Ndi chitukuko cha njira zoyankhulirana zowoneka bwino zokhala ndi mtunda wautali, mphamvu zazikulu, komanso kuthamanga kwakukulu, makamaka pamene mafunde amodzi amachokera ku 40g mpaka 100g kapena ngakhale super 100g, chromatic dispersion, nonlinear zotsatira, polarization mode dispersion, ndi zotsatira zina zopatsirana mu kuwala. CHIKWANGWANI chidzakhudza kwambiri kupititsa patsogolo kwa kuchuluka kwa kufalikira komanso mtunda wotumizira. Choncho, akatswiri a zamalonda akupitiriza kufufuza ndi kupanga mitundu ya ma code a FEC ndi ntchito yabwino kuti apeze phindu lapamwamba la coding coding (NCG) ndi kukonza zolakwika zolakwika, kuti akwaniritse zofunikira za chitukuko chofulumira cha machitidwe olankhulana owoneka bwino.
1, Tanthauzo ndi mfundo ya FEC
FEC (kuwongolera zolakwika kutsogolo) ndi njira yowonjezera kudalirika kwa kulumikizana kwa data. Chizindikiro cha kuwala chikasokonezedwa panthawi yotumizira, mapeto olandira akhoza kusokoneza chizindikiro cha "1" ngati "0" chizindikiro, kapena kusokoneza chizindikiro cha "0" ngati "1" chizindikiro. Chifukwa chake, ntchito ya FEC imapanga kachidindo kachidziwitso kukhala kachidindo kokhala ndi vuto linalake lokonza zolakwika pa encoder ya tchanelo pamapeto otumiza, ndipo chowongolera chanjira pamapeto olandila chimatsitsa kachidindo kolandilidwa. Ngati kuchuluka kwa zolakwika zomwe zimapangidwa pakupatsirana zili mkati mwazowongolera zolakwika (zolakwika zosapitilira), wowongolera amapeza ndikuwongolera zolakwikazo kuti zitsimikizire mtundu wa chizindikiro.
2, Mitundu iwiri ya njira zolandirira ma sigino a FEC
FEC ikhoza kugawidwa m'magulu awiri: kuyika zisankho zolimba komanso kuwongolera zisankho zofewa. Kuyika zisankho zolimba ndi njira yosinthira kutengera momwe amaonera zolakwika. Wowonetsera amatumiza zotsatira zachigamulo ku decoder, ndipo decoder amagwiritsa ntchito algebraic ya codeword kukonza zolakwika molingana ndi zotsatira za chisankho. Kusankha zisankho zofewa kumakhala ndi zambiri zamakina kuposa kusindikiza zisankho zolimba. Decoder imatha kugwiritsa ntchito zambiri izi kudzera pakulemba mwayi kuti apeze phindu lalikulu la zolemba kuposa kupanga zisankho molimba.
3, Mbiri Yakale ya FEC
FEC yakumana ndi mibadwo itatu potengera nthawi ndi magwiridwe antchito. M'badwo woyamba wa FEC umatenga code block block. Woyimilirayo ndi RS (255239), yomwe yalembedwa mu ITU-T G.709 ndi ITU-T g.975 miyezo, ndipo codeword pamwamba ndi 6.69%. Pamene zotulutsa ber=1e-13, phindu lake la coding limakhala pafupifupi 6dB. M'badwo wachiwiri wa FEC umatenga chigamulo cholimba chokhazikika, ndipo chimagwiritsidwa ntchito momveka bwino, kuphatikiza, kutulutsa, kubwerezabwereza, ndi matekinoloje ena. The codeword overhead akadali 6.69%. Pamene kutulutsa ber = 1e-15, phindu lake lachinsinsi ndiloposa 8dB, lomwe lingathe kuthandizira zofunikira zotumizira mtunda wautali wa machitidwe a 10G ndi 40G. Mbadwo wachitatu wa FEC umatenga chisankho chofewa, ndipo codeword pamwamba ndi 15% -20%. Pamene zotulutsa ber=1e-15, phindu la ma coding limafika pafupifupi 11db, lomwe limatha kuthandizira kufalikira kwakutali kwa 100g kapena ngakhale super 100g system.
4, Kugwiritsa ntchito FEC ndi 100g Optical module
Ntchito ya FEC imagwiritsidwa ntchito m'ma module othamanga kwambiri monga 100g. Kawirikawiri, ntchitoyi ikatsegulidwa, mtunda wotumizira wa module optical high-speed udzakhala wautali kuposa pamene ntchito ya FEC siinatsegulidwe. Mwachitsanzo, ma module a 100g amatha kufalikira mpaka 80km. Pamene ntchito ya FEC yatsegulidwa, mtunda wotumizira kudzera mumtundu umodzi wa fiber fiber ukhoza kufika ku 90 km. Komabe, chifukwa cha kuchedwa kosalephereka kwa mapaketi ena a data pokonza zolakwika, si ma modules onse othamanga kwambiri omwe akulimbikitsidwa kuti athetse ntchitoyi.
Shenzhen HDV photoelectric Technology Co., Ltd.Zolumikizirana zopangidwa ndi kampani zimakwirira;
Magawo a module:Optical fiber modules, Ethernet modules, Optical fiber transceiver modules, optical fiber access modules, SSFP Optical modules,ndiSFP kuwala ulusi, ndi zina.
ONUgulu:EPON ONU, AC ONU, Optical fiber ONU, CATV ONU, GPON ONU, XPON PA, ndi zina.
OLTkalasi:Kusintha kwa mtengo wa OLT, Mtengo wa GPON OLT, EPON OLT, kulankhulanaOLT, ndi zina.
Zomwe zili pamwambazi zitha kuthandizira pazochitika zosiyanasiyana zapaintaneti. Gulu la akatswiri komanso lamphamvu la R&D litha kuthandiza makasitomala omwe ali ndi zovuta zaukadaulo, ndipo gulu loganiza bwino komanso laukadaulo litha kuthandiza makasitomala kupeza ntchito zapamwamba panthawi yokambirana zisanachitike komanso pambuyo popanga. Takulandirani kuLumikizanani nafepafunso lamtundu uliwonse.
