretariat has the same status as the official versions. CENELEC member
15、s are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.Foreword The text of document 86B
16、/1707/FDIS, future edition 2 of IEC 61300-3-26, 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 was approved by CENELEC as EN 61300-3-26 on 2002-11-01. This European Standard supersedes EN
17、61300-3-26:1997. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2003-08-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2005
18、-11-01 Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for information only. In this standard, annex ZA is normative and annex A is informative. Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Stan
19、dard IEC 61300-3-26:2002 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 standards indicated: IEC 61300-1 NOTE Harmonized as EN 61300-1:1997 (not modified). IEC 61300-3-15 NOTE Harmonized
20、 as EN 61300-3-15:1997 (not modified). IEC 61300-3-16 NOTE Harmonized as EN 61300-3-16:1997 (not modified). _ Page2 EN61300326:2002CONTENTS 1 Scope.4 2 Normative references .5 3 Apparatus.5 3.1 Ferrule holder5 3.2 Light source 5 3.3 Screen 5 3.4 Data processing equipment .5 4 Procedure.6 5 Details t
21、o be specified 8 Annex A (informative) Evaluation of the angular misalignment from the deviation of the light spot9 A.1 Evaluation of the fibre tilt from the radius of curvature and eccentricity of the dome vertex.9 A.2 Equation for the angular misalignment between fibre and ferrule axis evaluation.
22、10 Annex ZA (normative) Normative references to international publication with their Corresponding European publications 14 Bibliography15 Figure 1 Definition of the fibre misalignment angle.4 Figure 2 Measurement set-up 5 Figure 3 Position of the marker to indicate the dome vertex fibre core direct
23、ion 6 Figure 4 Measurement parameters.7 Figure 5 Definition of the reference orthogonal axis system .7 Figure A.1 Evaluation of the fibre tilt with respect to the ferrule axis 9 Figure A.2 Definition of the angles used in the equations for the misalignment evaluation11 Figure A.3 Evaluation of the a
24、ngular misalignment from its components 13 Page3 EN61300326:2002FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND MEASUREMENT PROCEDURES Part 3-26: Examinations and measurements Measurement of the angular misalignment between fibre and ferrule axes 1 Scope This part of IEC 61
25、300 describes the procedure to determine the angular misalignment between the fibre and the ferrule axes in a cylindrical ferrule for singlemode fibre optical connectors with fibre installed. General description This procedure describes the measurement of the angular misalignment between the fibre a
26、nd the ferrule axes in a cylindrical ferrule for fibre optic connectors with fibre installed. Angular misalignment is defined as the angle between the axis of the ferrule and the axis of the installed fibre (see Figure 1). This procedure measures angular misalignment by measuring the deviation in th
27、e far field pattern coming from the core as the ferrule is rotated around its axis. Ferrule axis Fibre axis Ferrule Fibre IEC 2142/02 Figure 1 Definition of the fibre misalignment angle In a optical connector typical values of angular misalignment are in the range of tenths of a degree. At 5 mm from
28、 the ferrule surface, the diameter of the light spot (white light) is about 1 mm. On rotating the connector the displacement of the spot is of the order of 1/100 of the spot diameter (45 m for an angular misalignment of 0,5 at 5 mm from the fibre surface). To detect such a displacement a high precis
29、ion, automatically controlled set-up is necessary. The deviation of the spot coming from the fibre is also affected by the tilt of the fibre surface with respect to the ferrule axis. This deflection is described by Snells law. It is possible to calculate the contribution due to the tilt of the fibre
30、 surface from the curvature radius and the apex offset eccentricity. Some notes and explanation about the equations used in this document to correct this effect are given in Annex A. Page4 EN61300326:20022 Normative references The following referenced documents are indispensable for the application
31、of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 2538, Geometrical Product Specifications (GPS) Series of angles and slopes on prisms 3 Apparatus The apparatus, shown
32、in Figure 2, consists of the following elements: 3.1 Ferrule holder The ferrule is placed and rotated in a precise V-groove holder or in a centring mechanism. According to ISO 2538 the preferred angle for the V-groove is 108. 3.2 Light source A white light source is used. 3.3 Screen The spot from th
