OXC (optical cross-connect) yog ib qho kev hloov pauv ntawm ROADM (Reconfigurable Optical Add-Drop Multiplexer).
Raws li lub ntsiab hloov pauv ntawm cov tes hauj lwm optical, qhov scalability thiab tus nqi-zoo ntawm optical cross-connects (OXCs) tsis yog tsuas yog txiav txim siab qhov yooj ywm ntawm cov topology network tab sis kuj cuam tshuam ncaj qha rau kev tsim kho thiab kev ua haujlwm thiab kev saib xyuas cov nqi ntawm cov tes hauj lwm optical loj. Ntau hom OXCs qhia txog qhov sib txawv tseem ceeb hauv kev tsim qauv vaj tsev thiab kev siv ua haujlwm.
Daim duab hauv qab no qhia txog ib qho qauv CDC-OXC (Colorless Directionless Contentionless Optical Cross-Connect) ib txwm muaj, uas siv cov wavelength selective switches (WSSs). Ntawm sab kab, 1 × N thiab N × 1 WSSs ua haujlwm ua cov ingress/egress modules, thaum M × K WSSs ntawm sab ntxiv/tso tswj kev ntxiv thiab tso ntawm wavelengths. Cov modules no tau sib txuas ua ke ntawm cov fibers optical hauv OXC backplane.
Daim Duab: Kev Tsim Kho CDC-OXC Ib Txwm Muaj
Qhov no kuj tseem tuaj yeem ua tiav los ntawm kev hloov lub backplane mus rau Spanke network, ua rau peb lub Spanke-OXC architecture.
Daim Duab: Spanke-OXC Architecture
Daim duab saum toj no qhia tau hais tias ntawm sab kab, OXC cuam tshuam nrog ob hom chaw nres nkoj: chaw nres nkoj kev taw qhia thiab chaw nres nkoj fiber. Txhua qhov chaw nres nkoj kev taw qhia sib raug rau qhov kev taw qhia ntawm thaj chaw ntawm OXC hauv lub network topology, thaum txhua qhov chaw nres nkoj fiber sawv cev rau ib khub ntawm cov fibers bidirectional hauv chaw nres nkoj kev taw qhia. Ib qho chaw nres nkoj kev taw qhia muaj ntau khub fiber bidirectional (piv txwv li, ntau qhov chaw nres nkoj fiber).
Txawm hais tias Spanke-based OXC ua tiav qhov kev hloov pauv tsis txwv los ntawm kev tsim qauv backplane sib txuas tag nrho, nws cov kev txwv tau dhau los ua qhov tseem ceeb thaum cov tsheb khiav hauv network nce siab. Qhov txwv ntawm qhov chaw nres nkoj ntawm cov lag luam wavelength selective switches (WSSs) (piv txwv li, qhov siab tshaj plaws tam sim no txhawb nqa yog 1 × 48 chaw nres nkoj, xws li Finisar's FlexGrid Twin 1 × 48) txhais tau tias kev nthuav dav ntawm OXC qhov ntev yuav tsum tau hloov tag nrho cov khoom siv kho vajtse, uas kim heev thiab tiv thaiv kev siv cov khoom siv uas twb muaj lawm.
Txawm tias muaj lub OXC architecture siab raws li Clos networks, nws tseem vam khom rau M × N WSSs kim, ua rau nws nyuaj rau ua kom tau raws li qhov yuav tsum tau hloov kho me ntsis.
Txhawm rau daws qhov teeb meem no, cov kws tshawb fawb tau tawm tswv yim txog ib lub hybrid architecture tshiab: HMWC-OXC (Hybrid MEMS thiab WSS Clos Network). Los ntawm kev koom ua ke microelectromechanical systems (MEMS) thiab WSS, lub architecture no tswj tau qhov kev ua tau zoo ze li ntawm tsis thaiv thaum txhawb nqa "them-raws li-koj-loj hlob", muab txoj hauv kev txhim kho tus nqi tsim nyog rau cov neeg teb xov tooj optical network.
