EN 61300-3-47-2014 en Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-47 Examinations and measurements - End face geomet.pdf

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1、BSI Standards PublicationFibre optic interconnecting devices and passive components Basic test and measurement proceduresPart 3-47: Examinations and measurements End face geometry of PC/APC spherically polished ferrules using interferometryBS EN 61300-3-47:2014National forewordThis British Standard

2、is the UK implementation of EN 61300-3-47:2014. It isidentical to IEC 61300-3-47:2014. It supersedes BS EN 61300-3-15:2007, BS EN 61300-3-16:2003, BS EN 61300-3-17:2000, and BS EN 61300-3-23:1998, which are withdrawn.The UK participation in its preparation was entrusted by TechnicalCommittee GEL/86,

3、 Fibre optics, to Subcommittee GEL/86/2, Fibre opticinterconnecting devices and passive components.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are respon

4、sible for its correct application. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 75365 7ICS 33.180.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards

5、Policy and Strategy Committee on 31 October 2014.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 61300-3-47:2014EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 61300-3-47 September 2014 ICS 33.180.20 English Version Fibre optic interconnecting devices and pass

6、ive components - Basic test and measurement procedures - Part 3-47:Examinations and measurements - End face geometry of PC/APC spherically polished ferrules using interferometry (IEC 61300-3-47:2014) Dispositifs dinterconnexion et composants passifs fibresoptiques - Procdures fondamentales dessais e

7、t de mesures - Partie 3-47: Examens et mesures - Gomtrie de lextrmit des frules PC/APC polies de faon sphriquepar interfromtrie (CEI 61300-3-47:2014) Lichtwellenleiter - Verbindungselemente und passiveBauteile - Grundlegende Prf- und Messverfahren - Teil 3-47: Untersuchungen und Messungen - Endflche

8、ngeometrie von sphrisch polierten PC/APC-Ferrulen mittels Interferometrie (IEC 61300-3-47:2014) This European Standard was approved by CENELEC on 2014-08-28. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard

9、 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

10、, 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 Aus

11、tria, 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, Portugal, Romania, Slovakia, Slovenia, Spa

12、in, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation ElectrotechniqueEuropisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CENELEC All rights of

13、exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 61300-3-47:2014 E EN 61300-3-47:2014 - 2 - Foreword The text of document 86B/3773/FDIS, future edition 1 of IEC 61300-3-47, prepared by subcommittee 86B “Fibre optic interconnecting devices and passive comp

14、onents” of IEC/TC 86 “Fibre optics“ was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 61300-3-47:2014. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsemen

15、t (dop) 2015-05-28 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2017-08-28 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible fo

16、r identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 61300-3-47:2014 was approved by CENELEC as a European Standard without any modification. BS EN 61300-3-47:2014 2 IEC 61300-3-47:2014 IEC 2014 CONTENTS 1 Scope 5 2 Terms and definitions 5 3 Meas

17、urement by interferometer . 7 3.1 General . 7 3.2 Ferrule/connector holder . 7 3.3 Optical interferometric system . 8 3.4 Microscope with camera 8 4 Requirements for the interferometer 8 4.1 XY calibration (radius of curvature) . 8 4.2 Z calibration (fibre height) . 8 4.3 Alignment of ferrule axis w

18、ith the interferometers optical axis (apex offset calibration) 8 4.4 Tilt and key angle . 8 5 Measurement method 8 5.1 General . 8 5.2 Measurement regions . 9 5.3 Measurement procedure for the radius of curvature 9 5.4 Measurement procedure for the dome eccentricity (apex offset) 10 5.5 Measurement

19、procedure for fibre height 10 6 Details to be specified . 13 Annex A (normative) Calibration for the interferometer . 14 A.1 XY calibration . 14 A.2 Z calibration 14 A.3 Alignment of the ferule axis with the optical axis of the interferometer (“apex offset calibration”) . 14 A.4 Tilt and key angle .

