Isingeniso sokusetshenziswa kwe-RF optical transmission RF over Fiber

Isingeniso sokusetshenziswa kweUkudluliswa kwe-RF opticalI-RF phezu kwe-Fiber

Emashumini eminyaka amuva nje, ukuxhumana nge-microwave kanye nobuchwepheshe bezokuxhumana ngocingo buthuthuke ngokushesha. Bobabili ubuchwepheshe buye benza inqubekelaphambili enkulu emikhakheni yabo, futhi buholele ekuthuthukisweni okusheshayo kwezokuxhumana ngomakhalekhukhwini kanye nezinsizakalo zokudluliswa kwedatha, okuletha ukunethezeka okukhulu ezimpilweni zabantu. Ubuchwepheshe obubili bokuxhumana nge-microwave kanye nokuxhumana ngesithombe kagesi kunezinzuzo zabo, kodwa futhi banezinye izinto ezimbi ezingenakunqotshwa. Ukudluliswa kwe-Photoelectric kudinga ukuxhumana ngokomzimba, futhi kukhona ukushiyeka ekuguquguqukeni, ukuxhumana okusheshayo nokuhamba kokwakhiwa. Ukuxhumana kwe-Microwave kunokushiyeka okuthile ekudluliselweni kwebanga elide namandla amakhulu, futhi i-microwave idinga ukukhuliswa kokudlulisela okuphindaphindiwe kanye nokudluliswa kabusha, futhi umkhawulokudonsa wokudlulisela unqunyelwe imvamisa yenkampani yenethiwekhi. Lokhu kwaholela ekuhlanganisweni kobuchwepheshe bokudlulisa i-microwave ne-optical Fiber, okungukuthi, ubuchwepheshe beRadio over Fiber(ROF), obuvame ukubizwa ngabo ngokuthi.I-RF phezu kwe-Fiber, noma ubuchwepheshe obukude bomsakazo. Inkambu esetshenziswa kakhulu ye-RF phezu kobuchwepheshe be-Fiber iyinkambu yokuxhumana nge-fiber optical, okuhlanganisa iziteshi eziyisisekelo zamaselula, izinhlelo ezisabalalisiwe, i-wireless broadband, i-cable TV, ukuxhumana kwenethiwekhi yangasese nokunye. Eminyakeni yamuva nje, ngokukhuphuka kwama-microwave photonics, ubuchwepheshe be-RF phezu kwe-Fiber buye basetshenziswa kakhulu ku-microwave photon radar, ukuxhumana kwe-UAV, ucwaningo lwezinkanyezi kanye neminye imikhakha. Ngokwezinhlobo ezahlukene zokuguquguquka kwe-laser, ukuxhumana kwe-laser kungahlukaniswa kube ukuguquguquka kwe-laser kwangaphakathi nokuguquguquka kwangaphandle, okuvame ukusetshenziswa ukuguquguquka kwangaphandle, kanti i-RF over Fiber esekelwe ekushintshashintsheni kwe-laser kwangaphandle kuchazwe kuleli phepha. Izixhumanisi ze-RF phezu kwe-Fiber zakhiwe ikakhulukazi i-optical transceiver, transmission, kanyeIzixhumanisi ze-ROF, njengoba kuboniswe emfanekisweni olandelayo:

Isingeniso esifushane sengxenye yokukhanya. I-LD isetshenziswa kakhuluDFB lasers(uhlobo lwempendulo esabalalisiwe), ezisetshenziselwa umsindo ophansi, izinhlelo zokusebenza zebanga eliguqukayo eliphezulu, namalaser e-FP(Fabry-Perot) asetshenziselwa izinhlelo zokusebenza ezingafuneki kangako. Amaza amaza asetshenziswa kakhulu yi-1064nm kanye ne-1550nm. I-PD ii-photodetector, futhi ngakolunye uhlangothi lwesixhumanisi se-fiber optic, ukukhanya kutholwa yi-PIN photodiode yomamukeli, eguqula ukukhanya kube isignali kagesi bese kuba isinyathelo esijwayelekile sokucubungula ugesi. I-fiber optical esetshenziselwa ukuxhumana okumaphakathi ivamise ukuba yimodi eyodwa kanye ne-multi-mode optical fiber. I-fiber yemodi eyodwa ijwayele ukusetshenziswa kunethiwekhi yomgogodla ngenxa yokuhlakazeka kwayo okuphansi nokulahlekelwa okuphansi. I-Multimode fiber inohlelo oluthile kunethiwekhi yendawo ngenxa yokuthi ishibhile ukuyikhiqiza futhi ingamukela ukuthunyelwa okuningi ngesikhathi esisodwa. Ukuncishiswa kwesiginali ye-optical kufiber kuncane kakhulu, kuphela ~0.25dB/km ku-1550nm.

Ngokusekelwe ezicini zokudluliswa komugqa kanye nokudluliswa kwe-optical, izixhumanisi ze-ROF zinezinzuzo ezilandelayo zobuchwepheshe:

• Ukulahlekelwa okuphansi kakhulu, i-fiber attenuation ngaphansi kuka-0.4 dB/km

• Ukudluliswa kwe-Fiber ultra-bandwidth, ukulahleka kwefayibha okunganciki kumafrikhwensi

• Isixhumanisi esinamandla okuphatha isiginali ephezulu/umkhawulokudonsa ofika ku-110GHz• Ukumelana ne-Electromagnetic Interference (EMI) (isimo sezulu esingesihle asiphazamisi isignali)

• Izindleko eziphansi imitha ngayinye • I-Fiber ivumelana nezimo kakhulu futhi ilula, inesisindo esingaba ngu-1/25 we-waveguide kanye no-1/10 wekhebula le-coaxial

• Ukuhlelwa okulula nokuguquguqukayo kwama-modulators e-electro-optic (amasistimu eimaging wezokwelapha nemishini)