1、BSI Standards Publication Dynamic modules Part 6-9: Design guide Study of mechanisms and measurements of crosstalk in wavelength-selective switches PD IEC/TR 62343-6-9:2015National foreword This Published Document is the UK implementation of IEC/TR 62343-6- 9:2015. The UK participation in its prepar
2、ation was entrusted by Technical Committee GEL/86, Fibre optics, to Subcommittee GEL/86/3, Fibre optic systems and active devices. 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 provisi
3、ons of a contract. Users are responsible for its correct application. The British Standards Institution 2015. Published by BSI Standards Limited 2015 ISBN 978 0 580 86722 4 ICS 33.180.01; 33.180.99 Compliance with a British Standard cannot confer immunity from legal obligations. This Published Docum
4、ent was published under the authority of the Standards Policy and Strategy Committee on 31 July 2015. Amendments/corrigenda issued since publication Date Text affected PUBLISHED DOCUMENT PD IEC/TR 62343-6-9:2015 IEC TR 62343-6-9 Edition 1.0 2015-06 TECHNICAL REPORT Dynamic modules Part 6-9: Design g
5、uide Study of mechanisms and measurements of crosstalk in wavelength-selective switches INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 33.180.01; 33.180.99 ISBN 978-2-8322-2769-5 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publicatio
6、n from an authorized distributor. colour inside PD IEC/TR 62343-6-9:2015 2 IEC TR 62343-6-9:2015 IEC 2015 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope 7 2 Normative references. 7 3 Abbreviations 7 4 Study of dynamic crosstalk for WSS . 8 4.1 Static crosstalk and dynamic crosstalk . 8 4.2 Generatio
7、n mechanism of dynamic crosstalk 8 4.2.1 Configuration example of optical switching functionality 8 4.2.2 Generation mechanism 9 5 Measurement methods of dynamic crosstalk . 11 5.1 Study of measurement methods of dynamic crosstalk . 11 5.1.1 Referenced standard documents 11 5.1.2 Test configuration
8、of tuneable laser source (TLS) and optical power meter . 12 5.1.3 Test configuration of tuneable laser source, OE converter and oscilloscope . 12 5.1.4 Comparison of the measurement methods 13 5.2 Evaluation of the measurement methods 13 6 Measurement result of dynamic crosstalk . 14 6.1 MEMS type W
9、SS . 14 6.1.1 Measurement conditions 14 6.1.2 Measurement of different-channel crosstalk 14 6.1.3 Measurement of same-channel crosstalk 15 6.2 LCOS type WSS 16 6.2.1 Measurement conditions 16 6.2.2 Measurement of different-channel crosstalk 17 6.2.3 Measurement of same-channel crosstalk 17 6.3 DLP t
10、ype WSS 18 6.3.1 Measurement conditions 18 6.3.2 Measurement procedure and result. 18 6.4 Summary 20 7 Conclusion 21 Bibliography . 22 Figure 1 Block diagram of optical switching function . 9 Figure 2 Dynamic crosstalk at WSS 10 Figure 3 Dynamic crosstalk at optical coupler for multiplexing . 11 Fig
11、ure 4 Dynamic crosstalk at receiver (Rx) 11 Figure 5 Test configuration of tuneable laser source (TLS) and optical power meter . 12 Figure 6 Test configuration of tuneable laser source and oscilloscope . 13 Figure 7 Experimental set-up . 14 Figure 8 Measurement set-up of different-channel crosstalk
12、15 PD IEC/TR 62343-6-9:2015IEC TR 62343-6-9:2015 IEC 2015 3 Figure 9 Measurement result of different-channel crosstalk for MEMS type WSS . 15 Figure 10 Measurement result of same-channel crosstalk for MEMS type WSS 16 Figure 11 Measurement result of different-channel crosstalk for LCOS type WSS 17 F
13、igure 12 Measurement result of same-channel crosstalk for LCOS type WSS 18 Figure 13 Switching characteristics for 1 2 DLP type WSS . 19 Figure 14 Crosstalk measurement result of case a) for DLP type WSS 19 Figure 15 Crosstalk measurement result of case b) for DLP type WSS 20 Figure 16 Crosstalk mea
14、surement result of case c) for DLP type WSS 20 Table 1 Static crosstalk and dynamic crosstalk . 8 Table 2 Same-channel crosstalk and different-channel crosstalk . 8 Table 3 Generating mechanism of same-channel crosstalk and different-channel crosstalk . 10 PD IEC/TR 62343-6-9:2015 4 IEC TR 62343-6-9
15、:2015 IEC 2015 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ DYNAMIC MODULES Part 6-9: Design guide Study of mechanisms and measurements of crosstalk in wavelength-selective switches FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization compris
16、ing 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 Standar
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25、ative 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 respo
26、nsible for identifying any or all such patent rights. The main task of IEC technical committees is to prepare International Standards. However, a technical committee may propose the publication of a Technical Report when it has collected data of a different kind from that which is normally published
27、 as an International Standard, for example “state of the art“. IEC TR 62343-6-9, which is a Technical Report, has been prepared by subcommittee SC86C: Fibre optic systems and active devices, of IEC technical committee TC 86: Fibre optics. The text of this Technical Report is based on the following d
28、ocuments: Enquiry draft Report on voting 86C/1300/DTR 86C/1321/RVC Full information on the voting for the approval of this Technical Report can be found in the report on voting indicated in the above table. PD IEC/TR 62343-6-9:2015IEC TR 62343-6-9:2015 IEC 2015 5 This publication has been drafted in
29、 accordance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 62343 series, published under the general title Dynamic modules, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated o
