1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58single mode non-angled physically contacting fibresThe European Standard EN 61755-2-1:2006 has the
2、status of a British StandardICS 33.180.20Fibre optic connector optical interfaces Part 2-1: Optical interface standard BRITISH STANDARDBS EN 61755-2-1:2006BS EN 61755-2-1:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 September 2006 B
3、SI 2006ISBN 0 580 49204 4Amendments issued since publicationAmd. No. Date CommentsThis 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 cannot confer immunity from legal obligation
4、s.National forewordThis British Standard was published by BSI. It is the UK implementation of EN 61755-2-1:2006. It is identical with IEC 61755-2-1:2006. The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/2, Fibre optic interconn
5、ecting devices and passive components.A list of organizations represented on GEL/86/2 can be obtained on request to its secretary.EUROPEAN STANDARD EN 61755-2-1 NORME EUROPENNE EUROPISCHE NORM August 2006 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation
6、Electrotechnique 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 61755-2-1:2006 E ICS 33.180.20 English version Fibre
7、 optic connector optical interfaces Part 2-1: Optical interface standard single mode non-angled physically contacting fibres (IEC 61755-2-1:2006) Interfaces optiques de connecteurs pour fibres optiques Partie 2-1: Interfaces optiques pour fibres unimodales en contact physique sans angles (CEI 61755-
8、2-1:2006) Optische Schnittstellen von Lichtwellenleiter-Steckverbindern Teil 2-1: Optische Schnittstelle von nicht abgeschrgten Einmodenfasern mit physikalischem Kontakt (IEC 61755-2-1:2006) This European Standard was approved by CENELEC on 2006-08-01. CENELEC members are bound to comply with the CE
9、N/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 Central Secretariat or to
10、 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 status as the official
11、versions. CENELEC 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, Slov
12、akia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Foreword The text of document 86B/2305/FDIS, future edition 1 of IEC 61755-2-1, prepared by SC 86B, Fibre optic interconnecting devices and passive components, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vot
13、e and was approved by CENELEC as EN 61755-2-1 on 2006-08-01. 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) 2007-05-01 latest date by which the national standards conflicting
14、 with the EN have to be withdrawn (dow) 2009-08-01 _ Endorsement notice The text of the International Standard IEC 61755-2-1:2006 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following note has to be added for the standard in
15、dicated: IEC 60793-2-50 NOTE Harmonized as EN 60793-2-50:2004 (not modified). _ 2 EN 61755-2-1:2006FIBRE OPTIC CONNECTOR OPTICAL INTERFACES Part 2-1: Optical interface standard single mode non-angled physically contacting fibres 1 Scope This part of IEC 61755 defines a set of prescribed conditions t
16、hat must be maintained in order to satisfy the requirements of attenuation and return loss performance in a randomly mated pair of fibres considering a beam with a Gaussian distribution of light intensity over the considered MFD. Performance grades are classified into four categories for attenuation
17、 and return loss measurements. 2 Performance grades Proposed performance grades for PC polished connectors are given in Tables 1 and 2. The performance grades based on return loss are for non-angled connectors only. Performance grades for APC connectors are defined separately in IEC 61755-2-2. Table
18、1 Single mode attenuation grades at 1 310 nm and 1 550 nm (dB) Attenuation grade Attenuation ( 97 %)aMean A bB 0,25 0,12 C 0,50 0,25 D 1,0 0,50 aThe probability of a random mated connector set meeting or exceeding the specified level of attenuation will be 97%. b Reserved for future application. Tab
19、le 2 Single mode return loss grades at 1 310 nm and 1 550nm (dB) Return loss grade Return loss (mated) 1 a2 45 3 35 4 26 a Not applicable to this document 3 EN 61755-2-1:20063 Criteria for a fit within performance grades Figures 1 to 3 and Tables 3 and 4 below give the criteria for meeting the perfo
20、rmance 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 presented in 3.1 and 3.2 of this document. 3.1 Attenuation grades and criteria Consi
21、dering 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 index of refraction as a
