1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58components Basic test and measurement procedures Part 3-24: Examinations and measurements Keying ac
2、curacy of optical connectors for polarization maintaining fibreThe European Standard EN 61300-3-24: 2007 has the status of a British StandardICS 33.180.20Fibre optic interconnecting devices and passive BRITISH STANDARDBS EN 61300-3-24:2007BS EN 61300-3-24:2007This British Standard was published unde
3、r the authority of the Standards Policy and Strategy Committee on 30 March 2007 BSI 2007ISBN 978 0 580 50305 4Amendments issued since publicationAmd. No. Date Commentsits secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its
4、correct application.Compliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard was published by BSI. It is the UK implementation of EN 61300-3-24:2007. It is identical with IEC 61300-3-24:2006. It supersedes BS EN 61300-3-24:2000 which is
5、withdrawn.The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/2, Fibre optic interconnecting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.A list of organizations represented on GEL/86/2 can be obtained on request to EUROPEAN STANDARD EN 61300-3
6、-24 NORME EUROPENNE EUROPISCHE NORM February 2007 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2007 CENELEC - All rights of e
7、xploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61300-3-24:2007 E ICS 33.180.20 Supersedes EN 61300-3-24:2000English version Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 3-24: Examinations and m
8、easurements - Keying accuracy of optical connectors for polarization maintaining fibre (IEC 61300-3-24:2006) Dispositifs dinterconnexion et composants passifs fibres optiques - Mthodes fondamentales dessais et de mesures - Partie 3-24 : Examens et mesures - Prcision de dtrompage des connecteurs opti
9、ques pour fibres de maintien de la polarisation (CEI 61300-3-24:2006) Lichtwellenleiter - Verbindungselemente und passive Bauteile - Grundlegende Prf- und Messverfahren - Teil 3-24: Untersuchungen und Messungen - Genauigkeit der Auenzentrierung von optischen Steckverbindern fr polarisationserhaltend
10、e Fasern (IEC 61300-3-24:2006) This European Standard was approved by CENELEC on 2006-11-01. 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 without any alteration. Up-to-
11、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 language made by translation und
12、er 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, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Fra
13、nce, 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. EN 61300-3-24:2007 2 Foreword The text of document 86B/2374/FDIS, future edition 2
14、of IEC 61300-3-24, 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 61300-3-24 on 2006-11-01. This European Standard supersedes EN 61300-3-24:2000. Specific tec
15、hnical changes from EN 61300-3-24:2000 include the addition of specifications for the apparatus dynamic range, detector linearity and polarizer/analyzer extinction ratio, an alternative expression of total extinction ratio, and revision of Annex A. The following dates were fixed: latest date by whic
16、h the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2007-08-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2009-11-01 _ Endorsement notice The text of the International Standard I
17、EC 61300-3-24:2006 was approved by CENELEC as a European Standard without any modification. _ 3 EN 61300-3-24:2007 CONTENTS 1 Scope and object4 2 General description 4 3 Apparatus.4 4 Procedure 5 5 Details to be specified 6 Annex A (informative) Keying accuracy for PM fibre7 Annex B (informative) Ca
18、lculated extinction ratio versus measured values 8 Bibliography .10 Figure 1 Apparatus of keying accuracy and extinction ratio measurement5 Figure 2 First part of the measurement procedure.5 Figure 3 Keying accuracy.6 Figure A.1 Geometrical axis of PM fibre7 Figure B.1 Calculated extinction ratio ve
19、rsus measured values .9 Figure B.2 Calculated extinction ratio for a connection of two PM fiber sections. .9 EN 61300-3-24:2007 4 FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND MEASUREMENT PROCEDURES Part 3-24: Examinations and measurements Keying accuracy of optical conne
