IEC 62343 3 2 Edition 1 0 201 6 05 INTERNATIONAL STANDARD Dynamic modules – Part 3 2 Performance specification templates – Optical channel monitor IE C 6 2 3 4 3 3 2 2 0 1 6 0 5 (e n ) ® THIS PUBLICAT[.]
I E C 62343 -3-2 ® Edition 201 6-05 I N TE R N ATI ON AL STAN DAR D D yn am i c m o d u l es – IEC 62343-3-2:201 6-05(en) Part 3-2 : Perform an ce speci fi cati o n tem pl ates – Opti cal ch an n el m o n i tor TH I S P U B L I C ATI O N I S C O P YR I G H T P R O TE C TE D C o p yri g h t © I E C , G e n e va , Sw i t z e rl a n d All rights reserved Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or IEC's member National Committee in the country of the requester If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local IEC member National Committee for further information IEC Central Office 3, rue de Varembé CH-1 21 Geneva 20 Switzerland Tel.: +41 22 91 02 1 Fax: +41 22 91 03 00 info@iec.ch www.iec.ch Abo u t th e I E C The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, electronic and related technologies Ab o u t I E C p u b l i c a t i o n s The technical content of IEC publications is kept under constant review by the IEC Please make sure that you have the latest edition, a corrigenda or an amendment might have been published I EC C atal og u e - webstore i ec ch /catal o g u e E l ectro ped i a - www el ectro ped i a org The stand-alone application for consulting the entire bibliographical information on IEC International Standards, Technical Specifications, Technical Reports and other documents Available for PC, Mac OS, Android Tablets and iPad The world's leading online dictionary of electronic and electrical terms containing 20 000 terms and definitions in English and French, with equivalent terms in additional languages Also known as the International Electrotechnical Vocabulary (IEV) online I EC pu bl i cati on s search - www i ec ch /search pu b I E C G l o ssary - s td i ec ch /g l ossary The advanced search enables to find IEC publications by a variety of criteria (reference number, text, technical committee,…) It also gives information on projects, replaced and withdrawn publications 65 000 electrotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publications issued since 2002 Some entries have been collected from earlier publications of IEC TC 37, 77, 86 and CISPR I EC J u st Pu bl i s h ed - webstore i ec ch /j u stp u bl i s h ed Stay up to date on all new IEC publications Just Published details all new publications released Available online and also once a month by email I E C Cu s to m er S ervi ce Cen tre - webstore i ec ch /csc If you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: csc@iec.ch I E C 62343-3-2 ® Edition 201 6-05 I N TER N ATI ON AL STAN DAR D D yn am i c m o d u l es – Part 3-2 : Perform an ce speci fi cati on tem pl ates – Opti cal ch an n el m o n i tor INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 33.1 80.99, 33.1 80.01 ISBN 978-2-8322-3364-1 Warn i n g ! M ake su re th at you obtai n ed th i s pu bl i cati on from an au th ori zed d i stri bu tor ® Registered trademark of the International Electrotechnical Commission –2– I EC 62343-3-2:201 © I EC 201 CONTENTS FOREWORD I N TRODU CTI ON Scope N ormati ve references Terms an d defin i tions Perform ance speci fication tem plate An nex A (i nformative) Backg round an d additional i nformation on this specificati on template A Backgrou nd in formation on the structu re of th is specification template A Selectin g “directi onall y correct” term in ol og y A Log ical sequ ence of parameters in Table A Perform ance parameters h ierarch ical stru ctu re A Additional i nformation abou t reference measurement bandwidth Bi bliog raph y Table – Optical ch annel moni tor speci fication template I EC 62343-3-2:201 © I EC 201 –3– I NTERNATI ONAL ELECTROTECHN I CAL COMMI SSI ON DYNAMIC MODULES – Part 3-2: Performance specification templates – Optical channel monitor FOREWORD ) Th e I n tern ati on al El ectrotech n i cal Com m i ssi on (I EC) i s a worl d wi d e org an i zati on for stan dard i zati on com pri si n g al l