Tare da haɓaka tsarin sadarwa na gani tare da nisa mai tsayi, ƙarfin da ya fi girma da sauri mafi girma, musamman lokacin da adadin raƙuman ruwa ɗaya ya samo asali daga 40g zuwa 100g ko ma super 100g, watsawar chromatic, tasirin da ba a taɓa gani ba, watsawar yanayin polarization da sauran tasirin watsawa a cikin fiber na gani. yana tasiri sosai ga ƙarin haɓakar ƙimar watsawa da nisan watsawa.Sabili da haka, masana masana'antu suna ci gaba da bincike da haɓaka nau'ikan lambar FEC tare da mafi kyawun aiki don samun riba mai girma na net codeing (NCG) da ingantaccen aikin gyara kuskure, don saduwa da buƙatun saurin haɓaka tsarin sadarwa na gani.
1. Ma'ana da ka'idar FEC
FEC (gyaran kuskuren gaba) hanya ce don ƙara amincin sadarwar bayanai.Lokacin da siginar gani ya rikice yayin watsawa, ƙarshen karɓa na iya yin kuskuren siginar “1″ azaman siginar “0″, ko ɓata siginar “0” azaman siginar “1”.Sabili da haka, aikin FEC yana samar da lambar bayanin a cikin lambar tare da wasu iyawar gyara kuskure akan mai rikodin tashoshi a ƙarshen aikawa, kuma mai rikodin tashar a ƙarshen karɓa yana yanke lambar da aka karɓa.Idan adadin kurakurai da aka haifar a cikin watsawa yana cikin kewayon damar gyara kuskure (kurakurai masu ƙarewa), mai ƙididdigewa zai gano wuri kuma ya gyara kurakurai don haɓaka ingancin siginar.
2, Biyu iri samu sigina sarrafa hanyoyin da FEC
FEC za a iya raba kashi biyu: yanke shawara mai wuya da yanke yanke shawara mai laushi.Ƙididdigar yanke shawara mai wuya hanya ce ta yanke hukunci bisa ra'ayin gargajiya na lambar gyara kuskure.Dimodulator yana aika sakamakon yanke shawara zuwa ga mai ƙididdigewa, kuma mai ƙaddamarwa yana amfani da tsarin algebraic na codeword don gyara kuskure bisa ga sakamakon yanke shawara.Ƙididdigar yanke shawara mai laushi ya ƙunshi ƙarin bayanan tashoshi fiye da yanke yanke shawara mai wuya.Mai ƙididdigewa zai iya yin cikakken amfani da wannan bayanin ta hanyar yin gyare-gyaren yuwuwar, don samun riba mai girma fiye da yanke yanke hukunci.
3. Tarihin ci gaban FEC
FEC ta fuskanci tsararraki uku ta fuskar lokaci da aiki.Na farko ƙarni FEC rungumi dabi'ar wuya yanke shawara block code, da hankula wakilin ne RS (255239), wanda aka rubuta a cikin ITU-T G.709 da ITU-T g.975 matsayin, da codeword sama da 6.69%.Lokacin da fitarwa ber = 1e-13, ribar codeing ɗin sa yana kusan 6dB.FEC na ƙarni na biyu yana ɗaukar ƙaƙƙarfan yanke shawara mai ƙima, kuma gabaɗaya yana aiki da haɗin kai, interleaving, dikodi na juzu'i da sauran fasaha.Ƙididdiga sama da sama har yanzu 6.69%.Lokacin da fitarwa ber = 1e-15, ribar codeing ɗin sa ya fi 8dB, wanda zai iya tallafawa buƙatun watsa nisa na tsarin 10G da 40g.FEC na ƙarni na uku yana ɗaukar yanke shawara mai laushi, kuma lambar kalma ta wuce 15% - 20%.Lokacin da fitarwa ber = 1e-15, net codeing riba ya kai kusan 11db, wanda zai iya tallafawa buƙatun watsa nisa na 100g ko ma tsarin 100g mafi girma.
4. Aikace-aikacen FEC da 100g na gani na gani
Ana amfani da aikin FEC a cikin manyan kayan aikin gani masu sauri kamar 100g.Gabaɗaya, lokacin da aka kunna wannan aikin, nisan watsawa na babban ma'aunin gani mai sauri zai yi tsayi fiye da wancan lokacin da ba'a kunna aikin FEC ba.Misali, 100g na gani na gani na iya gabaɗaya cimma watsawa har zuwa 80km.Lokacin da aka kunna aikin FEC, nisan watsawa ta hanyar fiber na gani guda ɗaya na iya kaiwa zuwa 90km.Koyaya, saboda jinkirin da babu makawa na wasu fakitin bayanai a cikin aiwatar da gyaran kurakurai, ba duk manyan na'urori masu saurin gani ba ne aka ba da shawarar don kunna wannan aikin.
Maudu'in da ke sama shine game da '' Optical module FEC function '' wanda Shenzhen HDV Photoelectric Technology Co., Ltd ya kawo muku. The module kayayyakin samar da kamfanin cover na gani fiber modules, Ethernet modules, na gani fiber transceiver modules, na gani fiber damar kayayyaki, SSFP Optical modules, kumaSFP Optical fibers, da sauransu. Samfuran samfurin da ke sama na iya ba da tallafi don yanayin hanyar sadarwa daban-daban.Ƙwararrun ƙwararrun R & D mai ƙarfi na iya taimaka wa abokan ciniki tare da al'amurran fasaha, kuma ƙungiyar kasuwanci mai tunani da ƙwararrun za su iya taimaka wa abokan ciniki su sami ayyuka masu kyau a lokacin shawarwari da kuma bayan aikin samarwa.Barka da zuwa tuntube mu ga kowane irin tambaya.