1、Elements of electrical and optical connection Test methods BS EN 259 1-605 :2002 Part 605: Optical elements - Return loss The European Standard EN 2591-605:2002 has the status ofa British Standard ICs 49.060 NO COPYING WITHOUT BSI PERIWISSION EXCEPT AS PERMITED BY COPYRIGHT LAW British Standards BS
2、EN 2591-60512002 National foreword This British Standard is the official English language version of The UKparticipation in its preparation was entrusted by Technical Committee ACE/6, Aerospace avionic electrical and fibre optic technology, to Subcommittee ACE/6/10, Aerospace - Fibre optic systems a
3、nd equipment which has the responsibility to: EN 2591-60512002. 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 - - aid enquirers
4、to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this
5、 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 found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”,
6、 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 not ofitself confer
7、 immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 5 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd.No
8、. I Date I Comments O BSI 11 July 2002 ISBN O 580 40041 7 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2591-605 June 2002 ICs 49.060 English version Aerospace series - Elements of electrical and optical connection - Test methods - Part 605: Optical elements - Return loss Srie arospatiale - O
9、rganes de connexion lectrique et optique - Mthodes dessais - Partie 605: Organes optiques - Coefficient de rflexion Luft- und Raumfahrt - Elektrische und optische Verbindungselemente - Prfverfahren - Teil 605: Optische Elemente - Rckstreuverluste This European Standard was approved by CEN on 8 Febru
10、ary 2002 CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtai
11、ned on application to the Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Cent
12、re has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUR
13、OPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2002 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 2591-6052002 E EN 2591-
14、605:2002 (E) Foreword This document (EN 2591 -605:2002) 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 t
15、he Official Services of the member countries of 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
16、withdrawn at the latest by December 2002. According to the CENKENELEC 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, It
17、aly, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom 2 EN 2591-605:2002 (E) 1 Scope This standard specifies a method of measuring the return loss of optical connection elements (including permanent connections) and fibre optic couplers. It shall be
18、 used together with EN 2591-100. 2 Normative 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 publications are listed hereafter. For dated references, su
19、bsequent 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 2591-100 Aerospace series - Elements of electrical and optical
20、connection - Test methods - Part 100: General 1) 3 Definition For the purposes of this standard, the following definition apply Return loss Ratio of reflected optical power to incident optical power 4 Preparation of specimens 4.1 standard. Cavities with unterminated contacts shall have filler plugs
21、fitted (where applicable). Specimens shall be fitted with normal accessories and terminated as specified in the product If not at standard test conditions, the specimen shall be subjected to standard test conditions and stabilized at these conditions for 24 h as defined in EN 2591-100. 4.2 Unless ot
22、herwise specified in the technical specification, the following details shall be stated : - type and length of cable/fibre; - permitted value (in dB) of the return loss; - coupler characteristics. 5 Apparatus It shall comprise : - a Light Launch System (LLS) as defined in EN 2591-100; - a Light Dete
23、ctor System (LDS) as defined in EN 2591-100; - an optical fibre Y coupler with splitting ratio Ki,j (equipped with connectors or not) whose characteristics have been established at wavelength ho under standard temperature. 1) Published as AECMA Prestandard at the date of publication of this standard
24、 3 EN 2591-605:2002 (E) 6 Method 6.1 Procedure The method is called the “Coupler method“ because the measuring device is joined around an optical fibre coupler as illustrated in figure 1. The test sequence is : a) adjust the launch conditions to 100 % for spot diameter and 110 % for numerical apertu
25、re, then connect the coupler to LLS and LDS. b) measure reflected power Po on port 2 of the coupler, its free end 3 immersed in a refractive index matching liquid. NOTE 1 the fibres. Power Po is the total amount of power reflected by the coupler plus the power backscattered by 100/110 Fusion splice
26、II- + LOS K3,2 PO f- (optional) -r- + IIC measurement Figure 1 Refractive index matching Ki,j is the coupler splitting ratio (K3,2= 0,5 for a 3 dB coupling value) A fusion splice may be used as appropriate to enable a coupler to be used for a number of cut back termination of different specimens. c)
27、 cut the fibre and insert the specimen Sx as shown in figure 2 and measure PI; NOTE 2 backscattered power. Power PI is the total amount of power reflected by the coupler and the specimen plus the fibre 100/110 4 r .I measurement Refractive index matching Figure 2 4 EN 2591-605:2002 (E) d) disconnect
28、 the specimen and remove the part B of the optical cord. Disconnect the LDS of the coupler and connect it in A. e) immerse the port 2 of the coupler in the index matching liquid and then measure power P2 (figure 3); NOTE 3 Power P2 is the total amount of power transmitted through point A of specimen
29、 Sx. 100/110 =!)-+-jY, P2 + measurement f Refractive index matching Figure 3 6.2 Final measurements and requirements Calculation of the return loss (RL) of specimen Sx Total power reflected by Sx Total power incident on Sx Reflection coefficient R= Power reflected by Sx = PI - Po Total power reflect
30、ed by Sx =- (PI-/%) K3,2 Total power incident on Sx = P2 1 P1-Po R=K3;(p2) The return loss RL of the specimen is given by : Particular attention will be paid to : - value of the refractive index at ho (source wavelength) - coupler characteristics; - fibres handling during the test (bend radius). 5 B
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