1
8:30am-9:00am( Invited) ThBl Optical Tcchniques for WUM Metropolitan Area arid Access Networks Nicholas .I. Wrigo A?&?’ Ilrrhoscrtosic.s .~ Resetucli, 100 Schiilz Urivc: I<ed !;rink, NJ 07701 I’lione: (73%) 345.3% IO, Fux: (732) 345-3040, I h d : ~~~~c),l.esc;ic),l.cli.;itt.colll Wavclcngtli-divisioii inultiplcxiiig (WI )M) has had tremendous impact in the long haul networks by enabling optical links that had li)rincrly cari.ied ii single chauncl to carry inultiplc clianiiels, each oil a scp;ir;itc w;ivelcngtli. Ih~is, iiifiasiructirix that hat! tjccii ncaring “libcr cxliaust” bccame capablc of ail upgrade in capacity by 21s iiiticli as two orclcrs of riiagniiutlc. ‘l’liisincrcasc, ciiablcd by advances in WDM components ancl olhxl ;implitiets, ~ieitnits calriers ’lo “minc” (lie capacity or cxistilig fiber aiitl forcst;iIl cxpciisivc tlcploymcnt of iicw optical fibers ;ilorig their routes. Sincc it was i.calizctl that this capacity could dclcr Lhc cxpentliltirc of billions of‘ dollars, research antl tlcvelopincrit of furilicr WDM techniques was stiiiiuliiictl. li bccaiiic clcx that relying oii tiinc-division iiinltiplcxiiig to solve ilic capacity ~jroblcni was iio longer ireccssary, and network architects could thcn optiinizc their- costs by 1)alancing inore complicaitctl optical i“iinctions (i.e. WDM) against inore costly clcctroaics at very high spcctls. ‘l‘hus, by not rclying on ‘I’1)M to incrcasc transpori ratcs, iiioi’c robust systems could be hilt with much inoi’c rapid delivery times. ‘I‘liis enables, aid SCI’V~S, 11 rapid incrcasc iii tclccoiniiitiiiicatioiis traffic. lhit tlic prom isc of WDM technology cxicnt~s fa[. bcyoutl iiicreascs in capacity, and iticludcs advantages in creating iiiid managing iietworks at the optical kvcl and utilizing optical traiisparcncy. In metro applic;dions, WIIM liiis also hclpctl to alleviate tlic film exhaust ~)roblciii I 1.1, tilit also offers inore fiiiictionality thai is suited io tlic unique Iirohlems confioiiiing tlie meti’opolitan iiicii. 011 one liarid, tlie metropolitan networks must connect io the high-spcetl backtionc riotwork, so lhcy inlist aggrcgitc aiitl distribute traffic iii tlic metropolitan oi’ regional ai’cas. On tlie otlicr Iiiuitl, these iictworks musi also corincct to the local access iietworks at a varicty of‘ rates, with :I vaiicly 01‘ foi-mats, :it much liner gtaniilarity. l’liesc requircirieiits fiilly iitilize scvcral of tlic salicni fixtiires of’ WIIM. Perhaps niost iml)ortaiit are bit-rate and folinait tn!iis~~arc~~cy whicli derive hm clkient optical filters aiid the wcalt non-linearity of glass at tlic powcr. levels anti tliskinccs typical foi. inctro applicaitions. ‘l‘raiisparciicy ctiahlcs miiltiplcxiiig of data stieaiiis that wordcl otherwise havc to bc tiiiippcd ~icross fimrraits ancl ciii-rici. formats: by permitting data streams to slay in their iiaiivc roriiiats arid rates, costly terminals, iiicl‘licicni utilization, aid extra maiiagcmcnt layers :iic avoitled. ’l‘liis “~~~tr~rc-~~roois” tlic rictwork, siuce iniiovattions can be iristalled later or changed out as iiccdctl or dcsircd with reduced marginal cost by usiiig llic wavelength dirnensioii. Wc discuss several optical tcchniqucs that have heeii tised to perinit thcsc desirable optical Iietwork lilnctions to be impleinenictl with iiii eye twwiiids miiiiiriiziiig network cost. Iiirst, wc examine the LIS~ of optical balltls for corinectivity in regional iictworlts [ 2~1 anti service segregatiou iii local access nctwoi~ks. I his runction, ii form oi. optical add/tlrop multiplcxiiig (OAIIM), permits bypass ill rnctro networks anti sci.vicc segr.cgation in iiccess iictworks to be implcrncntcd with 11assivcoptical componciits. I’hc passivity of thcse cO~i~J~li~litS is ii major coinpiiciit iii ilicir l>ivoIablc cost, reliability, a~irl upgr;itlc potciitial. We also illiistrste methods by whicli WUM netwoi.ks ciili be iiscd with noli-WI )M cotnporiciits. ‘I‘hcse mctliocls arc cxpcctcd to be iiiorc cost-dlfcctive ihaii strict WUM colnpoiIeIits, sincc tlicy ciin be inodular and pmtluced in high voluines. Hy Iciling passive OADMs pei,roriii tlic wavclength selective fiinctions atid using wavelengtl~-iiiserisilive coiriporieiits impress dala oii optical str~eains, several irii~~(iiiant network ftmctioiis C~II bc realized at low cost. Wc cxlcnrl lhis to cvolutionai-y paths lor LIPC access iictworks 131. ,. lleferenccs I. 2. 3. Y. Chen et al., “Mctro Optical Nct\vurkiiig, llcll I.nhs ’l’cch J., pp. 163.186, Jan-Mai~ IW9. A.A.M.S;ilcli iiiid J.M. Siminons, “Architcctufiil I’rinciplcs 01 Olilical Ilcgiorial aiid Mclropolitaii Acccss Networks,” Illlil: 1. Liglitwavc l‘cch., vol. 17(12) pp 2431- 2448 (1999) 0. Sniezko and X. l,u, “flow Much ‘1;’ antl ‘C’ in III~C~?,” SCTE lirncrg. ?‘cch., Jan 11-13, 2000, pp. 505-5 13. 0-7803~5947-W00/$10.0002000 IEEE 689