20、ctors for polarization maintaining fibre 1 Scope This part of IEC 61300 provides a method to measure the keying accuracy of a polarization maintaining fibre connector. 2 General description Optical fibre connectors for polarization maintaining fibre (PMF) shall align the birefringence axes of the tw
21、o mating fibres. The keying accuracy of PM connector plugs should be specified to realize PMF connection with high extinction ratio propagation (see annex A). The extinction ratio of PMF itself is generally over 40 dB for fibres several metres in length. The extinction ratio achieved with the PMF co
22、nnectors is lower than that due to the PM fibre alone because of the following reasons: a) in the termination: after the PM fibre has been terminated into the ferrule, some residual stress causes the extinction ratio to decrease; b) angular misalignment of the axes of birefringence: the angular misa
23、lignment of the polarization axes at the connection point affects the extinction ratio. To evaluate the influence of the second factor of the misalignment angle of the polarization axes at the connection point, measurement of the keying accuracy and the extinction ratio is very important (see annex
24、B). 3 Apparatus The apparatus and arrangement necessary to make this measurement is shown in Figure 1. The material needed consists of the following: a) an optical source S with known characteristics (wavelength, spectral width, etc.) and a compatible detector D. A Fabry-Perot laser or low-coherence
25、 source (for example SLD) is suitable for this measurement; b) an in-line polarization assembly including a polarizer P1,a quarter-wave retardation plate and a polarizer P2 in an expanded beam system formed by two lenses L1 and L2. The quarter-wave plate converts the state of polarization SOP from l
26、inear to circular and the polarizer converts the SOP from circular to linear. With this combination of elements, linearly polarized light with the same optical power will be produced regardless of the plane of polarization. NOTE In the case of an unpolarized light source such as an LED, P1 and the q
27、uarter wave retardation plate are not necessary. 5 EN 61300-3-24:2007 c) two optical receptacles Re; d) an analyzer A to determine the extinction ratio of light; e) the dynamic range of the system shall be 5 dB better than the value to be measured; f) detector linearity to be at least 0,1 dB per dec
28、ade; g) extinction ratio of polarizer P2 and analyzer shall be at least 5 dB better than the value to be measured. S L1 P1 P2 L2 D 1/4 Single-mode fibre Test patch cord A ReRe IEC 1979/06Figure 1 Apparatus of keying accuracy and extinction ratio measurement 4 Procedure 4.1 The first part of this pro
29、cedure sets a uniform linearly polarized light for any direction at the output of the lens L2. With the measurement arrangement set up as in Figure 2, S L1 P1 P2 L2 D 1/4 Single-mode fibre IEC 1980/06 Figure 2 First part of the measurement procedure a) remove the polarizer P2 and adjust the polarize
30、r P1 to get a maximum measurement at the detector; b) insert the polarizer P2 and adjust the quarter-wave retardation plates to get a uniform measurement at the detector for every direction of polarizer P2. 4.2 The next part of this procedure measures the angle of polarization axis and the extinctio
31、n ratio of the test patch cord. a) Place the patch cord to be tested between two receptacles (Re) as shown in Figure 1. b) Adjust analyzer A to get a minimum measurement at the detector. c) Adjust polarizer P2 to get a minimum measurement at the detector. d) Repeat steps b) and c) until the lowest m
32、easurement attainable is achieved. Record this measurement as Dmin(dBm). e) Rotate the analyzer to 90 from a minimum reading point at the detector. Record this reading as Dmax(dBm). The extinction ratio of the test patch cord is given by Dmax Dmin(dB). The angle of polarization axis of each plug of
33、the test patch cord is the angle of the polarizer P2 and the analyzer A, respectively. f) Keying accuracy is obtained as a mismatch angle between the obtained polarization axis and the key groove direction of the receptacle for each plug end as shown in Figure 3. EN 61300-3-24:2007 6 Polarization ax
34、is Mismatch angle Key groove IEC 1981/06 Figure 3 Keying accuracy 5 Details to be specified The following details, as applicable, shall be specified in the relevant specification: a) optical source S including spectral width or coherence length, stability and peak wave-length; b) detector spectral r
