1、BRITISH STANDARD BS EN 61300-3-9:1997 IEC 61300-3-9: 1997 Fibre optic interconnecting devices and passive components Basictest and measurement procedures Part 3: Examinations and measurements Section 9: Far-end crosstalk The European Standard EN61300-3-9:1997 has the status of a British Standard ICS
2、 33.180.20BSEN61300-3-9:1997 This British Standard, having been prepared under the directionof the Electrotechnical Sector Board, was published underthe authority of the Standards Board and comes intoeffect on 15July1997 BSI 09-1999 ISBN 0 580 27701 1 National foreword This British Standard is the E
3、nglish language version of EN61300-3-9:1997. It is identical with IEC61300-3-9:1997. The UK participation in its preparation was entrusted by Technical Committee EPL/86, Fibre optics, to Subcommittee EPL/86/2, Interconnecting devices and passive components, which has the responsibility to: aid enqui
4、rers to understand the text; present to the responsible international/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 re
5、presented 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 found in the BSI Standards Catalogue under the section entitled “International Standards Corre
6、spondence Index”, or 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 o
7、f itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to6 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indi
8、cated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSEN 61300-3-9:1997 BSI 09-1999 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 61300-3-9 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61300-3
9、-9 April 1997 ICS 33.180.20 English version Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part3-9:Examinations and measurements Far-end crosstalk (IEC61300-3-9:1997) Dispositifs dinterconnexion et composants passifs fibres optiques Mthodes fondament
10、ales dessais et de mesures Partie3-9: Examens et mesures Tldiaphonie (CEI61300-3-9:1997) Lichtwellenleiter Verbindungselemente und passive Bauteile Grundlegende Prf- und Meverfahren Teil3-9: Untersuchungen und Messungen Fernnebensprechen (IEC61300-3-9:1997) This European Standard was approved by CEN
11、ELEC on1997-03-11. 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 any alteration. Up-to-date lists and bibliographical references concerning such national standar
12、ds 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 made by translation under the responsibility of a CENELEC member into its own language and notifi
13、ed to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and
14、United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1997 CENELEC All rights of exploitation in any form and by any mea
15、ns reserved worldwide for CENELEC members. Ref. No. EN61300-3-9:1997EEN61300-3-9:1997 BSI 09-1999 2 Foreword The text of document86B/845/FDIS, future edition1 of IEC61300-3-9, prepared by SC86B, Fibre optic interconnecting devices and passive components, of IEC TC86, Fibre optics, was submitted to t
16、he IEC-CENELEC parallel vote and was approved by CENELEC as EN61300-3-9 on1997-03-11. The following dates were fixed: Endorsement notice The text of the International Standard IEC61300-3-9:1997 was approved by CENELEC as a European Standard without any modification. Contents Page Foreword 2 1 Genera
17、l 3 2 Apparatus 3 3 Procedure 4 4 Details to be specified 4 Figure 1 Measurement of P 0 5 Figure 2 Measurement of P 1 6 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1997-12-01 latest date by which the nat
18、ional standards conflicting with the EN have to be withdrawn (dow) 1997-12-01EN61300-3-9:1997 BSI 09-1999 3 1 General 1.1 Scope and object This part of IEC1300 describes the procedure to measure the far-end crosstalk of light between channels of a multiport M N or1 N fibre optic passive components (
19、switch, WDM or, in particular cases, fan-out). The far-end crosstalk is defined as the ratio of the optical power that goes out from a given output port to an optical power that goes out from another output port, nominally isolated from the previous one. For WDMs the signal travelling in the two out
20、put paths have different wavelengths and the far-end crosstalk corresponds to the ratio of the optical power, at a given wavelength, that goes out from the corresponding output port to an optical power, at the same wavelength, that goes out from another output port, nominally isolated from the previ
21、ous one at that wavelength. For WDM components the term isolation is more commonly used than far-end crosstalk. 1.2 General description The measurement procedure of the far-end crosstalk entails a comparison between two optical power level measurements. The reference power level is the output optica
22、l power measured from the fibre which is connected to the optical source and optimized at the same wavelength as emitted by the source in the case of WDM devices. The far-end crosstalk power level is the measured optical power at an output port that is normally isolated from the reference output por
23、t, either physically or optically (different wavelength). The far-end crosstalk is then given by the ratio of these two power level measurements, expressed in decibels. Since far-end crosstalk levels of concern for practical use of fibre optic components can be very small, even of the order of100dB,
