BS EN 61300-3-7:2012 BSI Standards Publication Fibre optic interconnecting devices and passive components — Basic test and measurement procedures Part 3-7: Examinations and measurements — Wavelength dependence of attenuation and return loss of single mode components NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW raising standards worldwide™ BS EN 61300-3-7:2012 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 61300-3-7:2012 It is derived from IEC 61300-3-7:2009 It supersedes BS EN 61300-3-5:2001 and BS EN 61300-3-7:2001 which are withdrawn The CENELEC common modifications have been implemented at the appropriate places in the text The start and finish of each common modification is indicated in the text by }~ The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre optics, to Technical Committee GEL/86/2, Fibre optic interconnecting devices and passive components A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © The British Standards Institution 2012 Published by BSI Standards Limited 2012 ISBN 978 580 54286 ICS 33.180.20 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 February 2012 Amendments/corrigenda issued since publication Date Text affected EUROPEAN STANDARD EN 61300-3-7 NORME EUROPÉENNE January 2012 EUROPÄISCHE NORM ICS 33.180.20 Supersedes EN 61300-3-5:2001, EN 61300-3-7:2001 English version Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-7: Examinations and measurements Wavelength dependence of attenuation and return loss of single mode components (IEC 61300-3-7:2009, modified) Dispositifs d’interconnexion et composants passives fibres optiques Méthodes fondamentales d’essais et de mesures Partie 3-7: Examens and mesures Affaiblissement et affaiblissement de réflexion en fonction de la longueur d’onde des composants en unimodal (CEI 61300-3-7:2009, modifiée) Lichtwellenleiter Verbindungselemente und passive Bauteile Grundlegende Prüf- und Messverfahren Teil 3-7: Untersuchungen und Messungen Wellenlängenabhängigkeit von Dämpfung und Rückflussdämpfung von Einmodenbauteilen (IEC 61300-3-7:2009, modifiziert) This European Standard was approved by CENELEC on 2011-12-07 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 standards may be obtained on application to the CEN-CENELEC Management Centre 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 notified to the CEN-CENELEC Management Centre has the same status as the official versions CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels © 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members Ref No EN 61300-3-7:2012 E BS EN 61300-3-7:2012 EN 61300-3-7:2012 (E) –2– Foreword This document (EN 61300-3-7:2012) consists of the text of IEC 61300-3-7:2009 prepared by SC 86B, "Fibre optic interconnecting devices and passive components", of IEC/TC 86, "Fibre optics", together with the common modifications prepared by CLC/TC 86BXA "Fibre optic interconnect, passive and connectorised components" The following dates are fixed: • • latest date by which this document has to be implemented at national level by publication of an identical national standard or by endorsement latest date by which the national standards conflicting with this document have to be withdrawn (dop) 2012-09-07 (dow) 2012-12-07 This document supersedes EN 61300-3-7:2001 + EN 61300-3-5:2001 Changes from EN 61300-3-7:2001 are to reflect changes made to EN 61300-1 and covers unidirectional and bi-directional methods of measurement Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights Endorsement notice The text of the International Standard IEC 61300-3-7:2009 was approved by CENELEC as a European Standard with common modifications –3– BS EN 61300-3-7:2012 EN 61300-3-7:2012 (E) Annex ZA (normative) Normative references to international publications with their corresponding European publications 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) applies NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies