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1、BRITISH STANDARD BS EN 61300-3-6: 2003 Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-6: Examinations and measurements Return loss The European Standard EN 61300-3-6:2003 has the status of a British Standard ICS 33.180.20 ? Licensed Copy: shef
2、fieldun sheffieldun, na, Mon Nov 13 06:27:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61300-3-6:2003 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 41747 6 National foreword This British Standard
3、is the official English language version of EN 61300-3-6:2003. It is identical with IEC 61300-3-6:2003. It supersedes BS EN 61300-3-6:1997 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/2, Fibre optic inte
4、rconnecting devices and passive components, which has the responsibility to: A list of organizations represented on 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 documen
5、t may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or 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. Us
6、ers are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for chang
7、e, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 25 and a back cover. The BSI copyright date displayed in this doc
8、ument indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 06:27:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN 61300-3-6 NORME EUROPENNE EUROPISCHE NORM April 2003 CENELEC Eu
9、ropean Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide
10、for CENELEC members. Ref. No. EN 61300-3-6:2003 E ICS 33.180.20 Supersedes EN 61300-3-6:1997 + A1:1998 + A2:1999 English version Fibre optic interconnecting devices and passive components - Basic test and measurement procedures Part 3-6: Examinations and measurements - Return loss (IEC 61300-3-6:200
11、3) Dispositifs dinterconnexion et composants passifs fibres optiques - Mthodes fondamentales dessais et de mesures Partie 3-6: Examens et mesures - Puissance rflchie (CEI 61300-3-6:2003) Lichtwellenleiter-Verbindungselemente und passive Bauteile - Grundlegende Prf- und Messverfahren Teil 3-6: Unters
12、uchungen und Messungen - Rckflussdmpfung (IEC 61300-3-6:2003) This European Standard was approved by CENELEC on 2003-03-01. 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
13、 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
14、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, Czech Republic, Denmark, Finland, Fra
15、nce, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 06:27:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Foreword The text of document
16、86B/1778/FDIS, future edition 2 of IEC 61300-3-6, 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 61300-3-6 on 2003-03-01. This European Standard supersedes EN
17、 61300-3-6:1997 + A1:1998 + A2:1999. 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 to be
18、withdrawn (dow) 2006-03-01 Annexes designated “normative“ are part of the body of the standard. Annexes designated “informative“ are given for information only. In this standard, annex ZA normative and annex A is informative. Annex ZA has been added by CENELEC. _ Endorsement notice The text of the I
19、nternational Standard IEC 61300-3-6:2003 was approved by CENELEC as a European Standard without any modification. _ Page 2 EN 6130036:2003 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 06:27:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI -00316-36 (3002:CEI )E 3 CONTENTS 1 Scope.4 2 Normativ
20、e references4 3 General description.4 3.1 Method 1 .5 3.2 Method 2 .5 3.3 Method 3 .5 3.4 Method 4 .5 3.5 Selection of reference measurement method .5 4 Apparatus and symbols.6 4.1 Device under test (DUT) 6 4.2 Method 1: measurements with OCWR6 4.3 Method 2: measurements with OTDR.8 4.4 Method 3: me
21、asurements with OLCR .8 4.5 Method 4: measurements with a OFDR10 5 Procedure.11 5.1 Launch conditions11 5.2 Pre-conditioning 12 5.3 DUT output port.12 5.4 Method 1: measurement with OCWR .12 5.5 Method 2: measurement with OTDR.16 5.6 Method 3: measurement with OLCR.19 5.7 Method 4: measurements with
22、 OFDR.19 6 Details to be specified.21 6.1 Return loss measurement with OCWR .21 6.2 Return loss measurement with OTDR 21 6.3 Return loss measurement with OLCR.22 6.4 Return loss measurement with OFDR 22 6.5 Measurement procedure 23 Annex A (informative) Comparison of return loss detectable by four d
23、ifferent methods.24 Annex ZA (normative) Normative references to international publications with their corresponding European publications.25 Figure 1 Measurement set-up of return loss OCWR method6 Figure 2 Measurement set-up of return loss with OTDR method8 Figure 3 Measurement set-up of return los
24、s with OLCR method9 Figure 4 Measurement set-up of return loss with OFDR method10 Figure 5 Measurement set-up of the system reflected power.13 Figure 6 Measurement set-up of the branching device transfer coefficient.13 Figure 7 Measurement set-up of the splitting ratio of the branching device14 Figu
25、re 8 Measurement set-up of return loss with an OCWR 14 Figure 9 Typical OTDR trace of the response to a reflection16 Figure A.1 Comparison of detectable return loss, resolution and measurable distance for four return loss measurement methods 24 Page 3 EN 6130036:2003 Licensed Copy: sheffieldun sheff
26、ieldun, na, Mon Nov 13 06:27:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 -00316-36 (3002:CEI )E FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND MEASUREMENT PROCEDURES Part 3-6: Examinations and measurements Return loss 1 Scope This part of IEC 61300 presents procedures
27、for the measurement of the return loss (RL) of a fibre optic device under test (DUT). RL, as used in this standard, is the ratio of the power (Pi) incident on, or entering, the DUT to the total power reflected (Pr) by the DUT, expressed in decibels: = i r log10 P P RL (1) Return loss is a positive n
28、umber. 2 Normative references The following referenced documents are indispensable for 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 60793-2 (all pa
29、rts), Optical fibres Product specifications IEC 61300-1, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 1: General and guidance IEC 61300-3-1, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part