33、e fibre is projected on a screen. The screen could be the CCD chip of a video camera. The screen shall be perpendicular to the axis of the V-groove or centring mechanism. 3.4 Data processing equipment A computer, with suitable software, processes the images from the video camera and analyses the acq
34、uired data. Monitor showing the spot image Computer for data processing CCD chip Ferrule holder Ferrule White light source Video camera IEC 2143/02 Figure 2 Measurement set-up Page5 EN61300326:20024 Procedure Before the measurement of the angular misalignment, the radius of curvature, dome apex offs
35、et value and its position relevant to the fibre core shall be measured on the ferrule under test. The direction of the fibre core with respect to the dome offset shall be marked on the ferrule (see Figure 3). The ferrule is placed in the holder with the marker of the dome offset fibre core direction
36、 in a known position. In this way it will be possible to evaluate the light spot position, given by the angle , with respect to this marker. Dome vertex Fibre core ferrule axis Dome vertex fibre core direction Marker Fibre Ferrule endface IEC 2144/02 Figure 3 Position of the marker to indicate the d
37、ome vertex fibre core direction The ferrule is rotated in steps of 90 or less, until a complete rotation is made. At each position the outline of the light spot is acquired and the centre position is estimated by means of a fitting procedure. When the centre coordinates of each ferrule position are
38、acquired, the circle that best fits these points shall be found. The angle of the light spot deviation is given by L r arctan where r is the radius of the circle fitting the spot centre positions, and L is the distance of the screen from the ferrule surface (see Figure 4). Page6 EN61300326:2002Dome
39、vertex fibre core direction mark Rotation direction CCD target Ferrule holder Ferrule Video camera L r Circle formed by the centres of the spots, found by turning the ferrule CCD target Ferrule endface Marker position at the first acquisition First spot image Second spot image Third spot image r Ima
40、ges acquired by the video system IEC 2145/02 Figure 4 Measurement parameters In order to have an error in in the range of 0,01 (about 10 % of the value) it is necessary to know r to better than 1 m accuracy and L to better than 0,1 mm accuracy. The angle is evaluated from the position of the first i
41、mage acquired with respect to the marker indicating the dome vertex fibre core direction. X Y Dome vertex Ferrule surface Fibre IEC 2146/02 Figure 5 Definition of the reference orthogonal axis system Page7 EN61300326:2002In an orthogonal axis system, centred on the fibre core and with the positive X
42、 axis along the direction of the dome vertex fibre core, the two components of , xand y , are (see Annex A) (see Figure 5): cos tan arctan x sin tan arctan y The angle between the normal to the fibre surface and the ferrule axis is (see Annex A): R e arcsin where e is the eccentricity of the dome ve
43、rtex, and R is the radius of the polished surface. In the orthogonal axis system defined before, the two components xand yof the misalignment angle are: n x x sin arcsin n y y sin arcsin where n is the refractive index of the fibre. From these components the misalignment angle between the fibre axis
44、 and the ferrule axis is: y x 2 2 tan tan arctan 5 Details to be specified The following details, as applicable, shall be specified in the detail specification: allowable angular misalignment; required accuracy of the measurement; light source; distance L. Page8 EN61300326:2002Annex A (informative)
45、Evaluation of the angular misalignment from the deviation of the light spot A.1 Evaluation of the fibre tilt from the radius of curvature and eccentricity of the dome vertex The angle between the ferrule axis and the normal to the centre of the fibre surface is due to the eccentricity of the dome ve
46、rtex. Referring to Figure A.1 the angle can be written as R e arcsin where R is the radius of curvature of the polished surface and e is the eccentricity of the dome vertex. R Dome vertex Fibre core e Fibre axis Normal to fibre surface IEC 2147/02 Figure A.1 Evaluation of the fibre tilt with respect
47、 to the ferrule axis Page9 EN61300326:2002A.2 Equation for the angular misalignment between fibre and ferrule axis evaluation From the law of refraction, the light spot coming from the fibre deflects from the axis of the fibre core depending on the angle of the fibre endface. In Figure A.2 the angle
48、s used for the evaluation of the fibre angular misalignment are shown and defined. With a simple trigonometric consideration we can write: ) cos( ) sin( ) tan( ) cos( x ) sin( ) sin( ) tan( ) cos( y From these equations we obtain: ) cos( ) tan( arctan x ) sin( ) tan( arctan y Page10 EN61300326:2002 sin( ) cos( ) x y x y sin( ) cos( ) sin( ) sin( ) X Y X plane Y plane 3 rdview Fib