Publication Year Title EN/HD Year IEC 61300-3-29 - Fibre optic interconnecting devices and passive EN 61300-3-29 components - Basic test and measurement procedures Part 3-29: Examinations and measurements Measurement techniques for characterising the amplitude of the spectral transfer function of DWDM components - IEC 62074-1 - Fibre optic interconnecting devices and passive EN 62074-1 components - Fibre optic WDM devices Part 1: Generic specification - BS EN 61300-3-7:2012 EN 61300-3-7:2012 (E) –4– CONTENTS FOREWORD Scope .9 Normative references .9 Abbreviations and acronyms General 11 4.1 4.2 4.3 General description 11 Spectral conditions 12 Definition 12 4.3.1 Attenuation 12 4.3.2 Return loss 13 4.4 Device under test 13 4.5 Measurement methods 14 4.5.1 Method A – Broadband light source (BBS) 14 4.5.2 Method B – Tuneable narrowband light source (TLS) 15 4.5.3 Method C – Set of multiple fixed narrowband light sources (NLS) 15 4.5.4 Method D – Tuneable OTDR 16 4.5.5 Reference method 16 Apparatus 16 5.1 Wavelength source 16 5.1.1 Method A – Broadband light source 16 5.1.2 Method B – Tuneable narrowband light source 16 5.1.3 Method C – Set of N narrowband light sources 17 5.1.4 Method D – Tuneable OTDR 17 5.1.5 Depolarizer 17 5.2 Detection system 18 5.2.1 Method A, Method B.2 and Method C.2 tuneable narrowband detection spectrum 18 5.2.2 Method B.1 and Method C.1 broadband detection spectrum 18 5.3 Branching devices 18 5.4 Termination 19 Procedure 19 6.1 Method A – broadband light source 19 6.1.1 Attenuation-only 19 6.1.2 Return-loss-only 20 6.1.3 Attenuation and return loss 21 6.2 Method B – Tuneable narrowband light source 22 6.3 Method C – Set of multiple fixed narrowband light sources 23 6.3.1 Attenuation-only 23 6.3.2 Return-loss-only 25 6.3.3 Attenuation and return loss 26 6.4 Test results 28 Details to be specified 28 7.1 Source 7.1.1 7.1.2 7.1.3 28 Broadband source 28 Tuneable or discrete narrowband light source 29 Depolarizer 29 –5– BS EN 61300-3-7:2012 EN 61300-3-7:2012 (E) 7.2 Detection system 29 7.2.1 Optical power meter 29 7.2.2 Optical spectrum analyser 29 7.3 Reference branching device 29 7.4 Termination 29 Annex A (informative) Device under test configurations, terminations and product types 30 Annex B (informative) Typical light source characteristics 32 Figure – Wavelength dependence of attenuation and return loss 13 Figure – Method A – Attenuation-only measurement 20 Figure – Method A – Return-loss-only measurement 21 Figure – Method A – Attenuation and return loss measurement 22 Figure – Method C – Attenuation-only measurement 24 Figure – Method C Return-loss-only measurement 24 Figure – Method C – Attenuation and return loss measurement 27 Figure – Wavelength dependent attenuation 28 Table – Test methods and characteristics 14 Table – Wavelength dependent attenuation and return loss 28 Table A.1 – Device under test configurations/terminations 30 Table A.2 – Possible types of passive optical components (POC) 30 Table B.1 – Types of broadband light source (BBS) and main characteristics 32 Table B.2 – Types of tuneable light source (TLS) and main characteristics 33 BS EN 61300-3-7:2012 EN 61300-3-7:2012 (E) –6– This page deliberately set blank –7– BS EN 61300-3-7:2012 EN 61300-3-7:2012 (E) INTERNATIONAL ELECTROTECHNICAL COMMISSION FIBRE OPTIC INTERCONNECTING DEVICES AND PASSIVE COMPONENTS – BASIC TEST AND MEASUREMENT PROCEDURES – Part 3-7: Examinations and measurements – Wavelength dependence of attenuation and return loss of single mode components FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees) The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”) Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work International, governmental and nongovernmental organizations liaising with the IEC also participate in this preparation IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication 6) All users should ensure that they