Kev Taw Qhia rau Daim Ntawv Thov ntawm RF optical transmission RF hla Fiber

Kev Taw Qhia rau daim ntawv thov ntawmKev xa hluav taws xob RFRF hla Fiber

Nyob rau xyoo caum dhau los no, kev sib txuas lus microwave thiab kev siv tshuab sib txuas lus optical tau tsim kho sai heev. Ob lub thev naus laus zis tau ua tiav zoo hauv lawv cov teb, thiab kuj ua rau muaj kev txhim kho sai ntawm kev sib txuas lus mobile thiab kev xa cov ntaub ntawv, coj kev yooj yim rau tib neeg lub neej. Ob lub thev naus laus zis ntawm kev sib txuas lus microwave thiab kev sib txuas lus photoelectric muaj lawv tus kheej qhov zoo, tab sis lawv kuj muaj qee qhov tsis zoo uas tsis tuaj yeem kov yeej. Kev xa xov photoelectric xav tau kev sib txuas lus lub cev, thiab muaj qee qhov tsis txaus ntseeg hauv kev ywj pheej, kev sib txuas lus ceev ceev thiab kev txav mus los ntawm kev tsim kho. Kev sib txuas lus microwave muaj qee qhov tsis txaus ntseeg hauv kev xa mus deb thiab muaj peev xwm loj, thiab microwave xav tau kev nthuav dav relay thiab rov xa dua, thiab bandwidth xa mus yog txwv los ntawm zaus nqa khoom. Qhov no ua rau muaj kev koom ua ke ntawm microwave thiab optical Fiber kis tau technology, uas yog, Xov tooj cua hla Fiber (ROF) technology, uas feem ntau hu uaRF hla Fiber, lossis thev naus laus zis xov tooj cua nyob deb. Qhov chaw siv dav tshaj plaws ntawm RF hla Fiber thev naus laus zis yog qhov chaw ntawm kev sib txuas lus fiber ntau, suav nrog cov chaw nres tsheb hauv paus, cov kab ke faib tawm, wireless broadband, cable TV, kev sib txuas lus hauv network ntiag tug thiab lwm yam. Nyob rau hauv xyoo tas los no, nrog rau kev nce ntawm microwave photonics, RF hla Fiber thev naus laus zis tau siv dav hauv microwave photon radar, kev sib txuas lus UAV, kev tshawb fawb txog hnub qub thiab lwm yam teb. Raws li ntau hom kev hloov kho laser, kev sib txuas lus laser tuaj yeem faib ua kev hloov kho sab hauv thiab kev hloov kho sab nraud, qhov feem ntau siv yog kev hloov kho sab nraud, thiab RF hla Fiber raws li kev hloov kho laser sab nraud tau piav qhia hauv daim ntawv no. RF hla Fiber txuas feem ntau yog tsim los ntawm optical transceiver, kis tau tus mob, thiabCov kev sib txuas ntawm ROF, raws li pom hauv daim duab hauv qab no:

Kev qhia luv luv txog qhov teeb. LD feem ntau sivDFB lasers(hom kev tawm tswv yim faib tawm), uas siv rau cov suab nrov qis, cov ntawv thov dynamic siab, thiab FP (Fabry-Perot hom) lasers siv rau cov ntawv thov uas tsis tas yuav siv ntau. Cov wavelengths feem ntau siv yog 1064nm thiab 1550nm. PD yog ib qholub tshuab ntes duab, thiab ntawm qhov kawg ntawm qhov txuas fiber optic, lub teeb raug ntes los ntawm PIN photodiode ntawm lub receiver, uas hloov lub teeb mus rau hauv lub teeb liab hluav taws xob thiab tom qab ntawd mus rau hauv cov kauj ruam ua hluav taws xob paub zoo. Lub fiber optical siv rau kev sib txuas nruab nrab feem ntau yog ib hom thiab ntau hom fiber optical. Ib hom fiber feem ntau siv hauv lub network backbone vim nws qhov kev faib tawm tsawg thiab poob qis. Multimode fiber muaj qee daim ntawv thov hauv lub network hauv zos vim nws pheej yig rau kev tsim khoom thiab tuaj yeem ua raws li ntau qhov kev sib kis tib lub sijhawm. Qhov attenuation ntawm lub teeb liab optical hauv lub fiber yog me heev, tsuas yog ~ 0.25dB / km ntawm 1550nm.

Raws li cov yam ntxwv ntawm kev sib kis kab thiab kev sib kis kho qhov muag, ROF txuas muaj cov txiaj ntsig zoo hauv qab no:

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

• Kev sib kis fiber ntau heev, kev poob fiber ywj pheej ntawm zaus

• Txuas nrog lub peev xwm nqa tau teeb liab siab dua / bandwidth txog li 110GHz • Kev cuam tshuam hluav taws xob (EMI) tsis kam (huab cua phem tsis cuam tshuam rau teeb liab)

• Tus nqi qis dua rau ib 'meter' • Fiber muaj kev ywj pheej ntau dua thiab sib dua, hnyav li ntawm 1/25 ntawm cov waveguide thiab 1/10 ntawm cov coaxial cable

• Kev npaj yooj yim thiab yoog tau ntawm cov electro-optic modulators (rau kev kho mob thiab kev siv tshuab duab)