1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationCalibration of wavelength/optical frequency measurement instrumentsPart 2: Michelson interferometer single wavelength metersBS EN 62129-2:2011National forewordThis British Standa
2、rd is the UK implementation of EN 62129-2:2011. It is identical to IEC 62129-2:2011.The UK participation in its preparation was entrusted to Technical Committee GEL/86, Fibre optics.A list of organizations represented on this committee can be obtained on request to its secretary.This publication doe
3、s not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. BSI 2011ISBN 978 0 580 68591 0 ICS 33.180.30Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority
4、 of the Standards Policy and Strategy Committee on 31 July 2011.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 62129-2:2011EUROPEAN STANDARD EN 62129-2 NORME EUROPENNE EUROPISCHE NORM July 2011 CENELEC European Committee for Electrotechnical Standardization Comit
5、 Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62129-2:2011 E ICS 33.180.30 E
6、nglish version Calibration of wavelength/optical frequency measurement instruments - Part 2: Michelson interferometer single wavelength meters (IEC 62129-2:2011) Etalonnage des appareils de mesure de longueur donde/appareil de mesure de la frquence optique - Partie 2: Appareils de mesure de longueur
7、 donde unique interfromtre de Michelson (CEI 62129-2:2011) Kalibrierung von Messgerten fr die Wellenlnge/optische Frequenz - Teil 2: Michelson-Interferometer-Einzelwellenlngen-Messgerte (IEC 62129-2:2011) This European Standard was approved by CENELEC on 2011-06-30. CENELEC members are bound to comp
8、ly 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 obtained on application to the Central Sec
9、retariat 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 Central Secretariat has the same status as
10、 the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway
11、, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 62129-2:2011EN 62129-2:2011 - 2 - Foreword The text of document 86/395/FDIS, future edition 1 of IEC 62129-2, prepared by IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote
12、and was approved by CENELEC as EN 62129-2 on 2011-06-30. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights. The following dates were fixed:
13、latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2012-03-30 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2014-06-30 Annex ZA has been added by CENELEC. _ Endo
14、rsement notice The text of the International Standard IEC 62129-2:2011 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60793-1-1 NOTE Harmonized as EN 60793-1-1.
15、IEC 60825-1 NOTE Harmonized as EN 60825-1. IEC 60825-2 NOTE Harmonized as EN 60825-2. _ BS EN 62129-2:2011- 3 - EN 62129-2:2011 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following referenced documents are indispensable
16、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. NOTE When an international publication has been modified by common modifications, indicated by (mod),
17、the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60050-300 2001 International Electrotechnical Vocabulary - Electrical and electronic measurements and measuring instruments - Part 311: General terms relating to measurements - Part 312: General terms relating to electrical measuremen
18、ts - Part 313: Types of electrical measuring instruments - Part 314: Specific terms according to the type of instrument - - IEC 61315 2005 Calibration of fibre-optic power meters EN 61315 2006 IEC/TR 61931 1998 Fibre optic - Terminology - - ISO/IEC 17025 2005 General requirements for the competence
19、of testing and calibration laboratories EN ISO/IEC 17025 2005 ISO/IEC Guide 99 2007 International vocabulary of metrology - Basic and general concepts and associated terms (VIM) - - ISO/IEC Guide 98-3 2008 Uncertainty of measurement - Part 3: Guide to the expression of uncertainty in measurement (GU
20、M:1995) - - BS EN 62129-2:2011 2 62129-2 IEC:2011 CONTENTS INTRODUCTION . 6 1 Scope . 7 2 Normative references 7 3 Terms and definitions . 7 4 Preparation for calibration . 11 4.1 Organization 11 4.2 Traceability 11 4.3 Advice for measurements and calibrations . 11 4.4 Recommendations to customers 1
