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1、光纖通信系統(tǒng)5B6B碼譯碼的設(shè)計與仿真IV中文摘要在電力系統(tǒng)通信中，數(shù)字光纖通信由于其本身的優(yōu)點得到越來越廣泛的應(yīng)用。在數(shù)字光纖通信系統(tǒng)中，從電端機傳輸過來的電信號均要結(jié)合數(shù)字光纖通信傳輸?shù)奶攸c經(jīng)過線路碼型的轉(zhuǎn)換。通過線路碼型的轉(zhuǎn)變平衡數(shù)字碼流中的“0”和“1”碼字，從而避免碼流中出現(xiàn)長“0”或者長“1”的現(xiàn)象。在數(shù)字光纖通信系統(tǒng)中比較常用的線路碼型就是mBnB碼型，mBnB線路碼型的最大優(yōu)點是最大相同碼元連碼數(shù)少、定時信息豐富、且有簡單成熟的誤碼監(jiān)測與碼組同步的方法。5B6B碼編碼是將自己編寫的數(shù)據(jù)按照一定的規(guī)律，編成6B碼流后輸出；而譯碼則是將傳輸?shù)浇邮諜C的6B碼流，翻譯成5B碼

2、流后輸出。5B6B碼譯碼的過程是編碼的逆過程，本文主要涉及到的是譯碼的過程，譯碼部分由序列產(chǎn)生模塊、緩沖模塊以及譯碼模塊構(gòu)成。這篇論文重要介紹了光纖通信系統(tǒng)的優(yōu)缺點，組成以及發(fā)展趨勢；常見的線路碼型；Quartus2軟件的介紹；5B6B碼的譯碼原理和設(shè)計，最后對程序以及電路譯碼的仿真，最終得到正確的結(jié)果。關(guān)鍵詞：5B6B碼譯碼；FPGA；VHDL語言；Quartus2軟件；波形仿真IV5B6BCodeDecodingofOpticalFiberCommunicationSystemDesignandSimulationABSTRACTInpowersystemcommunicatio

3、n,digitalopticalfibercommunicationbecauseofitsadvantagestogetitselfmoreandmorewidelyused.Inthedigitalopticalfibercommunicationsystem,fromtheelectricmachinetransmissiontocomeovertotheelectricalsignalstocombinethecharacteristicsofthedigitalopticalfibercommunicationtransmissionviathelinetypeconver

4、sion.Throughbalancethedigitalstreamlinetype"0"and"1"inthecodeword,thusavoidingstreamin"0"or"1"long.ArefrequentlyusedinthedigitalopticalfibercommunicationsysteminthelinetypeismBnBtype,thebiggestadvantageofthistypeisthesamebiggestmBnBlineelementevenlessyards,timing,abundantinformation,simpleandma

5、turemethodoferrormonitoringandsynchronizationcodegroup.5B6Bcodecodingistowriteyourowndata,accordingtocertainrulesintoafter6Bstreamoutput;Thedecodingis6Bstreamwillbetransmittedtothereceiver,aftertranslatedinto5Bstreamoutput.5B6Bcodedecodingistheprocessoftheinverseprocessofcoding,thispapermainlyi

6、nvolvesistheprocessofdecoding,decodingpartproducedbysequencemoduleandbuffermoduleanddecodingmodule.Thispapertheadvantagesanddisadvantagesofimportantopticalfibercommunicationsystemareintroduced,thecompositionanddevelopmenttrend;Commonlinetype;TheintroductionofIVQuartus2software;5B6Bcodedecodingp

7、rincipleanddesign,finally,thedecodingprocessandcircuitsimulation,finallygetthecorrectresult.KEYWORD：5B6Bdecoding;FPGA;VHDLlanguage;Quartus2software;WaveformsimulationIV目錄第一章光纖通信系統(tǒng)11.1光纖通信的優(yōu)點與缺點11.2光纖通信系統(tǒng)的組成21.3光纖通信的發(fā)展趨勢2第二章光纖通信中的線