CWDM4-OCP Optical Module Specifications
Dec 18, 2025| Dab tsi yog cov specifications ntawm lubCWDM4-0CP optical module? Facebook's OCP project tau txhais cov qauv qhia tshwj xeeb.
Lub 100G CWDM4 module siv nyob rau hauv OCP (Open Compute Project) muaj cov lus qhia hauv qab no, uas yog raws li MSA- tau txhais CWDM4 module specifications.
| Parameter | Standard CWDM4 | CWDM4-OCP | Sau ntawv |
|---|---|---|---|
| Tus nqi | 4 × 25 Gb / s | 4 × 25 Gb / s | Tsis hloov |
| Pob | QSFP28 | QSFP28 | Tsis hloov |
| Kis qhov deb | 2km ua | 500 m | Txo |
| Tx OMA Transmit Optical Power | -4 dBm | -5 dBm | Kev xa hluav taws xob txo los ntawm 1 dB |
| Rx rhiab heev | -10 dBm | -9.5 dBm | Txais rhiab heev txo los ntawm 0.5 dB |
| Channel Poob | 5dB ib | 3.5dB ua | Tag nrho qhov poob qis los ntawm 1.5 dB |
| Kev khiav hauj lwm kub (Module External Temperature) | 0 ~ 70 degree | 15-55 ° C | So kom txaus |
Feem ntau, cov ntsiab lus hauv qab no tau so kom txaus:
(1) Kev khiav hauj lwm kub ntau tau nthuav dav, los ntawm thawj qib kev lag luam kub mus rau 15 ~ 55 degree.
(2) Qhov kev sib kis tau raug txo los ntawm 2km mus rau 500m, uas txuag tau 1.5 dB hauv fiber ntau optic channel fais fab nyiaj siv nyiaj (keeb kwm yog 5dB pob nyiaj siv). Qhov no 1.5 dB tso cai rau kev xav tau ntau dua rau kev kho qhov muag module qhov kis tau tus mob thiab txais tos specifications.
Facebook faib nws raws li hauv qab no: lub zog tso zis ntawm lub transmitter yog so los ntawm 1 dB; Lub receiver rhiab heev yog so los ntawm 0.5 dB. Lwm qhov kev qhia tshwj xeeb kho qhov muag tseem nyob nrog CWDM4, tseem siv QSFP28 pob thiab tseem muaj plaub txoj kab, txhua tus nrog cov ntaub ntawv tus nqi ntawm 25 Gb / s.
Facebook xaiv hom optical module rau ntau yam:
(1) Feem ntau ntawm fiber ntau optic cabling nrug nyob rau hauv cov ntaub ntawv chaw yog tsawg tshaj li 500 meters.
(2) Yav dhau los, ntawm cov ntaub ntawv qis dua, ob qho tib si multimode thiab ib zaug - hom fibers tau siv, yuav tsum tau muab cais tawm. Txawm li cas los xij, raws li optical module speeds nce, qhov sib kis ntawm multimode fiber ntau txo. Yog li ntawd, kev txhawb nqa tag nrho ib leeg - hom fiber ntau cabling yog yooj yim dua rau yav tom ntej nyob deb thiab ceev nthuav dav, thiab tsis txhob muaj teeb meem ntawm kev tswj ob qho tib si - hom thiab multimode fibers nyias nyias.
(3) Yav dhau los 500m kis tau tus mob siv cov fibers thaum uas tig mus, tab sis tam sim no nrog CWDM4 modules, tsuas yog 1/4 ntawm fiber ntau suav. Qhov no yog ib qho kev txhim kho tseem ceeb! Optical module technology tam sim no tau nce siab txaus los txhawb kev sib faib hauv wavelength multiplexing, thiab tus nqi kuj tau txo mus rau qib pheej yig.
