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

1、 IEC 61300-3-47 Edition 1.0 2014-07 INTERNATIONAL STANDARD 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 IEC 61300-3-47:2014-07(e

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11、300-3-47 Edition 1.0 2014-07 INTERNATIONAL STANDARD 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 INTERNATIONAL ELECTROTECHNICAL

12、COMMISSION Q ICS 33.180.20 PRICE CODE ISBN 978-2-8322-1708-5 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. colour inside 2 IEC 61300-3-47:2014 IEC 2014 CONTENTS FOREWORD . 3 1 Scope 5 2 Term

13、s and definitions 5 3 Measurement 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 A

14、lignment of ferrule axis with 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 o

15、ffset) 10 5.5 Measurement 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”) . 1

16、4 A.4 Tilt and key angle . 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

17、 Apex offset of a spherically 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

18、 surface 11 Figure 8 Fitting 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

19、 convex polished ferrule . 15 IEC 61300-3-47:2014 IEC 2014 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ 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

20、 using interferometry FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning

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29、ising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention i

30、s drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61300-3-47 has been prepared by subcommittee 86B: Fibre optic interconnecting

31、devices and passive components, of IEC technical committee 86: Fibre optics. This standard merges IEC 61300-3-15, IEC 61300-3-16, IEC 61300-3-17 and IEC 61300-3-23. After publication of this standard IEC 61300-3-15, IEC 61300-3-16, IEC 61300-3-17 and IEC 61300-3-23 will be withdrawn. 4 IEC 61300-3-4

32、7:2014 IEC 2014 The text of this standard is based on the following documents: FDIS Report on voting 86B/3773/FDIS 86B/3805/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in acc

33、ordance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 61300 series, published under the general title, Fibre optic interconnecting and passive components Basic test and measurement procedures, can be found on the IEC website. The committee has decided that the contents of this

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36、C 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 61300 describes a procedure t

37、o 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 radius of curvature B radius

38、 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 curvature of a spherically polis

39、hed 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 6 IEC 61300-3-47:2014 IEC 2014 Apex or highest point on

40、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 ferrule end face (see Annex C) Note 1 to entry: It

41、 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 fibre protrusion (see Figure 3b). Fibre height V

42、irtual 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 IEC 61300-3-47:2014 IEC 2014 7 2.4 end face angle angle ( ) between the

43、 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 polished ferrules 3 Measurement by interferometer 3.1 General A typical inte

44、rferometer 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 holder This is a suitable device to hold the ferrule/connector in a f

45、ixed 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 it over a distance of at least twice the ferrule diameter. The ferrule

46、s 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 Ferrule Mirror Light source Beam splitter Object Lens Camera X Z IEC Y

47、 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 optical axis of the interferometer. 3.3 Optical interferometric system A suitable optical

48、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 camera with a minimum field of view of 250 m. Software processes the image(s) and calculat

49、es 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 uncertainty 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 Alignm