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Parichay Bose

Solution Architect

SMS-SF, CSI-ADM, EGI

Fiber SystemsDense Wavelength Division

Multiplexing  (DWDM

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Brie! "#er#ie$

Problems $ith increasin% net$or& 'eman's Solutions roose' ) their limitations

E#olution o! DWDM

*echnical 'etails Dra$bac&s

"n%oin% +esearch

Conclusion

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Gro$in% et$or& sa%e Patterns

Issues E.onential increase in user 'eman' !or ban'$i'th

− Doublin% o! ban'$i'th re/uirement e#ery 0-1 months

Consistency in /uality o! ser#ices ro#i'e'

2eein% the cost o! solutions at bay

Solutions Increase channel caacity3 *DM, WDM

Statistical multile.in% o! users3 Multile otical !ibers

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 Another %limse at the solutions

4 WDM (Wavelength Division Multiplexing)WDM (Wavelength Division Multiplexing) Use of optical bers to achieve higher speedsUse of optical bers to achieve higher speeds

Utilize wavelengths to multiplex usersUtilize wavelengths to multiplex users

Allow continuous channel allocation per userAllow continuous channel allocation per user

ncreases the e!ective bandwidth of existingncreases the e!ective bandwidth of existing

berber

4 "DM ("ime Division Multiplexing) "DM ("ime Division Multiplexing) #lotting of channels#lotting of channels  simultaneous userssimultaneous users

ncreasing bit rate to maximize utilization ofncreasing bit rate to maximize utilization of

given bandwidthgiven bandwidth

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5imitations o! current solutions

4 WDMWDM ne$cient usage of full capacit% of the optical berne$cient usage of full capacit% of the optical ber

&apabilit% of carr%ing signals e$cientl% over short&apabilit% of carr%ing signals e$cientl% over short

distances onl%distances onl%

4 mprovements in optical bers and narrowbandmprovements in optical bers and narrowbandlaserslasers 'irth of Dense WDM (DWDM)'irth of Dense WDM (DWDM)

4 "DM "DM Dependenc% of MuxDemux on bit rateDependenc% of MuxDemux on bit rate

imitations on bit ratesimitations on bit rates4 how fast can we go* (Decides how small the time slotshow fast can we go* (Decides how small the time slots

can be)can be)

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E#olution o! DWDM

ate+,,-.s

+  ,  ,  / 

DWD

M

0  ar l   %

+  ,  ,  - .   s 

1

 ar r  ow b  an d WDM

+,2-.sWideband WDM

+/3 channels+/3 channels

+--45-- 67z+--45-- 67z

spacingspacing542 channels542 channels

5--48-- 67z5--48-- 67zspacingspacing

5 channels5 channels+9+-nm: +;;-nm+9+-nm: +;;-nm

/83 channels/83 channels

5;4;- 67z spacing5;4;- 67z spacing

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What is DWDM6

De!inition Dense $a#elen%th 'i#ision multile.in% (DWDM is a !iber-otic

transmission techni/ue that emloys li%ht $a#elen%ths to

transmit 'ata arallel-by-bit or serial-by-character 

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7o$ 'oes DWDM !air better6 o "-E-" re/uire' Protocol ) Bit +ate in'een'ence

Increase' o#erall caacity at much lo$er cost Current !iber lant in#estment can be otimi8e' by a

!actor o! at least 9:

*ransarency Physical layer architecture suorts both *DM an'

'ata !ormats such as A*M, Gi%abit Ethernet, etc;

Scalability tili8e abun'ance o! 'ar& !ibers in metroolitan areas

an' enterrise net$or&s

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Caacity E.ansion

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Basic Comonents ) "eration

*ransmittin% Si'e 5asers $ith recise stable

$a#elen%ths "tical Multile.ers

"n the 5in& "tical !iber  "tical amli!iers

+ecei#in% Si'e Photo 'etectors "tical Demultile.ers

"tical a''<'romultile.ers

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Dra$bac&s Disersion

Chromatic 'isersion

Polari8ation mo'e 'isersion

 Attenuation Intrinsic3 Scatterin%, Absortion, etc;

E.trinsic3 Manu!acturin% Stress, En#ironment, etc;

Four $a#e mi.in% on-linear nature o! re!racti#e in'e. o! otical !iber 

5imits channel caacity o! the DWDM System

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"tical Amli!ier 

Eliminates "-E-" con#ersions

More e!!ecti#e than electronic reeaters

Isolator re#ents re!lection

5i%ht at 1=>nm or ?@=>nm is inecte' #ia the um laser  Gains 9>'B "utut Po$er ?'B

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"n%oin% De#eloments

ortel et$or&s Metro DWDM "P*era 5on% 7aul >>> "tical 5ine System

Cisco Systems "S ?:>> Metro DWDM Solution

5ucent *echnolo%ies 5amb'atreme *ransort

Wa#eStar "5S ?;0*  A%ility Communications ) C Santa Barbara

*unable 5asers use' !or multile $a#elen%ths

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Conclusion

+obust an' simle 'esi%n Wor&s entirely in the "tical 'omain

Multilies the caacity o! the net$or& many !ol'

Chea Comonents 7an'les the resent BW 'eman' cost e!!ecti#ely

Ma.imum utili8ation o! untae' resources

Best suite' !or lon%-haul net$or&s

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+e!erences

?H Intro'ucin% DWDMhtt3<<$$$;cisco;com<uni#erc'<cc<t'<'oc<ro'uct<mels<'$'m<'$'m!ns;htm

:H Fun'amentals o! DWDM *echnolo%yhtt3<<$$$;cisco;com<uni#erc'<cc<t'<'oc<ro'uct<mels<'$'m<'$'mo#r;htm

9H Dense Wa#elen%th Di#ision Multile.in% (DWDM htt3<<$$$;iec;or%<online<tutorials<'$'m

@H Dense Wa#elen%th Di#ision Multile.in% (DWDM *estin%htt3<<$$$;iec;or%<online<tutorials<'$'mtest

H JFiber-"tic Communications *echnolo%yK by D;2; Mynbae#, 5;5; Scheiner, PearsonE'ucation Asia, :>>? e'ition

0H JDense $a#e netsL !uture is clou'yK by Chaell Bro$n, EE*imeshtt3<<$$$;eetimes;com<story<"EG:>>??::?S>>9

H Cisco Systemshtt3<<$$$;cisco;com<en<S<ro'ucts<h$<otical<s?110<ro'ucts/uic&re!erence%ui'e>1?=0a>>=>>==0bb;html

=H 5ucent *echnolo%ies

htt3<<$$$;lucent;com<ro'ucts<subcate%ory<>,,C*ID:>:?-S*ID?>@=:-5"C5?,>>;html

1H ortel et$or&s3 J"P*era 5on% 7aulK ) JMetro DWDMK(htt3<<$$$;nortelnet$or&s;com<ro'ucts<>?<otera<lon%haul<'$'m< )(htt3<<$$$;nortelnet$or&s;com<ro'ucts<library<collateral<?:>>?;:->9->:;'!

?>H A%ility Communications

htt3<<a%ility;com<inter#als<in'e.;html6IDN19)!co'eN?

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