Ngophuhliso lwenkqubo yonxibelelwano lwe-optical kunye nomgama omde, umthamo omkhulu kunye nesantya esiphezulu, ngakumbi xa isantya se-wave wave sivela kwi-40g ukuya kwi-100g okanye nakwi-super 100g, i-chromatic dispersion, i-nonlinear effect, i-polarization mode dispersion kunye nezinye iziphumo zokuhambisa kwi-fiber optical ziya kuchaphazela kakhulu uphuculo olongezelelweyo lwezinga lothumelo kunye nomgama wothumelo. Ke ngoko, iingcali zeshishini ziyaqhubeka nokuphanda nokuphuhlisa iintlobo zekhowudi ze-FEC kunye nokusebenza okungcono ukufumana inzuzo ephezulu yekhowudi (NCG) kunye nokusebenza ngcono kokulungiswa kwempazamo, ukuze kuhlangatyezwane neemfuno zophuhliso olukhawulezayo lweenkqubo zonxibelelwano lwe-optical.
I-1, intsingiselo kunye nomgaqo we-FEC
I-FEC (ukulungiswa kwempazamo phambili) yindlela yokwandisa ukuthembeka konxibelelwano lwedatha. Xa isignali ye-optical iphazamisekile ngexesha lothumelo, isiphelo sokufumana sinokujonga kakubi i-"1" isignali njenge "0" yesiginali, okanye ungaqondi kakuhle uphawu "0" njenge "1" uphawu. Ngoko ke, umsebenzi we-FEC wenza ikhowudi yolwazi kwikhowudi enegunya elithile lokulungiswa kwephutha kwi-encoder yesiteshi ekupheleni kokuthumela, kunye ne-decoder yesiteshi ekupheleni kokufumana ikhowudi efunyenweyo. Ukuba inani leempazamo eziveliswe kwi-transmission lingaphakathi koluhlu lwekhono lokulungiswa kwempazamo (iimpazamo ezingapheliyo), i-decoder iya kufumana kwaye ilungise iimpazamo ukuphucula umgangatho wesignali.
I-2, Iindidi ezimbini zeendlela ezifunyenweyo zokucwangcisa umqondiso we-FEC
I-FEC inokohlulwa ibe ziindidi ezimbini: ukucazulula ngesigqibo esinzima kunye nesigqibo esithambileyo. Ukwenziwa kwesigqibo esinzima yindlela yokuguqula ikhowudi esekelwe kwimbono yemveli yekhowudi yokulungisa impazamo. I-decoder ithumela umphumo wesigqibo kwi-decoder, kwaye i-decoder isebenzisa i-algebraic structure ye-codeword ukulungisa impazamo ngokwesiphumo sesigqibo. Ukwenziwa kweekhowudi kwezigqibo ezithambileyo kunolwazi oluthe kratya lwetshaneli kunokugqiba ngesigqibo esinzima. Idikhowuda ingalusebenzisa ngokupheleleyo olu lwazi ngokuguqula iikhowuwudi ezinokwenzeka, ukuze kufumaneke inzuzo enkulu yokukhowudwa kunokwakheka kwezigqibo ezinzima.
3, Imbali yoPhuhliso ye-FEC
I-FEC iye yafumana izizukulwana ezithathu ngokwexesha kunye nokusebenza. Isizukulwana sokuqala se-FEC samkela ikhowudi yebhloko yesigqibo esinzima, ummeli oqhelekileyo ngu-RS (255239), ebhalwe kwi-ITU-T G.709 kunye ne-ITU-T g.975 imigangatho, kunye ne-codeword overhead yi-6.69%. Xa imveliso i-ber=1e-13, inzuzo yayo yokubhalwa kwekhowudi imalunga ne-6dB. Isizukulwana sesibini i-FEC samkela isigqibo esinzima sekhowudi edityanisiweyo, kwaye sisebenza ngokubanzi ukuhambelana, ukushiyana, ukucacisa itekhnoloji kunye nobunye ubuchwepheshe. I-codeword overhead iseyi-6.69%. Xa i-output ber = 1e-15, inzuzo yayo ye-coding i-net ingaphezulu kwe-8dB, enokuxhasa iimfuno zokuhambisa umgama omde we-10G kunye ne-40g iinkqubo. Isizukulwana sesithathu se-FEC sithatha isigqibo esithambileyo, kwaye i-codeword overhead yi-15% - 20%. Xa imveliso ye-ber = 1e-15, inzuzo yekhowudi yomnatha ifikelela malunga ne-11db, enokuxhasa iimfuno zokuhambisa umgama omde we-100g okanye iinkqubo eziphezulu ze-100g.
4, Ukusetyenziswa kwe-FEC kunye ne-100g imodyuli ye-optical
Umsebenzi we-FEC usetyenziswa kwiimodyuli ze-high-speed optical ezifana ne-100g. Ngokuqhelekileyo, xa lo msebenzi uvuliwe, umgama wokuhanjiswa kwemodyuli ye-high-speed optical iya kuba yinde kunoko xa umsebenzi we-FEC ungavulwanga. Umzekelo, iimodyuli ze-100g zamehlo zinokufikelela ngokubanzi kwi-80km. Xa umsebenzi we-FEC uvuliwe, umgama wokudluliselwa nge-fiber optical mode enye unokufikelela kwi-90km. Nangona kunjalo, ngenxa yokulibaziseka okungenakuphepheka kwezinye iipakethi zedatha kwinkqubo yokulungiswa kweempazamo, ayizizo zonke iimodyuli ze-high-speed optical zinconywa ukuba zivumele lo msebenzi.
Esi sihloko singentla simalunga ''Umsebenzi wemodyuli ye-Optical FEC'' eziswe kuwe yi-Shenzhen HDV photoelectric Technology Co., Ltd. Iimveliso zemodyuli eziveliswe yikhava yenkampani. iimodyuli zefiber optical, Iimodyuli ze-Ethernet, iimodyuli ze-fiber optical transceiver, iimodyuli zokufikelela kwifiber optical, Iimodyuli ze-SSFP ezibonakalayo, kwayeI-SFP optical fibers, njl. Ezi mveliso zemodyuli zingentla zinokubonelela ngenkxaso yeemeko ezahlukeneyo zenethiwekhi. Iqela le-R&D elinobuchule kunye nelomeleleyo linokunceda abathengi abanemiba yobugcisa, kwaye iqela leshishini elicingayo nelinobuchule linokunceda abathengi bafumane iinkonzo ezikumgangatho ophezulu ngexesha lokubonisana kwangaphambili kunye nomsebenzi wasemva kokuvelisa. Wamkelekile kuwe Qhagamshelana nathi kulo naluphi na uhlobo lombuzo.