Ngokuthuthukiswa kwesistimu yokuxhumana ye-optical enebanga elide, umthamo omkhulu kanye nesivinini esiphezulu, ikakhulukazi lapho izinga elilodwa lamagagasi livela ku-40g kuya ku-100g noma ngisho ne-super 100g, ukuhlakazeka kwe-chromatic, umphumela ongewona oqondile, ukuhlakazeka kwemodi ye-polarization kanye neminye imiphumela yokudlulisela ku-fiber optical kube nomthelela omkhulu ekuthuthukisweni kwezinga lokudlulisela kanye nebanga lokudlulisela. Ngakho-ke, ochwepheshe bezimboni bayaqhubeka nokucwaninga nokuthuthukisa izinhlobo zekhodi ye-FEC ngokusebenza okungcono ukuze bathole inzuzo ephezulu ye-coding net (NCG) kanye nokusebenza okungcono kokulungiswa kwamaphutha, ukuze kuhlangatshezwane nezidingo zokuthuthukiswa okusheshayo kwezinhlelo zokuxhumana ezibonakalayo.
1, Incazelo kanye nomgomo we-FEC
I-FEC (ukulungiswa kwephutha phambili) kuyindlela yokwandisa ukwethembeka kokuxhumana kwedatha. Uma isignali yokubona iphazamiseka phakathi nokudlulisa, indawo eyamukelayo ingase ingahluleli kahle isiginali ethi “1″ njengesignali ye-“0”, noma ingahluleli kahle isiginali ethi “0” njengesignali ethi “1″. Ngakho-ke, umsebenzi we-FEC wenza ikhodi yolwazi ibe yikhodi enamandla athile okulungisa iphutha kusishumeki sesiteshi ekugcineni kokuthumela, futhi isikhiphi khodi sesiteshi ekugcineni kokwamukela sikhipha ikhodi etholiwe. Uma inani lamaphutha akhiqizwe ekudluliseni lingaphakathi kwebanga lamandla okulungisa amaphutha (amaphutha angaqhubeki), idikhoda izothola futhi ilungise amaphutha ukuze kuthuthukiswe ikhwalithi yesiginali.
I-2, Izinhlobo ezimbili zezindlela zokucubungula isignali ezitholiwe ze-FEC
I-FEC ingahlukaniswa ngezigaba ezimbili: ukuqopha izinqumo eziqinile kanye nokuqopha izinqumo ezithambile. Ukuqopha izinqumo eziqinile kuyindlela yokukhipha amakhodi esekelwe ekubukeni okuvamile kwekhodi yokulungisa iphutha. Idekhoda ithumela umphumela wesinqumo kusikhikhoda, futhi isikhiphi sisebenzisa isakhiwo se-algebraic se-codeword ukuze silungise iphutha ngokuya ngomphumela wesinqumo. Ukukhipha amakhodi okuthambile kwesinqumo kuqukethe ulwazi lwesiteshi oluningi kunokuqoshwa kwezinqumo ezinzima. Idikhoda ingalusebenzisa ngokugcwele lolu lwazi ngokukhipha amakhodi emathubeni, ukuze kutholwe inzuzo enkulu yokubhala ikhodi kunokuqopha izinqumo ezinzima.
3. Umlando wokuthuthuka we-FEC
I-FEC ihlangabezane nezizukulwane ezintathu ngokwesikhathi nokusebenza. Isizukulwane sokuqala se-FEC samukela ikhodi yokuvimba yesinqumo esinzima, ummeleli ojwayelekile yi-RS (255239), ebhalwe kuzindinganiso ze-ITU-T G.709 kanye ne-ITU-T g.975, futhi i-codeword overhead ingu-6.69%. Lapho okukhiphayo ber=1e-13, inzuzo yayo inetha lekhodi cishe i-6dB. Isizukulwane sesibili i-FEC yamukela isinqumo esinzima esihlanganiswe ngekhodi, futhi sisebenza ngokugcwele ukuhlanganisa, ukushiya phakathi, ukuhlukanisa amakhodi okuphindaphindayo kanye nobunye ubuchwepheshe. I-codeword overhead isengu-6.69%. Lapho okukhiphayo okungu-ber=1e-15, inzuzo yayo yenetha yekhodi ingaphezu kuka-8dB, engasekela izidingo zokudlulisela ibanga elide zezinhlelo ze-10G kanye ne-40g. I-FEC yesizukulwane sesithathu ithatha isinqumo esithambile, futhi i-codeword overhead yi-15% - 20%. Uma okukhiphayo okungu-ber=1e-15, inzuzo yokufakwa kwekhodi inetha ifinyelela cishe ku-11db, engasekela izimfuneko zokudlulisela ibanga elide zezinhlelo ezingu-100g noma ngisho ne-super 100g.
4, Ukusetshenziswa kwe-FEC kanye ne-100g module optical
Umsebenzi we-FEC usetshenziswa kumamojula we-optical wejubane eliphezulu njenge-100g. Ngokuvamile, uma lo msebenzi uvuliwe, ibanga lokudlulisela lemojula ye-high speed optical lizoba lide kunalokho lapho umsebenzi we-FEC ungavulwanga. Isibonelo, amamojula angu-100g optical ngokuvamile angafinyelela ukudluliselwa ku-80km. Uma umsebenzi we-FEC uvuliwe, ibanga lokudlulisela nge-fiber optical yemodi eyodwa lingafinyelela ku-90km. Kodwa-ke, ngenxa yokubambezeleka okungenakugwemeka kwamanye amaphakethe edatha ohlelweni lokulungiswa kwamaphutha, akuwona wonke amamojula okubona ngesivinini esiphezulu anconywayo ukuze kusebenze lo msebenzi.
Isihloko esingenhla simayelana ''Umsebenzi we-Optical module FEC'' olethwe kuwe yi-Shenzhen HDV photoelectric Technology Co., Ltd. Imikhiqizo yemojuli ekhiqizwe ikhava yenkampani amamojula we-fiber optical, Amamojula we-Ethernet, amamojula we-fiber optical transceiver, amamojula okufinyelela kwefiber optical, Amamojula we-SSFP optical, futhiImicu ye-Optical SFP, njll. Imikhiqizo yemojula engenhla inganikeza ukwesekwa kwezimo zenethiwekhi ezahlukene. Ithimba le-R&D elichwepheshile neliqinile lingasiza amakhasimende anezinkinga zobuchwepheshe, futhi ithimba lebhizinisi elicabangayo nelichwepheshile lingasiza amakhasimende ukuthi athole amasevisi ekhwalithi ephezulu ngesikhathi sokubonisana kwangaphambilini nomsebenzi wangemuva kokukhiqiza. Siyakwamukela ku Xhumana nathi nganoma yiluphi uhlobo lombuzo.