n ati on al el ectrotech n i cal com m i ttees (I EC N ati on al Com m i ttees) Th e obj ect of I E C i s to prom ote i n tern ati on al co-operati on on al l q u esti on s cern i n g stan dard i zati on i n th e el ectri cal an d el ectron i c fi el ds To th i s en d an d i n ad di ti on to oth er acti vi ti es, I EC pu bl i sh es I n tern ati on al Stan d ards, Tech n i cal Speci fi cati on s, Tech n i cal Reports, Pu bl i cl y Avai l abl e Speci fi cati on s (PAS) an d G u i d es (h ereafter referred to as “I EC Pu bl i cati on (s) ”) Th ei r preparati on i s en tru sted to tech n i cal com m i ttees; an y I EC N ati on al Com m i ttee i n terested i n th e su bj ect d eal t wi th m ay parti ci pate i n th i s preparatory work I n tern ati on al , g overn m en tal an d n on g overn m en tal org an i zati on s l i si n g wi th th e I EC al so parti ci pate i n th i s preparati on I EC col l aborates cl osel y wi th th e I n tern ati on al Org an i zati on for Stan d ard i zati on (I SO) i n accordan ce wi th d i ti on s d eterm i n ed by ag reem en t between th e two org an i zati on s 2) Th e form al d eci si on s or ag reem en ts of I EC on tech n i cal m atters express, as n earl y as possi bl e, an i n tern ati on al sen su s of opi n i on on th e rel evan t su bj ects si n ce each tech n i cal com m i ttee h as represen tati on from al l i n terested I EC N ati on al Com m i ttees 3) I EC Pu bl i cati on s h ave th e form of recom m en d ati on s for i n tern ati on al u se an d are accepted by I EC N ati on al Com m i ttees i n th at sen se Wh i l e al l reason abl e efforts are m ad e to en su re th at th e tech n i cal ten t of I EC Pu bl i cati on s i s accu rate, I E C can n ot be h el d respon si bl e for th e way i n wh i ch th ey are u sed or for an y m i si n terpretati on by an y en d u ser 4) I n ord er to prom ote i n tern ati on al u n i form i ty, I EC N ati on al Com m i ttees u n d ertake to appl y I EC Pu bl i cati on s tran sparen tl y to th e m axi m u m exten t possi bl e i n th ei r n ati on al an d reg i on al pu bl i cati on s An y d i verg en ce between an y I EC Pu bl i cati on an d th e correspon d i n g n ati on al or reg i on al pu bl i cati on sh al l be cl earl y i n d i cated i n th e l atter 5) I EC i tsel f d oes n ot provi d e an y attestati on of form i ty I n d epen d en t certi fi cati on bodi es provi d e form i ty assessm en t servi ces an d , i n som e areas, access to I EC m arks of form i ty I EC i s n ot respon si bl e for an y servi ces carri ed ou t by i n d epen d en t certi fi cati on bodi es 6) Al l u sers sh ou l d en su re th at th ey h ave th e l atest edi ti on of th i s pu bl i cati on 7) N o l i abi l i ty sh al l attach to I EC or i ts di rectors, em pl oyees, servan ts or ag en ts i n cl u d i n g i n d i vi du al experts an d m em bers of i ts tech n i cal com m i ttees an d I EC N ati on al Com m i ttees for an y person al i n j u ry, property d am ag e or oth er d am ag e of an y n atu re wh atsoever, wh eth er d i rect or i n d i rect, or for costs (i n cl u d i n g l eg al fees) an d expen ses ari si n g ou t of th e pu bl i cati on , u se of, or rel i an ce u pon , th i s I EC Pu bl i cati on or an y oth er I E C Pu bl i cati on s 8) Atten ti on i s d rawn to th e N orm ati ve referen ces ci ted i n th i s pu bl i cati on U se of th e referen ced pu bl i cati on s i s i n di spen sabl e for th e correct appl i cati on of th i s pu bl i cati on 9) Atten ti on i s d rawn to th e possi bi l i ty th at som e of th e el em en ts of th i s I EC Pu bl i cati on m ay be th e su bj ect of paten t ri g h ts I EC sh al l n ot be h el d respon si bl e for i d en ti fyi n g an y or al l su ch paten t ri g h ts I n tern ati onal Standard I EC 62343-3-2 h as been prepared by su bcom mi ttee 86C: Fibre optic systems and acti ve devices, of I EC tech nical comm i ttee 86: Fibre optics The text of th is docu ment is based on the fol lowin g docu m ents: CDV Report on voti n g 86C/1 324/CDV 86C/1 371 /RVC Fu ll i n formati on on the votin g for th e approval of th is document can