21、2 5 Single wavelength calibration 12 5.1 General . 12 5.2 Establishing calibration conditions 12 5.3 Calibration procedure 13 5.3.1 General . 13 5.3.2 Measurement configuration 13 5.3.3 Detailed procedure. 15 5.3.4 Stability test (if necessary) . 15 5.3.5 “On/Off repeatability“ measurement (optional
22、 if a specification is available) . 16 5.3.6 Wavelength dependence measurement (optional) 18 5.3.7 Connector repeatability measurement (optional) . 19 5.4 Calibration uncertainty . 20 5.5 Reporting the results . 21 6 Absolute power calibration 21 Annex A (normative) Mathematical basis 22 Annex B (in
23、formative) Rejection of outliers . 25 Annex C (informative) Example of a single wavelength calibration 27 Annex D (informative) ITU wavelength bands . 30 Annex E (informative) Atomic and molecular reference transitions 31 Annex F (informative) Reference locked laser example . 42 Annex G (informative
24、) Balance between accuracy and calibration time 44 Bibliography 46 Figure 1 Example of a traceability chain 10 Figure 2 Wavelength meter measurement using a lock quality monitor signal 14 Figure 3 Wavelength meter measurement using a reference wavelength meter . 14 Figure F.1 Typical measurement arr
25、angement to lock laser to gas absorption line . 43 Table 1 Typical parameters to calculate the “On/Off repeatability“ measurement duration 17 Table B.1 Critical values Zcas a function of sample size N . 26 Table C.1 Type A uncertainty contributions for a stability measurement 27 Table C.2 Uncertaint
26、y contributions for a “On/Off repeatability“ measurement . 28 BS EN 62129-2:201162129-2 IEC:2011 3 Table C.3 Uncertainty budget for wavelength dependence 28 Table C.4 Uncertainty budget for the wavelength meter calibration 29 Table D.1 The ITU-T bands in different units 30 Table E.1 Helium-neon lase
27、r lines 32 Table E.2 Centre vacuum wavelengths for Acetylene 12C2H233 Table E.3 Frequency and vacuum wavelength values for the v1+ v3 and v1+ v2+ v4+ v5bands of 13C2H235 Table E.4 List of H13CN transitions . 38 Table E.5 List of 12C16O transitions 40 Table E.6 Excited state optogalvanic transitions
28、. 41 Table G.1 Summary of choices . 45 BS EN 62129-2:2011 6 62129-2 IEC:2011 INTRODUCTION Wavelength meters, often based on the Michelson interferometer, are designed to measure the wavelength of an optical source as accurately as possible. Although the wavelength meters contain an internal absolute
29、 reference, typically a Helium-Neon laser, calibration is required to achieve the highest accuracies. The instrument is typically used to measure wavelengths other than that of the internal reference. Corrections are made within the instrument for the refractive index of the surrounding air. A preci
30、se description of the calibration conditions must therefore be an integral part of the calibration. This international standard defines all of the steps involved in the calibration process: establishing the calibration conditions, carrying out the calibration, calculating the uncertainty, and report
31、ing the uncertainty, the calibration conditions and the traceability. The calibration procedure describes how to determine the ratio between the value of the input reference wavelength (or the optical frequency) and the wavelength meters result. This ratio is called correction factor. The measuremen
32、t uncertainty of the correction factor is combined following Annex A from uncertainty contributions from the reference meter, the test meter, the setup and the procedure. The calculations go through detailed characterization of individual uncertainties. It is important to know that: a) estimations o
33、f the individual uncertainties are acceptable; b) a detailed uncertainty analysis is only necessary once for each wavelength meter type under test, and that all subsequent calibrations can be based on this one-time analysis; c) some of the individual uncertainties can simply be considered to be part
34、 of a checklist, with an actual value which can be neglected. A number of optical frequency references can be used to provide a traceable optical frequency. These are based on absorption by gas molecules under low pressure and using excited-state opto-galvanic transitions in atoms. Annex E lists the