[IEEE LEOS 2000. 2000 IEEE Annual Meeting Conference Proceedings - Rio Grande, Puerto Rico (13-16 Nov. 2000)] LEOS 2000. 2000 IEEE Annual Meeting Conference Proceedings. 13th Annual

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8:30am-9:00am( Invited) ThBl

Optical Tcchniques for WUM Metropolitan Area arid Access Networks Nicholas .I . Wrigo

A?&?’ Ilrrhoscrtosic.s .~ Resetucli, 100 Schiilz Urivc: I<ed !;rink, NJ 07701 I’lione: (73%) 345.3% IO, Fux: (732) 345-3040, I h d : ~~~~c),l.esc;ic),l.cli.;itt.colll

Wavclcngtli-divisioii inultiplcxiiig (WI )M) has had tremendous impact in the long haul networks by enabling optical links that had li)rincrly cari.ied ii single chauncl to carry inultiplc clianiiels, each oil a scp;ir;itc w;ivelcngtli. Ih~is, iiifiasiructirix that hat! tjccii ncaring “libcr cxliaust” bccame capablc of ail upgrade in capacity by 21s iiiticli as two orclcrs of riiagniiutlc. ‘l’liis incrcasc, ciiablcd by advances i n WDM components ancl o l h x l ;implitiets, ~ieitnits calriers ’lo “minc” ( l ie capacity o r cxistilig fiber aiitl forcst;iIl cxpciisivc tlcploymcnt of iicw optical fibers ;ilorig their routes. Sincc it was i.calizctl that this capacity could dclcr Lhc cxpentliltirc of billions of‘ dollars, research antl tlcvelopincrit of furilicr W D M techniques was stiiiiuliiictl. l i bccaiiic c l c x that relying oii tiinc-division iiinltiplcxiiig to solve ilic capacity ~jroblcni was iio longer ireccssary, and network architects could thcn optiinizc their- costs by 1)alancing inore complicaitctl optical i“iinctions (i.e. WDM) against inore costly clcctroaics at very high spcctls. ‘l‘hus, by not rclying on ‘I’1)M to incrcasc transpori ratcs, iiioi’c robust systems could be h i l t with much inoi’c rapid delivery times. ‘I‘liis enables, aid SCI’V~S, 11 rapid incrcasc i i i tclccoiniiitiiiicatioiis traffic. lhit tlic prom isc of WDM technology cxicnt~s fa[. bcyoutl iiicreascs in capacity, and iticludcs advantages in creating iii id

