BS EN 61300-3-37-2005 Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Examinations and measurements - Endface angle of angle- p.pdf

1、BRITISH STANDARD BS EN 61300-3-37:2005 Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-37: Examinations and measurements Endface angle of angle-polished optical fibres The European Standard EN 61300-3-37:2005 has the status of a British Standar

2、d ICS 33.180.20 BS EN 61300-3-37:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 21 October 2005 BSI 21 October 2005 ISBN 0 580 46673 6 National foreword This British Standard is the official English language version of EN 61300-3-37:200

3、5. It is identical with IEC 61300-3-37:2005. The UK participation in its preparation was entrusted by Technical Committee 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 o

4、n this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement 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

5、by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does 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 immu

6、nity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in

7、the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 14, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No

8、. Date CommentsEUROPEAN STANDARD EN 61300-3-37 NORME EUROPENNE EUROPISCHE NORM July 2005 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050

9、Brussels 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61300-3-37:2005 E ICS 33.180.20 English version Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-37: Examinations

10、 and measurements Endface angle of angle-polished optical fibres (IEC 61300-3-37:2005) Dispositifs dinterconnexion et composants passifs fibres optiques - Mthodes fondamentales dessais et de mesures Partie 3-37: Examens et mesures Angle dextrmit des fibres optiques polissage dangle (CEI 61300-3-37:2

11、005) Lichtwellenleiter - Verbindungselemente und passive Bauteile Grundlegende Prf- und Messverfahren Teil 3-37: Untersuchungen und Messungen Endflchenwinkel schrg polierter optischer Fasern (IEC 61300-3-37:2005) This European Standard was approved by CENELEC on 2005-06-01. CENELEC members are bound

12、 to comply with the CEN/CENELEC Internal Regulations 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 Cen

13、tral Secretariat or to any CENELEC member. This 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 s

14、tatus as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,

15、 Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Foreword The text of document 86B/2106/FDIS, future edition 1 of IEC 61300-3-37, prepared by SC 86B, Fibre optic interconnecting devices and passive components, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel v

16、ote and was approved by CENELEC as EN 61300-3-37 on 2005-06-01. 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) 2006-04-01 latest date by which the national standards conflict

17、ing with the EN have to be withdrawn (dow) 2008-06-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61300-3-37:2005 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following

18、note has to be added for the standard indicated: IEC 61300-1 NOTE Harmonized as EN 61300-1:2003 (not modified). _ EN 61300-3-37:2005 2 CONTENTS 1 Scope.4 2 Normative references .4 3 General description 4 3.1 Method 1 Automatic interferometric method5 3.2 Method 2 Manual interferometric method7 4 App

19、aratus8 4.1 Method 1 Automatic interferometric method8 4.1.1 Microscope8 4.1.2 Angular micropositioner.8 4.1.3 Fibre holder.8 4.1.4 Plug holder9 4.1.5 Image analyser9 4.2 Method 2 Manual interferometric method9 4.2.1 Microscope9 4.2.2 Angular micropositioner.9 4.2.3 Fibre holder.10 4.2.4 Plug holder

20、10 4.2.5 Monitor for visual display.10 5 Procedure 10 5.1 Method 1 Automatic interferometric method10 5.1.1 Convex polished optical fibres .10 5.1.2 Flat polished optical fibres.11 5.2 Method 2 Manual interferometric method11 5.2.1 Convex polished optical fibres .11 5.2.2 Flat polished optical fibre

21、s.12 6 Details to be specified 12 6.1 Method 1 Automatic interferometric method12 6.2 Method 2 Manual interferometric method12 Bibliography13 Figure 1 Definition of optical fibre endface angle for polished convex (a) and flat (b) endfaces.5 Figure 2 Example of the set-up for angle measurement by mea

22、ns of an automated interferometer .6 Figure 3 Example of the interferometric pattern of a convex polished optical fibre6 Figure 4 Example of the interference pattern of a flat angled polished optical fibre 7 Figure 5 Example of the interference pattern of a convex polished optical fibre adjusted for

23、 measurement using method 28 Figure 6 Example of apparatus for the angle measurement by method 29 3 EN 61300-3-37:2005FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND MEASUREMENT PROCEDURES Part 3-37: Examinations and measurements Endface angle of angle-polished optical fibr

24、es 1 Scope This part of IEC 61300 describes methods to measure the endface angle of flat or convex angle-polished optical fibres. The primary attributes addressed include endface angle, key angle and radius of curvature. 2 Normative references The following referenced documents are indispensable for

25、 the application 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. IEC 61300-3-17, Fibre optic interconnecting devices and passive components Basic test and measurement pro

26、cedures Part 3-17: Examination and measurements Endface angle of angle-polished ferrules IEC 61754-19, Fibre optic connector interfaces Part 19: Type SG connector family ISO 2538, Geometrical Product Specifications (GPS) Series of angles and slopes on prisms 3 General description Optical fibres are

27、frequently cleaved and polished to achieve a suitable endface surface topography for interfacing to other fibres, optical components, transmitters or receivers. Such interfaces may occur in free space or by physical contact. Often, particularly in the case of ferrule-less fibre optic connectors, rad

28、iused or angled radiused endfaces optimise the fibre-to- fibre physical contact characteristics. The optical fibre endface angle () for flat endface angle-polished fibres is defined as the angle between the plane perpendicular to the axis of the fibre and the plane of the flat endface. The endface a

