DMT yog dab tsi?
Dec 01, 2025|
Lub optical module dawb ntawv hais txog ib hom DMT:
5G nruab nrab -kis tau tus mob optical modulehom
| Kab Ruam | Hom Module | Nyob deb | Lub wavelength | Modulation Format | Optical Chip / Ntes |
|---|---|---|---|---|---|
| 25 Gb/s | SFP28 | 40km ua | 1310nm ua | NRZ | EML + APD |
| QSFP28 SFP56 | 10km ua | 1310nm ua | PAM 4 | DFB + PIN / EML + PIN | |
| 50 Gb/s | QSFP28 BiDi | 10km ua | 1270/1330 nm | PAM 4 | DFB + PIN / EML + PIN |
| QSFP28 SFP56 | 40km ua | 1310nm ua | PAM 4 | EML + APD | |
| QSFP28 BiDi | 40km ua | 1295.56 nm / 1309.14 nm | PAM 4 | EML + APD | |
| 100 Gb/s | QSFP28 | 10km ua | CWDM / LWDM | NRZ | DFB + PIN / EML + PIN |
| QSFP28 | 40km ua | LWDM | NRZ | EML + APD | |
| QSFP28 | 10 / 20 km ib | DWDM | PAM 4, DMT | EML + PIN | |
| 100/200/400G | CFP2 – DCO | 80 ~ 1200 km | DWDM | PM QPSK, 8/16 QAM | IC – TROSA – ITLA |
| 200/400G | QSFP-DD / OSFP | 2 / 10 km ib | LWDM | PAM 4 | EML + PIN |
Peb paub txog cov qauv kev hloov pauv yooj yim xws li NRZ thiab PAM4. Lub tswvyim ntawm DMT yog dab tsi?
DMT, discrete multitone.
Tone, hauv essence, yog zaus. Thaum kuv tus ntxhais ua si lub guzheng, kuv qhib nws rau nws los ntawm kev tshuaj xyuas seb qhov zaus ntawm txhua txoj hlua resonates nrog cov kab noj hniav thaum plucked phim tus qauv zaus. Lub pitch meter yog qhov tseem ceeb ntawm lub ntsuas ntsuas zaus.
Multi-tone yog hais txog kev hloov pauv thoob plaws ntau zaus bands, txhais tau tias ntau lub subcarriers. Feem ntau, nws xav tias txhua tus subcarrier siv tib hom kev hloov pauv.
Discrete multi-tone txhais tau hais tias txhua tus subcarrier tuaj yeem hloov kho ntawm nws tus kheej, tsis muaj kev ua raws li tib hom ntawv.
Vim li cas? Vim tias qhov attenuation ntau dua ntawm cov zaus ntau dua ntawm cov zaus qis dua, yog li xaiv cov qauv tsim nyog tsim ua rau cov teeb liab kis tau yooj yim dua.
Peb NRZ kev hloov kho yog zoo li ib txoj hlua ua si kom nrawm li sai tau.
Multi-tone modulation yog zoo li ib qho cuab yeej (lossis kho qhov muag fiber ntau) qhov twg txhua txoj hlua tuaj yeem xa cov teeb liab 1010 modulation. Tsis tas li ntawd, vim muaj qhov sib txawv ntawm qhov sib txawv, lub receiver lim cov teeb liab los ntawm kev lim dej nqaim, kom ntseeg tau tias qhov demodulation yog ywj siab ntawm ib leeg.
Yog li ntawd, multi-tone modulation tuaj yeem ua tiav qhov kev sib kis ntau dua nrog cov bandwidth tsawg heev.
Discrete multi-tone modulation (DMT) tuaj yeem sib txuas cov yam ntxwv ntawm cov suab sib txawv thiab xaiv cov qauv sib txawv ntawm ntau hom.