TIA-455-204-A-2000 FOTP-204 Measurement of Bandwidth on Multimode Fiber.pdf

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

2、cturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for their particular need. The existence of such Standards and Publications shall not in any respect preclude any member o

3、r non-member of TIA from manufacturing or selling products not conforming to such Standards and Publications. Neither shall the existence of such Standards and Publications preclude their voluntary use by Non-TIA members, either domestically or internationally. Standards and Publications are adopted

4、 by TIA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, TIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard or Publication. This Standard does not purport to address all

5、safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. (From Project No. ANSI/TIA-PN-455

6、.204-A-R1, formulated under the cognizance of the TIA TR-42 Telecommunications Cabling Systems, TR-42.12 Subcommittee on Optical Fibers and Cables). Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION Technology (b) there is no assurance that the Document will be approved by any Committee of TIA or

7、 any other body in its present or any other form; (c) the Document may be amended, modified or changed in the standards development or any editing process. The use or practice of contents of this Document may involve the use of intellectual property rights (“IPR”), including pending or issued patent

8、s, or copyrights, owned by one or more parties. TIA makes no search or investigation for IPR. When IPR consisting of patents and published pending patent applications are claimed and called to TIAs attention, a statement from the holder thereof is requested, all in accordance with the Manual. TIA ta

9、kes no position with reference to, and disclaims any obligation to investigate or inquire into, the scope or validity of any claims of IPR. TIA will neither be a party to discussions of any licensing terms or conditions, which are instead left to the parties involved, nor will TIA opine or judge whe

10、ther proposed licensing terms or conditions are reasonable or non-discriminatory. TIA does not warrant or represent that procedures or practices suggested or provided in the Manual have been complied with as respects the Document or its contents. If the Document contains one or more Normative Refere

11、nces to a document published by another organization (“other SSO”) engaged in the formulation, development or publication of standards (whether designated as a standard, specification, recommendation or otherwise), whether such reference consists of mandatory, alternate or optional elements (as defi

12、ned in the TIA Engineering Manual, 4thedition) then (i) TIA disclaims any duty or obligation to search or investigate the records of any other SSO for IPR or letters of assurance relating to any such Normative Reference; (ii) TIAs policy of encouragement of voluntary disclosure (see Engineering Manu

13、al Section 6.5.1) of Essential Patent(s) and published pending patent applications shall apply; and (iii) Information as to claims of IPR in the records or publications of the other SSO shall not constitute identification to TIA of a claim of Essential Patent(s) or published pending patent applicati

14、ons. TIA does not enforce or monitor compliance with the contents of the Document. TIA does not certify, inspect, test or otherwise investigate products, designs or services or any claims of compliance with the contents of the Document. ALL WARRANTIES, EXPRESS OR IMPLIED, ARE DISCLAIMED, INCLUDING W

15、ITHOUT LIMITATION, ANY AND ALL WARRANTIES CONCERNING THE ACCURACY OF THE CONTENTS, ITS FITNESS OR APPROPRIATENESS FOR A PARTICULAR PURPOSE OR USE, ITS MERCHANTABILITY AND ITS NONINFRINGEMENT OF ANY THIRD PARTYS INTELLECTUAL PROPERTY RIGHTS. TIA EXPRESSLY DISCLAIMS ANY AND ALL RESPONSIBILITIES FOR TH

16、E ACCURACY OF THE CONTENTS AND MAKES NO REPRESENTATIONS OR WARRANTIES REGARDING THE CONTENTS COMPLIANCE WITH ANY APPLICABLE STATUTE, RULE OR REGULATION, OR THE SAFETY OR HEALTH EFFECTS OF THE CONTENTS OR ANY PRODUCT OR SERVICE REFERRED TO IN THE DOCUMENT OR PRODUCED OR RENDERED TO COMPLY WITH THE CO

17、NTENTS. TIA SHALL NOT BE LIABLE FOR ANY AND ALL DAMAGES, DIRECT OR INDIRECT, ARISING FROM OR RELATING TO ANY USE OF THE CONTENTS CONTAINED HEREIN, INCLUDING WITHOUT LIMITATION ANY AND ALL INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF BUSINESS, LOSS OF PROFITS,

18、 LITIGATION, OR THE LIKE), WHETHER BASED UPON BREACH OF CONTRACT, BREACH OF WARRANTY, TORT (INCLUDING NEGLIGENCE), PRODUCT LIABILITY OR OTHERWISE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. THE FOREGOING NEGATION OF DAMAGES IS A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THE

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

28、ide 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 act

29、ivities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subjec

30、t dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions deter

31、mined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Commit

32、tees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which

33、they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publicatio

34、n and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not r

35、esponsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical

36、 committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publ

37、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

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