1、BRITISH STANDARDBS EN 61755-2-2:2006Fibre optic connector optical interfaces Part 2-2: Optical interface standard single mode angled physically contacting fibresThe European Standard EN 61755-2-2:2006 has the status of a British StandardICS 33.180.20g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g
2、55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 61755-2-2:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2007 BSI 2007
3、ISBN 978 0 580 50043 5National forewordThis British Standard was published by BSI. It is the UK implementation of EN 61755-2-2:2006. It is identical with IEC 61755-2-2:2006.The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/2, Fi
4、bre optic interconnecting devices and passive components.A list of organizations represented on GEL/86/2 can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance w
5、ith a British Standard cannot confer immunity from legal obligations. Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARD EN 61755-2-2 NORME EUROPENNE EUROPISCHE NORM November 2006 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation E
6、lectrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61755-2-2:2006 E ICS 33.180.20 English version Fibre
7、optic connector optical interfaces Part 2-2: Optical interface standard single mode angled physically contacting fibres (IEC 61755-2-2:2006) Interfaces optiques de connecteurs pour fibres optiques Partie 2-2: Interfaces optiques pour fibres unimodales en contact physique avec angle (CEI 61755-2-2:20
8、06) Optische Schnittstellen von Lichtwellenleiter-Steckverbindern Teil 2-2: Optische Schnittstellen von abgeschrgten Einmodenfasern mit physikalischem Kontakt (IEC 61755-2-2:2006) This European Standard was approved by CENELEC on 2006-10-01. CENELEC members are bound to comply with the CEN/CENELEC I
9、nternal 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 Central Secretariat or to any CENELE
10、C 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 status as the official versions. C
11、ENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slove
12、nia, Spain, Sweden, Switzerland and the United Kingdom. Foreword The text of document 86B/2317/FDIS, future edition 1 of IEC 61755-2-2, 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 a
13、pproved by CENELEC as EN 61755-2-2 on 2006-10-01. 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) 2007-07-01 latest date by which the national standards conflicting with the E
14、N have to be withdrawn (dow) 2009-10-01 _ Endorsement notice The text of the International Standard IEC 61755-2-2:2006 was approved by CENELEC as a European Standard without any modification. _ EN 61755-2-2:2006 2 3 EN 61755-2-2:2006 FIBRE OPTIC CONNECTOR OPTICAL INTERFACES Part 2-2: Optical interfa
15、ce standard single mode angled physically contacting fibres 1 Scope The document defines a set of prescribed conditions that must be maintained in order to satisfy the requirements of attenuation and return loss performance in a randomly mated pair of fibres. Performance grades are classified into f
16、our categories for attenuation and one for return loss measurements. 2 Performance grades Proposed performance grades for APC polished contacting fibres are given in Tables 1 and 2. The performance grades based on return loss are for angled contacting fibres only. Performance grades for PC connector
17、s are defined separately in IEC 61755-2-1. Table 1 Single mode attenuation grades at 1 310 nm and 1 550 nm Grade Attenuation (max) 97 % Attenuation (mean) AaB 0,25 dB 60 55 3 Criteria for a fit within performance grades The following figures and tables give the criteria for meeting the performance g
18、rades listed above. The parameters chosen for the criteria definition are based on the degree of significance in affecting the performance under test. The criteria selected are based on the theoretical model as well as experimental results. EN 61755-2-2:2006 4 3.1 Attenuation grades and criteria 3.1
19、.1 Design curves Considering a beam with a Gaussian distribution, the coupling efficiency, , 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 3. Table 3 Mode field diameter and fibre core nominal ind
20、ex of refraction as a function of the wavelength of the light used MFD m Fibre type Wavelength nm Min. Max. n0 (core) Dispersion Unshifted Fibre 1 310 1 550 8,8 9,6 9,6 11,2 1,452 0 1,449 3 The attenuation of the fibres is then given by combined. The design curves given in Figure 1 depict the allowe
21、d range of the lateral and angular misalignment. The design curves 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. 8,8/9,6. These mode field diameter ranges are selected within the IEC family specif
22、ication for single mode non-dispersion shifted fibres as given in Table 3. The equation is also applicable to 1 550 nm, using the parameters in Table 3, but the design curves are not shown in Figure 1. Total lateral offset m Totalangular misalignmentdeg 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1,0 1,1
23、1,2 1,3 1,4 1,5 1,6 1,7 1,8 1,9 2,0 2,1 2,2 2,3 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1,0 1,1 1,2 1,3 1,4 1,5 1,6 1,7 1,8 1,9 2,0 Grade B 0,25 dB Grade C 0,5 dB Grade D 1,0 dB IEC 1422/06Figure 1 Maximum lateral offset and angular misalignment at = 1 310 nm 5 EN 61755-2-2:2006 The attenuation on eac
24、h curve has the shown fixed value Equation 1: Attenuation combined()()( )()()+=22122212222022122222122212om22exp2log10 sinndbinedcwhere 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 t
25、he fibre core, 1is the transmit fibre mode field radius, 2is the receive fibre mode field radius. 3.2 Return loss grade and criteria Table 4 Performance grade for return loss and criteria based on end face condition Return loss grade 1 Return loss (RL) 55 dB (unmated) 60 dB (mated) Polishing angle (
26、nominal) a8 degrees Scratches 1 m in core zone b 5 aA nominal polishing angle of 8 degrees was chosen in order to guarantee the required return loss performance considering worst case return loss ( = 1 550 nm, unmated interface, minimum MFR) calculated with Equation 2; influence of angle of incidenc
27、e by maximum parameter values for angular misalignment and apex defined in IEC 61755-3-2; ()()022211RL2log(e)10)RL( += n+=221210log10RLnnnnEquation 2: Return loss RL depending on polishing angle (unmated interface) )angle of incidence = polishing angle (rad) 1MFR of transmitting fibre (m) (=MFD/2, M
28、FD selected from Table 3) n1nominal index of refraction for transmitting fibre (selected from Table 3) n2nominal index of refraction for receiving medium (=1 for unmated interface) Wavelength of transmitted light in vacuum (m) (selected from Table 3) RL0Reflection at the unmated interface. Assuming
29、that this reflection has a negligible angular dependence for 10, Fresnel reflection for normal incidence was applied. b Scratches 1 m have no influence on the performance of APC connectors. EN 61755-2-2:2006 6 Bibliography IEC 61755-2-1, Fibre optic connector optical interfaces - Part 2-1: Optical i
30、nterface standard single mode non-angled physically contacting fibres IEC 61755-3-2, Fibre optic connector optical interfaces - Part 3-2: Optical interface, 2,5 mm and 1,25 mm diameter cylindrical full zirconia ferrules for 8 degrees angled-PC single mode fibres _ NOTE Harmonized as EN 61755-2-1:200
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