Peb paub tias txij li xyoo 1990, WDM wavelength division multiplexing thev naus laus zis tau siv rau kev sib txuas fiber optic ntev uas ntev txog ntau pua lossis txawm tias ntau txhiab kilometers. Rau feem ntau lub tebchaws thiab thaj chaw, cov khoom siv fiber optic yog lawv cov khoom kim tshaj plaws, thaum tus nqi ntawm cov khoom transceiver qis heev.
Txawm li cas los xij, nrog rau kev loj hlob sai ntawm cov ntaub ntawv sib kis hauv network xws li 5G, WDM thev naus laus zis tau dhau los ua qhov tseem ceeb hauv kev sib txuas luv luv, thiab qhov ntim ntawm kev xa tawm ntawm cov kev sib txuas luv luv yog qhov loj dua, ua rau tus nqi thiab qhov loj ntawm cov khoom transceiver muaj kev cuam tshuam ntau dua.
Tam sim no, cov tes hauj lwm no tseem vam khom ntau txhiab tus fibers optical ib hom rau kev sib kis sib luag los ntawm qhov chaw faib multiplexing channels, thiab tus nqi ntawm cov ntaub ntawv ntawm txhua channel yog qis heev, feem ntau tsuas yog ob peb puas Gbit / s (800G). T-level tej zaum yuav muaj kev siv tsawg.
Tab sis yav tom ntej uas yuav pom tau, lub tswv yim ntawm kev sib npaug ntawm qhov chaw yuav sai sai no mus txog nws qhov kev txwv scalability, thiab yuav tsum tau ntxiv los ntawm kev sib npaug ntawm cov ntaub ntawv hauv txhua lub fiber kom tswj tau kev txhim kho ntxiv hauv cov nqi ntaub ntawv. Qhov no yuav qhib qhov chaw thov tshiab rau kev siv tshuab wavelength division multiplexing, qhov twg qhov siab tshaj plaws ntawm tus lej channel thiab tus nqi ntaub ntawv yog qhov tseem ceeb.
Hauv qhov no, lub tshuab tsim zaus (FCG), ua lub teeb me me thiab ruaj khov ntau qhov ntev ntawm lub teeb, tuaj yeem muab ntau tus neeg nqa khoom zoo, yog li ua lub luag haujlwm tseem ceeb. Tsis tas li ntawd, qhov zoo tshwj xeeb ntawm lub zog zaus ntawm lub teeb yog tias cov kab sib txuas yog qhov sib npaug hauv zaus, uas tuaj yeem txo qhov yuav tsum tau ua rau cov kab sib txuas ntawm cov channel thiab zam kev tswj zaus uas xav tau rau cov kab ib leeg hauv cov phiaj xwm ib txwm siv DFB laser arrays.
Yuav tsum nco ntsoov tias cov txiaj ntsig no tsis yog siv rau lub transmitter ntawm wavelength division multiplexing xwb, tab sis kuj siv rau nws lub receiver, qhov twg discrete local oscillator (LO) array tuaj yeem hloov los ntawm ib lub comb generator. Kev siv LO comb generators tuaj yeem pab txhawb kev ua cov teeb liab digital hauv wavelength division multiplexing channels, yog li txo qhov nyuaj ntawm lub receiver thiab txhim kho kev ua kom nrov nrov.
Ntxiv rau, kev siv LO comb signals nrog theem-xauv function rau kev txais tos sib luag tuaj yeem tsim kho dua tshiab lub sijhawm-domain waveform ntawm tag nrho cov teeb liab wavelength division multiplexing, yog li them rau qhov kev puas tsuaj los ntawm qhov tsis sib xws ntawm cov fiber kis tau tus mob. Ntxiv rau qhov zoo ntawm lub tswv yim raws li kev xa xov comb signal, qhov me me thiab kev lag luam zoo hauv kev tsim khoom loj kuj yog cov yam tseem ceeb rau yav tom ntej wavelength division multiplexing transceivers.
Yog li ntawd, ntawm ntau yam kev tsim hluav taws xob comb signal generator lub tswv yim, cov khoom siv theem chip yog qhov tseem ceeb tshwj xeeb. Thaum ua ke nrog cov photonic integrated circuits uas muaj peev xwm loj heev rau kev hloov kho cov ntaub ntawv teeb liab, multiplexing, routing, thiab kev txais tos, cov khoom siv no yuav dhau los ua qhov tseem ceeb rau cov khoom siv compact thiab ua haujlwm tau zoo wavelength division multiplexing transceivers uas tuaj yeem tsim tau ntau ntawm tus nqi qis, nrog rau lub peev xwm kis tau ntawm kaum tawm Tbit / s ib fiber.
Ntawm qhov tso zis ntawm qhov kawg xa, txhua txoj kab ke raug rov ua ke los ntawm lub multiplexer (MUX), thiab lub teeb liab faib wavelength multiplexing raug xa mus los ntawm ib hom fiber. Ntawm qhov kawg tau txais, lub wavelength division multiplexing receiver (WDM Rx) siv LO local oscillator ntawm FCG thib ob rau ntau qhov kev cuam tshuam wavelength. Lub channel ntawm lub teeb liab faib wavelength multiplexing nkag yog sib cais los ntawm demultiplexer thiab tom qab ntawd xa mus rau ib qho coherent receiver array (Coh. Rx). Ntawm lawv, qhov zaus demultiplexing ntawm lub oscillator hauv zos LO yog siv ua qhov siv theem rau txhua lub coherent receiver. Kev ua tau zoo ntawm qhov txuas wavelength division multiplexing no pom tseeb tias nyob ntawm lub tshuab hluav taws xob comb yooj yim, tshwj xeeb tshaj yog qhov dav ntawm lub teeb thiab lub zog optical ntawm txhua kab comb.
Tau kawg, cov thev naus laus zis siv zaus optical comb tseem nyob rau theem kev txhim kho, thiab nws cov xwm txheej siv thiab qhov loj ntawm kev ua lag luam tseem me me. Yog tias nws tuaj yeem kov yeej cov teeb meem thev naus laus zis, txo cov nqi, thiab txhim kho kev ntseeg tau, nws yuav ua tiav cov ntawv thov theem hauv kev sib kis optical.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-19-2024