1、BSI Standards Publication Dynamic modules Part 6-7: Design guide Optical channel monitor PD IEC/TR 62343-6-7:2015National foreword This Published Document is the UK implementation of IEC/TR 62343-6-7:2015. The UK participation in its preparation was entrusted by Technical Committee GEL/86, Fibre opt
2、ics, 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 provisions of a contract. Users are responsible for its correct app
3、lication. The British Standards Institution 2015. Published by BSI Standards Limited 2015 ISBN 978 0 580 85412 5 ICS 33.180.20; 33.180.99 Compliance with a British Standard cannot confer immunity from legal obligations. This Published Document was published under the authority of the Standards Polic
4、y and Strategy Committee on 28 February 2015. Amendments issued since publication Amd. No. Date Text affected PUBLISHED DOCUMENT PD IEC/TR 62343-6-7:2015 IEC TR 62343-6-7 Edition 1.0 2015-02 TECHNICAL REPORT Dynamic modules Part 6-7: Design guide Optical channel monitor INTERNATIONAL ELECTROTECHNICA
5、L COMMISSION ICS 33.180.20; 33.180.99 ISBN 978-2-8322-2269-0 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. PD IEC/TR 62343-6-7:2015 2 IEC TR 62343-6-7:2015 IEC 2015 CONTENTS FOREWORD . 4 1 S
6、cope 6 2 Normative references 6 3 Terms, definitions and abbreviations . 6 3.1 Terms and definitions 6 3.2 Abbreviations 6 4 Existing standards . 7 5 The role of optical channel monitors in dynamic optical networks 7 5.1 General . 7 5.2 Signal performance monitoring and fault isolation . 8 5.3 Chann
7、el inventory and routing management . 8 5.4 Dynamic channel power self-management 8 6 Review of optical channel monitor technologies . 9 6.1 General . 9 6.2 Spatial wavelength dispersion and focal plane array detection 10 6.2.1 General . 10 6.2.2 Spatial wavelength dispersion technologies . 10 6.2.3
8、 One-dimensional focal plane arrays . 10 6.2.4 Signal processing capabilities 10 6.3 Dedicated photodiode per demultiplexed wavelength 11 6.3.1 General . 11 6.3.2 Demultiplexer technologies 11 6.3.3 Photodetector technologies . 11 6.3.4 Signal processing capabilities 11 6.4 Tuneable filter and singl
9、e photodiode element 11 6.4.1 General . 11 6.4.2 Tuneable filter technologies . 11 6.4.3 Photodetector technology 12 6.4.4 Signal processing capabilities 12 7 Monitoring parameters . 12 7.1 General . 12 7.2 Channel identification . 12 7.3 Channel power 13 7.4 Total power (composite power) . 13 7.5 C
10、hannel frequency 13 7.6 Optical signal to noise ratio (OSNR) 13 8 Practical considerations in preparation for standardizing optical channel monitor specifications. 14 8.1 General . 14 8.2 All-inclusive vs. break-out approaches to the specification 14 8.2.1 General . 14 8.2.2 All-inclusive approach t
11、o the optical channel monitor specification . 14 8.2.3 Break-out approach to the optical channel monitor specification 14 8.3 Integration bandwidth discussion 15 8.3.1 General . 15 8.3.2 Performing measurements referenced to the OSA . 15 PD IEC/TR 62343-6-7:2015IEC TR 62343-6-7:2015 IEC 2015 3 8.3.3
12、 Fundamental filter bandwidth limitation 15 8.3.4 Integration bandwidth selection as a function of bit rate and modulation format 15 9 Summary . 15 Bibliography 16 Figure 1 Fraction of the optical power in the multi-wavelength transmission line tapped and fed to the input of an optical channel monit
13、or for spectral analysis . 9 Figure 2 Optical channel monitors Three broad architecture categories. 9 Table 1 High level comparison of optical channel monitor and optical performance monitor features 8 PD IEC/TR 62343-6-7:2015 4 IEC TR 62343-6-7:2015 IEC 2015 INTERNATIONAL ELECTROTECHNICAL COMMISSIO
14、N _ DYNAMIC MODULES Part 6-7: Design guide Optical channel monitor 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 internatio
15、nal 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 ref
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23、 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 ap
24、plication 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. The main task of IEC technical committees is to prepare Inte
25、rnational 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 as an International Standard, for example “state of the art“. IEC 62343-6-7, which is a technical report, has bee
26、n prepared by subcommittee 86C: Fibre optic systems and active devices, of IEC technical committee 86: Fibre optics. The text of this technical report is based on the following documents: Enquiry draft Report on voting 86C/1252/DTR 86C/1274B/RVC Full information on the voting for the approval of thi
27、s technical report can be found in the report on voting indicated in the above table. PD IEC/TR 62343-6-7:2015IEC TR 62343-6-7:2015 IEC 2015 5 This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of IEC 62343 series, published under the general tit
28、le 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 on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publicati
29、on will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. PD IEC/TR 62343-6-7:2015 6 IEC TR 62343-6-7:2015 IEC 2015 DYNAMIC MODULES Part 6-7: Design guide Optical channel monitor 1 Scope This part of IEC 62343
30、, which is a technical report, describes optical channel monitor modules, one of several important classes of dynamic modules that are used in dynamic optical networks. This report includes a description of the necessity of optical channel monitors, specifically in the context of dynamic optical net
31、works, and how this is driving feature and performance requirements. This technical report surveys the different categories of optical channel monitor technologies that are being used and highlights some of their unique characteristics. Also described are different possible approaches for characteri