24、 the relevant measurement can be degraded by several factors. Therefore this procedure is designed to either circumvent these factors, or to point them out so that adequate care and choice of test apparatus can be taken. Factors which can degrade a measurement of far-end crosstalk include: the coupl
25、ing of ambient light into measurement channels; the reflection of light from the ends of fibre pigtails; the spectral impurity of the light source such that far-end crosstalk at non-operational wavelengths is measured (e.g.in WDM devices); the light carried in cladding modes; the accuracy of power m
26、eter at low light levels; the fibre pigtail lengths since light can scatter (Rayleigh scattering) along the pigtails. 2 Apparatus The apparatus consists of the following elements: 2.1 Optical source S The source is pigtailed or connected to a launch optical fibre compatible with the input port of th
27、e device under test (DUT). It is also designed/conditioned such that cladding modes are suppressed at the output. For measurements of DUTs which are not inherently broadband in optical performance, the spectral output of the light source shall be characterized not only in the vicinity of the operati
28、ng wavelength range (FWHM) but also in the region of the spectral tail. This requirement can be specified as “power less than X dB below peak at wavelengths Y nm from peak output” and can be achieved by use of in-line bandpass filters. The output power of the light source should also be sufficiently
29、 high to permit a large measurement dynamic range with the power meter used. 2.2 Temporary joint TJ This is a method, device or mechanical fixture for temporarily aligning two fibre ends into a reproducible, low loss joint and polarization independent splicing. Typically, a fusion splice is used aft
30、er the polarization adjuster since mechanical splices may exhibit some polarization sensitivity if the endfaces are not perpendicular to the fibre axis. The stability of the temporary joint shall be compatible with the required measurement precision.EN61300-3-9:1997 4 BSI 09-1999 2.3 Terminations T
31、These terminations are components or techniques to suppress reflected light from the DUT output ports. Fibre terminations, marked T, shall have a high return loss. Three types of terminations are suggested: angled fibre ends; the application of an index matching material to the fibre end; attenuatio
32、n of the fibre, for example with a mandrel wrap. The fibre termination should have a return loss of at least20dB greater than the minimum far-end crosstalk absolute value to be measured. 2.4 Detector D This should be a high dynamic range power meter. It should have an operational wavelength range co
33、nsistent with the DUT and should also have the capability to zero the reference level. 3 Procedure 3.1 Connect the DUT to the light source as shown in Figure 1. The source is connected to the selected input port of the DUT by means of a TJ where appropriate or by means of a connector in the case of
34、a DUT fitted with a connector. The power meter is connected to a nominally through output port of the DUT (port “A”) which is to be measured for far-end crosstalk with another chosen output port nominally isolated from the previous one (port “B”). All other ports of the DUT are terminated (T). For W
35、DMs the source shall transmit one wavelength to the corresponding output port and the far-end crosstalk shall be evaluated at the same wavelength to another output port (port “B”), optimized at a different wavelength. In the Figure 1 and Figure 2 an example of measurement set-ups for switches and WD
36、Ms is displayed. 3.2 Turn on the light source S and allow sufficient time for it to stabilize. Measure and record P 0(dBm) or, for WDMs, P 0 ( 1 ) (dBm). 3.3 Connect the detector D to port “B” which is nominally isolated from the chosen output port (port “A”) as shown in Figure 2. Terminate port “A”
37、, maintaining such port still linked to the input port of the DUT. For a switch, that means to maintain it connected to port A. For WDMs the source shall continue to emit the same wavelength as before. 3.4 Measure and record the output power from port “B” as P 1(dBm), or for WDMs, P 1 ( 1 ) (dBm). 3
38、.5 The far-end crosstalk for this combination of ports is given by the following formula: 3.6 Repeat4.2 to4.5 for other input/output/isolated port combinations as specified. 4 Details to be specified The following details, as applicable, shall be specified in the detail specification: Input/output p
39、ort combinations of the DUT to be measured Characteristics of source S Temporary joint TJ type and characteristics Power meter D specifications Termination techniques T Performance requirements for far-end crosstalk for each specified port (input/output/isolated) combination Deviations from this tes
40、t procedure. Far-end crosstalk = P 1 P 0(dB) Isolation (for WDM) = P 1 ( 1 ) P 0 ( 1 ) (dB)EN61300-3-9:1997 BSI 09-1999 5 Figure 1a Measurement for a M N switch Figure 1bMeasurement for a 1 N WDM Figure 1 Measurement of P 0EN61300-3-9:1997 6 BSI 09-1999 Figure 2aMeasurement for a M N switch Figure 2
41、bMeasurement for a 1 N WDM Figure 2 Measurement of P 1blankBS EN 61300-3-9:1997 IEC61300-3-9: 1997 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe a
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