20、 14 Annex B (informative) Measurement procedure for end face “angle error” of angled convex polished ferrules . 15 Annex C (informative) Formula for calculating ferrule end face geometry . 17 Figure 1 Radius of curvature of a spherically polished ferrule end face 5 Figure 2 Apex offset of a spherica

21、lly polished ferrule end face . 6 Figure 3 Fibre height of a spherically polished ferrule end face 6 Figure 4 Ferrule end face angle for spherically polished ferrules 7 Figure 5 Interferometer 7 Figure 6 Ferrule end face and measurement regions . 9 Figure 7 Ferrule end face surface 11 Figure 8 Fitti

22、ng region and averaging region of the ferrule end face surface 11 Figure 9 Converted end face surface of the ferrule . 12 Figure 10 Converted ferrule end face surface without the extracting region 12 Figure B.1 Example of key error calculated from interference pattern for a convex polished ferrule .

23、 15 BS EN 61300-3-47:2014IEC 61300-3-47:2014 IEC 2014 5 FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND MEASUREMENT PROCEDURES Part 3-47: Examinations and measurements End face geometry of PC/APC spherically polished ferrules using interferometry 1 Scope This part of IEC 61

24、300 describes a procedure to measure the end face geometry of a spherically polished ferrule or connector. Within this standard the words “ferrule” and “connector” can be used interchangeably. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 r

25、adius of curvature B radius of curvature of the portion of the spherically polished ferrule end face which is domed for physical contact Note 1 to entry: It is assumed that the end face is spherical, although in practice the end face is often aspherical (see Figure 1). B IEC Figure 1 Radius of curva

26、ture of a spherically polished ferrule end face 2.2 apex offset C distance between the axis of the ferrule and the line parallel to the axis which passes through the vertex (or highest point on the dome), formed by spherically polishing the ferrule, as shown in Figure 2 BS EN 61300-3-47:2014 6 IEC 6

27、1300-3-47:2014 IEC 2014 Apex or highest point on dome Apex offset (C) Ferrule Axis of ferrule IEC Figure 2 Apex offset of a spherically polished ferrule end face 2.3 fibre height average distance between the fibre end face and a virtual spherical surface which is fitted to the spherically polished f

28、errule end face (see Annex C) Note 1 to entry: It is assumed that a circular region of the ferrule end face, which is centred to the ferrule axis, is spherical although in practice the end face is often aspherical. A positive value indicates fibre undercut (see Figure 3a). A negative value indicates

29、 fibre protrusion (see Figure 3b). Fibre height Virtual spherical surface Spherically polished ferrule end face Ferrule Fibre Adhesive +A IEC Figure 3a Fibre height +A -A IEC Figure 3b Fibre height A (protrusion) Figure 3 Fibre height of a spherically polished ferrule end face BS EN 61300-3-47:2014I

30、EC 61300-3-47:2014 IEC 2014 7 2.4 end face angle angle () between the plane perpendicular to the axis of the ferrule, and the straight line tangent to the polished surface at the fibre centre in the direction of the nominal angle (see Figure 4) Figure 4 Ferrule end face angle for spherically polishe

31、d ferrules 3 Measurement by interferometer 3.1 General A typical interferometer configuration is shown in Figure 5. The apparatus consists of a suitable ferrule/connector holder, an optical interferometric system combined with a microscope and a camera. Figure 5 Interferometer 3.2 Ferrule/connector

32、holder This is a suitable device to hold the ferrule/connector in a fixed alignment position with respect to the optical axis of the interferometer. The holder is designed such that the portion of the ferrule closest to the end face is secured by the holder. The ferrule shall be aligned by holding i

33、t over a distance of at least twice the ferrule diameter. The ferrules axis should be adjustable in order to make it parallel to the optical axis of the interferometer. Alternatively, IEC Plane perpendicular to this fibre axis Ferrule Fibre axis Straight line tangent to the polished surface Holder F

34、errule Mirror Light source Beam splitter Object Lens Camera X Z IEC Y BS EN 61300-3-47:2014 8 IEC 61300-3-47:2014 IEC 2014 this can be carried out by positioning the reference mirror of the interferometer. For angled polished ferrules adjustments are necessary to align the polish angle axis with the