have the latest edition of this publication 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications 8) Attention is drawn to the Normative references cited in this publication Use of the referenced publications is indispensable for the correct application of this publication 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights IEC shall not be held responsible for identifying any or all such patent rights International Standard IEC 61300-3-7 has been prepared by subcommittee 86B: Fibre optic interconnecting devices and passive components, of IEC technical committee 86: Fibre optics This second edition cancels and replaces the first edition published in 2000 It constitutes a technical revision Changes from the previous edition of this standard are to reflect changes made to IEC 613001 and covers unidirectional and bi-directional methods of measurement BS EN 61300-3-7:2012 EN 61300-3-7:2012 (E) –8– The text of this standard is based on the following documents: FDIS Report on voting 86B/2771/FDIS 86B/2803/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table This publication has been drafted in accordance with the ISO/IEC Directives, Part A list of all parts of IEC 61300 series, published under the general title, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures, can be found on the IEC website The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to the specific publication At this date, the publication will be • • • • reconfirmed, withdrawn, replaced by a revised edition, or amended A bilingual version of this standard may be issued at a later date BS EN 61300-3-7:2012 EN 61300-3-7:2012 (E) – 22 – Following Figure 4a, measure and record both optical output power levels Ptref ( λ ) and Prref ( λ ) over the wavelength range Pi(λ) BBS TND Pi(λ) BD BD ref P r (λ) BBS 2×1 BD BD TND APC 2×1 BD TND ref P t (λ) APC Adaptor BD BD ref P r (λ) TND ref P t (λ) IEC 2339/08 Figure 4a – Attenuation and return loss reference measurement Pi(λ) BBS 2×1 BD TND TND DUT Pt(λ) APC Pr(λ) Pi(λ) BBS 2×1 BD TND TND DUT Pt(λ) APC Pr(λ) IEC 2340/08 Figure 4b – Attenuation and return loss measurement Figure – Method A – Attenuation and return loss measurement 6.1.3.2 Attenuation and return loss measurement Insert the DUT as shown in Figure 4b; measure and record optical output power levels Pt ( λ ) and Pr ( λ ) over the wavelength range Calculate A( λ ) and RL( λ ) following Equations (3) and (4) 6.1.3.3 Bidirectional measurement }Invert the DUT in order to perform a bidirectional measurement The measurements taken in both dinections shall be averaged No averaging shall be done when the device is intentionally non-bidirectional.~ 6.2 Method B – Tuneable narrowband light source In all cases, when Method B is used the TLS must be depolarized in order to obtain a result which is the average over all SOPs and not just at one unknown or inapplicable SOP from the TLS itself without depolarization Method B may be used in a number of different configurations (see Table – Test methods and characteristics), such as: • Method B.1 – TLS with BBD – 23 – BS EN 61300-3-7:2012 EN 61300-3-7:2012 (E) • Method B.1.1 – step-by-step TLS with BBD in which the measurement is made one wavelength at a time over the wavelength range • Method B.1.2 – swept TLS with BBD in which the measurement is made continuously over the wavelength range • Method B.2 – TLS with TND • Method B.2.1 – step-by-step TLS with TND in which the measurement is made one wavelength at a time over the wavelength range and TLS and TND are synchronized to one another • Method B.2.2 – swept TLS with TND in which the measurement is made continuously over the wavelength range and TLS and TND are synchronized to one another In all cases, the measurement set-up and procedure are the same as in Figure and Figure and in 5.1 6.3 Method C – Set of multiple fixed narrowband light sources Method C may be used in two different configurations (see Table – Test methods and characteristics), such as: • Method C.1 – Set of N x NLS with BBD • Method C.2 – Set of N x NLS with TND In all cases, each NLS must be depolarized in order to obtain a result which is the average over all SOPs and not just at one unknown or inapplicable SOP from the NLS itself without depolarization The measurement procedure is the same for both configurations 6.3.1 6.3.1.1 Attenuation-only Reference measurement Connect each NLS to the N BD or switch and to the BBD or TND as shown in Figure 5a Depending on the DUT configuration, the connection may be either direct or with an adaptor If possible, direct connection should be preferred as it is less uncertain Following Figure 5a, measure and record optical output power levels Ptref ( λ ) for each ,n=1 N NLS over the specified wavelength range BS EN 61300-3-7:2012 EN 61300-3-7:2012 (E) – 24 – NLS1 NLS2 ••• ••• NLSN NLS2 BD ••• ••• NLSN P i (λ) P i (λ) BBD or TND BD ref P t, n=1…N (λ) N P i (λ) Adaptor N × BD or switch NLS1 BD P i (λ) N × BD or switch P i (λ) BBD or TND BD BD ref P t, n=1…N (λ) N P i (λ) IEC 2341/08 NLS1 NLS2 NLS2 BD DUT BBD or TND P t, n=1…N (λ) N P i (λ) P i (λ) P i (λ) BD ••• ••• NLSN BD N × BD or switch NLS1 P i () ããã ããã NLSN P i () N ì BD or switch Figure 5a – Attenuation reference measurement BD DUT BBD or TND BD P t, n=1…N (λ) N P i (λ) IEC 2342/08 Figure 5b – Attenuation measurement Figure – Method C – Attenuation-only measurement 6.3.1.2 Attenuation measurement Insert the DUT as shown in Figure 5b; measure and record optical output power levels Pt ,n=1 N ( λ ) over the wavelength range for each NLS Calculate A n= 1…N ( λ )as follows: ⎡ P (λ ) P ref (λ ) ⎤ [dB] An=1 N (λ ) = − 10 × ⎢log t − log t ⎥ Pi (λ ) Pi (λ ) ⎦ n =1 N ⎣ 6.3.1.3 (5) Bidirectional measurement }Invert the DUT in order to perform a bidirectional measurement The measurements taken in both dinections shall be averaged No averaging shall be done when the device is intentionally non-bidirectional.~ BS EN 61300-3-7:2012 EN 61300-3-7:2012 (E) – 25 – 6.3.2 6.3.2.1 Return-loss-only Reference measurement Connect each NLS to the N × BD or switch as shown in Figure 6a Connect the N × BD or switch and BBD or TND to × BD as shown in Figure 6a and terminate the × BD Depending on DUT configuration, the termination may be either direct or with an adaptor, as shown in Figure 6a If possible, direct connection should be preferred as it is less uncertain ( λ ) over the Following Figure 6a, measure and record optical output power levels Prref ,n=1 N P i (λ) NLS2 BD ••• ••• P i (λ) NLSN BD BD N P i (λ) × BD NLS1 N × BD or switch wavelength range Termination BD BBD or TND ref P r, n=1…N (λ) BD ••• ••• NLSN P i (λ) N P i (λ) BD BD BBD or TND Adaptor × BD NLS2 P i (λ) N × BD or switch NLS1 Termination BD BD ref P r, n=1…N (λ) IEC 2343/08 P i (λ) P i (λ) ••• ••• NLSN N P i (λ ) N P i (λ) BD BD BD BBD or TND N ì BD or switch NLS2 BD ããã ••• NLSN NLS1 P i (λ) DUT BD Termination P r, n=1…N (λ) BD BD BBD or TND × 1BD NLS2 P i (λ) × 1BD NLS1 N × BD or switch Figure 6a – Return loss reference measurement BD DUT BD P r, n=1…N (λ) Figure 6b – Return loss measurement Figure – Method C Return-loss-only measurement Termination IEC 2344/08 BS EN 61300-3-7:2012 EN 61300-3-7:2012 (E) 6.3.2.2 – 26 – Return loss measurement Insert the DUT as shown in Figure 6b; measure and record optical output power levels Pr ,n =1 N ( λ ) over the wavelength range Calculate RL ( λ )as follows: ⎡ P (λ ) P ref (λ ) ⎤ [dB] RLn=1 N (λ ) = − 10 × ⎢log r − log r ⎥ Pi (λ ) Pi (λ ) ⎦ n=1 N ⎣ 6.3.2.3 (6) Bidirectional measurement }Invert the DUT in order to perform a bidirectional measurement The measurements taken in both dinections shall be averaged No averaging shall be done when the device is intentionally non-bidirectional.