光碼分復用關(guān)鍵技術(shù)及注入鎖定半導體脈沖光源研究.pdf

1、天津大學博士學位論文光碼分復用關(guān)鍵技術(shù)及注入鎖定半導體脈沖光源研究姓名：方曉惠申請學位級別：博士專業(yè)：物理電子學指導教師：李世忱20030301墨鯊查堂堡絲苧ABSTRACTWiththeexpandsofmultimedia，InternetandBISDN，theincreasingdemandhasbeenpresentedforhighercommunicationcapacitiesandmorequicklytransmis

2、sionspeed，allopticalcommunicationhasbecomethedeveloptargetofopticalcommunication，andallopticallocalareanetworkisoneofresearchissuesofopticalcommunicationInthispaper，twopartworkhasbeenpresented：1)thetechnologyofopticalcod

3、e—divisionmultipleaccess(OCDMA)encoding／decodingbasedonfiberBragggratinghasbeenstudied；2)pulseinjectionseedingforsingleanddualwavelengthopticalpulsegenerationusingsemiconductorlaserhasbeenstudiedexperimentally1Researchof

4、OCDMAencoding／decodingbasedonstepchirpedfibergrating1)Aspectralphaseopticalcode—divisionmultiple—access(OCDMA)encoder／decoderbasedonstepchirpedfiberBraggGratings(SCFBGs)isdeveloped2)AmethodisproposedforrealizingOCDMAenco

5、ding／decodinginstepchirpedfiberBragggratingbymappingthemsequenceaddresscodeSimulationresultforencoder／decodershowsgoodcorrelationasexpectedThefactorsinfluencingcorrelationpropertyisalsodiscussed3)TheperformanceforOCDMAsy

6、stembasedonSCFBGsencoder／decoderisanalyzed4)ThemethodforfabricatingSCFBGsisintroduced，andprincipleandparametersofmaskforSCFBGiSalsointroduced2Generationforelectricallysinglewavelengthtunableopticalpulseinpulseinjectionse

7、edingscheme1)Amethodforelectricallywavelengthtunableopticalshortpulsesgenerationbypulseinjectionseedingisdeveloped，withwhichaPabryP6rot(F—P)laserdiodecombinedatunablefilterandanerbiumdopedfiberamplifier(EDFA)isusedasthee

8、xternal—injectionseedinglightsourceThesidemodesuppressionratio(SMSR)achievedisbetterthan25dBoverthewavelengthtuningrangeof9nmThesystemissimpleandoflowCost2)Asimpleandrobustsystemisdevelopedtogenerateelectricallywavelengt