35、 optical axis of the interferometer. 3.3 Optical interferometric system A suitable optical interferometric system (for example a Michelson interferometer) displays an image with interference fringes of the ferrules end face. 3.4 Microscope with camera The image of the end face is projected on to the

36、 camera with a minimum field of view of 250 m. Software processes the image(s) and calculates the required parameters. 4 Requirements for the interferometer 4.1 XY calibration (radius of curvature) The interferometer shall have the ability to measure the radius of curvature with measurement uncertai

37、nty better than 0,1 mm for radii from 5 mm to 30 mm. See Annex A. 4.2 Z calibration (fibre height) The interferometer shall have the ability to measure the fibre height with measurement uncertainty better than 10 nm. See Annex A. 4.3 Alignment of ferrule axis with the interferometers optical axis (a

38、pex offset calibration) The interferometer shall have the ability to measure the apex offset with a maximum difference of less than 5 m between two measurements where the second measurement is made after rotating the ferrule by 180. See Annex A. NOTE This test is only possible with non-angled ferrul

39、es. 4.4 Tilt and key angle When measuring angled connectors, calibration of the holder position is required. Measurement of a flat polished ferrule should have a measurement uncertainty better than 0,1 for the key angle and 0,03 for the tilt angle. NOTE The key angle is the angular rotational misali

40、gnment between the ferrule mating surface of an angled end face connector, and its design orientation angle with respect to its key (see Annex B). 5 Measurement method 5.1 General For all measurements, the instrument should be adjusted such that a) a sample is placed in the measurement holder, b) th

41、e image of the ferrule end face in the fibre zone is seen on the monitor, c) the interference fringes appear on the ferrule end face, d) the ferrule axis is correctly aligned with the optical axis of the interferometer (“apex offset calibration”), e) all other instrument calibrations have been perfo

42、rmed, BS EN 61300-3-47:2014IEC 61300-3-47:2014 IEC 2014 9 f) the system is configured according to the type of measurement to be performed (e.g. PC or APC ferrule/connector). 5.2 Measurement regions Three regions shall be defined on the ferrule end face for the measurement (see Figure 6). a) Fitting

43、 region: the fitting region is set on the ferrule surface, and defined by a circular region having a diameter, D, minus a circular region having a diameter, E, (the extracting region). The fitting region shall be defined in order to cover the contact zone of the ferrule end face when the ferrule is

44、mated. b) Extracting region: the extracting region, which includes the fibre end face region and the adhesive region, is defined by a circle having a diameter E. c) Averaging region: the averaging region is set on the fibre surface, and defined by a circular region “having a diameter F”. This region

45、 is used for fibre height A averaging. The 3 regions should be concentric on the ferrule axis. For connectors with 125 m nominal fibre diameter and a radius of curvature of nominally 5 mm to 30 mm, the values of the diameters D, E and F are as follows: D = 250 m E = 140 m F = 50 m Ferrule endface Fe

46、rrule Fibre Adhesive D E Fibre endface Extracting region Fitting region Ferrule Fibre endface IEC F Averaging region Figure 6 Ferrule end face and measurement regions 5.3 Measurement procedure for the radius of curvature The following steps shall be taken: a) Measure the surface of the end face with

47、 the interferometer, recording the three-dimensional surface measurement data on its surface data processing unit (see Figure 7). b) Correct the surface data, taking into account the refractive indices and the absorption coefficients of the fibre and the ferrule. BS EN 61300-3-47:2014 10 IEC 61300-3

48、-47:2014 IEC 2014 c) Using the data from the fitting regions, calculate the “best fit” radius of curvature (Annex C). 5.4 Measurement procedure for the dome eccentricity (apex offset) The following steps shall be taken: a) Measure the surface of the end face with the interferometer, recording the th

49、ree-dimensional surface measurement data on its surface data processing unit (see Figure 7). b) Correct the surface data, taking into account the refractive indices and the absorption coefficients of the fibre and the ferrule. c) From the analysis of the interference image(s) the normal distance between the centre of the sphere (Annex C) fitted to the surface over the fitting region and the fibre axis shall be measured. This value corresponds