Aʻo leʻi malamalama i tekinolosi PAM4, o le a le tekinolosi faʻaogaina? Fa'atekonolosi fa'aogaina o le auala lea e fa'aliliu ai fa'ailo fa'amau (fa'ailoga eletise mata) i fa'ailoga fa'asalalau. Ina ia faʻamautinoa le lelei o fesoʻotaʻiga ma faʻatoʻilaloina faʻafitauli i le faʻasalalauga mamao mamao, e manaʻomia le tuʻuina atu o le fusi o alaleo i se auala maualuga e ala i le faʻaogaina mo le faʻasalalauga.
O le PAM4 o le fa'atonuga lona fa o le pulse amplitude modulation (PAM).
Fa'ailoga PAM ose fa'atekonolosi fa'asalalau fa'ailoga lauiloa pe a mae'a le NRZ (No Return to Zero).
O le faailo o le NRZ e faʻaogaina ai le lua faʻailoga, maualuga ma lalo, e fai ma sui o le 1 ma le 0 o le faʻailoga numera numera, ma e mafai ona tuʻuina atu le 1 bit faʻamatalaga faʻamatalaga i le taamilosaga o le uati.
O le faailo PAM4 e fa'aogaina ai le 4 tulaga eseese o fa'ailoga mo le fa'asalalauina o fa'ailo, ma ta'amilosaga uati ta'itasi e mafai ona tu'uina atu 2 fasi fa'amatalaga fa'atatau, e ta'ua o le 00, 01, 10, ma le 11.
O le mea lea, i lalo o tulaga tutusa baud rate, o le paʻu o le PAM4 faʻailoga e faaluaina i le faailo NRZ, lea e faʻaluaina ai le lelei o le felauaiga ma faʻaititia lelei tau.
O tekonolosi PAM4 ua faʻaaogaina lautele i le fanua o fesoʻotaʻiga faʻailoga maualuga. I le taimi nei, o loʻo i ai le 400G optical transceiver module e faʻavae i luga o le PAM4 modulation technology mo le nofoaga autu o faʻamatalaga ma le 50G optical transceiver module e faʻavae i luga o le PAM4 modulation technology mo le 5G interconnection network.
O le faʻatinoga o le faʻaogaina o le 400G DML optical transceiver module e faʻavae i luga o le PAM4 modulation e faʻapea: pe a tuʻuina atu faʻailoga iunite, o le 16 alalaupapa o le 25G NRZ eletise eletise o loʻo faʻaogaina mai le eletise eletise eletise, na muaʻi faia e le DSP processor, PAM4 modulated, ma 8 alalaupapa o le 25G PAM4 faailo eletise, o loʻo faʻapipiʻiina i luga o le masini avetaʻavale. O faailo eletise eletise maualuga ua liua i le 8 alalaupapa o le 50Gbps maualuga-saoasaoa opitika faailoilo e ala i le 8 alalaupapa o lasers, tuufaatasia e se galu umi vaevaega multiplexer, ma synthesized i le 1 alalaupapa o le 400G maualuga-saosaoa faʻailoga faʻailoga mataʻutia. Pe a mauaina faʻailoga o le iunite, o le 1-channel 400G high-speed optical signal e tuʻuina atu e ala i le iunite faʻafesoʻotaʻi, liua i le 8-channel 50Gbps faʻailoga maualuga televave e ala i se demultiplexer, mauaina e se tali faʻapipiʻi, ma liua i se eletise eletise. faailoilo. A maeʻa le toe faʻaleleia o le uati, faʻateleina, faʻatusa, ma le PAM4 demodulation e ala i le DSP process chip, o le eletise eletise ua liua i 16 laina ole 25G NRZ eletise eletise.
Fa'aoga le tekonolosi fa'aogaina PAM4 i le 400Gb/s mata'itusi mata'utia. O le 400Gb / s optical module e faʻavae i luga o le PAM4 modulation e mafai ona faʻaitiitia le numera o lasers manaʻomia i le pito faʻasalalau ma faʻaititia tutusa le numera o tagata e manaʻomia i le pito e maua ona o le faʻaogaina o metotia faʻatulagaina maualuga pe a faʻatusatusa i le NRZ. O le PAM4 modulation e faʻaitiitia ai le numera o mea faʻapipiʻi i totonu o le masini faʻapipiʻi, lea e mafai ona maua ai faʻamanuiaga e pei o le faʻaititia o tau faʻapotopotoga, faʻaitiitia le faʻaogaina o le eletise, ma le laʻititi o le afifiina.
O loʻo i ai se manaʻoga mo 50Gbit / s faʻapipiʻi faʻapipiʻi i le 5G transmission ma backhaul networks, ma o se fofo e faʻavae i luga o 25G masini faʻapipiʻi ma faʻaopoopoina e le PAM4 pulse amplitude modulation format ua faʻaaogaina e ausia ai le tau maualalo ma le maualuga o le bandwidth manaʻomia.
Pe a faʻamatalaina faʻailoga PAM-4, e taua le faʻalogo i le eseesega i le va o le paud rate ma le bit rate. Mo fa'ailoga masani a le NRZ, talu ai ona o le tasi fa'ailoga e tu'uina atu le tasi vaega o fa'amaumauga, o le bit rate ma le baud rate e tutusa. Mo se faʻataʻitaʻiga, i le 100G Ethernet, faʻaaogaina faʻailoga 25.78125GBaud mo le faʻasalalau, o le fua faʻatatau i luga o faʻailoga taʻitasi o le 25.78125Gbps foi, ma faʻailoga e fa e ausia ai le 100Gbps faʻasalalauga; Mo faailo PAM-4, talu ai o le tasi faʻailoga e tuʻuina atu 2 bits o faʻamaumauga, o le bit rate e mafai ona faʻasalalau e faaluaina le baud rate. Mo se faʻataʻitaʻiga, faʻaaogaina 4 alalaupapa o 26.5625GBaud faʻailoga mo le faʻasalalau i le 200G Ethernet, o le fua faʻatatau i luga o auala taʻitasi o le 53.125Gbps, ma 4 alalaupapa o faʻailoga e mafai ona ausia le 200Gbps faʻasalalauga. Mo 400G Ethernet, e mafai ona ausia i 8 alalaupapa o 26.5625GBaud faailo.
Taimi meli: Ian-02-2025