1、 IEC 61300-3-14 Edition 3.0 2014-10 INTERNATIONAL STANDARD Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-14: Examinations and measurements Error and repeatability of the attenuation settings of a variable optical attenuator IEC 61300-3-14:201
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11、 Edition 3.0 2014-10 INTERNATIONAL STANDARD Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-14: Examinations and measurements Error and repeatability of the attenuation settings of a variable optical attenuator INTERNATIONAL ELECTROTECHNICAL CO
12、MMISSION M ICS 33.180.20 PRICE CODE ISBN 978-2-8322-1885-3 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. 2 IEC 61300-3-14:2014 IEC:2014 CONTENTS FOREWORD . 3 1 Scope 5 2 Normative references
13、 5 3 General description . 5 4 Apparatus 7 4.1 Light source (S) and launch conditions . 7 4.2 Detector (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 wit
14、h absolute calibration . 8 6.2 Attenuation error for VOAs with relative calibration . 9 6.3 Maximum deviation 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
15、 condition . 10 8.3 Detector 10 8.4 Reference fibre . 10 8.5 Temporary joint . 10 8.6 DUT 10 8.7 Measurement 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 characterist
16、ics 12 B.1 General . 12 B.2 Measurement procedure . 12 B.3 Calculation 12 Figure 1 Measured versus nominal attenuation 6 Figure 2 Measurement set-up 8 Table A.1 Device performance specifications versus actual performance . 11 IEC 61300-3-14:2014 IEC:2014 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _
17、 FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND MEASUREMENT PROCEDURES Part 3-14: Examinations and measurements Error and repeatability of the attenuation settings of a variable optical attenuator FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwi
18、de organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other acti
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27、ications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
28、 patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61300-3-14 has been prepared by subcommittee 86B: Fibre optic interconnecting devices and passive components, of IEC technical committee 86: Fibre optics. This third edition ca
29、ncels and replaces the second edition published in 2006 and constitutes a technical revision This edition includes the following significant technical changes with respect to the previous edition: a) title modification replacing the word “accuracy“ by “error“; b) inclusion of the distinction of manu
30、ally and electrically controlled variable optical attenuators in the Scope; 4 IEC 61300-3-14:2014 IEC:2014 c) revision of clauses for apparatus and details to be specified to harmonize with other standards in the IEC 61300 series; d) addition of “the maximum deviation of attenuation from setting” to
31、 the clause for calculation; e) addition of “measurement method of hysteresis characteristics” in Annex B. The text of this standard is based on the following documents: FDIS Report on voting 86B/3816/FDIS 86B/3843/RVD Full information on the voting for the approval of this standard can be found in
32、the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 61300 series, published under the general title, Fibre optic interconnecting devices and passive components Basic test and measuremen
33、t procedures can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will
34、 be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. IEC 61300-3-14:2014 IEC:2014 5 FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS BASIC TEST AND MEASUREMENT PROCEDURES Part 3-14: Examinations and me
35、asurements 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 VOA
36、s, 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 indispensable
37、 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:
38、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 attenuation
39、 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 no
40、minal 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 atte
41、nuation 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. Th
42、e 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. 6 IEC 61300-3-14:2014 IEC:2014 Gene
43、rally 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 which the manufacturer pr
44、ovides 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 (A i ) dB Measured attenuation (a i ) dB (A 1 , a 1 ) (A 2 , a 2 )
45、 (A 3 , a 3 ) (A 4 , a 4 ) (A 5 , a 5 ) Ideal curve a i= A ia i 3 i3-Repeatability: a i= 3 iIEC Error: a i= a i A iFigure 1a Absolute calibration of attenuation 30 20 10 0 0 10 20 30 Nominal attenuation setting (A i ) dB Measured attenuation (a i ) dB (A 1 , a 1 ) (A 2 , a 2 ) (A 3 , a 3 ) (A 4 , a
46、4 ) (A 5 , a 5 ) Ideal curve a i 3 i3-Repeatability: a i= 3 ia i= A i+ a 1a 1= zero-point attenuation (mean value) IEC Error: a i= a i a 1 A iFigure 1b Calibration relative to zero-point setting Figure 1 Measured versus nominal attenuation IEC 61300-3-14:2014 IEC:2014 7 4 Apparatus 4.1 Light source
47、(S) and launch conditions The 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
48、 combination shall be at least 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
49、 correspond to the operating 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 be characterized. Other requirements of the light source and launch conditions shall be in accordance with IEC 61300-3-4. An excitati
