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、55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Thu Apr 12 06:38:18 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBS EN 61755-2-2:2006This British Standard was published und
3、er the authority of the Standards Policy and Strategy Committee on 31 January 2007 BSI 2007ISBN 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 preparat
4、ion was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/2, Fibre 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 necessa
5、ry provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Thu Apr 12 06:38:18 GMT+00:00 2007, Uncontrolled Copy
6、, (c) BSIEUROPEAN STANDARD EN 61755-2-2 NORME EUROPENNE EUROPISCHE NORM November 2006 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Bru
7、ssels 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 optic connector optical interfaces Part 2-2: Optical interface standard single mode angled physically contacting fibre
8、s (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 61755-2-2:2006) Optische Schnittstellen von Lichtwellenleiter-Steckverbindern Teil 2-2: Optische Schnittstellen von abgeschrgten E
9、inmodenfasern 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 Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard
10、 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. This European Standard exists in three official versions (English, French, German). A version in any other l
11、anguage 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 members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech Republic, Denmark,
12、Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: Wang Bin, na, Thu Apr 12 06:38:18 GMT+00:00 200
13、7, Uncontrolled Copy, (c) BSIForeword 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 approved by CENELEC as EN 61
14、755-2-2 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 EN have to be withdrawn (dow
15、) 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 Licensed Copy: Wang Bin, na, Thu Apr 12 06:38:18 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 3 EN 61755-2-2:2006 F
16、IBRE OPTIC CONNECTOR OPTICAL INTERFACES Part 2-2: Optical interface 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 random
17、ly mated pair of fibres. Performance grades are classified into four 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 a
18、ngled contacting fibres only. Performance grades for PC connectors 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 f
19、igures and tables give the criteria for meeting the performance grades 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 res
20、ults. Licensed Copy: Wang Bin, na, Thu Apr 12 06:38:18 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 61755-2-2:2006 4 3.1 Attenuation grades and criteria 3.1.1 Design curves Considering a beam with a Gaussian distribution, the coupling efficiency, , of two single mode fibres is given by Equation (1).
21、 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 index 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
22、 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 allowed range of the lateral and angular misalignment. The design curves represent the determination of the parameters under a worst case mismatch of
23、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 specification 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
24、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 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 d
25、B Grade C 0,5 dB Grade D 1,0 dB IEC 1422/06Figure 1 Maximum lateral offset and angular misalignment at = 1 310 nm Licensed Copy: Wang Bin, na, Thu Apr 12 06:38:18 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 5 EN 61755-2-2:2006 The attenuation on each curve has the shown fixed value Equation 1: Attenu
26、ation 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 the fibre core, 1is the transmit fibre mode field rad
27、ius, 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 (nominal) a8 degrees Scratches 1 m in core zone b 5 a
28、A 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 incidence by maximum parameter values for angular misalignme
29、nt 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, MFD selected from Table 3) n1nominal index of refract
30、ion 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 that this reflection has a negligible angular depend
31、ence for 10, Fresnel reflection for normal incidence was applied. b Scratches 1 m have no influence on the performance of APC connectors. Licensed Copy: Wang Bin, na, Thu Apr 12 06:38:18 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 61755-2-2:2006 6 Bibliography IEC 61755-2-1, Fibre optic connector o
32、ptical interfaces - Part 2-1: Optical interface 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 fibre
33、s _ NOTE Harmonized as EN 61755-2-1:2006 (not modified). Licensed Copy: Wang Bin, na, Thu Apr 12 06:38:18 GMT+00:00 2007, Uncontrolled Copy, (c) BSIblankLicensed Copy: Wang Bin, na, Thu Apr 12 06:38:18 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBS EN 61755-2-2:2006BSI389 Chiswick High RoadLondonW4 4A
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