be fou nd i n th e report on votin g i ndicated i n the above table Th is pu blication has been drafted in accordance wi th the I SO/I EC Di recti ves, Part A list of al l parts in the I EC 62343 series, pu blished u nder th e g eneral titl e can be fou nd on the I EC website Dynamic modules, –4– I EC 62343-3-2:201 © I EC 201 The com mi ttee h as decided that th e ten ts of th is pu blicati on wi l l remain unchan ged u ntil th e stabil ity date in dicated on th e I EC websi te u nder "h ttp://webstore iec ch " in the data related to the specific pu bl ication At th is date, the publ ication will be • recon firmed, • wi thdrawn , • replaced by a revised edi ti on, or • amended A bi lingu al versi on of th is pu blication m ay be issu ed at a later date I EC 62343-3-2:201 © I EC 201 –5– I NTRODUCTI ON An optical channel m oni tor (OCM) is a dynamic modu le that m easu res the optical ch aracteristics, m nly power an d frequ ency, of each ch annel presen t in a dense waveleng th di visi on mu lti plexing (DWDM ) transm ission li ne Th e OCM is typicall y connected to an optical tap cou pl er wh ich directs to th e OCM anywh ere between % an d % of th e optical sig nal in th e fibre-optic transm ission li ne The data reported by the OCM are u sed i n a reconfig u rable optical add/drop mu l ti plexer (ROADM) to dynam icall y equ alize the power in the optical ch ann els and to m oni tor the performance of the ch ann els tin u ou sl y over the l i fetim e of the system –6– I EC 62343-3-2:201 © I EC 201 DYNAMIC MODULES – Part 3-2: Performance specification templates – Optical channel monitor Scope Th is part of I EC 62343 provi des a performance speci fication tem pl ate for optical ch ann el mon itors The objective of this performance speci ficati on template is to provide a framework for the performance speci ficati on of th e optical channel monitor Addi tional specification parameters may be i nclu ded for detailed product speci ficati ons or performance speci ficati ons H owever, specification parameters speci fied in th is docum ent sh ou ld n ot be removed from the detail produ ct speci fications or perform ance speci fications Th is docu men t ou tli nes th e parameters that are u sed to speci fy the performance of th e optical ch ann el mon itor Normative references The following docu men ts, in wh ole or in part, are n orm ati vel y referenced in this docu m en t and are indispensabl e for i ts application For dated references, on ly the edition cited appli es For u ndated references, th e latest edition of th e referenced docu men t (inclu din g an y amendm ents) appl ies I EC 61 280-2-9, Fibre optic communication subsystem test procedures – Part 2-9: Digital systems – Optical signal-to-noise ratio measurement for dense wavelength-division multiplexed systems I EC 61 300-3-21 , Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 3-21: Examinations and measurements – Switching time I EC 61 300-3-29, Fibre optic interconnecting devices and passive components – Basic test and measurement procedures – Part 3-29: Examinations and measurements – Spectral transfer characteristics of DWDM devices Fibre optic interconnecting devices and passive components – Fibre optic WDM devices – Part 1: Generic specification I EC 62074-1 , I EC 62343, Dynamic modules – General and guidance Terms and definitions For the purposes of thi s docu ment, the terms an d defini ti ons g i ven i n I EC 62343 an d I EC 61 280-2-9 appl y Performance specification template Th is speci fication templ ate is a comprehensive compi lation of all the performance parameters th at may be rel evant to optical ch annel m on itors Table inclu des a colum n that in dicates i f a parameter is requ ired or optional Th e requ i red param eters i nclu de the performance I EC 62343-3-2:201 © I EC 201 –7– parameters th at are deemed necessary to form a mi nim al speci fication The optional parameters can be specified i n additi on to the requi red param eters depen ding on th e specific requ iremen ts of the transmission system for which i t is design ed The produ ct specification