30、n the IEC website 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 publication may be issued at a later date. IMPORTANT The colour inside
31、 logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer. PD IEC/TR 62343-6-9:2015 6 IEC TR 62343-6-9:2015 IEC 2015 INTRODUCTION A
32、dense wavelength division multiplexing (DWDM) system for fibre optic communication was developed in the late 1990s. The first generation DWDM systems were point-to-point optical networks. In the mid-2000s, second generation DWDM systems, typically ring networks, were developed. One of the key optica
33、l components for DWDM systems is a wavelength division multiplexing device. An AWG (arrayed waveguide grating) module has been mainly deployed for first and second generation DWDM systems. Due to the increasing demand for communication capacity, more flexible optical communication systems, such as m
34、esh networks, have been required. In the past several years, the third generation of DWDM systems, the optical cross-connect system, has been developed and deployed by some communication network carriers and is expected to be deployed worldwide. A wavelength-selective switch (WSS) module plays a key
35、 role in realizing the optical switch function in the optical cross-connect system, so that the performance of the WSS directly impacts on the performance of the optical cross-connect systems, such as the capacity, transmission distance, etc. For AWG modules, only static performance, such as inserti
36、on loss, bandwidth, pass-band ripple, polarization dependent loss (PDL), polarization mode dispersion (PMD), coherent crosstalk, etc., has been evaluated. In addition to static performance, dynamic performance during switching or changing attenuation should be taken into consideration for the WSS as
37、 a key module of optical cross-connect systems. For dynamic performance parameters, the influence not only on the controlled channel but also on other channels should be considered. Considering this background, the influence of WSS dynamic crosstalk on cross-connect system performance and the measur
38、ements of dynamic crosstalk has been demonstrated. This Technical Report is based on Optoelectronic Industry and Technology Development Association (OITDA) Technical Paper (TP), TP15/TP-2013, “Dynamic crosstalk measurement for wavelength selective switches”. PD IEC/TR 62343-6-9:2015IEC TR 62343-6-9:
39、2015 IEC 2015 7 DYNAMIC MODULES Part 6-9: Design guide Study of mechanisms and measurements of crosstalk in wavelength-selective switches 1 Scope This part of IEC 62343, which is a Technical Report, describes a study of the impact of WSS dynamic crosstalk on the optical network and includes dynamic
40、crosstalk measurement examples for three types of WSS. The generating mechanism and the generation factor of dynamic crosstalk in WSS are clarified, and the evaluation of same-channel crosstalk and different-channel crosstalk is shown to be necessary. 2 Normative references The following documents,
41、in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61300-3-21, Fibre optic inte
42、rconnecting devices and passive components Basic test and measurement procedures Part 3-21: Examinations and measurements Switching time IEC 61300-3-29, Fibre optic interconnecting devices and passive components Basic test and measurement procedures Part 3-29: Examinations and measurements Spectral
43、transfer characteristics of DWDM devices 3 Abbreviations ADD add port AWG arrayed waveguide grating COM common port CW continuous wave DLP digital light processor DRP drop port DUT device under test DWDM dense wavelength division multiplexing EXP express port LCOS liquid crystal on silicon MEMS micr
44、o electro mechanical system OE optical-to-electrical PDL polarization dependent loss PMD polarization mode dispersion TLS tuneable laser source Tx transmitter Rx receiver WSS wavelength selective switch PD IEC/TR 62343-6-9:2015 8 IEC TR 62343-6-9:2015 IEC 2015 4 Study of dynamic crosstalk for WSS 4.
45、1 Static crosstalk and dynamic crosstalk WSSs can be considered as the combination of optical spatial switches, variable optical attenuators, and DWDM devices such as AWG modules. For the WSS, dynamic crosstalk, which is the interference between ports and channels during switching and changing atten
46、uation, is generated in addition to static crosstalk. Static crosstalk has been studied, and the definition and standard measurement methods for WDM devices such as AWG modules have been established. In addition to static crosstalk, dynamic crosstalk for WSSs has to be considered because WSSs vary a
47、ttenuation and switch ports during operation. Two types of dynamic crosstalk are considered in this Technical Report: same-channel crosstalk (coherent crosstalk), and different-channel crosstalk (power crosstalk). In this sense, the word of channel refers to the signal at a particular wavelength. Th
48、e impact on signal quality of same-channel crosstalk to cross-connect systems is considered to be larger than that of different-channel crosstalk, which may be negligible. The classification of dynamic crosstalk and static crosstalk and that of same-channel crosstalk and different-channel crosstalk
49、are independent. Therefore, four combinations (dynamic-same-channel crosstalk, dynamic-different-channel crosstalk, static-same-channel crosstalk, and static-different-channel crosstalk) have to be considered. Table 1 and Table 2 show the features of static and dynamic crosstalk and same-channel and different-channel crosstalk, respectively. Table 1 Static crosstalk and dynamic crosstalk Crosstalk Description Static crosstalk Crosstalk generated d
