Usati wanzwisisa PAM4 tekinoroji, chii chinonzi modulation tekinoroji? Modulation tekinoroji ndiyo nzira yekushandura baseband masaini (mbishi magetsi masaini) kuita masaini ekufambisa. Kuti uve nechokwadi chekubudirira kwekutaurirana uye kukunda matambudziko mukufambiswa kwemasaini kureba, zvinodikanwa kuendesa chiratidzo chechiratidzo kune yakakwira-frequency chiteshi kuburikidza nemodulation yekutapurirana.
PAM4 ndeyechina yekuraira pulse amplitude modulation (PAM) modulation maitiro.
PAM chiratidzo inyanzvi yekufambisa tekinoroji mushure meNRZ (Isingadzoke kuZero).
Chiratidzo cheNRZ chinoshandisa mazinga maviri echiratidzo, akakwira uye akaderera, kumiririra 1 uye 0 yedhijitari logic chiratidzo, uye inogona kufambisa 1 bit yeruzivo rwepfungwa pawachi kutenderera.
PAM4 siginecha inoshandisa 4 akasiyana masignal mazinga ekufambisa kwemasaini, uye wachi yega yega inogona kuendesa 2 bits yeruzivo rwepfungwa, dzinoti 00, 01, 10, uye 11.
Nokudaro, pasi pemamiriro akafanana e-baud rate, chiyero chiduku chePAM4 chiratidzo chakapetwa kaviri chechiratidzo cheNRZ, icho chinowedzera kaviri kukwanisa kwekufambisa uye kuderedza zvakanyanya mari.
PAM4 tekinoroji yakashandiswa zvakanyanya mumunda we-high-speed signal interconnection. Parizvino, kune 400G optical transceiver module inobva paPAM4 modulation teknolojia ye data center uye 50G optical transceiver module yakabva PAM4 modulation teknolojia ye 5G interconnection network.
Nzira yekushandiswa kwe400G DML optical transceiver module inobva paPAM4 modulation ndeyotevera: paunenge uchitumira zviratidzo zveyuniti, yakagamuchirwa 16 migero ye25G NRZ magetsi emagetsi anowanikwa kubva kumagetsi emagetsi emagetsi, anofanorongwa neDSP processor, PAM4 modulated, uye kubuda 8 chiteshi che 25G PAM4 masaini emagetsi, ayo anotakurwa pane mutyairi chip. Zviratidzo zvemagetsi zvepamusoro-soro zvinoshandurwa kuva 8 nzira dze50Gbps dzepamusoro-speed optical signals kuburikidza ne8 migero ye lasers, yakabatanidzwa ne-wavelength division multiplexer, uye yakagadzirwa mu 1 channel ye400G yakakwirira-speed optical signal output. Paunenge uchigamuchira zviratidzo zveyuniti, iyo yakagamuchirwa 1-channel 400G high-speed optical signal inopinza kuburikidza ne-optical interface unit, inoshandurwa kuva 8-channel 50Gbps high-speed optical signal kuburikidza ne demultiplexer, inogamuchirwa neanogamuchira, uye inoshandurwa kuva magetsi. chiratidzo. Mushure mekudzoreredza wachi, kukwidziridzwa, kuenzana, uye PAM4 demodulation neDSP processing chip, chiratidzo chemagetsi chinoshandurwa kuita 16 chiteshi che 25G NRZ chiratidzo chemagetsi.
Isa PAM4 modulation tekinoroji ku400Gb/s optical modules. Iyo 400Gb / s optical module inobva paPAM4 modulation inogona kuderedza nhamba yemalasi anodiwa pamagumo ekutumira uye nenzira imwecheteyo kuderedza nhamba yevanodiwa vanogamuchira pakuguma kwekugamuchira nekuda kwekushandiswa kwepamusoro-soro nzira dzekugadzirisa zvichienzaniswa neNRZ. PAM4 modulation inoderedza nhamba ye optical components mu optical module, iyo inogona kuunza zvikomborero zvakadai semari shoma yegungano, kuderedzwa kwesimba rekushandisa, uye hukuru hwekutakura.
Pane kudiwa kwe50Gbit / s optical modules mu 5G transmission uye backhaul network, uye mhinduro inobva pa 25G optical devices uye inowedzerwa nePAM4 pulse amplitude modulation format inogamuchirwa kuti iwane yakaderera uye yakakwirira bandwidth zvinodiwa.
Paunenge uchitsanangura PAM-4 masaini, zvakakosha kuti utarise mutsauko pakati pebaud rate uye bit rate. Kune masaini echinyakare eNRZ, sezvo chiratidzo chimwe chichiendesa chidimbu chimwe chedata, chiyero chebhiti uye chiyero chebaud zvakafanana. Semuenzaniso, mu 100G Ethernet, uchishandisa ina 25.78125GBaud zviratidzo zvekutumira, chiyero chiduku pane imwe neimwe chiratidzo zvakare 25.78125Gbps, uye zviratidzo zvina zvinowana 100Gbps chiratidzo chekutumira; Pamasaini ePAM-4, sezvo chiratidzo chimwe chichiendesa 2 bits yedata, chiyero chidiki chinogona kufambiswa chakapetwa kaviri chiyero chebaud. Semuenzaniso, kushandisa 4 chiteshi che 26.5625GBaud zviratidzo zvekutumira mu 200G Ethernet, chiyero chiduku pane imwe neimwe chiteshi ndeye 53.125Gbps, uye 4 migero yezviratidzo inogona kuwana 200Gbps kutumira kwechiratidzo. Kune 400G Ethernet, inogona kuwanikwa ne8 chiteshi che 26.5625GBaud zviratidzo.
Nguva yekutumira: Jan-02-2025