35、 lines. BS EN 62129-2:201162129-2 IEC:2011 7 CALIBRATION OF WAVELENGTH/OPTICAL FREQUENCY MEASUREMENT INSTRUMENTS Part 2: Michelson interferometer single wavelength meters 1 Scope This part of IEC 62129 is applicable to instruments measuring the vacuum wavelength or optical frequency emitted from sou
36、rces that are typical for the fibre-optic communications industry. These sources include Distributed Feedback (DFB) laser diodes, External Cavity lasers and single longitudinal mode fibre-type sources. It is assumed that the optical radiation will be coupled to the wavelength meter by a single-mode
37、optical fibre. The standard describes the calibration of wavelength meters to be performed by calibration laboratories or by wavelength meter manufacturers. This standard is part of the IEC 62129 series on the calibration of wavelength/optical frequency measurement instruments. Refer to IEC 62129 fo
38、r the calibration of optical spectrum analyzers. 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 an
39、y amendments) applies. IEC 60050-300:2001, International Electrotechnical Vocabulary Electrical and electronic measurements and measuring instruments Part 311: General terms relating to measurements Part 312: General terms relating to electrical instruments Part 313: Types of electrical measuring in
40、struments Part 314: Specific terms according to the type of instrument IEC 61315 :2005, Calibration of fibre-optic power meters IEC/TR 61931:1998, Fibre optic Terminology ISO/IEC 17025:2005, General requirements for the competence of testing and calibration laboratories ISO/IEC Guide 99:2007, Intern
41、ational vocabulary of metrology Basic and general concepts and associated terms (VIM) ISO/IEC Guide 98-3:2008, Uncertainty of measurement Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) 3 Terms and definitions For the purposes of this document, the following terms and defini
42、tions apply. 3.1 accredited calibration laboratory calibration laboratory authorized by the appropriate national organization to issue calibration certificates with a minimum specified uncertainty, which demonstrate traceability to national standards BS EN 62129-2:2011 8 62129-2 IEC:2011 3.2 adjustm
43、ent set of operations carried out on an instrument in order that it provides given indications corresponding to given values of the measurand IEC 60050-300:2001 (311-03-16); see also ISO/IEC Guide 99:2007, 3.11, modified 3.3 calibration set of operations that establish, under specified conditions, t
44、he relationship between the values of quantities indicated by a measuring instrument and the corresponding values realized by standards ISO/IEC Guide 99:2007, 2.39, modified NOTE 1 The result of a calibration permits either the assignment of values of measurands to the indications or the determinati
45、on of corrections with respect to indications. NOTE 2 A calibration may also determine other metrological properties such as the effect of influence quantities. NOTE 3 The result of a calibration may be recorded in a document, sometimes called a calibration certificate or a calibration report. 3.4 c
46、alibration conditions conditions of measurements in which the calibration is performed 3.5 correction factor CF numerical factor by which the uncorrected result of a measurement is multiplied to compensate for systematic error ISO/IEC Guide 99:2007, 2.53, modified 3.6 detector the element of the wav
47、elength meter that transduces the radiant optical power into a measurable, usually electrical quantity IEC/TR 61931 and ISO/IEC Guide 99:2007, 3.9, modified 3.7 deviation value minus its reference value NOTE In this standard, the deviation is the difference between the indication of the test meter a
48、nd the indication of the reference meter when excited under the same conditions. 3.8 excitation (fibre-) description of the distribution of optical power between the modes in the fibre NOTE Single mode fibres are generally assumed to be excited by only one mode (the fundamental mode). 3.9 instrument
49、 state complete description of the state of the meter during the calibration BS EN 62129-2:201162129-2 IEC:2011 9 3.10 measuring range set of values of measurands for which the error of a measuring instrument is intended to lie within specified limits ISO/IEC Guide 99:2007, 4.7, modified NOTE In this standard, the measuring range is the range of radiant power (part of the operating range), for which the uncertainty at operating cond
