Kev Taw Qhia rau RF hla fiber System

Kev Taw Qhia rau RF hla fiber System

RF hla fiberyog ib qho ntawm cov ntawv thov tseem ceeb ntawm microwave photonics thiab qhia txog cov txiaj ntsig tsis muaj qhov sib piv hauv cov teb siab heev xws li microwave photonic radar, astronomical radio telephoto, thiab unmanned aerial vehicle communication.

RF hla fiberROF txuasyog feem ntau yog tsim los ntawm cov khoom xa tawm teeb pom kev zoo, cov khoom txais teeb pom kev zoo thiab cov xov hluav taws xob. Raws li pom hauv Daim Duab 1.

Cov khoom xa tawm kho qhov muag: Cov lasers tawm tswv yim faib tawm (DFB laser) siv rau hauv cov suab nrov qis thiab cov ntawv thov siab dynamic, thaum FP lasers siv rau hauv cov ntawv thov nrog cov kev xav tau qis dua. Cov lasers no muaj wavelengths ntawm 1310nm lossis 1550nm.

Lub tshuab txais teeb pom kev zoo: Ntawm qhov kawg ntawm qhov txuas fiber ntau, lub teeb raug ntes los ntawm PIN photodiode ntawm lub tshuab txais, uas hloov lub teeb rov qab mus rau tam sim no.

Cov xov hluav taws xob kho qhov muag: Sib piv rau cov fiber ntau hom, cov fiber ib hom siv rau hauv cov kab sib txuas vim lawv qhov kev tawg tsawg thiab kev poob qis. Ntawm qhov ntev ntawm 1310 nm, qhov kev txo qis ntawm cov teeb liab kho qhov muag hauv cov fiber kho qhov muag tsawg dua 0.4dB / km. Ntawm 1550 nm, nws tsawg dua 0.25dB / km.

Qhov txuas ROF yog ib qho kev sib kis kab linear. Raws li cov yam ntxwv ntawm kev sib kis kab linear thiab kev sib kis optical, qhov txuas ROF muaj cov txiaj ntsig zoo hauv qab no:

• Kev poob qis heev, nrog rau kev txo qis ntawm cov fiber tsawg dua 0.4 dB / km

• Kev sib kis ultra-bandwidth ntawm optical fiber, kev poob ntawm optical fiber yog ywj pheej ntawm zaus

Qhov txuas muaj lub peev xwm nqa tau teeb liab / bandwidth siab dua, txog li DC txog 40GHz

• Tiv thaiv kev cuam tshuam hluav taws xob (EMI) (Tsis muaj kev cuam tshuam rau lub teeb liab thaum huab cua phem)

• Tus nqi qis dua rau ib 'meter' • Cov fibers optical muaj kev ywj pheej ntau dua thiab sib dua, hnyav kwv yees li 1/25 ntawm cov waveguides thiab 1/10 ntawm cov coaxial cables

• Kev teeb tsa yooj yim thiab hloov pauv tau (rau cov tshuab thaij duab kho mob thiab tshuab)

Raws li cov khoom sib xyaw ntawm lub tshuab xa khoom siv kho qhov muag, RF hla lub tshuab fiber ntau tau muab faib ua ob hom: kev hloov kho ncaj qha thiab kev hloov kho sab nraud. Lub tshuab xa khoom siv kho qhov muag ntawm lub tshuab RF ncaj qha-modulated hla lub tshuab fiber ntau txais yuav lub tshuab DFB ncaj qha-modulated, uas muaj qhov zoo ntawm tus nqi qis, me me thiab yooj yim kev koom ua ke, thiab tau siv dav. Txawm li cas los xij, txwv los ntawm lub tshuab laser DFB ncaj qha-modulated, lub tshuab RF ncaj qha-modulated hla fiber tsuas yog siv tau rau hauv qhov zaus hauv qab 20GHz. Piv nrog kev hloov kho ncaj qha, lub tshuab hloov kho sab nraud RF hla lub tshuab fiber ntau yog tsim los ntawm ib lub laser DFB ib zaug thiab lub tshuab hluav taws xob-optic modulator. Vim yog qhov loj hlob ntawm cov thev naus laus zis electro-optic modulator, lub tshuab hloov kho sab nraud RF hla lub tshuab fiber ntau tuaj yeem ua tiav cov ntawv thov hauv qhov zaus ntau dua 40GHz. Txawm li cas los xij, vim yog qhov ntxiv ntawmelectro-optic modulator, lub kaw lus nyuaj dua thiab tsis zoo rau kev siv. ROF txuas nce, suab nrov thiab dynamic range yog cov yam ntxwv tseem ceeb ntawm ROF txuas, thiab muaj kev sib txuas ze ntawm peb. Piv txwv li, tus lej suab nrov qis txhais tau tias muaj dynamic range loj, thaum qhov nce siab tsis yog tsuas yog xav tau los ntawm txhua lub kaw lus, tab sis kuj muaj kev cuam tshuam ntau dua rau lwm yam kev ua tau zoo ntawm lub kaw lus.