Isingeniso ekusetshenzisweni kwe-RF optical transmission RF phezu kwe-Fiber

Isingeniso ekusetshenzisweni kwe-Ukudluliswa kwe-RF opticalI-RF phezu kwe-Fiber

Emashumini eminyaka amuva nje, ukuxhumana nge-microwave kanye nobuchwepheshe bezokuxhumana nge-optical kuye kwathuthuka ngokushesha. Zombili lezi zobuchwepheshe ziye zathuthuka kakhulu emikhakheni yazo, futhi zaholela ekuthuthukisweni okusheshayo kwezinsizakalo zokuxhumana ngeselula kanye nokudlulisa idatha, okuletha lula kakhulu ezimpilweni zabantu. Lezi zobuchwepheshe ezimbili zokuxhumana nge-microwave kanye nokuxhumana nge-photoelectric zinezinzuzo zazo, kodwa futhi zinezinkinga ezithile ezingenakunqotshwa. Ukudluliselwa kwe-Photoelectric kudinga ukuxhumana ngokomzimba, futhi kukhona ukushiyeka okuthile ekuguquguqukeni, ukuxhumana okusheshayo kanye nokuhamba kokwakhiwa. Ukuxhumana nge-microwave kunezinkinga ezithile ekudlulisweni kwebanga elide kanye nomthamo omkhulu, futhi i-microwave idinga ukukhuliswa njalo kwe-relay kanye nokudluliselwa kabusha, futhi i-bandwidth yokudlulisela inqunyelwe imvamisa yenkampani. Lokhu kuholele ekuhlanganisweni kobuchwepheshe bokudlulisa i-microwave kanye ne-optical Fiber, okungukuthi, ubuchwepheshe be-Radio over Fiber (ROF), obuvame ukubizwa ngokuthiI-RF phezu kwe-Fiber, noma ubuchwepheshe obukude be-radio frequency. Insimu esetshenziswa kakhulu yobuchwepheshe be-RF phezu kwe-Fiber yinsimu yokuxhumana kwe-optical fiber, okuhlanganisa iziteshi zeselula, izinhlelo ezisatshalaliswayo, i-broadband engenantambo, i-cable TV, ukuxhumana kwenethiwekhi yangasese njalo njalo. Eminyakeni yamuva nje, ngokukhula kwe-microwave photonics, ubuchwepheshe be-RF phezu kwe-Fiber busetshenziswe kabanzi ku-radar ye-microwave photon, ukuxhumana kwe-UAV, ucwaningo lwezinkanyezi kanye neminye imikhakha. Ngokwezinhlobo ezahlukene zokuguqulwa kwe-laser, ukuxhumana kwe-laser kungahlukaniswa ngokuguqulwa kwangaphakathi kanye nokuguqulwa kwangaphandle, okusetshenziswa kakhulu ukuguqulwa kwangaphandle, kanti i-RF phezu kwe-Fiber esekelwe ekuguqulweni kwe-laser yangaphandle ichazwe kuleli phepha. Izixhumanisi ze-RF phezu kwe-Fiber zakhiwe kakhulu nge-transceiver ye-optical, i-transmission, kanyeIzixhumanisi ze-ROF, njengoba kuboniswe esithombeni esilandelayo:

Isingeniso esifushane ngengxenye yokukhanya. I-LD ivame ukusetshenziswaAma-laser e-DFB(uhlobo lwempendulo olusatshalaliswayo), olusetshenziselwa umsindo ophansi, izinhlelo zokusebenza zebanga elinamandla aphezulu, kanye nama-laser e-FP (uhlobo lwe-Fabry-Perot) asetshenziselwa izinhlelo zokusebenza ezingabizi kakhulu. Ama-wavelength asetshenziswa kakhulu yi-1064nm kanye ne-1550nm. I-PD iyi-umshini wokuthola izithombe, futhi ngakolunye uhlangothi lwesixhumanisi se-fiber optic, ukukhanya kutholwa yi-PIN photodiode yesamukeli, eguqula ukukhanya kube isignali kagesi bese kuba yisinyathelo esijwayelekile sokucubungula ugesi. I-fiber optical esetshenziselwa ukuxhumana okuphakathi ivame ukuba yi-fiber optical yemodi eyodwa kanye ne-multi-mode. I-fiber yemodi eyodwa ivame ukusetshenziswa kunethiwekhi yomgogodla ngenxa yokusabalala kwayo okuphansi kanye nokulahleka okuphansi. I-fiber yemodi eminingi inohlelo oluthile kunethiwekhi yendawo ngoba ishibhile ukuyikhiqiza futhi ingamukela ukudluliswa okuningi ngesikhathi esisodwa. Ukuncipha kwesignali optical ku-fiber kuncane kakhulu, kuphela ~0.25dB/km ku-1550nm.

Ngokusekelwe ezicini zokudlulisa okuqondile kanye nokudlulisa okubonakalayo, izixhumanisi ze-ROF zinezinzuzo zobuchwepheshe ezilandelayo:

• Ukulahlekelwa okuphansi kakhulu, ukuncishiswa kwefayibha kungaphansi kuka-0.4 dB/km

• Ukudluliswa kwe-fiber ultra-bandwidth, ukulahleka kwe-fiber kungakhathaliseki ukuthi imvamisa ingakanani

• Isixhumanisi nomthamo wokuthwala isignali/ububanzi obuphezulu obufika ku-110GHz • Ukumelana nokuphazamiseka kwe-Electromagnetic (EMI) (isimo sezulu esibi asisithinti isignali)

• Izindleko eziphansi ngemitha • I-fibre iguquguquka kakhudlwana futhi ilula, inesisindo esingaba yi-1/25 ye-waveguide kanye ne-1/10 yekhebula le-coaxial

• Ukuhlelwa okulula nokuguquguqukayo kwama-electro-optic modulator (ezinhlelo zezithombe zezokwelapha nezemishini)