1、BSI Standards PublicationFibre optic interconnecting devices and passive components Basic test and measurement proceduresPart 3-14: Examinations and measurements Error and repeatability of the attenuation settings of a variable optical attenuatorBS EN 61300-3-14:2014National forewordThis British Sta
2、ndard is the UK implementation of EN 61300-3-14:2014. It isidentical to IEC 61300-3-14:2014. It supersedes BS EN 61300-3-14:2007which is withdrawn.The UK participation in its preparation was entrusted by TechnicalCommittee GEL/86, Fibre optics, to Subcommittee GEL/86/2, Fibre opticinterconnecting de
3、vices and passive components.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2
4、014.Published by BSI Standards Limited 2014ISBN 978 0 580 84233 7ICS 33.180.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 December 2014.Amendments/corrigend
5、a issued since publicationDate Text affectedBRITISH STANDARDBS EN 61300-3-14:2014EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 61300-3-14 November 2014 ICS 33.180.20 Supersedes EN 61300-3-14:2007 English Version Fibre optic interconnecting devices and passive components - Basic test and measurem
6、ent procedures - Part 3-14: Examinations and measurements - Error andrepeatability of the attenuation settings of a variable opticalattenuator (IEC 61300-3-14:2014) Dispositifs dinterconnexion et composants passifs fibresoptiques - Procdures fondamentales dessais et demesures - Partie 3-14: Examens
7、et mesures - Erreur et rptabilit des positions daffaiblissement dun affaiblisseur optique variable (CEI 61300-3-14:2014) Lichtwellenleiter - Verbindungselemente und passiveBauteile - Grundlegende Prf- und Messverfahren - Teil 3-14: Untersuchungen und Messungen - Abweichungund Reproduzierbarkeit der
8、Einstellung eines einstellbaren optischen Dmpfungsgliedes (IEC 61300-3-14:2014) This European Standard was approved by CENELEC on 2014-11-14. 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
9、 national standard without any alteration.Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German
10、). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.CENELEC members are the national electrotechnical committees of Austria, Belgium, B
11、ulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Swit
12、zerland,Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation ElectrotechniqueEuropisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CENELEC All rights of exploitation in a
13、ny form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 61300-3-14:2014 E Foreword The text of document 86B/3816/FDIS, future edition 3 of IEC 61300-3-14, prepared by SC 86B “Fibre optic interconnecting devices and passive components” of IEC/TC 86 “Fibre optics“ was submitted to
14、 the IEC-CENELEC parallel vote and approved by CENELEC as EN 61300-3-14:2014. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2015-08-14 latest date by which the national
15、 standards conflicting with the document have to be withdrawn (dow) 2015-11-14 This document supersedes EN 61300-3-14:2007. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for ident
16、ifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 61300-3-14:2014 was approved by CENELEC as a European Standard without any modification. BS EN 61300-3-14:2014 EN 61300-3-14:2014Annex ZA (normative) Normative references to international publications
17、 with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced docu
18、ment (including any amendments) applies. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cene
19、lec.eu Publication Year Title EN/HD Year IEC 61300-1 - Fibre optic interconnecting devices and passive components - Basic test and measurement procedures - Part 1: General and guidance EN 61300-1 - IEC 61300-3-4 - Fibre optic interconnecting devices and passive components - Basic test and measuremen
20、t procedures - Part 3-4: Examinations and measurements - Attenuation EN 61300-3-4 - BS EN 61300-3-14:2014 EN 61300-3-14:2014 2 IEC 61300-3-14:2014 IEC:2014 CONTENTS 1 Scope 5 2 Normative references 5 3 General description . 5 4 Apparatus 7 4.1 Light source (S) and launch conditions . 7 4.2 Detector