template is g i ven in Table The R/O colu mn refers to whether that particu lar speci fication item cou ld be considered requ ired or opti onal The notati on of “na” sig n ifies th at n o specificati on is provided in that cel l All Min and Max cel ls left blank sh all be fi lled in wi th a speci fication Table – Optical channel monitor specification template No Parameter name R/ O Min Max Unit Test method Notes a I n pu t ch an n el pl an R TH z Ch an n el freq u en cy ran g e O TH z I EC 62074-1 b I n pu t ch an n el s freq u en cy spaci n g tol eran ce R TH z U n d er si d erati on c, f I n pu t ch an n el s power d yn am i c ran g e R dB U n d er si d erati on I n pu t ch an n el s n on -u n i form i ty R n /a dB U n d er si d erati on I n pu t adj acen t ch an n el s n on -u n i form i ty O n /a dB U n d er si d erati on I n pu t ch an n el s n on -u n i form i ty for ch an n el i d en ti fi cati on O n /a dB U n d er si d erati on c I n pu t adj acen t ch an n el s n on -u n i form i ty for ch an n el i d en ti fi cati on O n /a dB U n d er si derati on c I n pu t total ban d power d yn am i c ran g e for ch an n el m easu rem en ts O d Bm U n d er si derati on 10 I n pu t total ban d power d yn am i c ran g e for total ban d power m easu rem en ts O d Bm U n d er si derati on 11 I n pu t OSN R d yn am i c ran g e R d Bm U n d er si d erati on 12 I n pu t ch an n el s bi t rates O G b/s 13 Referen ce m easu rem en t ban dwi d th R n om i n al val u e I EC 61 300-3-29, I EC 62074-1 e 14 N oi se equ i val en t ban d wi d th O n om i n al val u e U n d er si derati on e 15 Ch an n el power absol u te error R n /a 16 Ch an n el power rel ati ve error R 17 Ch an n el power vari abi l i ty 18 n /a ± val d dB U n d er si d erati on n /a dB U n d er si d erati on R n /a dB U n d er si d erati on Ch an n el power resol u ti on i n terval O n /a dB U n d er si d erati on 19 Ch an n el power pol ari zati on d epen d en t error O n /a dB U n d er si d erati on 20 Total ban d power absol u te error O n /a dB U n d er si d erati on 21 Total ban d power rel ati ve error O n /a dB U n d er si d erati on 22 Total ban d power vari abi l i ty O n /a dB U n d er si d erati on 23 Total ban d power resol u ti on i n terval O n /a dB U n d er si d erati on 24 Freq u en cy absol u te error O n /a GHz U n d er si d erati on 25 Freq u en cy rel ati ve error O n /a GHz U n d er si d erati on 26 Freq u en cy vari abi l i ty O n /a GHz U n d er si d erati on 27 Freq u en cy resol u ti on i n terval O n /a GHz U n d er si d erati on 28 Freq u en cy pol ari zati on depen den t error O n /a dB U n d er si d erati on 29 OSN R absol u te error O n /a dB U n d er si d erati on 30 OSN R rel ati ve error O n /a dB U n d er si d erati on ± val ± val ± val ± val f f –8– No Parameter name I EC 62343-3-2:201 © I EC 201 R/ O Min Max Test method Unit 31 OSN R vari abi l i ty O n /a dB U n d er si derati on 32 OSN R resol u ti on i n terval O n /a dB U n d er si derati on 33 OSN R pol ari zati on d epen den t error O n /a dB U n d er si derati on 34 Back refl ecti on R n /a dB U n d er si derati on 35 Operati n g tem peratu re R ºC - 36 Storag e tem peratu re R ºC - 37 Operati n g rel ati ve h u m i d i ty R % - 38 Storag e rel ati ve h u m i di ty R % - 39 Respon se ti m e R n /a ms I EC 61 300-3-21 40 Repeatabi l i ty ti m e i n terval R n /a ms U n d er si derati on a Notes I n pu t ch an n el pl an i s a param eter th at i s wel l su i ted i n th e text of DWDM tran sm i ssi on system s operati n g on fi xed I TU g ri d s, as d efi n ed i n I TU -T G 694 , of eq u al ch an n el spaci n g I n su ch appl i cati on s, th e freq u en cy ban d param eter i s si d ered opti on al , as i t can be d eri ved u si n g i ts d efi n i ti on an d th e i n pu t ch an n el pl an speci fi cati on H owever i n th e text of DWDM tran sm i ssi on system s operati n g on fl exi bl e I TU g ri d s of varyi n g ch an n el spaci n g , th e i n pu t ch an n el pl an i s n o l on g er a rel evan t param eter Th e frequ en cy ban d param eter takes preced en ce an d becom es a req