ImageVerifierCode 换一换
格式:PDF , 页数:32 ,大小:605.87KB ,
资源ID:576330      下载积分:10000 积分
快捷下载
登录下载
邮箱/手机:
温馨提示:
如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
如填写123,账号就是123,密码也是123。
特别说明:
请自助下载,系统不会自动发送文件的哦; 如果您已付费,想二次下载,请登录后访问:我的下载记录
支付方式: 支付宝扫码支付 微信扫码支付   
注意:如需开发票,请勿充值!
验证码:   换一换

加入VIP,免费下载
 

温馨提示:由于个人手机设置不同,如果发现不能下载,请复制以下地址【http://www.mydoc123.com/d-576330.html】到电脑端继续下载(重复下载不扣费)。

已注册用户请登录:
账号:
密码:
验证码:   换一换
  忘记密码?
三方登录: 微信登录  

下载须知

1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。
2: 试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。
3: 文件的所有权益归上传用户所有。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 本站仅提供交流平台,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

版权提示 | 免责声明

本文(BS EN 60793-1-49-2006 Optical fibres - Measurement methods and test procedures - Differential mode delay《光学纤维 测量方法和试验规程 差分模式时延》.pdf)为本站会员(testyield361)主动上传,麦多课文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文库(发送邮件至master@mydoc123.com或直接QQ联系客服),我们立即给予删除!

BS EN 60793-1-49-2006 Optical fibres - Measurement methods and test procedures - Differential mode delay《光学纤维 测量方法和试验规程 差分模式时延》.pdf

1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58The European Standard EN 60793-1-49:2006 has the status of a British StandardICS 33.180.10Optical f

2、ibres Part 1-49: Measurement methods and test procedures Differential mode delayBRITISH STANDARDBS EN 60793-1-49: 2006BS EN 60793-1-49:2006This British Standard was published under the authority of the Standards Policy and Strategy Committeeon 29 September 2006 BSI 2006ISBN 0 580 49288 5Amendments i

3、ssued since publicationAmd. No. Date CommentsThis publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Stand

4、ard was published by BSI. It is the UK implementation of EN 60793-1-49:2006. It is identical with IEC 60793-1-49:2006. It supersedes BS EN 60793-1-49:2003 which is withdrawn.The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/1, O

5、ptical fibres and cables.A list of organizations represented on GEL/86/1 can be obtained on request to its secretary.EUROPEAN STANDARD EN 60793-1-49 NORME EUROPENNE EUROPISCHE NORM July 2006 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechniq

6、ue Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60793-1-49:2006 E ICS 33.180.10 Supersedes EN 60793-1-49:2003Engli

7、sh version Optical fibres Part 1-49: Measurement methods and test procedures - Differential mode delay (IEC 60793-1-49:2006) Fibres optiques Partie 1-49: Mthodes de mesure et procdures dessai - Retard diffrentiel de mode (CEI 60793-1-49:2006) Lichtwellenleiter Teil 1-49: Messmethoden und Prfverfahre

8、n - Gruppenlaufzeitdifferenz (IEC 60793-1-49:2006) This European Standard was approved by CENELEC on 2006-07-01. 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 national standard without an

9、y alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language mad

10、e by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech Republic, Denmark, Estonia, Fi

11、nland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. 2 Foreword The text of document 86A/1061/FDIS, future edition 2 of IEC 60

12、793-1-49, prepared by SC 86A, Fibres and cables, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60793-1-49 on 2006-07-01. This European Standard supersedes EN 60793-1-49:2003. It adds minimum calculated effective modal bandwidth (EMBc) to

13、 the test procedures, supporting EN 60793-2-10. This standard is to be read in conjunction with EN 60793-1-1 and EN 60793-2-10. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop)

14、 2007-04-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2009-07-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60793-1-49:2006 was approved by CENELEC as a European Standard without any modific

15、ation. _ EN 60793-1-49:2006 3 CONTENTS 1 Scope.4 2 Normative references .4 3 Terms and definitions .5 4 Apparatus.6 4.1 Optical source .6 4.2 Stability.6 4.3 Launch system 6 4.4 Detection system.7 4.5 Computational equipment8 5 Sampling and specimens8 5.1 Test sample 8 5.2 Specimen endfaces .8 5.3 S

