Ndi chitukuko cha njira yolumikizirana yowoneka bwino yokhala ndi mtunda wautali, mphamvu yayikulu komanso kuthamanga kwambiri, makamaka pamene mafunde amodzi amachokera ku 40g mpaka 100g kapena ngakhale super 100g, kubalalitsidwa kwa chromatic, zotsatira zosagwirizana, kufalikira kwamachitidwe a polarization ndi zotsatira zina zopatsira mu fiber fiber. Zingakhudze kwambiri kupititsa patsogolo kwa kuchuluka kwa kufalikira ndi mtunda wotumizira.Chifukwa chake, akatswiri amakampani akupitilizabe kufufuza ndikupanga mitundu yamtundu wa FEC yokhala ndi magwiridwe antchito abwinoko kuti apeze phindu lapamwamba la ma net coding (NCG) komanso kukonza zolakwika bwino, kuti akwaniritse zosowa zakukula mwachangu kwa makina olumikizirana 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.Kulemba 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 zotheka, 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 umagwiritsa ntchito code block block, woyimilira 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 chokhazikika 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 90km.Komabe, chifukwa cha kuchedwa kosalephereka kwa mapaketi ena a data pokonza zolakwika, si ma modules onse othamanga kwambiri omwe akulimbikitsidwa kuti athetse ntchitoyi.
Mutu womwe uli pamwambawu ndi wa '' Optical module FEC function'' yobweretsedwa kwa inu ndi Shenzhen HDV photoelectric Technology Co., Ltd. Zinthu zomwe zimapangidwa ndi chivundikiro cha kampani Optical fiber modules, Ethernet modules, Optical fiber transceiver modules, optical fiber access modules, SSFP Optical modules,ndiSFP kuwala ulusi, etc. Zomwe zili pamwambazi zimatha kupereka chithandizo pazochitika zosiyanasiyana za intaneti.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 ku Lumikizanani nafe pafunso lamtundu uliwonse.