Intshayelelo ekusetyenzisweni kwe-RF optical transmission RF phezu kweFiber

Intshayelelo ekusebenziseniUthumelo lwe-RF opticalI-RF ngaphezulu kweFiber

Kwiminyaka yakutshanje, unxibelelwano lwe-microwave kunye netekhnoloji yonxibelelwano lwe-optical luye lwaphuhliswa ngokukhawuleza. Zombini ezi teknoloji zenze inkqubela phambili enkulu kwiinkalo zazo, kwaye zikhokelele ekuphuhlisweni ngokukhawuleza konxibelelwano oluphathwayo kunye neenkonzo zokudlulisa idatha, nto leyo ebangela ukuba kube lula kakhulu kubomi babantu. Ezi teknoloji zimbini zonxibelelwano lwe-microwave kunye nonxibelelwano lwe-photoelectric zineengenelo zazo, kodwa zikwanazo nezinye iingxaki ezingenakoyiswa. Ukudluliselwa kwe-Photoelectric kufuna uthungelwano olubonakalayo, kwaye kukho ezinye iingxaki kukuguquguquka, uthungelwano olukhawulezayo kunye nokuhambahamba kolwakhiwo. Unxibelelwano lwe-microwave luneentsilelo ezithile kuthungelwano olude kunye nomthamo omkhulu, kwaye i-microwave ifuna ukwandiswa rhoqo kwe-relay kunye nokudluliselwa kwakhona, kwaye i-bandwidth yothungelwano inqunyelwe yi-carrier frequency. Oku kukhokelele ekudityanisweni kwetekhnoloji yothungelwano lwe-microwave kunye ne-optical Fiber, oko kukuthi, itekhnoloji yeRadio over Fiber (ROF), edla ngokubizwa ngokuba yiyo.I-RF ngaphezulu kweFiber, okanye iteknoloji yerediyo ekude. Eyona ndawo isetyenziswa kakhulu kwiteknoloji yeRF phezu kweFiber yintsimi yonxibelelwano lwe-optical fiber, kubandakanya izikhululo zesiseko eziphathwayo, iinkqubo ezisasazwayo, i-broadband engenazingcingo, iTV yekhebula, unxibelelwano lwenethiwekhi yabucala njalo njalo. Kwiminyaka yakutshanje, ngokunyuka kwe-microwave photonics, iteknoloji yeRF phezu kweFiber isetyenziswa kakhulu kwi-microwave photon radar, unxibelelwano lwe-UAV, uphando lweenkwenkwezi kunye nezinye iinkalo. Ngokweentlobo ezahlukeneyo ze-laser modulation, unxibelelwano lwe-laser lunokwahlulwa lube yi-internal modulation kunye ne-external modulation, esetyenziswa kakhulu yi-external modulation, kwaye i-RF phezu kweFiber esekelwe kwi-external laser modulation ichazwe kweli phepha. Iikhonkco zeRF phezu kweFiber zenziwe ikakhulu yi-optical transceiver, i-transmission, kunyeAmakhonkco e-ROF, njengoko kubonisiwe kumfanekiso olandelayo:

Intshayelelo emfutshane ngenxalenye yokukhanya. I-LD isetyenziswa rhoqoIileyiza zeDFB(uhlobo lwempendulo olusasazwayo), olusetyenziswa kwingxolo ephantsi, usetyenziso lwe-high dynamic range, kunye nee-laser ze-FP (uhlobo lwe-Fabry-Perot) zisetyenziswa kwizicelo ezingabizi kakhulu. Ii-wavelengths ezisetyenziswa kakhulu yi-1064nm kunye ne-1550nm. I-PD yi-isixhobo sokubona iifoto, kwaye kwelinye icala lekhonkco le-fiber optic, ukukhanya kubonwa yi-PIN photodiode yesamkeli, eguqula ukukhanya kube yisignali yombane ize emva koko ibe yinyathelo eliqhelekileyo lokucubungula umbane. I-fiber optical esetyenziselwa uqhagamshelo oluphakathi idla ngokuba yi-single-mode kunye ne-multi-mode optical fiber. I-fiber ye-single-mode isetyenziswa rhoqo kwinethiwekhi yomqolo ngenxa yokusasazeka kwayo okuphantsi kunye nokulahleka okuphantsi. I-fiber ye-Multimode inesicelo esithile kwinethiwekhi yendawo kuba ingabizi kakhulu ukuyenza kwaye inokwamkela uthumelo oluninzi ngaxeshanye. Ukuncitshiswa kwesignali optical kwi-fiber kuncinci kakhulu, kuphela yi-~0.25dB/km kwi-1550nm.

Ngokusekelwe kwiimpawu zothumelo oluhambayo kunye nothumelo lwe-optical, iikhonkco ze-ROF zinezibonelelo zobugcisa ezilandelayo:

• Ukulahleka okuphantsi kakhulu, ukuncitshiswa kwefayibha kungaphantsi kwe-0.4 dB/km

• Ukudluliselwa kwe-fiber ultra-bandwidth, ukulahleka kwefayibha ngaphandle kobuninzi

• Ikhonkco elinomthamo ophezulu wokuthwala isignali/i-bandwidth ukuya kuthi ga kwi-110GHz • Ukumelana nokuphazamiseka kwe-Electromagnetic (EMI) (imozulu embi ayichaphazeli isignali)

• Ixabiso eliphantsi ngemitha nganye • Ifayibha iguquguquka ngakumbi kwaye ilula, inobunzima obumalunga ne-1/25 ye-waveguide kunye ne-1/10 yentambo ye-coaxial

• Ulungiselelo olulula noluguquguqukayo lwee-electro-optic modulators (kwiinkqubo zemifanekiso yezonyango neyemishini)