21、(D) 7 4.3 Reference fibre (RF) . 7 4.4 Temporary joint (TJ) . 7 5 Measurement procedure 8 5.1 Measurement set-up . 8 5.2 Measurement procedure . 8 6 Calculation 8 6.1 Attenuation error for VOAs with absolute calibration . 8 6.2 Attenuation error for VOAs with relative calibration . 9 6.3 Maximum dev
22、iation of attenuation from setting for all attenuation levels 9 6.4 Repeatability of attenuation 9 7 Measurement report 9 8 Details to be specified . 10 8.1 General . 10 8.2 Light source and launch condition . 10 8.3 Detector 10 8.4 Reference fibre . 10 8.5 Temporary joint . 10 8.6 DUT 10 8.7 Measur
23、ement procedure . 10 8.8 Measurement uncertainty 10 8.9 Others. 10 Annex A (informative) Example of a sample measurment record 11 Annex B (informative) Measurement method of hysteresis characteristics 12 B.1 General . 12 B.2 Measurement procedure . 12 B.3 Calculation 12 Figure 1 Measured versus nomi
24、nal attenuation 6 Figure 2 Measurement set-up 8 Table A.1 Device performance specifications versus actual performance . 11 BS EN 61300-3-14:2014IEC 61300-3-14:2014 IEC:2014 5 FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND MEASUREMENT PROCEDURES Part 3-14: Examinations and
25、measurements Error and repeatability of the attenuation settings of a variable optical attenuator 1 Scope This part of IEC 61300 provides a method to measure the error and repeatability of the attenuation value settings of a variable optical attenuator (VOA). There are two control technologies for V
26、OAs, manually controlled and electrically controlled. This standard covers both control technologies of VOAs and also covers both single-mode and multimode fibre VOAs. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensab
27、le for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61300-1, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 1
28、: General and guidance IEC 61300-3-4, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-4:Examinations and measurements Attenuation 3 General description A variable optical attenuator is adjusted sequentially through a series of nominal attenuati
29、on settings prescribed in the relevant specification. For an electrically controlled VOA, the attenuation is set by applying electrical voltage or current to the device. There are two categories of VOAs: those that can be adjusted to nominal attenuation levels; those that have no information on the
30、nominal attenuation levels. Some manually controlled VOAs have a scaled dial to indicate the nominal attenuation levels. Some electrically controlled VOAs have a table (or equation) indicating the applied voltage (or current) corresponding to nominal attenuation levels. This measurement method of at
31、tenuation error and repeatability can only be applied to VOAs which can be adjusted to nominal attenuation levels. In this type of measurement, the attenuation value is measured at each setting. This sequence of measurements is repeated a number of times as prescribed in the relevant specification.
32、The error of the attenuator at each setting is then given by the difference between the mean of the measured values and the nominal value. The repeatability at each setting is given by a value of plus and minus three times the standard deviation of the measurements. BS EN 61300-3-14:2014 6 IEC 61300
33、-3-14:2014 IEC:2014 Generally the nominal attenuation levels are provided in different two ways, i.e. absolute or relative attenuation calibration levels. Figure 1a characterizes an attenuator which is calibrated to read the actual or measured attenuation. Figure 1b characterizes an attenuator for w
34、hich the manufacturer provides the calibration results relative to a zero-point setting. When the attenuator is adjusted to read zero, the actual or measured attenuation will be some value greater than zero. 30 20 10 0 0 10 20 30 Nominal attenuation setting (Ai) dB Measured attenuation(ai) dB(A1, a1
35、) (A2, a2) (A3, a3) (A4, a4) (A5, a5) Ideal curve ai= Aiai 3i3-Repeatability: ai= 3iIEC Error: ai= ai AiFigure 1a Absolute calibration of attenuation 30 20 10 0 0 10 20 30 Nominal attenuation setting (Ai) dB Measured attenuation(ai) dB(A1, a1) (A2, a2) (A3, a3) (A4, a4) (A5, a5) Ideal curve ai 3i3-R
