1、 TIA-455-204-A (Revision of TIA-455-204) October 2013FOTP-204 Measurement of Bandwidth on Multimode Fiber ANSI/TIA-455-204-A-2013 APPROVED: OCTOBER 1, 2013 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufa
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19、SE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. 60793-1-41 IEC:2010 adoopted as ANSI/TIA-455-204A i CONTENTS FOREWORD iii 1 Scope . 1 2 Normative references . 1 3 Terms and definitions . 2 4 Apparatus . 2 4.1 Radiation source . 2 4.1.1 Method A Time domain (pulse distortion) meas
20、urement 2 4.1.2 Method B Frequency domain measurement 3 4.1.3 Method C Overfilled launch modal bandwidth calculated from differential mode delay (OMBc) . 3 4.1.4 For methods A and B . 3 4.2 Launch system 3 4.2.1 Overfilled launch (OFL) . 3 4.2.2 Restricted mode launch (RML) 4 4.2.3 Differential mode
21、 delay (DMD) launch . 5 4.3 Detection system . 5 4.4 Recording system 5 4.5 Computational equipment 6 4.6 Overall system performance 6 5 Sampling and specimens 6 5.1 Test sample 6 5.2 Reference sample . 6 5.3 End face preparation . 6 5.4 Test sample packaging 7 5.5 Test sample positioning . 7 6 Proc
22、edure 7 6.1 Method A Time domain (pulse distortion) measurement 7 6.1.1 Output pulse measurement 7 6.1.2 Input pulse measurement method A-1: reference sample from test sample 7 6.1.3 Input pulse measurement method A-2: periodic reference sample . 7 6.2 Method B Frequency domain measurement 8 6.2.1 O
23、utput frequency response 8 6.2.2 Method B-1: Reference length from test specimen . 8 6.2.3 Method B-2: Reference length from similar fibre 8 6.3 Method C Overfilled launch modal bandwidth calculated from differential mode delay (OMBc) . 8 7 Calculations or interpretation of results 9 7.1 -3 dB frequ
24、ency, f3 dB . 9 7.2 Calculations for optional reporting methods . 10 8 Length normalization 10 9 Results . 10 9.1 Information to be provided with each measurement . 10 9.2 Information available upon request 10 10 Specification information 11 60793-1-41 IEC:2010 adoopted as ANSI/TIA-455-204A ii Annex
25、 A (normative) Intramodal dispersion factor and the normalized intermodal dispersion limit 12 Annex B (normative) Fibre transfer function, H(f), power spectrum, |H(f)|, and f3 dB 15 Annex C (normative) Calculations for other reporting methods . 17 Annex D (normative) Mode scrambler requirements for
26、overfilled launching conditions to multimode fibres . 19 Bibliography 24 Figure 1 Mandrel wrapped mode filter 5 Figure D.1 Two examples of optical fibre scramblers . 20 Table 1 DMD weights for calculating overfilled modal bandwidth (OMBc) from DMD data for 850 nm only . 9 Table A.1 Highest expected
27、dispersion for commercially available A1 fibres 12 60793-1-41 IEC:2010 adoopted as ANSI/TIA-455-204A iii INTERNATIONAL ELECTROTECHNICAL COMMISSION _ OPTICAL FIBRES Part 1-41: Measurement methods and test procedures Bandwidth FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldw
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38、 patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60793-1-41 has been prepared by subcommittee 86A: Fibres and cables, of IEC technical committee 86: Fibre optics. This third edition cancels and replaces the second edition pub
39、lished in 2003. This edition constitutes a technical revision. The main change with respect to the previous edition is the addition of a third method for determining modal bandwidth based on DMD data and to improve measurement procedures for A4 fibres. This standard should be read in conjunction wit
40、h IEC 60793-1-1 and IEC 60793-1-2, which cover generic specifications. 60793-1-41 IEC:2010 adoopted as ANSI/TIA-455-204A iv The text of this standard is based on the following documents: FDIS Report on voting 86A/1294/CDV 86A/1329/RVD Full information on the voting for the approval of this standard
41、can be found in 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 of the IEC 60793-1-4x series, published under the general title Optical fibres measurement methods and test procedures, can be f
42、ound 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 be reconfirmed, withd
43、rawn, replaced by a revised edition, or amended. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printe
44、r. 60793-1-41 IEC:2010 adoopted as ANSI/TIA-455-204A 1 OPTICAL FIBRES Part 1-41: Measurement methods and test procedures Bandwidth 1 Scope This part of IEC 60793 describes three methods for determining and measuring the modal bandwidth of multimode optical fibres (see IEC 60793-2-10, IEC 60793-30 se
45、ries and IEC 60793-40 series). The baseband frequency response is directly measured in the frequency domain by determining the fibre response to a sinusoidaly modulated light source. The baseband response can also be measured by observing the broadening of a narrow pulse of light. The calculated res
46、ponse is determined using differential mode delay (DMD) data. The three methods are: Method A Time domain (pulse distortion) measurement Method B Frequency-domain measurement Method C Overfilled launch modal bandwidth calculated from differential mode delay (OMBc) Methods A and B can be performed us
47、ing one of two launches: an overfilled launch (OFL) condition or a restricted mode launch (RML) condition. Method C is only defined for A1a.2 (and A1a.3 in preparation) multimode fibre and uses a weighted summation of DMD launch responses with the weights corresponding to an overfilled launch condit
48、ion. The relevant test method and launch condition should be chosen according to the type of fibre. NOTE 1 These test methods are commonly used in production and research facilities and are not easily accomplished in the field. NOTE 2 OFL has been used for the modal bandwidth value for LED-based app
49、lications for many years. However, no single launch condition is representative of the laser (e.g. VCSEL) sources that are used for gigabit and higher rate transmission. This fact drove the development of IEC 60793-1-49 for determining the effective modal bandwidth of laser optimized 50 m fibres. See IEC 60793-2-10:2004 or later and IEC 61280-4-1:2003 or later for more information. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated reference