managing iietworks at the optical kvcl and utilizing optical traiisparcncy. In metro applic;dions, WIIM liiis also hclpctl to alleviate tlic f i l m exhaust ~)roblciii I 1.1, tilit also offers

inore fiiiictionality thai is suited io tlic unique I i roh lems confioiiiing tlie meti’opolitan iiicii. 011 one l iar id, tlie metropolitan networks must connect io the high-spcetl backtionc riotwork, so lhcy inl ist aggrcgitc aiitl distribute traffic i i i tlic metropolitan oi’ regional ai’cas. On tlie otlicr Iiiuitl, these iictworks musi also corincct to the local access iietworks at a varicty of‘ rates, with :I vaiicly 01‘ foi-mats, :it much l iner gtaniilarity. l’liesc requircirieiits fiilly iitilize scvcral of tlic salicni fixtiires of’ WIIM. Perhaps niost iml)ortaiit are bit-rate and folinait tn! i is~~arc~~cy whicli derive h m c l k i e n t optical filters aiid the wcalt non-linearity of glass at tlic powcr. levels anti tliskinccs typical foi. inctro applicaitions. ‘l‘raiisparciicy ctiahlcs miiltiplcxiiig of data stieaiiis that wordcl otherwise havc to bc tiiiippcd ~ ic ross fimrraits a n c l ciii-rici. formats: by permitting data streams to slay i n their iiaiivc roriiiats arid rates, costly terminals, iiicl‘licicni utilization, a id extra maiiagcmcnt layers : i i c avoitled. ’l‘liis “ ~ ~ ~ t r ~ r c - ~ ~ r o o i s ” tlic rictwork, siuce iniiovattions can be iristalled later or changed out a s iiccdctl or dcsircd with reduced marginal cost by usiiig llic wavelength dirnensioii.

Wc discuss several optical tcchniqucs that have heeii tised to perinit thcsc desirable optical Iietwork lilnctions to be impleinenictl with iiii eye twwiiids miiiiiriiziiig network cost. Iiirst, wc examine the L I S ~ of optical balltls for corinectivity in regional iictworlts [ 2~1 anti service segregatiou iii local access nctwoi~ks. I his runction, ii form oi. optical add/tlrop multiplcxiiig (OAIIM), permits bypass ill rnctro networks anti sci.vicc segr.cgation in iiccess iictworks to be implcrncntcd with 11assivc optical componciits. I’hc passivity of thcse c O ~ i ~ J ~ l i ~ l i t S is ii major coinpiici it i i i ilicir l>ivoIablc cost, reliability, a~ i r l upgr;itlc potciitial. We also illiistrste methods by whicli WUM netwoi.ks ciili be iiscd with noli-WI )M cotnporiciits. ‘I‘hcse mctliocls arc cxpcctcd to be iiiorc cost-dlfcctive ihaii strict WUM colnpoiIeIits, sincc tlicy ciin be inodular and pmtluced in high voluines. Hy Iciling passive OADMs pei,roriii tlic wavclength selective fiinctions atid using wavelengtl~-iiiserisilive coiriporieiits impress dala oii optical str~eains, several i r i i ~ ~ ( i i i a n t network ftmctioiis C ~ I I bc realized at low cost. Wc cxlcnrl lhis to cvolutionai-y paths lor LIPC access iictworks 131.

,.

lleferenccs I. 2.

3 .

Y. Chen et al., “Mctro Optical Nct\vurkiiig, ” l l c l l I.nhs ’l’cch J., pp. 163.186, Jan-Mai~ IW9. A.A.M.S;ilcli iiiid J.M. Siminons, “Architcctufiil I’rinciplcs 0 1 Olilical Ilcgiorial aiid Mclropolitaii Acccss Networks,” Illlil: 1. Liglitwavc l‘cch., vol. 17(12) pp 2431- 2448 (1999) 0. Sniezko and X. l,u, “flow Much ‘1;’ antl ‘C’ in I I I ~ C ~ ? , ” SCTE lirncrg. ?‘cch., Jan 11-13, 2000, pp. 505-5 13.

0-7803~5947-W00/$10.0002000 IEEE 689