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1、BRITISH STANDARD AEROSPACE SERIES BS EN 2591-606:2002 Elements of electrical and optical connection Test methods Part 606: Optical elements Crosstalk The European Standard EN 2591-606:2002 has the status of a British Standard ICS 49.060 ? Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 18:13:
2、30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2591-606:2002 This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 11 July 2002 BSI 11 July 2002
3、 ISBN 0 580 40042 5 National foreword This British Standard is the official English language version of EN 2591-606:2002. The UK participation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology, to Subcommittee ACE/6/10, Aerospace F
4、ibre optic systems and equipment which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be fo
5、und in the BSI Standards Catalogue under the section entitled “International Standards Correspondence 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 Standar
6、ds are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep t
7、he UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 4, an inside back cover and a back cover. The BSI copyright date displayed in
8、this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 18:13:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2591-606 June 2002 ICS
9、49.060 English version Aerospace series - Elements of electrical and optical connection - Test methods - Part 606: Optical elements - Crosstalk Srie arospatiale - Organes de connexion lectrique et optique - Mthodes dessais - Partie 606: Organes optiques - Diaphonie Luft- und Raumfahrt - Elektrische
10、und optische Verbindungselemente - Prfverfahren - Teil 606: Optische Elemente - bersprechen This European Standard was approved by CEN on 8 February 2002. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the st
11、atus 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 Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A v
12、ersion in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, Fra
13、nce, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels
14、2002 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 2591-606:2002 E Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 18:13:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2591-606:2002 (E) 2 Foreword This document (EN 2591-6
15、06:2002) has been prepared by the European Association of Aerospace Manufacturers (AECMA). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of
16、 AECMA, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2002, and conflicting national standards shall be withdrawn at the latest by December 2002. Accor
17、ding to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, P
18、ortugal, Spain, Sweden, Switzerland and the United Kingdom Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 18:13:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2591-606:2002 (E) 3 1Scope This standard specifies a method of measuring the forward and backward crosstalk of light between multi-
19、 channel optical connection elements. It shall be used together with EN 2591-100. 2Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publication
20、s are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 2591-100Aerospa
21、ce series Elements of electrical and optical connection Test methods Part 100: General 1) EN 2591-601Aerospace series Elements of electrical and optical connection Test methods Part 601: Optical elements Insertion loss 2) TR 4257Aerospace series Elements of electrical and optical connection Relation
22、ship between the numbering systems for parts of EN 2591 3) 3Preparation of specimens 3.1Specimens shall be fitted with normal accessories and terminated as specified in the product standard. All cavities shall be fitted with terminated contacts. 3.2Unless otherwise specified in the technical specifi
23、cation, the following details shall be stated: type and length of cable/fibre; maximum permissible crosstalk (forward and backward); for specimens with more than two paths, the selection of the paths to be measured; for specimens of asymmetrical optical design the measurements shall be carried out w
24、ith each fibre alternatively excited in both directions. 4Apparatus It shall comprise: a Light Launch System (LLS) as defined in EN 2591-100; a Light Detector System (LDS) as defined in EN 2591-100; Temporary Joints (TJ) as defined in EN 2591-601; a Terminator (T) as defined in EN 2591-100 to provid
25、e a non-reflective termination. 1) Published as AECMA Prestandard at the date of publication of this standard 2) See TR 4257. 3) Published as AECMA Technical Report at the date of publication of this standard Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 18:13:30 GMT+00:00 2006, Uncontrolle
26、d Copy, (c) BSI EN 2591-606:2002 (E) 4 5Method 5.1Procedure See figure 1. a) Before inserting the specimen, connect LLS to one end of the fibre 1 and connect LDS to the opposite end. Maximize the output power and measure Po. b) Insert the specimen on fibre 1 at L/2 and introduce fibre 2 and connect
27、T. c) Connect a first LDS to adjacent fibre 2 and measure Pb. d) Connect a second LDS to the opposite end of this fibre and measure Pf Figure 1 e) Calculate the forward and backward crosstalk using the following formulae: Forward crosstalk (dB) = 10 log Po Pf Backward crosstalk (dB) = 10 log Po Pb w
28、here: Pb:backward power output of fibre 2 Pf:forward power output of fibre 2 Po:optical power in fibre 1 L/2:Cable length “L“ divided by two Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 02 18:13:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Th
29、u Nov 02 18:13:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2591-606:2002 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the inte
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