29、ngle () for spherically polished angled endface fibres is the angle between the plane perpendicular to the axis of the fibre and the straight-line tangent to the polished surface at the fibre core and going to the nominal angle direction. See Figure 1. EN 61300-3-37:2005 4 5 Fibre a) b) Straight lin

30、e tangent to the polished surface Straight line tangent to the polished surface Fibre axis Fibre axis Plane perpendicular to the fibre axis Plane perpendicular to the fibre axis Fibre IEC 662/05 IEC 661/05 Figure 1 Definition of optical fibre endface angle for polished convex (a) and flat (b) endfac

31、es Two methods are described for measuring the optical fibre endface angle: method 1 automatic interferometric method (reference method); method 2 manual interferometric method; 3.1 Method 1 Automatic interferometric method Due to its greater accuracy, method 1 is considered the reference model. In

32、this method the optical fibre endface is placed in a tiltable micropositioner under a microscope with interferometric capability. NOTE A fixed holder at the nominal value of the angle to be measured may be used, but in this case the alignment procedure described is not applicable and it is necessary

33、 to use a reference angled fibre, measured by other methods. EN 61300-3-37:2005 6 Interferometric video microscope PC based fringe interpretation Fibre under test Tilt micrometer XYZ positioner Angle = xx degrees Radius = xx mm Key angle = xx degrees Monitor to view fibre endface interferogram and d

34、isplay the analysis results IEC 663/05 Figure 2 Example of the set-up for angle measurement by means of an automated interferometer Phase differences between the reference wavefront and the wavefront from the surface of the optical fibre under test create a fringe pattern. The optical fibre is tilte

35、d by a micropositioner at the nominal value ( 0 ) of the angle that has to be measured. For convex polished optical fibres, the radius of curvature (R) and the apex offset component (E x ) in the direction of the angle (), are measured from the analysis of the interferometric pattern (see Figure 3 a

36、nd Equation (1). The value of the angle is evaluated from the values of R, E x , and the tilt offset of the fibre holder. The other component of apex offset, E y may be evaluated to quantify any rotational misalignment of the endface, which is commonly referred to as key angle.Fringes centre (Polish

37、 vertex) Fibre centre Fringes E YE XIEC 664/05 Figure 3 Example of the interferometric pattern of a convex polished optical fibre EN 61300-3-37:2005For flat polished optical fibres the angle is evaluated from the frequency of the interferometric fringes in the angle direction (see Figure 4), from th

38、e number of waves in the length unit (1/). It should be noted that often the fringes will not line up exactly with the tilt axis, indicating a component of rotational misalignment of the endface, which is commonly referred to as key angle. IEC 665/05Figure 4 Example of the interference pattern of a

39、flat angled polished optical fibre 3.2 Method 2 Manual interferometric method As in method 1, the optical fibre endface is placed in a tiltable micropositioner under a microscope with interferometric capability. However, in this method the optical fibre is tilted by a micropositioner until the surfa

40、ce of the endface is normal to the optical axis of the interferometer: this occurs when the real value of the angle is reached. In the case of a convex polished fibre endface, this position is reached when the interference rings and the fibre are both symmetrical to the rotation axis (see Figure 5).

41、 If key angle also exists, it may only be possible to achieve symmetry in the tilt axis. In the case of flat polished optical fibres the position is reached when the interference fringes disappear or if key angle also exists, are at a minimum number. The endface angle of the optical fibre can be rea

42、d on the dial of the tilt micropositioner. 7 EN 61300-3-37:2005 Polished 125 m diameter fibre with 2 circular fringes across fitting region D D Polished fibre endface Radius or curvature Fibre IEC 666/05 Figure 5 Example of the interference pattern of a convex polished optical fibre adjusted for mea

43、surement using method 2 4 Apparatus 4.1 Method 1 Automatic interferometric method The apparatus is shown in Figure 2. For method 1, the apparatus consists of the following elements. 4.1.1 Microscope A microscope with interferometric capability associated with a video camera for the image acquisition

44、. 4.1.2 Angular micropositioner An angular micropositioner with a resolution better than 0,05. 4.1.3 Fibre holder A suitable fixture such as a V-groove according to ISO 2538 and IEC 61300-3-17 or a precision alignment sleeve to hold the ferrule in a fixed position such that the key angle register is

45、 maintained relative to the reference surface defined by the connector interface standard (IEC 61754-19). 8 EN 61300-3-37:2005 9 4.1.4 Plug holder A mechanical fixture able to hold the plug such that the key angle register is maintained relative to the reference surface defined by the connector inte

46、rface standard (IEC 61754-19). 4.1.5 Image analyser An analyser system able to evaluate from the interferometric image(s) the radius of curvature, the dome offset component along the angle direction, and from these, calculate the value of the angle by Formula (1). The monitor shall display the measu

47、red surface with the interferometric pattern and the analysis data. 4.2 Method 2 Manual interferometric method The apparatus is shown in Figure 6. For method 2, the apparatus consists of the following elements. Interferometric video microscope Fibre under test Tilt micrometer XYZ positioner Monitor

48、to view fibre endface interferogramIEC 667/05 Figure 6 Example of apparatus for the angle measurement by method 2 4.2.1 Microscope A microscope with interferometric capability, interfacing with a video camera for image acquisition, and a display monitor. 4.2.2 Angular micropositioner An angular micr

49、opositioner with a resolution better than 0,05. EN 61300-3-37:20054.2.3 Fibre holder A suitable fixture such as a V-groove according to ISO 2538 and IEC 61300-3-17 or a precision alignment sleeve to hold the ferrule in a fixed position such that key angle register is maintained relative to the reference surface defined by th