100G luv- wavelength (850 ~ 940nm) wavelength division multiplexing multi- qhov chaw raws tu qauv
Kev xa tawm thiab tau txais kev kho qhov muag qhov tshwj xeeb:
| Main Parameter | Kev xav tau | Chav tsev | Sau ntawv |
|---|---|---|---|
| Nruab Nrab Fais Fab | -7.5 ~ 2 dBm | dBm ib | |
| Nruab Nrab Fais Fab | -5.5 ~ 3 dBm | dBm ib | |
| Extinction Ratio | 2 dB ib | dB | |
| Txais Lub Zog (Nruab nrab) | -9.5 dBm | dBm ib | |
| Tau txais rhiab heev (OMA, Txoj Kev Nruab Nrab) | TBD | Yuav txiav txim siab |
Link metrics:
| Main Parameter | OM 3 | OM 4 | OM 5 | Chav tsev | Sau ntawv |
|---|---|---|---|---|---|
| Kis qhov deb | 75 | 100 | 150 | m | |
| Insertion Loss | 1.8 | 1.9 | 2.9 | dB | |
| Siv tau Modal Bandwidth @ 850nm | Saib cov ntawv hauv qab no | Saib cov ntawv hauv qab no | Saib cov ntawv hauv qab no | MHz · km | Saib hauv qab no |
| Tus nqi Channel | L0: 1.8 L1: 1.8 L2: 1.8 L3: 1.7 | L0: 1.9 L1: 1.9 L2: 1.8 L3: 1.8 | L0: 2.0 L1: 1.9 L2: 1.9 L3: 1.9 | dB | Tej zaum qhov sib txawv channel tso nyiaj poob nyiaj (L0 txog L3 tuaj yeem sawv cev sib txawv los yog wavelengths) |
Dab tsi yog qhov ua tau zoo modal bandwidth?
Nyob rau hauv cov qauv multimode fiber ntau thaum ntxov, LEDs tau suav tias yog lub teeb ci. LEDs muaj qhov sib txawv loj dua li cov tub ntxhais fiber ntau, ua rau qhov chaw loj heev, yog li lo lus "tag nrho txhaj tshuaj bandwidth."
Tom qab ntawd, nws tau pom tias siv VCSELs raws li cov teeb pom kev zoo tau yooj yim dua thiab tsis tshua kim. VCSELs muaj qhov sib txawv me me dua li LEDs, me dua li cov tub ntxhais fiber ntau, yog li lub tswv yim ntawm kev txhaj tshuaj tag nrho bandwidth tsis siv tau lawm. Yog li ntawd, lub tswv yim ntawm kev ua tau zoo modal bandwidth tau qhia, uas yog cov khoom lag luam ntawm bandwidth thiab nrug.
Tsawg teeb liab bandwidth tso cai rau kev sib kis ntev dua.
High teeb liab bandwidth ua rau luv luv kis nrug deb.
Piv txwv li, nrog 25 Gb / s 940 nm teeb liab, yog tias lub cuab yeej muaj bandwidth ntawm 16 GHz (qhov theoretical txwv rau 25 Gb / s NRZ yog 12.5 GHz), ces qhov zoo ntawm modal bandwidth ntawm OM5 yog 2,500 MHz ·km, tso cai rau kev sib kis ntawm (2,000 m / 2,500)
OM4 muaj qhov ua tau zoo modal bandwidth ntawm 1859 MHz ·km, uas tso cai rau kev sib kis ntau dua (1859/16000)=116 meters. Qhov MSA no qhia txog kev sib kis ntawm 100m rau OM4 thiab 150m rau OM5. Qhov kev ua tau zoo modal bandwidth yog qhov ntsuas qhov ua tau zoo hauv MSA.
| Wavelength (nm) | Siv tau Modal Bandwidth (MHz · km) - OM3 | Siv tau Modal Bandwidth (MHz · km) - OM4 | Siv tau Modal Bandwidth (MHz · km) - OM5 | Chav tsev |
|---|---|---|---|---|
| 850 | 2000 | 4520 | 4190 | MHz · km |
| 880 | 1667 | 3076 | 3700 | MHz · km |
| 910 | 1426 | 2329 | 2880 | MHz · km |
| 940 | 1243 | 1859 | 2600 | MHz · km |