5-Tb/s Eleelr0-Optical AT刈Switching Sys1-cm巌ardware Components

tlSing Smau Optical W王)朋二Packet-Switched lntereonneetion Modllies

Nobuaki Matsuul･a妻, Kimibiro Yam血)sh上FJiji Oki2, Naoaki Yamanaka2, Takaharu Ohyama3 and Yuji Akahori3

トNTT Network Service SystenlS Laboratories, 2NTT Network hnovation Laboratories. 3N･汀Photonics Laboratories,

NTT Ctqporation

3-9-I i Midori-Oho, Musashi_no-shi, Tokyo, 180-8585 Japan

emai:1 matsuura.nobuaki@lab.nit.co.jp, Tel: ÷81-422-59-3758, Fax:十81-422-59-4549

′｣

Abstract

We have experimentally den10nStrateA a 51Tbls ATM

(asynchronous trallSfer mode) switc･hing system called

OPTIMん2 (Optically interCOnneCted multi-stage ATM

switch architecture) that uses QPtical packet-by-packet

switched WDM (wavelength division multiplexingHi皿ks for

the intra-switch inLerconneL｡tion. h this paper, we describe

the desii?, fabrication, and evaluatiotl Of the opticalWl:)M

intelCOn‡li,Ction modules developed fcEr it.

I ntrOdtrction

For the ill血S仕ueture supporting the coming broadぬnd

era, backborie ndworkswill need to be high-Speed and high-capacity. This will be aecoITIPlished by inlPrOⅥng not Only

network link syst餌はbu`talso network nde system. F肝

such high-perfomnance node systems, ATM t'asynchronous

transfer mode) switching､ which is hardware-based. has beerl

an outsulding technology,. ATM has se:veraladvantages

w抽　respect to bandwidth and quality of service etc.

Furthermore, it can also be applied to a switch core fabric of

other technologies, e.A.. for an lP (i_ntemet protocol) router,

Combined with an approprlate intばface.

We have been developing switching technology called

OPTIMA (Optically interconneded multi-sbge ATM swi血

al'ehitecture) for a high-capacity and high-density node

S_ystem i-ll. OPTIMんl developed previously has 640-Gb.･/ら

switching capacity 【2]･ Our ailTL in developing OPTTMA-2

was to expalld Llle SWitching capacitJV tO the mu7ti-Tb/'s leveL

Thjs paper desk;Tiゎes the design, fabrication, and

experimental demonstration of the optlCal WDM

interct)nr)ection modules for OPTIMA_2.

ArchiteettLre Of the Sw触hiれg SystcIT1

0PTfMA has a 3-stage switch architecture which can

avoid the internal head-of-lirle b王∝king of switched data

units. Each stage Consists of postcard-size 80-Gbl's basic

switc･h-elcmcnts using Ceramic multi-layer MCMs (multi-

chip module) t3], Using identical switch units makes ttljs

architeetLlre highly scalable. Ⅵ}e sysはm can be e.Ypanded

Simply by addirlg Switch ullits. The basic swikh-element has

eight 10-Gb･'s input and output interfaces. Th飽きinlerraCe･S

are com】ected to払ose of the lleXt Stagewithin the system.

OPTIMA岱lables significant enhancement of也e s滋tching

Capacity by using optical WDM (wavelength diyisioll

multiplexitlg) link,a for the inter-stage intercoIlneCtion.

Optical interc仇neCtion overcomes the bottlenec･k of electric-al

intercomection. At the sanle time, WDM eliminates eablil唱

mess by btmdling multiple signals onto a smgle optical的er.

Figure I shows the structure of OPTIMA｣. Each stage

has eiかt switch-elements and they are intercomeeted by

eight-wavelength optiealWDM. Each 10-Gb/s signal of the

0-780317430-4/02/'$ 1 7.00 @2002 I EEE 2002 Electronic Cornponents and Technology Conference

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WDM transmiaer and receiver. The electricalinterface of

each 2.5-Gb/s channel is demultiplexed to fLlur 622-Mb,･'s

slgnals. This eLaSeS the res出ctions on prhted circuit board

(PCBj pattei-nlng- Thus, the WDM trar5Smitter module has4: 1 multiplexeT ICs and the WDM recciv肝mOdule has I:4

demultiplexer ICswith a cl∝k data recover)･ふncti仰.

The opticalinterfaces ofぬe WDM modules were

fabricated very compactly using a　由Iica-based plwar

lightwave circuit (PLC) platfoml. On Which an AWG coupler

or deeoupler was fonned. Fur也ermore, we used PLC hybrid

integration, ､血ich erlabEes optiealdevices such as spot-size

ctmve托el integrated DFB-LDs and re丘actillg-facet PDs to be

丑ip-chip bonded onto an AWG. Optical devices al-e

inteTCOnneeLed to the PLC platfoms by Auy'sn solder. The

- ) LDs and PDs are soldered by thin Alms and bumps-- -ノ　1.eSpeCtiveiy. Figure 8 shows the cross sectionalyiews of PLC

pl atfomlS.

Figure 9 shows photographs of the WDM transmitter arld

receiver modules fabricated on PCBs. 2.5-Gb..;S electrical

signals between optical devices and electrical Circuits are

bansmitted　via thin eoaxial cables. We used a wばing

substrate in order to mount termination resistors alld pre-

ampli-ficTS dose Lo也e opticaldel･ices forthe加nsmitter and

receiver, respediyely, The wlrlng Substratealso provides

pitch corlYerSion between the PLC and coaxial connectors.

All the opticaldevices on a PLC can tx: cooled together by

one Peltier comp仰ellt integrated with a beat Sink and

a比ached (m the rear of the PCB.

We experimentai】y demonstrated the operation of the

WDM modules cormected through the AWG wavelength

fOuter, Figure 10 shows the operationa一 waveform measured

as血e output Of the WDM receiver module. The eye pattem

obtained was fair. Bit erl･Or rate meaSurernentS COnflrmed

error一定ee operation. We also experimcntaHy examined the

operation of the inLeT-Stage, OPtical WDM inielCOnneClion

subsystem including the waveleng血asslgrler alld packet

regener<ltOr, Test data cells generated bJV a pulse pattem

generator were transmitted throughthe wavdenLdh asslgmcT,optlCal WDM ll10dules, alld packet regenerrator. The resdts

show that Cells were properly converted to their assl卯6d

wavelen画s according to the routhlg bit in their header.

Therefore, we su∝essfully. conflnned the feasibility of a 5-

Tb/s switehillg SyぎtCm.

Cotl dllSio71S

Asa step in the construction of a Tb/S･class node sysはn,

We haye been developing a SWitching architecture using

opticalWIDM interconlleCtiorl. We developed 8-wavelmgth

2,5-Gh/'s WDM transmitter and reee.iver modules. The

rufmber pf wavelenが1S Wats Chosen based on the design of

the optica一 level diagram COnSidering wavelength deviation of

optical devices alld comp仰entS, It contributes to economical

efnciency by providing a loose re銃rictio王1 0n Wavelength

aceuracy･ We used PLC hybrid integration techrmlogy to

make the optiCalWDM modules compact･ We e･7iPeTlmenぬ11y

coll丘rmed the basic operations ()f WDM modules and intra-

switch optical packet-switched jnterconlleCtitln. We

sut:ceeded in demo‡鳩trating the feasibility of a multi Tb/s

switching system.

Acknowle d耶IentS

We thank all the members of the OPTIMA-2 projeCt･

Reference s

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2002 Ereclronic Components and Techno一ogy Conference