《BS-EN-61300-3-34-1998 IEC-61300-3-34-1997.pdf》由会员分享，可在线阅读，更多相关《BS-EN-61300-3-34-1998 IEC-61300-3-34-1997.pdf（14页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS EN 61300-3-34: 1998 IEC 61300-3-34: 1997 Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3.34 Examinations and measurements Attenuation of random mated connectors The European Standard EN 61300-3-34:1997 has the status of a Br
2、itish Standard ICS 33.180.20 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:45:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61300-3-34:1998 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the
3、 Standards Board and comes into effect on 15 January 1998 BSI 04-1999 ISBN 0 580 29460 9 National foreword This British Standard is the English language version of EN 61300-3-34:1997. It is identical with IEC 61300-3-34:1997. The UK participation in its preparation was entrusted by Technical Committ
4、ee EPL/86, Fibre optics, to Subcommittee EPL/86/2, Fibre optic interconnecting devices and passive components, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep t
5、he UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old numb
6、er. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include a
7、n annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Corre
8、spondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does no
9、t of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 8 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will
10、 be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:45:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61300-3-34:1998 BSI 04-1999i Contents Page National forewordInside
11、 front cover Foreword2 Text of EN 61300-3-343 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:45:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:45:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPEN
12、NE EUROPISCHE NORM EN 61300-3-34 October 1997 ICS 33.180.20 English version Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-34: Examinations and measurements Attenuation of random mated connectors (IEC 61300-3-34:1997) Dispositifs dinterconnexi
13、on et composants passifs fibres optiques Mthodes fondamentales dessais et de mesures Partie 3-34: Examens et mesures Affaiblissement d laccouplement de connecteurs quelconques (CEI 61300-3-34:1997) Lichtwellenleiter Verbindungselemente und passive Bauteile Grundlegende Prf- und Meverfahren Teil 3-34
14、: Untersuchungen und Messungen Dmpfung von wahlfrei zusammengefgten Steckverbindern (IEC 61300-3-34:1997) This European Standard was approved by CENELEC on 1997-10-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Europea
15、n 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 Secretariat or to any CENELEC member. This European Standard exists in three official versions (Englis
16、h, 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 the official versions. CENELEC members are the national electrotechnical committees of Austria, Be
17、lgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr
18、Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1997 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61300-3-34:1997 E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:45:07 GMT+00:00 2006
19、, Uncontrolled Copy, (c) BSI EN 61300-3-34:1997 BSI 04-1999 2 Foreword The text of document 86B/984/FDIS, future edition 1 of IEC 61300-3-34, prepared by SC 86B, Fibre optic interconnecting devices and passive components, of IEC TC 86, Fibre optics, was submitted to the IEC-CENELEC parallel vote and
20、 was approved by CENELEC as EN 61300-3-34 on 1997-10-01. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC 613
21、00-3-34:1997 was approved by CENELEC as a European Standard without any modification. Contents Page Foreword2 1General3 1.1Scope and object3 1.2General description3 1.3Normative reference3 2Apparatus3 2.1Source S3 2.2Excitation unit E4 2.3Detector D4 2.4Temporary joint TJ5 2.5Fibre/cable5 3Procedure
22、5 3.1Method 1 (concatenation)5 3.2Method 26 4Details to be specified7 Annex ZA (normative) Normative references to international publications with their corresponding European publications8 Figure 1 Scheme of the measurement of P15 Figure 2 Scheme of the measurement of P25 Figure 3 Scheme of the mea
23、surement of Pi on the i-th patchcord of the chain6 Figure 4 Scheme of the measurement of P2a6 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement(dop) 1998-07-01 latest date by which the national standards conflicting
24、 with the EN have to be withdrawn(dow) 1998-07-01 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:45:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61300-3-34:1997 BSI 04-19993 1 General 1.1 Scope and object The object of this part of IEC 61300 is to describe a measurement procedure to e
25、valuate the decrease in optical power expressed in decibels, which results when a patchcord connector set, with like connectors at both ends, is randomly inserted into a length of optical fibre. The measured parameter is the attenuation, sometimes designated as insertion loss of the component. For t
26、his measurement standard reference connector sets are not required. 1.2 General description Two methods are described in the measurement procedure, both based on the use of an optical power meter (an optical detector and associated electronics for processing the signal). They provide an estimate of
27、the expected average performance that a group of patchcords (including adaptor if applicable) selected from a batch will exhibit when placed in a working optical system. Plugs and adaptor should be randomly selected so that the measurement provides a statistically unbiased estimate. Either method ma
28、y be considered as a reference method for the measurement of the attenuation of a random connector assembly formed between two patchcords. 1.2.1 Launch conditions Unless otherwise specified, the launch conditions shall be in accordance with Annex B of IEC 61300-1. It shall be compatible with the com
29、ponent being measured, and shall be specified in the detail specification. NOTEDue to their long coherence length, laser source units create a speckle pattern across the core of a multimode fibre which is unstable and which may render difficult or impossible the task of creating Case 1) or Case 2) l
