1、BRITISH STANDARD BS EN 61300-3-31: 2003 Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-31: Examinations and measurements Coupled power ratio measurement for fibre optic sources The European Standard EN 61300-3-31:2003 has the status of a Briti
2、sh Standard ICS 33.180.20 BS EN 61300-3-31:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 9 May 2003 BSI 9 May 2003 ISBN 0 580 41748 4 National foreword This British Standard is the official English language version of EN 61300-3-31:200
3、3. It is identical with IEC 61300-3-31:2003. The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/3, 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 the UK interests informed; monitor related international and European developments and promulgate them
7、 in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 7 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPE
8、AN STANDARD EN 61300-3-31 NORME EUROPENNE EUROPISCHE NORM April 2003 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 2003 CENELE
9、C - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61300-3-31:2003 E ICS 33.180.20 English version Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-31: Examinations and measurements Co
10、upled power ratio measurement for fibre optic sources (IEC 61300-3-31:2003) Dispositifs dinterconnexion et composants passifs fibres optiques - Mthodes fondamentales dessais et de mesures Partie 3-31: Examens et mesures - Mesure du rapport de puissance couple pour les sources fibres optiques (CEI 61
11、300-3-31:2003) Lichtwellenleiter-Verbindungselemente und passive Bauteile Grundlegende Prf- und Messverfahren Teil 3-31: Untersuchungen und Messungen Messung des gekoppelten Leistungsverhltnisses bei Lichtwellenleiterquellen (IEC 61300-3-31:2003) This European Standard was approved by CENELEC on 200
12、3-03-01. 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-date lists and bibliographical references concerning such national standards may be
13、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 under the responsibility of a CENELEC member into its own language and notified to the
14、Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia,
15、 Spain, Sweden, Switzerland and United Kingdom. Foreword The text of document 86B/1779/FDIS, future edition 1 of IEC 61300-3-31, 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
16、 by CENELEC as EN 61300-3-31 on 2003-03-01. 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) 2003-12-01 latest date by which the national standards conflicting with the EN have
17、 to be withdrawn (dow) 2006-03-01 Annexes designated “normative“ are part of the body of the standard. In this standard, annex ZA is normative. Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61300-3-31:2003 was approved by CENELEC as a European St
18、andard without any modification. In the official version, for Bibliography, the following note has to be added for the standard indicated: IEC 61300-1 NOTE Harmonized as EN 61300-1:1997 (not modified). _ Page2 EN61300331:200361300-3-31 IEC:2003 3 FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPO
19、NENTS BASIC TEST AND MEASUREMENT PROCEDURES Part 3-31: Examinations and measurements Coupled power ratio measurement for fibre optic sources 1 Scope This part of IEC 61300 describes the method to measure the coupled power ratio (CPR) coefficient. CPR measurements are used to characterise optical sou
20、rces and to standardize the launch conditions for measurements of attenuation on multimode fibres and insertion loss according to IEC 61300-3-4. The CPR coefficient may be measured at both 850 nm and 1 300 nm wavelengths. 2 Normative references The following referenced documents are indispensable fo
21、r 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 60793-1 (all parts), Optical fibres Part 1: Generic specification IEC 61300-3-4, Fibre optic interco
22、nnecting devices and passive components Basic test and measurement procedures Part 3-4: Examination and measurements Attenuation 3 General description The modal distribution launched into multimode fibre can vary widely with different light sources. This variation in launched modal distribution can
23、result in significant differences in measured attenuation in the same object. CPR coefficient test method gives information about the launched modal distribution (LMD) condition in a measured object. The CPR coefficient test method is based on comparison of the difference in coupled power between mu