30、3-1: Examinations and measurements Visual examination IEC 61300-3-39, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-39: Examinations and measurements PC optical connector reference plug selection 3 General description Four methods will be pre
31、sented for measuring optical return loss: measurement with an optical continuous wave reflectometer (OCWR) (method 1); measurement with an optical time domain reflectometer (OTDR) (method 2); measurement with an optical low coherence reflectometry (OLCR) (method 3); measurement with an optical frequ
32、ency domain reflectometry (OFDR) (method 4). These four measurement methods have different characteristics and different applications in terms of spatial resolution and detectable RL (in annex A a comparison of return loss detectable by the four different methods is reported). Page 4 EN 6130036:2003
33、 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 13 06:27:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI -00316-36 (3002:CEI )E 5 3.1 Method 1 This technique is the nearest to the theoretical definition of return loss given by equation (1). It measures directly the incident power and the reflecte
34、d power. It is not affected by instrumental data processing and it gives absolute measurement values, which are not relative to a reference reflection (technique A). This method has some limiting factors: it cannot spatially resolve two different reflections on the line and its dynamic range is limi
35、ted by the characteristics of the branching device and by the ability to suppress the reflections beyond the one from the DUT. 3.2 Method 2 This method allows measurement of RL from reflection points on an optical line, with a spatial resolution in the metre range and with a dynamic range of more th
36、an 75 dB (depending on the pulse width) using an OTDR instrument. The OTDR measurement method is very suitable for field measurements where it is necessary to measure RLs on long optical lines. 3.3 Method 3 The purpose of this method is to measure reflection profiles of single-mode optical devices w
37、ith a micrometre spatial resolution and a high dynamic range (90 dB) by using optical low- coherence interference. The reflection profile is defined as a distribution of reflections at individual end-faces and/or connected points in single-mode optical devices. When the reflection at a particular po
38、int is R (dB), the return loss at this point is given by R (dB). This method measures the reflection at a point by detecting the power of a beat signal produced by optical interference between the reflected light and the reference light. When a component with dispersed reflections is analysed, each
39、reflection can be identified and located, provided their separation is greater than the spatial resolution of the measurement system. 3.4 Method 4 The purpose of this procedure is to measure the return loss of single-mode optical devices with a spatial resolution in the centimetre range and high dyn
40、amic range (70 dB) by using optical frequency domain reflectometry One of the prime benefits of this technique is the ability to spatially resolve the desired reflection from undesired ones, such as all of the connectors or unterminated ports on the DUT, without any dead zone. Moreover, the OFDR met
41、hod is highly reliable and the apparatus can be compact. Measurement in the frequency domain is based on the ability to convert information in the time domain by means of an inverse Fourier transform. In this way with a source modulated from some kHz to 1 GHz, it is possible to resolve two reflectiv
42、e points on an optical line separated by some centimetres. 3.5 Selection of reference measurement method Due to the different characteristics of these methods, and their different application fields, the reference method depends on the type of DUT. For a component with RL 55 dB the reference is meth
43、od 1, for a component with RL 55 dB the reference is method 2 using a pulse duration less than 100 ns. In cases in which it is necessary to resolve more reflection points separated by a distance of less than 5 m, the reference shall be method 3. Page 5 EN 6130036:2003 Licensed Copy: sheffieldun shef
44、fieldun, na, Mon Nov 13 06:27:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 6 -00316-36 (3002:CEI )E 4 Apparatus and symbols 4.1 Device under test (DUT) Where the DUT is the mounted connector on one end of a component, the reference mating plug shall be considered one-half of the DUT connection on t
45、he temporary joint (TJ) side and have the same end-face finish and minimum performance as the connectors to be measured. Where the DUT is an entire component assembly terminated with pigtails with or without connectors, reference plugs with pigtails and, as required, reference adapters are to be add
46、ed to those ports with connector terminations so as to form complete connector assemblies with pigtails. Reference mating plugs shall then be considered one-half of the TJ and have the same end-face finish and minimum performance as the connectors to be measured. All unused ports shall be terminated
47、 as stated in 4.2.5. Unless otherwise specified, reference plugs shall meet IEC 61300-3-39. The reference adapters shall meet the appropriate IEC connector interface dimensions and ensure a high degree of repeatability and reproducibility. It is recommended that the test adapters be tested and visua
48、lly inspected after every 100 matings and replaced after 500 matings. 4.2 Method 1: measurements with OCWR T1 PaPref. D1 S1 BD DUT TJ1 D2 IEC 030/03 Figure 1 Measurement set-up of return loss OCWR method The circuit in Figure 1 is representative of, but is not the only, circuit that may be used for
49、OCWR return loss measurement. The requirements are that the values measured satisfy the following two conditions: Pa (power measured by the detector D1) shall be proportional to the power reflected from the DUT, Pr, plus the reflected power originating in the measurement circuit outside of the DUT, P0: 0 PPCP+= r1a (mW) (2) Pref (power measu