16、pecimen length8 5.4 Specimen packaging .8 5.5 Specimen positioning 8 6 Procedure 8 6.1 Adjust and measure system response .8 6.2 Adjust detection system.9 6.3 Measure the test sample .9 7 Calculations and interpretation of results10 7.1 Differential mode delay (DMD) 10 7.2 Minimum calculated effecti

17、ve modal bandwidth .10 7.3 Length normalization .12 8 Documentation .12 8.1 Report the following information for each test:.12 8.2 The following information shall be available upon request: 12 9 Specification information 12 Annex A (normative) Source spectral width limitation.14 Annex B (informative

18、) Discussion of measurement details .17 Annex C (informative) Determining DMD weights for EMBc calculation 21 Annex D (informative) EMBc calculation information .24 Annex E (informative) Comparison between this standard and ITU recommendations.27 Bibliography28 Figure B.1 Idealized DMD data 17 Table

19、 A.1 Highest expected dispersion for any of the commercially available Category A1 fibres 16 Table D.1 DMD weightings Example set 1.24 Table D.2 DMD weightings Example set 2.25 EN 60793-1-49:2006OPTICAL FIBRES Part 1-49: Measurement methods and test procedures Differential mode delay 1 Scope This pa

20、rt of IEC 60793 applies only to multimode, graded-index glass-core (category A1) fibres. The test method is commonly used in production and research facilities, but is not easily accomplished in the field. This standard describes a method for characterizing the modal structure of a graded-index mult

21、imode fibre. This information is useful for assessing the bandwidth performance of a fibre especially when the fibre is intended to support a variety of launch conditions such as those produced by standardized laser transmitters. With this method, the output from a fibre that is single-mode at the t

22、est wavelength excites the multimode fibre under test. The probe spot is scanned across the endface of the fibre under test, and the optical pulse delay is determined at specified offset positions. Two results can be produced from the same data. First, the difference in optical pulse delay time betw

23、een the fastest and slowest mode groups of the fibre under test can be determined. The user specifies the upper and lower limits of radial offset positions over which the probe fibre is scanned in order to specify desired limits of modal structure. The DMD data is then compared to DMD specifications

24、 that have been determined by modeling and experimentation to correspond to a minimum EMB for a range of transmitters. Second, the optical pulse shapes can be combined using specific weights to determine a calculated effective modal bandwidth (EMBc), and by calculating a sequence of EMBc values with

25、 different sets of weights, a minimum EMBc can be calculated, corresponding to a range of transmitters. The test quantifies the effects of interactions of the fibre modal structure and the source modal characteristics excluding the source spectral interactions with fibre chromatic dispersion. Adding

26、 the effects of chromatic dispersion and source spectral width will reduce the overall transmission bandwidth, but this is a separate calculation in most transmission models. In this test, the effects of non-zero spectral width are minimized but any residual effects will tend to increase the DMD val

27、ue and decrease the EMBc value. 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 any amendments) app

28、lies. EN 60793-1-49:2006 4 IEC 60793-1-1: Optical fibres Part 1: Measurement methods and test procedures - General and guidance IEC 60793-1-22: Optical fibres Part 1-22: Measurement methods and test procedures Length measurement IEC 60793-1-41: Optical fibres Part 1-41: Measurement methods and test

29、procedures Bandwidth. IEC 60793-1-42: Optical fibres Part 1-42: Measurement methods and test procedures Chromatic dispersion IEC 60793-1-45: Optical fibres Part 1-45: Measurement methods and test procedures - Mode field diameter IEC 60793-2-10: Optical fibres Part 2-10: Product specifications Sectio

30、nal specification for category A1 multimode fibres IEC 61280-1-4: Fibre optic communication subsystem test procedures Part 1-4: General communication subsystems Collection and reduction of two-dimensional nearfield data for multimode fibre laser transmitters 3 Terms and definitions For the purposes

31、of this document, the following terms and definitions apply. NOTE The user of this standard specifies either the maximum DMD for the outer (ROUTER) and inner (RINNER) limits of radial offset position over which the probe spot is scanned, or the minimum EMBc among the EMBc values calculated from a se

32、quence of DMD weightings. 3.1 differential mode delay DMD the estimated difference in optical pulse delay time between the fastest and slowest modes excited for all radial offset positions between and including RINNERand ROUTER 3.2 effective modal bandwith bandwidth associated with the transfer func

