Tam sim no, hom bandwidth ntawm 850 nm multi-mode fiber ntau yog qhov siab tshaj plaws hauvOM4 fiber ntau, uas tuaj yeem txhawb nqa 100 meters sib kis ntawm 100 g system. Yog hais tias hom bandwidth yog ntxiv, qhov refractive index faib yuav tsum tau tswj kom zoo zoo dua, uas tso rau pem hauv ntej cov kev xav tau ntau dua ntawm cov txheej txheem ntau lawm thiab muaj kev cuam tshuam zoo rau kev tawm los ntawm cov khoom. Ntawm qhov tod tes, tag nrho bandwidth ntawm lub kaw lus raug txwv los ntawm fiber ntau hom bandwidth thiab fiber ntau dispersion. Vim tias muaj kev cuam tshuam ntawm kab dav ntawm VCSEL tam sim no, ntau hom fiber ntau dispersion dhau los ua qhov tseem ceeb tshaj plaws uas cuam tshuam rau kev ceev thiab kev sib txuas. Yog tias koj xav nce tus nqi sib kis lossis kev sib kis ntawm qhov system, feem ntau koj tuaj yeem siv ob txoj hauv kev: siv ib hom fiber ntau thiab ib hom laser. Los yog ntau hom fiber ntau tseem siv, tab sis ib txoj kab nqaim-dav laser yog siv los txwv qhov xwm txheej ntawm ntau hom fiber ntau. Qhov tsis zoo ntawm ob txoj hauv kev no yog tias cov lasers kim dua yuav tsum tau thiab cov txheej txheem fiber ntau txuas yuav tsum tau ua kom raug siab dua, uas yuav ua rau tus nqi siab dua thiab kev sib txuas ntawm cov khoom siv kho qhov muag. Yog li ntawd, multimode optical fiber technology yuav tsum tau txhim kho kom paub lub peev xwm ntau dua thiab ntev dua kev sib kis. Kev tshawb fawb ntawm cov tshiab multimode fiber ntau yog tsom rau cov lus qhia hauv qab no.
1. Ntev yoj multimode fiber ntau
Ntev-yoj optimized high-bandwidth multi-mode fiber ntau (980nm / 1060nm lossis 1310nm) ua ke nrog lub teeb pom kev zoo (xws li VCSEL) yog lub tswv yim ua tau kom paub txog qhov ntev thiab kev sib kis ceev. Qhov ntev nthwv dej multimode fiber ntau khaws cov txiaj ntsig zoo ntawm kev sib txuas qis thiab kev sib txuas yooj yim ntawm cov pa 850 nm multimode fiber ntau, thiab qhov cuam tshuam thiab txo qis ntawm cov fiber ntau yog qis dua. Ua hauj lwm nyob rau hauv ntev nthwv dej cheeb tsam ntawm tsawg poob, tsawg dispersion ntawm multimode optical fiber system tuaj yeem ua tiav tus nqi siab dua thiab kev sib kis ntev dua, nyob rau xyoo tas los no, cov txiaj ntsig ntawm kev sim kuj tseem ua pov thawj qhov xaus: kev sib xyaw ntawm 1310nm thiab 1310nm ntawm multimode fiber ntau silicon. optics module, paub qhov sib kis ntawm ntau tshaj 820nm, 1060nm multimode optical fiber nrog 1060nm VCSEL laser ua ke tau pom tau hais tias kis tau tus mob ntau tshaj 500m (kev sim saum toj no yog 100G tus nqi).
2. Broadband multimode fiber ntau
Raws li tus qauv ntawm40G/100Gformulated los ntawm ieee802.3ba, kis tus nqi ntawm 40G ntawm ntau hom fiber ntau yog 4 * 10Gbp =40Gbps rau txhua khub ntawm fiber, 4 * 10Gbp=40Gbps rau txhua khub ntawm fiber, 4 * 25Gbps =100G rau txhua khub ntawm fiber ntau, 4 * 25Gbps=100G rau txhua khub fiber ntau. Kev sib kis tus nqi ntawm 400G modules xav tau 16 khub ntawm 32 core fiber ntau, uas muaj ntau cov khoom siv fiber ntau. Kev lag luam tab tom tshawb nrhiav txoj hauv kev los siv ntau lub wavelength multiplexing kom txo tau cov fiber ntau siv.
