Monga tikudziwira, kuyambira m'ma 1990, ukadaulo wa WDM WDM wakhala ukugwiritsidwa ntchito polumikiza ma fiber-optic akutali okhala ndi makilomita mazana kapena zikwi. M'madera ambiri mdziko muno, zomangamanga za fiber ndiye chuma chake chokwera mtengo kwambiri, pomwe mtengo wa zida zotumizira ma transceiver ndi wotsika.
Komabe, chifukwa cha kuchuluka kwa deta m'ma network monga 5G, ukadaulo wa WDM ukukhala wofunikira kwambiri m'maulumikizidwe afupiafupi, omwe amagwiritsidwa ntchito m'ma voliyumu akuluakulu ndipo motero amakhudzidwa kwambiri ndi mtengo ndi kukula kwa ma transceiver assemblies.
Pakadali pano, ma network awa amadalirabe zikwizikwi za ulusi wa single-mode optical womwe umatumizidwa limodzi kudzera mu njira zogawa malo, ndi kuchuluka kochepa kwa deta pafupifupi mazana angapo a Gbit/s (800G) pa njira iliyonse, ndi kuchuluka kochepa kwa ntchito zomwe zingatheke mu T-class.
Komabe, mtsogolomu, lingaliro la kufanana kwa malo posachedwa lidzafika malire a kukula kwake, ndipo lidzayenera kuwonjezeredwa ndi kufanana kwa ma spectral kwa mitsinje ya deta mu ulusi uliwonse kuti zipitirire kuwonjezeka kwa kuchuluka kwa deta. Izi zitha kutsegula malo atsopano ogwiritsira ntchito ukadaulo wa WDM, momwe kukula kwakukulu pankhani ya kuchuluka kwa njira ndi kuchuluka kwa deta ndikofunikira.
Pankhaniyi,jenereta ya optical frequency comb (FCG)imagwira ntchito yofunika kwambiri ngati gwero laling'ono, lokhazikika, lokhala ndi mafunde ambiri lomwe lingapereke zonyamulira zambiri zowunikira bwino. Kuphatikiza apo, ubwino wofunikira kwambiri wa ma frequency combs a kuwala ndikuti mizere ya combs imakhala yofanana kwambiri pamafupipafupi, motero imachepetsa kufunikira kwa ma band achitetezo pakati pa njira ndikupewa kuwongolera ma frequency komwe kungafunike pa mzere umodzi mu dongosolo lachikhalidwe pogwiritsa ntchito ma laser a DFB osiyanasiyana.
Ndikofunikira kudziwa kuti ubwino uwu sumagwira ntchito pa ma transmitter a WDM okha komanso kwa ma receiver awo, komwe ma discrete local oscillator (LO) arrays amatha kusinthidwa ndi jenereta imodzi ya chisa. Kugwiritsa ntchito ma jenereta a chisa cha LO kumathandizanso kukonza ma signal a digito pa njira za WDM, motero kuchepetsa zovuta za receiver ndikuwonjezera kulekerera kwa phokoso la gawo.
Kuphatikiza apo, kugwiritsa ntchito zizindikiro za LO comb ndi phase-locking kuti zigwirizane bwino kumathandizanso kukonzanso mawonekedwe a nthawi ya chizindikiro chonse cha WDM, motero kulipira zolakwika zomwe zimachitika chifukwa cha kusagwirizana kwa kuwala mu ulusi wotumizira. Kuphatikiza pa zabwino izi zamalingaliro a kutumiza chizindikiro pogwiritsa ntchito comb, kukula kochepa komanso kupanga zinthu zambiri zotsika mtengo ndizofunikira kwambiri pa ma transceivers amtsogolo a WDM.
Chifukwa chake, pakati pa malingaliro osiyanasiyana opanga chizindikiro cha comb, zida za chip-scale ndizofunikira kwambiri. Zikaphatikizidwa ndi ma circuits ophatikizika a photonic omwe amatha kukulitsidwa kwambiri kuti asinthe chizindikiro cha data, kuchulukitsa, kuyendetsa ndi kulandira, zida zotere zitha kukhala chinsinsi cha ma transceivers a WDM ang'onoang'ono komanso ogwira ntchito bwino omwe amatha kupangidwa mochuluka pamtengo wotsika, okhala ndi mphamvu zotumizira mpaka makumi a Tbit/s pa ulusi uliwonse.
Chithunzi chotsatirachi chikuwonetsa chithunzi cha chotumizira cha WDM pogwiritsa ntchito FCG ngati gwero la kuwala kwa mafunde ambiri. Chizindikiro cha FCG chimalekanitsidwa kaye mu demultiplexer (DEMUX) kenako chimalowa mu EOM electro-optical modulator. Kudzera mu izi, chizindikirocho chimayikidwa mu advanced QAM quadrature amplitude modulation kuti chikhale ndi mphamvu yabwino kwambiri ya spectral efficiency (SE).
Pa kutuluka kwa transmitter, njirazi zimaphatikizidwanso mu multiplexer (MUX) ndipo zizindikiro za WDM zimatumizidwa kudzera mu ulusi wa single mode. Pamapeto pake, wolandila wa wavelength division multiplexing (WDM Rx), amagwiritsa ntchito LO local oscillator ya 2nd FCG kuti azindikire coherent ya multiwavelength. Njira za zizindikiro za WDM zolowera zimalekanitsidwa ndi demultiplexer ndikuperekedwa ku coherent receiver array (Coh. Rx). komwe demultiplexing frequency ya local oscillator LO imagwiritsidwa ntchito ngati gawo la coherent receiver iliyonse. Kuchita bwino kwa maulalo a WDM otere kumadalira kwambiri pa jenereta ya chizindikiro cha coherent, makamaka m'lifupi mwa mzere wa optical ndi mphamvu ya optical pa mzere uliwonse wa coherent.
Zachidziwikire, ukadaulo wa optical frequency comb ukadali mu gawo lotukuka, ndipo zochitika zake zogwiritsidwa ntchito komanso kukula kwa msika ndizochepa. Ngati ingathe kuthana ndi zovuta zaukadaulo, kuchepetsa ndalama ndikuwonjezera kudalirika, ndiye kuti idzakhala yotheka kukwaniritsa ntchito zamlingo waukulu pakutumiza kwa optical.
Nthawi yotumizira: Novembala-21-2024