~ 6.3.3 6.3.3.1 Attenuation and return loss Reference measurement Connect each NLS to the N × BD or switch, as shown in Figure 7a Connect the N × BD or switch and both BBD or TND to × BD as shown in Figure 7a Depending on DUT configuration, the connection may be either direct or with an adaptor, as shown in Figure 7a If possible, direct connection should be preferred as it is less uncertain Make sure to use an APC connector with the second BBD or TND on the side of the single output branch of the × BD, as shown in Figure 7a ref Following Figure 7a measure and record optical output power levels Ptref ,n =1 N ( λ ) and Pr ,n =1 N ( λ ) over the wavelength range BS EN 61300-3-7:2012 EN 61300-3-7:2012 (E) NLS2 NLSN NLS2 BD ••• ••• NLSN BBD or TND P i (λ) P i (λ) ref P r, n=1…N BD BD N P i (λ) APC BD BD N P i (λ) N × BD or switch NLS1 BD ããã ããã P i () ì BD P i (λ) BBD or TND BBD or TND BD ref P t, n=1…N (λ) (λ) × BD NLS1 N × BD or switch – 27 – APC Adaptor BD BBD or TND BD ref P t, n=1…N (λ) ref P r, n=1…N (λ) IEC 2345/08 P i (λ) P i (λ) ••• ••• NLSN N P i (λ) N P i (λ) BD BD BD BBD or TND N × BD or switch NLS2 BD ••• ••• NLSN NLS1 P i (λ) DUT BD BBD or TND P t, n=1…N (λ) P r, n=1…N (λ) BD BD BBD or TND × BD NLS2 P i (λ ) × BD NLS1 N × BD or switch Figure 7a – Attenuation and return loss reference measurement BD DUT BD P r, n=1…N (λ) BBD or TND P t, n=1…N (λ) IEC 2346/08 Figure 7b – Attenuation and return loss measurement Figure – Method C – Attenuation and return loss measurement Insert the DUT as shown in Figure 7b; measure and record optical output power levels Pt ,n=1 N ( λ ) and Pr ,n=1 N ( λ ) over the wavelength range Calculate A n=1…N ( λ ) and RL n=1…N( λ ) following Equations (5) and (6), respectively 6.3.3.2 Bidirectional measurement }Invert the DUT in order to perform a bidirectional measurement The measurements taken in both dinections shall be averaged No averaging shall be done when the device is intentionally non-bidirectional.~ BS EN 61300-3-7:2012 EN 61300-3-7:2012 (E) 6.4 – 28 – Test results The Table and Figure provide examples of test results Table – Wavelength dependent attenuation and return loss Wavelength (nm) Attenuation (dB) Return loss (dB) λ1 A( λ ) RL( λ ) λ2 A( λ ) RL( λ ) λ3 A( λ ) RL( λ ) λn A( λ n ) RL( λ n ) For each direction of transmission, or for each output port, if applicable, there will be a separate or superposed graph Attenuation (dB) A(λ) Wavelength (nm) IEC 2347/08 Figure – Wavelength dependent attenuation Details to be specified The following subclauses describe the details to be provided for each component of the measurement set-up 7.1 Source The following subclauses describe the details to be provided for the various sources used in the measurement set-up 7.1.1 Broadband source • Spectral power density • Total power stability • Wavelength bandwidth • Type of optical connection – 29 – 7.1.2 Tuneable or discrete narrowband light source • Power output • Power stability • Wavelength accuracy • Wavelength range • Spectral width • Type of optical connection 7.1.3 Depolarizer • Maximum loss • Maximum PDL • Minimum attainable DOP • Maximum wavelength dependency on the DOP 7.2 Detection system 7.2.1 Optical power meter • Power accuracy • Dynamic range • Power linearity • Power stability • Polarization sensitivity • Intrinsic RL ( λ ) • Type of optical connection 7.2.2 Optical spectrum analyser • Wavelength range • Wavelength accuracy • RBW • Averaging times • Dynamic range • Power linearity • Power stability • Polarization sensitivity • Intrinsic RL ( λ ) • Type of optical connection 7.3 Reference branching device • Power splitting ratio • Directivity • PDL • Intrinsic A ( λ ) 7.4 Termination • Types of termination • Minimum RL BS EN 61300-3-7:2012 EN 61300-3-7:2012 (E) BS EN 61300-3-7:2012 EN 61300-3-7:2012 (E) – 30 – Annex A (informative) Device under test configurations, terminations and product types The possible DUT configurations and terminations are described in Table A.1 Table A.1 – Device under test configurations/terminations Type Description