u i red (R) param eter I n th i s case, th e m axi m u m n u m ber of ch an n el s sh al l be speci fi ed as wel l as th e g ran u l ari ty of th e fl exi bl e ban dwi d th stru ctu re N ote th at th e opti cal ch an n el m on i tor does n ot d i sti n g u i sh between opti cal ch an n el s an d opti cal su b-carri ers wi th i n a ch an n el Th e opti cal ch an n el m on i tor si m pl y perform s th e power m easu rem en t over th e speci fi ed m easu rem en t i n teg rati on ban d wi d th I t i s u n i versal l y u n d erstood th at an y opti cal power m easu rem en t sh al l be speci fi ed over an opti cal freq u en cy (or wavel en g th ) ran g e For exam pl e, opti cal spectru m an al yser (OSA) i n stru m en ts sh al l be set to a d esi red resol u ti on ban d wi d th before a spectral m easu rem en t can be perform ed Si m i l arl y, for opti cal ch an n el m on i tors, th e referen ce m easu rem en t ban d wi d th an d th e n oi se eq u i val en t ban dwi d th are key param eters wh en d efi n i n g th e perform an ce speci fi cati on Th e referen ce m easu rem en t ban d wi d th i s a param eter th at i s rel ated to ch an n el an d total power m easu rem en ts Th e opti cal ch an n el m on i tor reports th e power i n teg rated over th e referen ce m easu rem en t ban d wi d th Th e accu racy of th at m easu rem en t can on l y be d eterm i n ed by com pari n g i t to a m easu rem en t on a referen ce i n stru m en t, typi cal l y a cal i brated OSA i n stru m en t, over th e sam e referen ce m easu rem en t ban d wi d th b Th e i n pu t ch an n el s frequ en cy spaci n g tol eran ce param eter i s appl i cabl e to both fi xed an d fl exi bl e I TU g ri d speci fi cati on s I n th e case of fl exi bl e I TU g ri d s, th i s speci fi cati on m ay be broken ou t based on di fferen t ch an n el spaci n g val u es, as l asers m od u l ated at h i g h er bi t rates ten d to be speci fi ed wi th ti g h ter freq u en cy tol eran ces An al tern ati ve i s to si m pl y speci fy th e freq u en cy tol eran ces of th e i n pu t si g n al s based on th ei r bi t rate an d m odu l ati on form at c Ch an n el i d en ti fi cati on i s u sed i n th i s d ocu m en t to cover a broad ran g e of m ean i n g s d epen d i n g on th e appl i cati on I n th e text of a DWDM system tran sm i tti n g at bi t rates n o h i g h er th an 0G b/s, ch an n el i d en ti fi cati on can m ean th at th e opti cal ch an n el m on i tor sh al l report th e ch an n el s presen t I n th e text of a DWDM system tran sm i tti n g wi th ch an n el s wi th a m i x of bi t rates u p to 00 G b/s, ch an n el i den ti fi cati on can be en h an ced to d i sti n g u i sh 40 G b/s an d 00 G b/s ch an n el s from G b/s ch an n el s by th ei r spectral sh ape I n th e text of DWDM system s tran sm i tti n g wi th ch an n el s wi th a m i x of bi t rates u p to Tb/s on fl exi bl e g ri d s, th e h ost can actu al l y provi de th e ch an n el pl an to th e opti cal ch an n el m on i tor, i n wh i ch case ch an n el i d en ti fi cati on becom es n ot appl i cabl e I n pu t param eters rel ated to ch an n el i d en ti fi cati on are speci fi ed separatel y from oth er i n pu t param eters du e to th e fact th at ch an n el i d en ti fi cati on can pose u n i q u e ch al l en g es d Th e m i n i m u m an d m axi m u m ch an n el bi t rates can be speci fi ed g en eri cal l y I t can be h el pfu l for cl ari ty to speci fy th e i n pu t ch an n el s m odu l ati on form ats Th i s i n form ati on can take th e form of h i g h resol u ti on opti cal spectra to i n su re th at th e spectral sh ape i s fu l l y taken i n to accou n t i n th e perform an ce speci fi cati on of th e opti cal ch an n el m on i tor e Val u es are n om i n al Refer to I EC 61 300-3-29, an d I EC 62074-1 for ad di ti on al d etai l s f Absol u te error i s by d efi n i ti on th e d evi ati on from a referen ce m easu rem en t A g i ven m easu rem en t can be g reater or l esser th an th e referen ce m easu rem en t Th u s i t i s com m on to see th e absol u te error be speci fi ed as a pl u s or m i n u s