Chiyambi chakugwiritsa ntchito RF optical transmission RF over Fiber

Chiyambi cha kagwiritsidwe ntchito kaRF kuwala kufalaRF pa Fiber

M'zaka zaposachedwa, ukadaulo wolumikizirana ndi ma microwave komanso ukadaulo wapafoni wakula mwachangu. Matekinoloje onse awiriwa apita patsogolo kwambiri m'magawo awo, komanso zapangitsa kuti pakhale chitukuko chofulumira cha mauthenga a m'manja ndi mauthenga otumizira mauthenga, zomwe zikubweretsa ubwino waukulu m'miyoyo ya anthu. Njira ziwiri zamakono zoyankhulirana ndi microwave ndi photoelectric kulankhulana zili ndi ubwino wawo, koma zimakhalanso ndi zovuta zina zomwe sizingatheke. Kutumiza kwamagetsi kumafuna kulumikizana kwakuthupi, ndipo pali zofooka zina pakusinthasintha, kulumikizana mwachangu komanso kuyenda kwa zomangamanga. Kulankhulana kwa ma microwave kuli ndi zolephera zina pakufalitsa mtunda wautali komanso mphamvu yayikulu, ndipo ma microwave amafunikira kukulitsa kwapang'onopang'ono ndikutumizanso, ndipo bandwidth yotumizira imachepetsedwa ndi ma frequency onyamulira. Izi zidapangitsa kuti kulumikizana kwaukadaulo wa microwave ndi kuwala kwa Fiber transmission, ndiko kuti, ukadaulo wa Radio over Fiber(ROF), womwe nthawi zambiri umatchedwa.RF pa Fiber, kapena ukadaulo wakutali wa wailesi. Gawo logwiritsidwa ntchito kwambiri la RF paukadaulo wa Fiber ndi gawo la kulumikizana kwa fiber optical, kuphatikiza masiteshoni am'manja, makina ogawa, ma burodi opanda zingwe, TV ya chingwe, kulumikizana kwapaintaneti ndi zina zotero. M'zaka zaposachedwa, ndi kukwera kwa ma microwave photonics, ukadaulo wa RF over Fiber wakhala ukugwiritsidwa ntchito kwambiri mu microwave photon radar, kulumikizana kwa UAV, kafukufuku wakuthambo ndi zina. Malinga ndi mitundu yosiyanasiyana ya ma laser modulation, kulumikizana kwa laser kumatha kugawidwa m'njira yosinthira mkati ndikusintha kwakunja, komwe kumagwiritsidwa ntchito kwambiri ndikusintha kwakunja, ndipo RF over Fiber kutengera kusinthasintha kwa laser yakunja ikufotokozedwa patsamba lino. Maulalo a RF over Fiber amapangidwa makamaka ndi ma transceiver owoneka, kufalitsa, ndiZogwirizana ndi ROF, monga zikuwonekera pachithunzichi:

Chidule chachidule cha gawo lowala. LD imagwiritsidwa ntchito kwambiriDFB lasers(mtundu wa mayankho ogawidwa), omwe amagwiritsidwa ntchito ngati phokoso lochepa, kugwiritsa ntchito mitundu yosiyanasiyana, ndi ma laser a FP(Fabry-Perot type) amagwiritsidwa ntchito pazinthu zosafunikira kwenikweni. Mafunde omwe amagwiritsidwa ntchito kwambiri ndi 1064nm ndi 1550nm. PD ndiPhotodetector, ndipo kumapeto kwina kwa ulalo wa fiber optic, kuwalako kumadziwika ndi PIN photodiode ya wolandila, yomwe imasintha kuwala kukhala chizindikiro chamagetsi kenako kulowa mugawo lodziwika bwino lamagetsi. Ulusi wowoneka bwino womwe umagwiritsidwa ntchito polumikizira wapakati nthawi zambiri umakhala wamtundu umodzi komanso ulusi wamitundu yambiri. Ulusi wamtundu umodzi umagwiritsidwa ntchito kwambiri pa netiweki ya msana chifukwa chakuchepa kwake komanso kutayika kochepa. Multimode fiber imakhala ndi ntchito inayake mumaneti am'deralo chifukwa ndi yotsika mtengo kupanga ndipo imatha kunyamula ma transmission angapo nthawi imodzi. Kutsika kwa chizindikiro cha kuwala mu fiber ndi kochepa kwambiri, kokha ~ 0.25dB / km pa 1550nm.

Kutengera mawonekedwe a kufalikira kwa mzere komanso kufalikira kwa kuwala, maulalo a ROF ali ndi izi zabwino mwaukadaulo:

• Kutayika kochepa kwambiri, kuchepa kwa fiber pansi pa 0.4 dB / km

• Kutumiza kwa Fiber ultra-bandwidth, kutayika kwa fiber mosadalira pafupipafupi

• Lumikizani ndi mphamvu yonyamula ma siginolo/bandiwifi mpaka 110GHz• Electromagnetic Interference (EMI) resistance (nyengo yoipa simakhudza chizindikiro)

• Mtengo wotsika pa mita imodzi • Ulusi umasinthasintha komanso wopepuka, wolemera pafupifupi 1/25 ya waveguide ndi 1/10 ya chingwe coaxial

• Makonzedwe osavuta komanso osinthika a ma electro-optic modulators (zachipatala ndi makina ojambulira zithunzi)