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1、華中科技大學(xué)碩士學(xué)位論文摘要隨著現(xiàn)代通信技術(shù)的高速發(fā)展,通信容量的不斷增加,通信安全越來(lái)越受到人們的重視,因此迫切需要研究開(kāi)發(fā)具有高速、高保密性的新一代信息安全保密技術(shù)。近幾年,作為新型的保密技術(shù)的光混沌保密通信技術(shù)發(fā)展迅速,由于具有高寬帶、不可預(yù)測(cè)性和復(fù)雜的非線(xiàn)性動(dòng)力學(xué)特性等優(yōu)點(diǎn),是對(duì)傳統(tǒng)的保密系統(tǒng)的強(qiáng)力挑戰(zhàn)。因此研究具有高維數(shù),易于調(diào)試,小巧輕便的光學(xué)混沌保密通信系統(tǒng)具有重大研究意義。近年來(lái),國(guó)內(nèi)外的相關(guān)技術(shù)發(fā)展迅速,目前國(guó)際上有四種產(chǎn)生光混沌的方法以及三種相關(guān)的調(diào)制信息信號(hào)的方法。而設(shè)計(jì)一個(gè)光混沌保密系統(tǒng)的關(guān)鍵在于產(chǎn)生混沌的方法,以及同步方式的選擇。本文結(jié)合國(guó)內(nèi)外
2、的研究狀況,比較幾種產(chǎn)生光混沌方法的優(yōu)缺點(diǎn)后,對(duì)傳統(tǒng)的摻鉺光纖反饋環(huán)進(jìn)行改進(jìn)來(lái)產(chǎn)生混沌激光,并對(duì)各個(gè)系統(tǒng)模塊功能進(jìn)行了闡述,同時(shí)對(duì)系統(tǒng)方程進(jìn)行調(diào)試和仿真,驗(yàn)證了方案的可行性?;诠馔ㄐ欧抡孳浖ptisystem具體的實(shí)現(xiàn)了實(shí)驗(yàn)光路,利用相空間重構(gòu)理論對(duì)光路產(chǎn)生的混沌序列進(jìn)行分析、計(jì)算出平均李雅普諾夫指數(shù)及相關(guān)參數(shù),證明了保密通信的可靠性,實(shí)現(xiàn)了系統(tǒng)具有高維數(shù)、小巧輕便的設(shè)計(jì)目標(biāo)。關(guān)鍵詞:光混沌,保密通信,摻鉺光纖,OptisystemI華中科技大學(xué)碩士學(xué)位論文AbstractWiththerapiddevelopmentofmoderncommunicationtec
3、hnologyandincreasesofcommunicationchannelcapacity,peoplepaymoreandmoreattentiontotheimportanceofthecommunicationsecuritytheseyears,soit'sofurgentneedtoresearchanddevelopanewinformationsecuritytechnologywhichishigh-speedandhigh-confidentiality.Inrecentyears,asanewtypeofconfidentialtechnol
4、ogy,thedevelopmentofthechaos-basedsecureopticalcommunicationsisrapid,duetoitshighdimensionalbroadband,unpredictabilityandcomplexnonlineardynamic.It'sagreatchallengetothetraditionalsecrecysystems.Therefore,theresearchonopticalchaoticsecurecommunicationsystemwhichhashighdimensionandisporta
5、bleandeasytodebug,hasimportantsignificance.Therelevanttechnologyathomeandabroadarebothdevelopingrapidlyinrecentyears,therearefourmethodofopticalchaosproductionandthreerelatedmethodofimformationsignalmodulationintheworldcurrently.Andthemostimportantfactorofthedesignofalightchaoticencrypti
6、onsystemisthemethodofchaoproduction,andthechooseofsynchronousway.Thispaperhascombineddomesticandforeignresearchstatus,comparedseveralwaysoflightchaosproductionaccordingtotheiradvantagesanddisadvantages,improvedthetraditionalmethodofchaoticproductioncbyimprovingtheerbiumfiberfeedbackloop,
7、anddiscussedthevarioussystems'modulefunction,andalsodebuggedandsimulatedthesystemequationwhichprovedthefeasibilityofthescheme.Thispaperisbasedonopticalcommunicationsimulationsoftwareoptisystemrealizedtheexperimentalopticalcircuit,usedthetheoryofphasespacereconstructiontoa