val u e Th e speci fi cati on can th erefore be expressed wi th th e "pl u s" an d th e "m i n u s" errors l i sted respecti vel y u n d er th e m ax an d m i n col u m n s On th e oth er h an d , for al l practi cal pu rposes, th e absol u te error of cern i s th e absol u te val u e of th e error m easu red I n oth er word s, th e m ag n i tu d e of th e error m atters m ore th an i ts si g n I n Tabl e , th e param eters speci fi ed as a pl u s or m i n u s error arou n d a referen ce are d en oted wi th " ± val " i n th e m ax col u m n Bu t a speci fi cati on wi th " + val " u n d er th e M ax col u m n an d "- val " u n d er th e M i n col u m n i s an acceptabl e al tern ati ve I EC 62343-3-2:201 © I EC 201 –9– Annex A (informative) Background and additional information on this specification template A.1 Background information on the structure of this specification template A.1 Selecting “directionally correct” terminology Term i nolog y i n marketing literature is often sel ected to appear favou rable and this is tru e for th e termi nolog y for optical ch ann el mon itors As an example, datasheets can typical ly specify “channel power accu racy of ± , dB” I t wou l d be techn icall y correct bu t ambig u ou s to say that “the channel power accu racy increased from ± , dB to ± 0, dB”, because the valu e i tself decreased I t wou ld be clearer to say th at “th e ch ann el power error decreased from ± , dB to ± 0, dB” Th is last statem en t cou ld be described as bei ng “di recti on all y correct” I n th e comm ercial m arketpl ace, on th e other hand, promoting “channel power accuracy” rather th an “ch an nel power error” is preferred Th is I n ternati onal Stan dard u ti lizes termi nolog y that offers th e m ost clari ty as opposed to the term inolog y th at is more prevalen t i n th e marketplace For exam ple, in Table : • "error" was selected instead of "accu racy"; • "n on-u ni form ity" was sel ected instead of "u n iform i ty"; • "variabi li ty" was sel ected instead of "repeatabil ity"; • "resol u tion-in terval " was selected instead of "resolu tion " A.1 Logical sequence of parameters in Table The parameters l isted i n Tabl e fol low a l og ical sequ ence beg inn in g with the in put parameters, fol lowed by th e performance param eters, an d en di ng with operating parameters I n pu t param eters specify the enti re rang e of optical in pu t condi tions for whi ch the performance parameters appl y I n general , the g reater the rang e of i npu t parameters, th e g reater the specified error of an optical channel m on itor I n th is part of I EC 62343, the term inolog y for inpu t parameters is m ade expl ici t by i nclu sion of the word inpu t between parameter to For example, one i n pu t parameter is th e inpu t ch ann els non-u n iform i ty As th e inpu t channels non-u ni form ity i ncreases, the more chal len gi ng i t becomes for the channel mon itor to measure a ch ann el wi th relati vel y low optical power when su rrou nded by channels with rel atively h igh optical power Th is is becau se the accu racy of th e m easu remen t of the rel ati vel y l ow optical power channel will be impacted by optical crosstalk from the neig hbou ring chan nels wi th rel atively h ig h optical power Perform ance parameters su ch as ch ann el power absolu te error are g rouped in the m iddle of Table from parameter to 34 Operati ng param eters can be fou nd towards the end of Table from parameter 35 and inclu de the word operating in the term An example operatin g parameter is operati ng temperatu re These parameters represen t th e rang e of operating condi tions over wh ich the performance parameters shall m eet th eir speci fications I n g eneral , the broader the rang e of th e operating specifications, the more ch alleng in g i t is for th e optical channel moni tor to main tain a specified performance specification The expl ici t i den ti fication of inpu t condi tions an d operating param eters is helpful to formu late th e defini ti ons for the performance param eters: they can be gl obal ly referenced in the defi