33、tion, H(f), of a particular laser/fibre combination 3.3 inner limit RINNERouter limit ROUTERlimits of radial offset positions on the endface of the fibre under test over which the probe spot is scanned EN 60793-1-49:2006 5 4 Apparatus 4.1 Optical source Use an optical source that introduces short du

34、ration, narrow spectral width pulses into the probe fibre. The temporal duration of the optical pulse shall be short enough to measure the intended differential delay time. The maximum duration allowed for the optical pulse, characterized as full width at 25 % of maximum amplitude, will depend both

35、on the value of DMD to be determined and the sample length. For example, if the desired length-normalized DMD limit is 0,20 ps/m over a sample of length 500 m, the DMD to be measured is 100 ps, and a pulse of duration less than 110 ps is needed. Testing to the same DMD limit in a 10 000 m length of

36、fibre requires measuring a DMD of 2 000 ps, and a pulse a wide as 2 200 ps may be used. Detailed limits are given in 6.1, and may depend on the source spectral width. Chromatic dispersion induced broadening resulting from source spectral width shall be within the limits indicated in Annex A. The req

37、uirement on spectral width may be met either by using a spectrally narrow source, or alternatively by the use of appropriate optical filtering at either the source or detection end. The centre wavelength shall be within 10 nm of the nominal specified wavelength. A mode locked titanium-sapphire laser

38、 is an example of a source usable for this application. 4.2 Stability Devices shall be available to position the input and output ends of the test specimen with sufficient stability and reproducibility to meet the conditions of 4.3 and 4.4. 4.3 Launch system The probe fibre between the light source

39、and test sample shall propagate only a single mode at the measurement wavelength. The mode field diameter of the probe fibre at shall be (8,7 2,39) 0,5 m, where is the measurement wavelength in micrometers, and the mode field diameter is determined using IEC 60793-1-45. This equation produces a mode

40、 field diameter of 5 m at 850 nm and 9 m at 1 310 nm, which corresponds to commercially available single-mode fibres. Ensure that the output of the probe fibre is single-mode. One method to do this is to strip higher order modes by wrapping the probe fibre three turns around a 25-mm diameter mandrel

41、. The output spot of the probe fibre shall be scanned across the endface of the test sample with a positional accuracy less than or equal to 0,5 m. The output beam from the probe fibre shall be perpendicular to the endface of the test sample to within an angular tolerance of less than or equal to 1,

42、0 degree. The launch system shall be capable of reproducibly centring the output spot of the probe fibre to within 1,0 m. EN 60793-1-49:2006 6 If directly coupled to the test sample, the gap between the output end of the probe fibre and the endface of the test sample shall be no more than 10 m. A fr

43、ee space optics system of lenses or mirrors may be used to image the output spot of the probe fibre onto the endface of the test sample. When using this type of launch system, care should be taken to ensure that substantially the same modes are excited in the test fibre as would be if the beam were

44、coupled directly from the output of the single-mode probe fibre. For example, a system of lenses or mirrors may be used to image the output of a single-mode fibre onto the end face of the test sample. Provide means to remove cladding light from the test sample. Often the fibre coating is sufficient

45、to perform this function. Otherwise, use cladding mode strippers near both ends of the test sample. If the fibre is retained on the cladding mode stripper(s) with small weights, care shall be taken to avoid microbending at these sites. 4.4 Detection system Use an optical detection apparatus suitable

46、 for the test wavelength. The detection apparatus shall couple all of the guided modes from the test sample onto the detectors active area, such that the detection sensitivity is not significantly mode dependent. The detector, along with any signal preamplifier, shall respond linearly (within 5 %) o

47、ver the range of power detected. The temporal response of the detector system, including any optional optical attenuator, shall not be significantly mode dependent. A specific test for mode dependence is given in 6.1. Alternatively, the detectors temporal response may be a function of offset as long

48、 as it is stable over the course of the measurement (i.e. TPULSE(r) shall fulfil the 5 % requirement of 6.1). Ringing of the detector system shall be limited such that maximum overshoot or undershoot shall be less than 5 % of the peak amplitude of the detected optical signal as measured on the refer

49、ence. The waveform of the detected optical signal shall be recorded and displayed on a suitable instrument, such as a high-speed sampling oscilloscope with calibrated time sweep. The recording system should be capable of averaging the detected waveform for multiple optical pulses. Use a delay device, such as a digital delay generator, to provide a means of triggering the detection electronics at the correct time. The delay device may t

copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
备案/许可证编号:苏ICP备17064731号-1