32、zing and specifying the performance of optical channel monitor modules. 2 Normative references The following documents, 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 refere
33、nces, the latest edition of the referenced document (including any amendments) applies. IEC 62343, Dynamic modules General and guidance ITU-T Recommendation G.697, Optical monitoring for dense wavelength division multiplexing systems 3 Terms, definitions and abbreviations 3.1 Terms and definitions F
34、or the purposes of this document, the terms and definitions given in IEC 62343 apply. 3.2 Abbreviations Abbreviation Term ASE amplified spontaneous emission DWDM dense wavelength division multiplexing InGaAs indium gallium arsenide LOS loss of signal NIR near infrared OSNR optical signal-to-noise ra
35、tio PDL polarization dependent loss ROADM reconfigurable optical add/drop multiplexers SOP state of polarization PD IEC/TR 62343-6-7:2015IEC TR 62343-6-7:2015 IEC 2015 7 4 Existing standards ITU-T Recommendation G.697 was initially approved in June 2004 by ITU-T Study Group 15 (2001-2004). This reco
36、mmendation and its subsequent revisions cover a broad scope of optical monitoring methods, including time domain methods, frequency domain methods, indirect methods, embedded methods and external methods. The recommendation reviews the full scope of optical impairments in DWDM transmission systems,
37、and it prioritizes these impairments by relative probability of occurrence, thus prioritizing the monitoring features for the channel monitor. The recommendation describes the optical impairments of high relative frequency of occurrence to be: attenuation of transmission paths; optical channel power
38、 changes due to gain variations; frequency (or wavelength) deviation from nominal. ITU-T Recommendation G.697 also proposes, but does not require, specifications relating specifically to embedded optical monitoring, including: performance of embedded optical monitoring at the DWDM receiver input; pe
39、rformance of embedded optical monitoring without OSNR; performance of embedded optical monitoring with OSNR. ITU-T Recommendation G.697 also dedicates a significant section to interpolated OSNR measurements and the difficulty of such interpolated OSNR measurements in certain network architectures. I
40、TU-T Recommendation G.697 refers to IEC 61280-2-91 1as a useful reference for additional information on OSNR measurements. It may be useful to point out that ITU-T Recommendation G.697 was drafted in 2004 in the context of point-to-point DWDM transmission networks, just before general adoption of re
41、configurable optical add/drop multiplexers (ROADM) in the network around 2005. The ROADM has since become the core element of a new generation of optical systems that have been characterized as dynamic and for which dynamic modules are required. These dynamic optical systems embody the limitations i
42、n OSNR measurements that were already anticipated in ITU-T Recommendation G.697. Recently, dynamic optical networks have expanded the role and requirements for optical channel monitor modules due to the nature of their dynamic capabilities. 5 The role of optical channel monitors in dynamic optical n
43、etworks 5.1 General Dynamic optical networks exhibit the following characteristics: The capability to express optical signals of a given wavelength through optical networking nodes in the optical domain, thus bypassing the conversion to the electrical domain; The capability to switch optical signals
44、 of a given wavelength between a set of ingress and egress optical ports; The capability to manage the optical channel attributes, including channel power, as the channels are configured to traverse particular paths through the network; The capability to support a large number of interconnected opti
45、cal rings or a multi- wavelength mesh topology. The optical channel monitor function assists with each of these capabilities as described below. _ 1Numbers in square brackets refer to the Bibliography. PD IEC/TR 62343-6-7:2015 8 IEC TR 62343-6-7:2015 IEC 2015 5.2 Signal performance monitoring and fa
46、ult isolation The capability to express optical signals of a given wavelength through nodes in the optical domain allows optical signals to bypass the conversion to the electrical domain. When suitable for the application, this provides a savings in cost. However, any signal performance monitoring a
47、nd fault isolation capabilities that reside in the electrical domain are no longer available to the network management system. This is mitigated by monitoring the signal performance in the optical domain. The optical channel monitor performs that function. In a broader sense, devices that are catego
48、rized as optical performance monitors also perform that function using more sophisticated measurements. Table 1 compares the general features of the optical channel monitor and the optical performance monitor. Table 1 High level comparison of optical channel monitor and optical performance monitor f
49、eatures Features Optical channel monitor Optical performance monitor Channel identification Required Required Channel power Required Required Channel frequency Optional Optional Optical signal-to-noise ratio Optional Required Chromatic dispersion Not applicable Optional Polarization mode dispersion Not applicable Optional Table 1 indicates that the optical performance monitor distinguishes itself from the optical channel monitor with advanced features. This typ