ni tions wi th th e si mple phrase “speci fied over all i npu t and operating rang es” – 10 – A.1 I EC 62343-3-2:201 © I EC 201 Performance parameters hierarchical structure The term inolog y for th e performance parameters follows a h ierarchical stru ctu re Th e hierarchical constru ct can be u sed to create all th e possible perm u tations for all the possi bl e performance parameters that can be speci fied Al l su ch perm u tations are sh own in Table Bu t typicall y, n ot all performance parameters are speci fi ed in practice To reflect this, man y such parameters are l isted as opti onal in Table The h ierarch ical stru ctu re consists of a root param eter and parameter attribu te Root parameters are: • chann el power; • total ban d power; • OSN R; • frequ ency Each of th ese root parameters can be combin ed with an y of the fol lowin g performance attribu tes: • absolu te error; • relative error; • variabil ity; • resolu tion interval Th is hierarch ical stru ctu re also facil itates the stream lining of al l the defini ti ons associated with each performance attribu te I n th is docu men t, m ost of the defini tions of the performance parameters are formed accordin g to th e foll owi ng templ ates: • [root parameter] parameter] and relevant to th is speci fied over all • [root parameter] relati ve error: th e maxim u m variati on of th e [root parameter] absolu te error, du ri ng one measu rem ent with in the response ti me, speci fi ed over al l in put and operati ng ran g es; • [root parameter] vari ability: the maxim um variation of the [root parameter] absolu te error over the repeatabi li ty tim e i nterval at a gi ven inpu t and operati ng dition , specified over all i npu t and operati ng ran g es; • [root parameter] resolu ti on in terval : the small est incremen t of the reported [root parameter] m easu remen t val u e A.2 absol u te error: the maximu m di fference between the measu red [root the calibrated reference [root parameter], (within specific condi ti ons root parameter) , du ri ng one m easu remen t with in the response ti me, inpu t an d operatin g rang es; Additional information about reference measurement bandwidth The reference measurem en t bandwi dth is a valu e selected according to the bit rate and modu lati on format of the optical sig nal s bein g m easured • Typicall y, sm aller reference measu remen t bandwidths are design ed for optical sig nals m odu lated at sym bol rates of Gb/s and bel ow • For optical sign als modu lated at sym bol rates of 40 Gb/s and above, the reference m easu remen t bandwi dth is increased to insu re that th e enti re spectru m of the si gn al is accou nted for i n the optical power measu remen t • For optical sig n als modu lated at sym bol rates of 400 Gb/s and above, th e chan nel pl ans can be defined on a fl exible g rid I n th is case, the host system can provide the reference m easu remen t bandwidth to the optical channel m oni tor for each i ndi vi du al channel in the scan I EC 62343-3-2:201 © I EC 201 – 11 – The noise equ i valen t bandwidth is a parameter that sh all be defined to accu ratel y ch aracterize th e perform ance param eters related to OSN R Since OSN R is an optional performance parameter, so is th e noise equ ivalent bandwidth • • To com pu te th e OSN R, it is u sefu l to fi rst com pu te th e si gnal power, which is the ch an nel power less th e optical n oise, both measu red i n th e specifi ed reference measu remen t bandwidth U sing the sig nal power ( Pi ) and th e optical noise ( Ni ) of th e ith channel, as wel l as the reference measu remen t ban dwi dth ( B r ) an d the n oise equi val ent bandwidth ( B m ) , the OSN R can th en be calcu lated as defined in I EC 61 280-2-9: OSNR = 0log Pi Ni + log Bm Br dB (A ) – 12 – I EC 62343-3-2:201 © I EC 201 Bibliography I TU -T G 694 , Spectral grids for WDM applications: DWDM frequency grid _ I N TE RN ATI O N AL E LE C TR OTE C H N I C AL CO M M I S SI O N , ru e d e Vare m bé PO Box 31 CH -1 21 G e n e va S wi tze rl an d Te l : + 41 Fax: + 22 9 1 22 9 0 i n fo @ i e c ch www i e c ch