Muaj ob hom multi wavelength multiplexing khoom ntawm lub khw. Ib qho yog BIDI (bi-direction) thev naus laus zis, raws li qhia hauv daim duab hauv qab no (siv 40G ua piv txwv). Lub optical module muaj ob txoj hauv kev ntawm 20Gbps, thiab txhua lub fiber ntau muaj peev xwm xa thiab tau txais (cov fiber ntau hom txhawb 850nm thiab 900nm wavelengths). Thaum kawg, 40G kis tau tus mob tau paub txog ntawm ob lub fibers, thiab tsis tas yuav tsum muaj qhov txuas ntxiv ntawm MPT connector. Nws yuav tsum raug sau tseg tias txij li txhua fiber ntau hauv BIDI transceiver ob qho tib si xa tawm thiab tau txais cov cim, qhov chaw nres nkoj ceg tsis tau txais kev txhawb nqa. Lwm cov txheej txheem yog luv wavelength division multiplexing (SWDM). Zoo ib yam li BIDI, SWDM tsuas yog xav tau ob-core LC duplex kev sib txuas, tab sis SWDM yuav tsum ua haujlwm ntawm plaub qhov sib txawv wavelengths ntawm 850nm thiab 940nm, nrog rau ib qho fiber ntau rau cov teeb liab kis tau tus mob thiab lwm yam rau kev txais lub teeb liab.
Pa OM3 / OM4 fiber ntau bandwidth feem ntau tsuas yog optimized rau 850nm. Txhawm rau txhawb kev ua haujlwm ntawm SWDM kho qhov muag module, kev ua haujlwm ntawm fiber ntau ntawm 940nm yuav tsum tau ua kom muaj nuj nqis. Yog li ntawd, lub koom haum ntawm kev lag luam kev sib txuas lus (TIA) tsim ib pab pawg neeg ua hauj lwm nyob rau hauv 2014 los tsim cov txheej txheem rau broadband multimode optical fiber (WB MMF) los txhawb SWDM kis tau tus mob. WB MMF tia-492aae tus qauv tau tshaj tawm thaum Lub Rau Hli 2016. Broadband multimode fiber ntau yog ib hom OM4 fiber ntau nrog kev ua haujlwm ntev, vim tias broadband multimode fiber ntau tseem yuav tsum tau ua raws li qhov yuav tsum tau muaj ntawm OM4 fiber ntau EMB ntau dua lossis sib npaug. mus rau 4700 MHz ntawm lub wavelength ntawm 850 nm. Qhov bandwidth ntawm km yuav tsum tau, thiab EMB ntawm 953 nm wavelength yuav tsum tau ua kom tau raws li qhov yuav tsum tau muaj ntau tshaj los yog sib npaug rau 2470MHz * Km nyob rau hauv Lub kaum hli ntuj 2016, lub thoob ntiaj teb cov qauv lub koom haum hu ua broadband multimode fiber OM5 fiber.
BODI thiab SWDM siv OM4 fiber ntau kis tau 150m thiab 350m raws li ntawm 40G, thiab 100G module OM5 tuaj yeem txhawb nqa kev sib kis ntawm BIDI thiab SWDM optical module 150m, qhov sib txawv, kev sib kis ntawm OM3 thiab OM4 yog 70m thiab 100m, tab sis qhov kev ncua deb no yog txaus rau feem ntau multi-mode scenario. OM4 tuaj yeem txhawb ntau qhov kev daws teeb meem kho qhov muag los ntawm 40G txog 400G (xws li 100G SR4, 100GBiDi, 400gsr4.2, 400GSR8, thiab lwm yam). Nyob rau hauv kev xyaum, yuav tsum tau ua ke nrog rau daim ntawv thov scenario xaiv haum multimode fiber ntau, piv txwv li, yuav tsum tau siv lub optical module SR4 / eSR4 chaw nres nkoj ceg, OM5 OM4 thiab zoo ib yam, yog li OM4 yog ntau npaum li cas cov kev daws teeb meem, thiab nyob rau hauv ntau. tshaj 100 g los yog tus nqi kis tau tus mob ntawm ntau tshaj 100 m ntawm qhov txuas, OM5 / SWDM ua ke tuaj yeem cuam tshuam qhov zoo ntawm kev thauj mus los ntev.