35、esponse; c) deviations from test procedure. 7 EN 61300-3-24:2007 Annex A (informative) Keying accuracy for PM fibre The axis of birefringence of PM fibre may be found by observing its physical structure. Figure 1 shows the relationship between the geometrical axis of PM fibre and the plug key. The s
36、low axis of the fibre structure is usually aligned to the plug key direction as shown in Figure A.111). For some PM fibres, it is easier to observe the geometrical axis by structure than to locate the polarization axis by the procedure in the main document. Fast axis Slow axis PM Structure PM fibre
37、Ferrule Key Plug IEC 1982/06 Figure A.1 Geometrical axis of PM fibre 1)Figures in square brackets refer to the bibliography. EN 61300-3-24:2007 8 Annex B (informative) Calculated extinction ratio versus measured values The extinction ratio of PMF itself is generally over 40 dB for several metres in
38、length. The extinction ratios of the PMF connectors are lower than the initial value for the following reasons. a) Termination After PM fibre has been glued to the ferrule, some residual stress causes the extinction ratio to decrease. A typical patch cord with PMF has an extinction ratio between 25
39、dB and 35 dB. If two PMF patch cords are connected, the minimum total extinction ratio will be ERt min= 10 log (10ER1/10+ 10ER2/10)(B.1)where ER1and ER2are the extinction ratios in decibels of each PMF patch cord 1. The total extinction ratio caused by termination ERtcannot determine a fixed value b
40、ecause ERtvaries from ER1to ERt min along the fibre length. b) Misalignment angle of the axes of birefringence The misalignment angle of polarization axes at the connection point affects the extinction ratio. The minimum total extinction ratio caused by the misalignment angle is given by ERm min= 10
41、 log (tan2 )(B.2)where is the misalignment angle between two axes of birefringence 2. The total extinction ratio caused by angular misalignment ERmalso cannot determine a fixed value because ERmvaries from ER1to ERm minalong the length of the fibre. The total extinction ratio of two connected patch
42、cords is given by equation (B.3). ERmin= 10 log (10ERt min/10+ 10ERm min/10)(B.3)Figure B.1 shows the calculated extinction ratio of these samples using equation (B.3) versus measured extinction ratio for each pair of patch cords. Figure B.1 indicates that the calculated extinction ratio using equat
43、ion (B.3) corresponds to the minimum values for random concatenation of PMF connectors. The total extinction ratio can also be expressed by equation (B.4). ER = 10 log (10ERfiber/10+ 10ERconn/10) (B.4) Figure B.2 shows the theoretically calculated polarization extinction ratio for a connection of tw
44、o PM fiber sections 3. Each curve represents the initial extinction ratio (ERfiber) level of Perfect ( dB), 40 dB, 30 dB and 20 dB, as a function of misalignment angle. 9 EN 61300-3-24:2007 40 Measuredextinctionratio dBCalculated extinction ratio dB 35 30 25 20 15 10 15 20 25IEC 1983/06 30 Figure B.
45、1 Calculated extinction ratio versus measured values 50 45 40 35 30 25 20 15 10 0,0 1,0 2,0 3,0 4,0 5,0 Misalignment angle degree ExtinctionratiodB Perfect40 dB30 dB20 dBIEC 1984/06 Figure B.2 Calculated extinction ratio for a connection of two PM fiber sections EN 61300-3-24:2007 10 Bibliography 1
46、NAGASE, R. and MITACHI, S. MU-type PANDA fibre connector. In Proc. SOFM (Symposium of Optical Fibre Measurement) 96, pp. 53-56, 1996. 2 YOKOHAMA, I., NODA, J. and OKAMOTO, K., IEEE J. Lightwave Tech., Vol. LT-5, No. 7, pp. 910-915, 1987. 3 LU, Yu et al. High Stability Polarization-Maintaining Connec
47、tor. NFOEC, Orlando, FL, September 8, 2003, pp. 79-83. _ blankBS EN BSI389 Chiswick High RoadLondonW4 4AL61300-3-24:2007BSI 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 interna
48、tional level. It is incorporated by Royal Charter.RevisionsBritish Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions.It is the constant aim of BSI to improve the quality of our products and services. We wou
49、ld be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400.BSI offers members an individual updating service called PLUS which ensures that subscribers automatically rece