Tus qauv tsim tseem ceeb ntawm HMWC-OXC nyob hauv nws cov qauv Clos network peb txheej.
Daim Duab: Spanke-OXC Architecture Raws Li HMWC Networks
Cov MEMS optical switches uas muaj qhov ntev siab tau muab tso rau ntawm cov txheej input thiab output, xws li qhov ntsuas 512 × 512 uas tam sim no txhawb nqa los ntawm cov thev naus laus zis tam sim no, los tsim cov chaw nres nkoj loj. Cov txheej nruab nrab muaj ntau lub modules Spanke-OXC me me, sib txuas ua ke ntawm "T-ports" los txo qhov kev sib tsoo sab hauv.
Thaum pib, cov neeg teb xov tooj tuaj yeem tsim cov khoom siv raws li Spanke-OXC uas twb muaj lawm (piv txwv li, 4 × 4 nplai), tsuas yog xa cov MEMS switches (piv txwv li, 32 × 32) ntawm cov txheej nkag thiab cov txheej tso zis, thaum khaws ib lub module Spanke-OXC hauv txheej nruab nrab (hauv qhov no, tus lej ntawm T-ports yog xoom). Thaum cov kev xav tau ntawm lub network nce ntxiv, cov modules Spanke-OXC tshiab maj mam ntxiv rau txheej nruab nrab, thiab T-ports tau teeb tsa los txuas cov modules.
Piv txwv li, thaum nthuav tus naj npawb ntawm cov txheej nruab nrab ntawm ib mus rau ob, tus naj npawb ntawm T-ports raug teeb tsa rau ib qho, ua rau tag nrho qhov ntev ntawm plaub mus rau rau.
Daim Duab: Piv Txwv HMWC-OXC
Cov txheej txheem no ua raws li qhov kev txwv tsis pub ua M > N × (S − T), qhov twg:
M yog tus naj npawb ntawm cov chaw nres nkoj MEMS,
N yog tus naj npawb ntawm cov modules txheej nruab nrab,
S yog tus naj npawb ntawm cov chaw nres nkoj hauv ib qho Spanke-OXC, thiab
T yog tus naj npawb ntawm cov chaw nres nkoj sib txuas.
Los ntawm kev kho cov kev ntsuas no dynamically, HMWC-OXC tuaj yeem txhawb nqa kev nthuav dav maj mam los ntawm qhov ntsuas pib mus rau qhov ntsuas lub hom phiaj (piv txwv li, 64 × 64) yam tsis tau hloov tag nrho cov khoom siv kho vajtse ib zaug.
Txhawm rau txheeb xyuas qhov kev ua tau zoo tiag tiag ntawm cov qauv no, pab pawg tshawb fawb tau ua qhov kev sim ua raws li cov kev thov dynamic optical path.
Daim Duab: Kev Thaiv Kev Ua Haujlwm ntawm HMWC Network
Qhov kev sim siv tus qauv tsheb khiav Erlang, xav tias cov kev thov kev pabcuam ua raws li kev faib tawm Poisson thiab lub sijhawm tuav kev pabcuam ua raws li kev faib tawm exponential tsis zoo. Tag nrho cov tsheb khiav tau teeb tsa rau 3100 Erlangs. Lub hom phiaj OXC qhov ntev yog 64 × 64, thiab cov txheej txheem nkag thiab tso zis MEMS kuj yog 64 × 64. Cov txheej txheem nruab nrab Spanke-OXC module teeb tsa suav nrog 32 × 32 lossis 48 × 48 cov lus qhia. Tus lej ntawm T-ports yog txij li 0 txog 16 nyob ntawm qhov xav tau ntawm qhov xwm txheej.