24、ltimode and single mode fibres. The CPR measurement is easily made and gives quantitative, repeatable results. Page3 EN61300331:200361300-3-31 IEC:2003 4 4 Apparatus 4.1 Source (S) The preferred source parameters for multimode sources are given in IEC 61300-3-4: S3 for measurement on central wavelen
25、gth 1 300 nm; S2 for measurement on central wavelength 850 nm. 4.2 Power meter (D) The preferred power meter parameters for multimode detectors type D1 are given in IEC 61300-3-4. 4.3 Test patchcords (TP) Two test patchcords (jumpers) are used: multimode test launch patchcord TLP and single mode tes
26、t terminal patchcord TTP. They shall be equal to or longer than 2 m long and have coatings that strip cladding light. Patchcord connectors shall be of a type and style compatible with the output/input ports of the light source (S) and power meter (D). In addition, the type and style shall facilitate
27、 patchcord matings. 4.3.1 Test launch patchcord (TLP) Test launch patchcord TLP shall contain multimode fibre of the same nominal core diameter and numerical aperture as the fibre in the fibre path to be tested (e.g. IEC 60793-1 Type A1a (50/125) or A1b (62,5/125) in either secondary coated or reinf
28、orced cable format). Where single-mode grade connectors are chosen to terminate the patchcords, it is necessary to select the appropriate ferrule inside diameter. 4.3.2 Test terminal patchcord (TTP) Test terminal patchcord TTP shall contain IEC 60793-1 Type B1.1 single-mode fibre for tests on 1 300
29、nm light sources and fibre which is single-moded at 850 nm for tests on 850 nm light sources. Suggested specifications for these fibres are: MFD = (9,0 1,0) m for 1 300 nm tests and MFD = (5,0 0,5) m for 850 nm. 4.3.3 Patchcord connectors (PC) The connectors on test patchcords TLP and TTP shall have
30、 insertion loss (IL) lower than 0,5 dB in the relevant wavelength band ( = 1 300 nm and = 850 nm), as measured by IEC 61300-3-4 insertion method (B). Connectors which inhibit Fresnel reflections (e.g. physical contact (PC) style connectors) are preferable. 4.3.4 Reference adapter (RA) The reference
31、adapter shall be defined in the relevant specification. Page4 EN61300331:200361300-3-31 IEC:2003 5 5 Procedure 5.1 Measurement 5.1.1 Preconditioning The alignment and end surfaces of the plug ferrules and the reference adapter shall be cleaned before test. The clean conditions shall be maintained du
32、ring the test. 5.1.2 Initial MM measurement Connect the multimode test launch patchcord TLP to the light source under test (S) and measure the power P1 (W) (or power level L1 dBm) at the output of the patchcord TLP, as shown in Figure 1. Deploy this patchcord in such a way as to minimize changes in
33、deployment during the test which could affect the modal power distribution. Avoid bend radii less than 50 mm. TLP S D IEC 040/03Figure 1 Initial MM measurement 5.1.3 Final SM measurement Leaving the multimode patchcord TLP connected to the light source, connect its output end to the single mode patc
34、hcord TTP. Make two loops around the mandrel wrap of 30 mm diameter on the TTP patchcord as a mode filter for single mode transmission assurance. Place the other end of the single mode patchcord TTP into the detector and measure the power P2 (W) or power level L2 (dB), as shown in Figure 2. TLP TTP
35、S D IEC 041/03Figure 2 Final SM measurement 5.2 CPR coefficient calculation The CPR coefficient is calculated as: a) for power measurement: CPR = 10 log P1/P2 (dB); b) for power level measurement: CPR = L1 L2 (dB). Page5 EN61300331:200361300-3-31 IEC:2003 6 6 Details to be specified The following de
36、tails shall be specified: Light source Manufacturer and type Output type (MM, SM) Working wavelength MM test launch patchcord TLP MM fibre type MM connector type and style SM test terminated patchcord TTP SM fibre type SM connector type and style Reference connector adapter Page6 EN61300331:2003 Ann
37、ex ZA (normative) Normative references to international publications with their corresponding European publications This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and th
38、e publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (inclu
39、ding amendments). NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60793-1 Series Optical fibres Part 1: Generic specification - - IEC 61300-3-4 2001 Fibre optic interconnecting dev
40、ices and passive components - Basic test and measurement procedures Part 3-4: Examinations and measurements - Attenuation EN 61300-3-4 2001 61300-3-31 IEC:2003 7 Bibliography IEC 61300-1, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 1: General
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