Taw qhia rau daim ntawv thov ntawm RF optical kis tau tus mob RF tshaj Fiber

Taw qhia rau daim ntawv thov ntawmRF optical kis tau tus mobRF fiber ntau

Nyob rau hauv xyoo tsis ntev los no, microwave kev sib txuas lus thiab optical telecommunications technology tau tsim sai heev. Ob lub thev naus laus zis tau ua tiav zoo hauv lawv txoj haujlwm, thiab tseem tau coj mus rau kev txhim kho sai ntawm kev sib txuas lus ntawm tes thiab cov ntaub ntawv xa mus, ua kom 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 zoo, tab sis lawv kuj muaj qee qhov tsis zoo uas tsis tuaj yeem kov yeej. Kev xa xov hluav taws xob photoelectric yuav tsum muaj kev sib txuas ntawm lub cev, thiab muaj qee qhov kev tsis txaus ntseeg hauv kev yooj yim, kev sib txuas ceev ceev thiab kev txav mus los ntawm kev tsim kho. Microwave kev sib txuas lus muaj qee qhov tsis zoo hauv kev sib kis mus ntev thiab muaj peev xwm loj, thiab microwave xav tau relay amplification thiab rov xa rov qab, thiab kev sib kis bandwidth raug txwv los ntawm cov cab kuj zaus. Qhov no coj mus rau kev koom ua ke ntawm microwave thiab optical Fiber kis tau tus mob technology, uas yog, Xov tooj cua tshaj Fiber (ROF) technology, uas yog feem ntau hu ua.RF fiber ntau, los yog xov tooj cua zaus tej thaj chaw deb tshuab. Kev siv ntau tshaj plaws ntawm RF tshaj Fiber thev naus laus zis yog thaj chaw ntawm kev sib txuas lus fiber ntau, suav nrog cov chaw nres tsheb hauv xov tooj, cov tshuab faib, wireless broadband, cable TV, kev sib txuas lus ntiag tug thiab lwm yam. Nyob rau hauv xyoo tas los no, nrog kev nce ntawm microwave photonics, RF tshaj Fiber technology tau dav siv nyob rau hauv microwave photon radar, UAV kev sib txuas lus, kev tshawb fawb astronomy thiab lwm yam. Raws li ntau hom kev hloov kho laser, kev sib txuas lus laser tuaj yeem muab faib ua kev hloov kho sab hauv thiab sab nraud, feem ntau siv yog sab nraud kev hloov kho, thiab RF hla Fiber raws li kev hloov kho laser sab nraud tau piav qhia hauv daim ntawv no. RF tshaj Fiber txuas yog tsim los ntawm optical transceiver, kis tau tus mob, thiabROF links, raws li qhia hauv daim duab hauv qab no:

Kev taw qhia luv luv rau qhov teeb pom kev zoo. LD feem ntau sivDFB lasers(distributed tawm tswv yim hom), uas yog siv rau cov suab nrov tsawg, siab dynamic ntau daim ntawv thov, thiab FP (Fabry-Perot hom) lasers yog siv rau cov ntawv thov tsawg dua. Feem ntau siv wavelengths yog 1064nm thiab 1550nm. PD yog aphotodetector, thiab ntawm qhov kawg ntawm qhov txuas fiber ntau optic, lub teeb pom los ntawm tus PIN photodiode ntawm lub receiver, uas hloov lub teeb rau hauv lub teeb liab hluav taws xob thiab tom qab ntawd mus rau hauv cov txheej txheem kev paub txog hluav taws xob. Optical fiber ntau siv rau kev sib txuas nruab nrab yog feem ntau ib hom thiab ntau hom optical fiber ntau. Ib hom fiber ntau feem ntau yog siv rau hauv cov pob txha caj qaum vim tias nws tsis tshua muaj kev tawg thiab poob qis. Multimode fiber ntau muaj ib daim ntawv thov nyob rau hauv lub zos cheeb tsam network vim hais tias nws yog pheej yig los tsim thiab muaj peev xwm haum rau ntau yam kis tau tus mob tib lub sij hawm. Lub attenuation ntawm lub teeb liab optical nyob rau hauv lub fiber yog heev me me, tsuas yog ~ 0.25dB / km ntawm 1550nm.

Raws li cov yam ntxwv ntawm linear kis tau tus mob thiab kho qhov muag kis tau tus mob, ROF txuas muaj cov nram qab no kev zoo:

• poob qis heev, fiber ntau attenuation tsawg dua 0.4 dB/km

• Fiber ultra-bandwidth kis tau tus mob, fiber ntau tsis ywj pheej ntawm zaus

• Txuas nrog cov teeb liab siab dua nqa lub peev xwm / bandwidth mus txog 110GHz • Electromagnetic Interference (EMI) tsis kam ( huab cua tsis zoo tsis cuam tshuam cov teeb liab)

• Tus nqi qis dua rau ib lub 'meter' • Fiber ntau hloov tau yooj yim thiab hnav, hnyav txog 1/25 ntawm lub waveguide thiab 1/10 ntawm coaxial cable

• Ib qho yooj yim thiab hloov tau yooj yim ntawm electro-optic modulators (rau kev kho mob thiab kho tshuab imaging systems)