36、epeatability: ai= 3iai= Ai+ a1a1= zero-point attenuation (mean value) IEC Error: ai= ai a1 AiFigure 1b Calibration relative to zero-point setting Figure 1 Measured versus nominal attenuation BS EN 61300-3-14:2014IEC 61300-3-14:2014 IEC:2014 7 4 Apparatus 4.1 Light source (S) and launch conditions Th
37、e output power of the light source shall be sufficiently high to permit a sufficiently large measurement dynamic range with the optical detector used. The output power stability shall be less than or equal to 0,05 dB over one hour. The dynamic range of the source/detector combination shall be at lea
38、st 10 dB greater than the absolute value of the maximum attenuation value to be measured. However the output power into the fibre shall not exceed the maximum operating input power rating of the VOA to be tested. The wavelength and spectral width of the light source shall correspond to the operating
39、 wavelength range and calibration settings of the VOA to be measured. For the measurement of single-mode VOAs, polarization dependent loss (PDL) may influence the error and repeatability of attenuation values. Unless otherwise specified, random polarization states shall be used or the PDL shall also
40、 be characterized. Other requirements of the light source and launch conditions shall be in accordance with IEC 61300-3-4. An excitation unit shall be used to satisfy the launch condition defined in IEC 61300-1, if necessary. Moreover cladding modes shall be stripped as typically achieved by the fib
41、re coating, so that they do not affect the measurement. 4.2 Detector (D) A high dynamic range optical power meter should be used for the detector. Its wavelength range shall be wider than the operating wavelength range of the VOA to be measured. In order to make measurements with low uncertainty, th
42、e linearity of the optical power meter is most important for the error and repeatability of VOA measurements. The minimum resolution of the detector shall be 0,01 dB. Other requirements of detector shall be in accordance with IEC 61300-3-4. 4.3 Reference fibre (RF) In order to measure the output pow
43、er of the light source, a reference fibre is used. The reference fibre shall be of the same performance as the pigtail fibre of the VOA to be measured. 4.4 Temporary joint (TJ) This is a method, device or mechanical fixture for temporarily aligning two fibre ends into a stable, reproducible, low-los
44、s joint. It is used when direct connection of the device under test (DUT) to the measurement system is not achievable by a standard connector. It may, for example, be a precision V-groove, vacuum chuck, a micromanipulator, or a fusion or mechanical splice. The temporary joint shall be stable to with
45、in 10 % of the measurement uncertainty required in dB over the time taken to measure P0and Pn. A suitable refractive index matching material may be used to improve the stability of the TJ. Patchcords with direct connection to the light source may be used and the use of TJs is not mandatory. BS EN 61
46、300-3-14:2014 8 IEC 61300-3-14:2014 IEC:2014 5 Measurement procedure 5.1 Measurement set-up Figure 2 shows the measurement set-up. The position of the fibres during the measurement shall remain fixed between the measurement of P0and Pnto avoid changes in attenuation due to bending losses. S TJ D P0R
47、F IEC Figure 2a Measurement of reference power S TJ D PnDUT IEC Figure 2b Measurement of attenuation Figure 2 Measurement set-up 5.2 Measurement procedure The measurement procedure is as follows: a) Assemble the measurement set-up as shown in Figure 2a and measure P0. b) Insert the VOA to be measure
48、d (DUT) into the measurement set-up as shown in Figure 2b. c) Adjust the DUT to the lowest attenuation level and record the power level of P1. d) Increase the attenuation of the DUT to the next lowest attenuation level and record the power level of P2. e) Continue to measure and record the power lev
49、els of P3, P4, .Pn, increasing the attenuation levels to the next higher attenuation level for each step. f) Repeat steps c) to e) and record a second set of readings P1(2) to Pn(2). g) Repeat step f) for the number of times m specified in the relevant specification. 6 Calculation 6.1 Attenuation error for VOAs with absolute calibration Calculate the error of the ithattenuation setting using the following equation: iiiAaa = (dB) (1) where 0i10 /)(log)( PnPn