22、function of the nominal wavelength of the light used MFD m n0 (core) Fibre type Nominal wavelength nm Min. Max. 1 310 8,8 9,6 1,452 0 Dispersion unshifted Fibre 1 550 9,6 11,2 1,449 3 The attenuation (also referred to as insertion loss, IL, or coupling efficiency) of the fibres equals combined.The d
23、efinition of performance grades is based on a statistical approach defining parameter values to reach the given random attenuation in 97 % of the connections. This performance is reached considering the following assumptions: normal distribution of MFD within the range defined in Table 3 at nominal
24、value for wavelength. Lateral and angular misalignment of the two randomly mated connectors are assumed to be statistically distributed within the specific ranges of parameter values E and F. The design curves given in Figure 1 each represent maximum allowable combinations of a given specific latera
25、l offset and an accordant angular misalignment to not exceed the specified attenuation of any single considered connection. The shown 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,
26、8/9,6 m and a wavelength of 1 310 nm. These mode field diameter ranges are selected within the IEC 60793-2-50 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 Table 3, but the design curves ar
27、e not shown in Figure 1. 4 EN 61755-2-1:2006Lateral offset m Angular misalignmentdeg 0,25 dB 0,5 dB 1,0 dB 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 IEC 1310/06 Figur
28、e 1 Lateral offset and angular misalignment versus attenuation, combined, for a typical dispersion unshifted single mode fibre Attenuation combinedis expressedas in Equation 1 below. where d is the total lateral offset is the angular misalignment between fibre cores is the wavelength of transmitted
29、light in vacuum n0 is the index of refraction of the fibre core 1is the transmit fibre mode field radius 2is the receive fibre mode field radius ()()()()()+=22122212222022122222122212sin22exp2log10 ndcombined(1) 5 EN 61755-2-1:20063.2 Return loss grades and criteria Table 4 Examples of allowable end
30、 face condition versus return loss single mode fibre Return loss 45 dB Return loss 35 dB Return loss 26 dB Typical final polish method Silicon oxide + slurry Alumina + water Diamond + slurry Scratches (within zone Aa) 0 2 (1 m) Multiple (1 m) Pits (within zone Aa)0 3 (1 m) 3 (5 m) Contamination (zon
31、e Aa) None None None NOTE 1 No cracks are allowed in the fibre NOTE 2 Scratches are detected using IEC PAS 61300-3-35 NOTE 3 The reference connector used for return loss measurements needs to be of the same or better category and free of defects on the core zone AaCore zone A is defined as the area
32、on the fibre core bounded by a circle of 25 m diameter and centered on the true centre of the fibre. Return loss for convex polished connectors is expressed as RL below: where RL is the calculated return loss value from R where: RL = 10 log10 R E = sin1sin2F = cos1cos2 G =cos1sin2H = sin d1cos d21=
33、2n1d1/ 2= 2n2d2/ n1 and d1are the refractive index and thickness of the high index layer of connector 1 n2 and d2are the refractive index and thickness of the high index layer of connector 2 n0is the refractive index of glass fibre core (As for n1, n2, n0, d1 andd2, refer to Figure 2.)21120222020122
34、10211202220201221*2*+=HnnnGnnnEnnnnnFnHnnnGnnnEnnnnnR(2) 6 EN 61755-2-1:2006n0n0n2d1d2n1 IEC 1311/06 Figure 2 Convex polished connector end face model under compressive load 35 dB 26 dB 45 dB High index layer refractive index Thicknessofhighindex layer m 1,455 1,460 1,465 1,470 1,475 1,480 1,485 1,4
35、90 0 0,02 0,04 0,06 0,08 0,10 0,12 IEC 1312/06 Figure 3 High index layer refractive index and thickness versus return loss for a typical non-dispersion shifted single mode fibre Note that in both of the above cases it is assumed that fibre end face separation is either zero or that an intermediate h
36、omogeneous medium is present between the fibre end faces that has a maximum attenuation contribution of 0,05 dB. 7 EN 61755-2-1:2006Bibliography IEC 60793-2-50, Optical fibres Part 2-50: Product specifications Sectional specification for class B single-mode fibres IEC 61755-2-2, Fibre optic connecto
37、r optical interfaces Part 2-2: Optical interface standard single mode non-angled physically contacting fibres CEI PAS 61300-3-35, Fibre optic interconnecting devices and passive components basic test and measurement procedures Part 3-35: Examinations and measurements Fibre optic cylindrical connecto
38、r endface visual inspection _ 8 EN 61755-2-1:2006blankBS EN BSI389 Chiswick High RoadLondonW4 4AL61755-2-1:2006BSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international le
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