30、aunch conditions in a multimode component. Consequently, laser sources should be avoided in favour of LEDs or other incoherent source units for measuring multimode components. 1.2.2 Precautions The following test requirements shall be met. 1) The power in the fibre shall not be at a level high enoug
31、h to generate non-linear scattering effects. 2) In multimode measurements a change in modal distribution at the component interface may affect the attenuation measurement. 3) The position of the fibre in the test should be fixed between the measurements of reference power and of power with the conne
32、ctor installed to avoid changes in attenuation due to bending loss. 1.3 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of this part of IEC 61300. At the time of publication, the edition indicated was valid. All no
33、rmative documents are subject to revision, and parties to agreements based on this part of IEC 61300 are encouraged to investigate the possibility of applying the most recent edition of the normative document indicated below. Members of IEC and ISO maintain registers of currently valid International
34、 Standards. IEC 61300-1:1995, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 1: General and guidance. 2 Apparatus 2.1 Source S This unit consists of an optical emitter, its fibre pigtail (if any), and associated drive electronics. It may include
35、 mechanical or electrical modulation of the optical power. It could, for example, be a LED, a laser, or a spectrally broadband source combined with an interface filter or a monochromator. The power output shall be stable within specified limits over the period of time between the measurements of Pi-
36、1 and Pi. The precise characteristics shall be compatible with the measurement requirements, and shall be specified in the detail specification, including: a) power output; b) peak wavelength; c) spectral width; Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:45:07 GMT+00:00 2006, Uncontro
37、lled Copy, (c) BSI EN 61300-3-34:1997 4 BSI 04-1999 d) coherent or incoherent; e) power output stability; f) pigtail fibre type (if any). 2.2 Excitation unit E This unit consists of a passive optical system which transmits the optical power to the device with the required launch conditions. It may c
38、onsist, for example, of a mode scrambler, an equilibrium mode simulator, such as a long length of fibre or a mode filter (eventually followed by a cladding mode stripper), or some combination of these elements. It shall be compatible with the device being measured, and shall be specified in the deta
39、il specification. 2.2.1 Mode filter If required by the detail specifications, the mode filter for multimode fibres shall consist of five close wound turns on smooth round mandrels which create fibre loop diameters as follows: NOTE 1If cabled fibres are employed, the mandrel diameter should be reduce
40、d by the cable diameter. NOTE 2The above fibre loop diameter values do not necessarily create equilibrium mode power distribution. If required by the relevant specification, a mode filter should be used in single-mode measurements between the temporary joint and the patchcord under test, and before
41、the detector. The objective of the mode filter in single-mode measurement is to remove all of the optical energy not in the primary mode. In general, a 2 m long fibre with two loops with a diameter of about 50 mm will serve as a mode filter. Details of the mode filters should be specified in the det
42、ail specification. NOTE 3The mode filters are not necessary if the fibre used between the temporary joint and the patchcord under test and those in the patchcord itself are sufficiently long for higher order modes to be highly attenuated, e.g. if both fibres are standard single-mode fibres and they
43、are longer than 2 m or if the measurements are carried out at 1 550 nm, higher order modes are certainly absent. 2.2.2 Cladding mode stripper If the cabled fibre coating has an index of refraction lower than that of the cladding, cladding mode strippers shall be placed both after the source and befo
44、re the detector. If a mode filter is used, the input cladding mode stripper shall be placed in series following the mode filter. Often the fibre coating is sufficient to perform the function of a cladding mode stripper. 2.3 Detector D This unit consists of an optical detector, the mechanism for conn
45、ecting to it, and associated detection electronics. It may include phase-sensitive detection of a mechanically or electrically modulated source unit. The connection to the detector will be with a receptacle that accepts a connector plug of the appropriate design compatible with the connector under t
46、est. The measurement sensitivity shall be stable within specified limits over the period of time required to measure the reference power and the power with the connector installed. Moreover, the change in the coupling efficiency between the fibre and the detector shall be minimized when a plug is re
47、placed with another plug. For that reason, a wide sensitive area detector shall be used. The precise characteristics of the detector shall be compatible with the measurement requirements. The following features of the detector shall be specified in the detail specification: a) maximum sensitivity; b
48、) linearity; c) wavelength of the maximum sensitivity; d) range of wavelength sensitivity; e) stability; f) pigtail fibre type (if any); g) fibre to detector connection. Core size 4m Fibre loop diameter mm 5018 62,520 10025 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 12:45:07 GMT+00:00 20
49、06, Uncontrolled Copy, (c) BSI EN 61300-3-34:1997 BSI 04-19995 2.4 Temporary joint TJ This is a method, device, or mechanical fixture for temporarily aligning two fibre ends into a stable, reproducible, low-loss joint. It may, for example, be a precision V-groove vacuum chuck, micromanipulator, or a fusion or mechanical splice. The temporary joint shall be stable to within specified limits over the time required to measure the reference power and power with the connector installed. A suitable refractive index matching materi