Raws li peb paub, txij li xyoo 1990, WDM WDM thev naus laus zis tau siv rau kev sib txuas fiber-optic ntev ntawm ntau pua lossis txawm tias ntau txhiab mais. Rau feem ntau thaj chaw ntawm lub tebchaws, cov khoom siv fiber yog nws cov khoom kim tshaj plaws, thaum tus nqi ntawm cov khoom transceiver yog qis dua.
Txawm li cas los xij, nrog rau kev tawg ntawm cov ntaub ntawv hauv cov tes hauj lwm xws li 5G, WDM thev naus laus zis kuj tseem ceeb zuj zus hauv cov kev sib txuas luv luv, uas tau xa tawm hauv cov ntim loj dua thiab yog li ntawd muaj kev nkag siab ntau dua rau tus nqi thiab qhov loj ntawm cov khoom sib dhos transceiver.
Tam sim no, cov tes hauj lwm no tseem vam khom ntau txhiab tus fibers optical ib hom uas xa mus rau tib lub sijhawm los ntawm cov channel ntawm qhov chaw faib multiplexing, nrog rau cov nqi ntaub ntawv qis dua ntawm ob peb puas Gbit / s (800G) ib channel, nrog rau cov ntawv thov me me hauv T-class.
Txawm li cas los xij, yav tom ntej uas yuav los txog, lub tswv yim ntawm kev sib koom ua ke ntawm qhov chaw yuav sai sai no mus txog qhov txwv ntawm nws qhov kev nthuav dav, thiab yuav tsum tau ua kom tiav los ntawm kev sib koom ua ke ntawm cov ntaub ntawv hauv txhua lub fiber kom thiaj li txhawb nqa kev nce ntxiv ntawm cov nqi ntaub ntawv. Qhov no yuav qhib qhov chaw thov tshiab rau WDM thev naus laus zis, uas qhov kev nthuav dav siab tshaj plaws ntawm cov channel thiab cov nqi ntaub ntawv yog qhov tseem ceeb.
Hauv cov ntsiab lus no,lub tshuab hluav taws xob optical frequency comb (FCG)ua lub luag haujlwm tseem ceeb ua lub teeb me me, ruaj khov, ntau lub wavelength uas tuaj yeem muab ntau tus neeg nqa khoom zoo. Tsis tas li ntawd, qhov zoo tshwj xeeb ntawm cov teeb pom kev zoo zaus combs yog tias cov kab comb yog intrinsically equidistant hauv zaus, yog li so qhov xav tau rau inter-channel guard bands thiab zam kev tswj zaus uas yuav tsum tau rau ib kab hauv ib txoj kev npaj siv cov array ntawm DFB lasers.
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias cov txiaj ntsig no tsis yog siv rau WDM transmitters xwb tab sis kuj siv rau lawv cov receivers, qhov twg discrete local oscillator (LO) arrays tuaj yeem hloov los ntawm ib lub comb generator. Kev siv LO comb generators ntxiv pab txhawb kev ua cov teeb liab digital rau WDM channels, yog li txo qhov nyuaj ntawm receiver thiab ua rau muaj kev ua suab nrov theem siab dua.
Ntxiv rau, kev siv cov teeb liab LO comb nrog theem-locking rau kev txais tos sib luag ua rau nws muaj peev xwm rov tsim dua lub sijhawm-domain waveform ntawm tag nrho WDM teeb liab, yog li them rau kev puas tsuaj los ntawm cov teeb liab tsis sib xws hauv cov fiber kis tau. Ntxiv rau cov txiaj ntsig ntawm kev xa xov tooj cua comb-based, qhov loj me me dua thiab kev tsim khoom loj uas tsim nyog kuj tseem ceeb rau WDM transceivers yav tom ntej.
Yog li ntawd, ntawm ntau yam kev tsim cov teeb liab comb, cov khoom siv chip-scale yog qhov txaus siab 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 tuav tus yuam sij rau cov khoom siv WDM transceivers me me, ua haujlwm tau zoo uas tuaj yeem tsim tau ntau ntawm tus nqi qis, nrog rau kev xa mus txog kaum tawm Tbit / s ib lub fiber.
Daim duab hauv qab no qhia txog daim duab qhia txog lub tshuab xa xov WDM siv lub teeb pom kev zoo FCG ua lub teeb ci ntau lub nthwv dej. Lub teeb liab FCG raug cais ua ntej hauv lub demultiplexer (DEMUX) thiab tom qab ntawd nkag mus rau hauv EOM electro-optical modulator. Los ntawm, lub teeb liab raug rau QAM quadrature amplitude modulation kom zoo tshaj plaws spectral efficiency (SE).
Ntawm qhov chaw xa tawm, cov channel tau rov ua ke hauv lub multiplexer (MUX) thiab cov teeb liab WDM tau xa mus rau ntawm ib hom fiber. Ntawm qhov kawg tau txais, lub wavelength division multiplexing receiver (WDM Rx), siv LO local oscillator ntawm 2nd FCG rau kev tshawb pom multiwavelength coherent. Cov channel ntawm cov teeb liab WDM input tau sib cais los ntawm demultiplexer thiab pub rau lub coherent receiver array (Coh. Rx). qhov twg qhov zaus demultiplexing ntawm lub zos oscillator LO yog siv ua qhov siv theem rau txhua lub coherent receiver. Kev ua tau zoo ntawm cov kev sib txuas WDM no pom tseeb nyob ntawm qhov loj ntawm lub comb teeb liab generator, tshwj xeeb tshaj yog qhov dav ntawm kab optical thiab lub zog optical ib kab comb.
Tau kawg, cov thev naus laus zis siv zaus optical comb tseem nyob rau theem kev loj hlob, 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 kev siv tshuab, txo cov nqi thiab txhim kho kev ntseeg tau, ces nws yuav ua tau kom ua tiav cov ntawv thov theem hauv kev sib kis optical.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-21-2024