DUT Fibre to fibre (POC) Fibre to fibre (splice or fieldmountable connector set) Fibre to plug Plug to plug (POC) Plug to plug (patchcord) Single plug (pigtail) Receptacle to receptacle (POC) Receptacle to plug (POC) POC POC POC POC The possible product types are shown in Table A.2 Table A.2 – Possible types of passive optical components (POC) POC Type Most popular application Number of ports Comments Patchcord General A( λ ) and RL( λ ) essentially defined by the connectors Coupler General 1×N Bidirectional measurement is critical Wide WDM coupler PON 1×2 Couple 1310-nm signal upstream with 1490-nm signal downstream Couple combined 1310-nm signal upstream with 1490-nm signal downstream with 1550-nm overlaid analogue video signal downstream 2×N Network protection Bidirectional measurement is critical Splitter PON 1×N BPON, N ≤ 32 GPON, N ≤ 128 EPON, N ≤ 16 or up to 32 with FEC Bidirectional measurement is critical Bidirectional measurement is critical Directivity is critical CWDM multiplexer/ demultiplexer CWDM network Fibre bragg grating (FBG) EDFA gain flattening filter 1×1 May have temperature control Dispersion compensator 1×1 Chirp FBG; may have temperature control N×1 1×N BS EN 61300-3-7:2012 EN 61300-3-7:2012 (E) – 31 – Table A.2 ( continued ) POC Type Most popular application Number of ports Comments FBG + circulators OADM 2×2 Circulator OADM 2×1 TFF WDM 1×1 Bidirectional measurement is critical 3-Port component WDM 1×2 Bidirectional measurement is critical Optical switch General 1×N Directivity, repeatability and latching are critical Optical attenuator General 1×1 Bidirectional measurement is critical Isolator General 1×1 Very lossy in backward direction Optical power limiter High power 1×1 Very lossy at high performance Optical power fuse High power 1×1 Destroyed when at full performance Mechanical splice General 1×1 Bidirectional measurement is critical Connector Field mountable 1×1 Bidirectional measurement is critical Pigtail 1×1 Bidirectional measurement is critical Very lossy at high attenuation BS EN 61300-3-7:2012 EN 61300-3-7:2012 (E) – 32 – Annex B (informative) Typical light source characteristics The main characteristics of various light sources used in the test methods are described in this annex B.1 Broadband light source The main characteristics of the BBS used in Method A are described in Table B.1 Table B.1 – Types of broadband light source (BBS) and main characteristics Main characteristics Type Spectral width nm Other names Optical power Spectral power density dBm/nm Uniformity /Flatness dB Total dBm White light source Different types of well known lamps Very wide(hard UV to far IR) Very low None LED Edge-emitting Surface-emitting Wide ( > 100, -3 dB) Low Quasi Gaussian -3 to Super LED Superluminescent SLED Relatively wide ( > 10, -3 dB) Low but better than LED Relatively +3 to +5 ASE source ASE emitted by an EDFA C-band (+L-band possible) -4, high Yes if gain flattened/2 +12/gain flattened +14/gain unflattened B.2 In the multi-W level Tuneable light source The main characteristics of the TLS used in Method B are described in Table B.2 for various laser designs BS EN 61300-3-7:2012 EN 61300-3-7:2012 (E) – 33 – Table B.2 – Types of tuneable light source (TLS) and main characteristics Parameters Wavelength Bands Tuning range (nm) Uncertainty (pm) Resolution (pm) Absolute Relative Setting Repeatability (pm) Stability (pm/h) Power Linewidth (MHz) Output, (dBm) W/O CC W CC Max 400 Typ Max Typ Max Typ Max Typ Max Max Stability (dB/h) Repeatability (dB) 10 tests Signal to SSE (dB) ± nm from peak @ 0,1 nm RBW Signal to total SSE (dB) SMSR (dB) Coherence length (m) Tuning speed (nm/s) Noise Typ ECL ITU-T 100-140 Typ Max Max ±2,5 ±2 ±10 10 ±2,5 – ±100 ±1 ±100 0,1 50-100 +6 Tuneable laser type EDFL DFB C+L C+L ± 1,1/ Δ T=20 °C ± 0,01 °C ± 2/on-chip heaters ± 4/double-stage TEC ± 15 ± 10 No data ± 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