Cov txiaj ntsig qhia tau tias, hauv qhov xwm txheej nrog qhov ntev ntawm D = 4, qhov muaj feem cuam tshuam ntawm HMWC-OXC yog ze rau qhov ntawm Spanke-OXC ib txwm muaj (S (64,4)). Piv txwv li, siv v (64,2,32,0,4) kev teeb tsa, qhov muaj feem cuam tshuam ntawm kev thaiv tsuas yog nce kwv yees li 5% nyob rau hauv qhov nruab nrab load. Thaum qhov ntev ntawm kev taw qhia nce mus rau D = 8, qhov muaj feem cuam tshuam ntawm kev thaiv nce vim yog "qhov cuam tshuam ntawm lub cev" thiab qhov txo qis ntawm qhov ntev ntawm fiber hauv txhua qhov kev taw qhia. Txawm li cas los xij, qhov teeb meem no tuaj yeem daws tau zoo los ntawm kev nce tus lej ntawm T-ports (piv txwv li, v (64,2,48,16,8) kev teeb tsa).
Txawm hais tias qhov ntxiv ntawm cov modules nruab nrab tuaj yeem ua rau muaj kev thaiv sab hauv vim yog T-port sib cav, tag nrho cov qauv tseem tuaj yeem ua tiav qhov kev ua tau zoo tshaj plaws los ntawm kev teeb tsa tsim nyog.
Kev tshuaj xyuas tus nqi ntxiv qhia txog qhov zoo ntawm HMWC-OXC, raws li pom hauv daim duab hauv qab no.
Daim Duab: Kev Thaiv Qhov Feem Puas thiab Tus Nqi ntawm Cov Qauv OXC Sib Txawv
Hauv cov xwm txheej ceev ceev nrog 80 wavelengths / fiber, HMWC-OXC (v (64,2,44,12,64)) tuaj yeem txo cov nqi los ntawm 40% piv rau Spanke-OXC ib txwm muaj. Hauv cov xwm txheej wavelength qis (piv txwv li, 50 wavelengths / fiber), qhov zoo dua ntawm tus nqi tseem ceeb dua vim tias tus lej txo qis ntawm cov chaw nres nkoj T-qhov xav tau (piv txwv li, v (64,2,36,4,64)).
Qhov txiaj ntsig kev lag luam no yog los ntawm kev sib xyaw ua ke ntawm qhov chaw nres nkoj siab ntawm MEMS switches thiab lub tswv yim nthuav dav modular, uas tsis yog tsuas yog zam kev siv nyiaj ntawm kev hloov WSS loj xwb tab sis kuj txo cov nqi ntxiv los ntawm kev siv cov modules Spanke-OXC uas twb muaj lawm. Cov txiaj ntsig simulation kuj qhia tau tias los ntawm kev kho tus lej ntawm cov modules nruab nrab thiab qhov sib piv ntawm T-ports, HMWC-OXC tuaj yeem hloov pauv kev ua tau zoo thiab tus nqi raws li qhov muaj peev xwm wavelength sib txawv thiab kev teeb tsa kev taw qhia, muab cov neeg teb xov tooj nrog ntau lub sijhawm ua kom zoo dua.
Kev tshawb fawb yav tom ntej tuaj yeem tshawb nrhiav ntxiv txog cov txheej txheem faib T-port dynamic kom zoo dua qub rau kev siv cov peev txheej sab hauv. Ntxiv mus, nrog kev nce qib hauv cov txheej txheem tsim khoom MEMS, kev koom ua ke ntawm cov hloov pauv siab dua yuav ua rau muaj kev nthuav dav ntawm cov qauv no. Rau cov neeg teb xov tooj optical network, cov qauv no yog qhov tsim nyog rau cov xwm txheej uas tsis paub meej tias kev loj hlob ntawm tsheb khiav, muab cov kev daws teeb meem rau kev tsim kom muaj lub network backbone uas muaj zog thiab scalable.
Lub sijhawm tshaj tawm: Lub Yim Hli-21-2025