Isingeniso ku-RF phezu kwe-fiber System

Isingeniso ku-RF phezu kwe-fiber System

I-RF phezu kwe-fiberingenye yezinhlelo zokusebenza ezibalulekile ze-microwave photonics futhi ikhombisa izinzuzo ezingenakuqhathaniswa emikhakheni ethuthukisiwe njenge-microwave photonic radar, i-telephoto yomsakazo wezinkanyezi, kanye nokuxhumana kwezimoto zasemoyeni ezingenamuntu.

I-RF phezu kwe-fiberIsixhumanisi se-ROFikakhulukazi yakhiwe ama-transmitter optical, abamukeli be-optical kanye nezintambo ezibonakalayo. Njengoba kuboniswe kuMfanekiso 1.

Ama-Optical Transmitters: Amalaser empendulo asabalalisiwe (I-DFB laser) zisetshenziswa ezinhlelweni zomsindo ophansi nezinamandla aphezulu, kuyilapho amalaser e-FP asetshenziswa ezinhlelweni ezinezidingo eziphansi. Lawa ma-laser anamaza amaza angu-1310nm noma angu-1550nm.

Umamukeli obonakalayo: Ngakolunye uhlangothi lwesixhumanisi se-fiber optical, ukukhanya kutholwa yi-PIN photodiode yomamukeli, okuguqula ukukhanya kubuyele kokwamanje.

Izintambo zokubona: Ngokuphambene nezintambo ze-multimode, imicu yemodi eyodwa isetshenziswa ezixhumanisini eziqondile ngenxa yokuhlakazeka okuphansi nokulahlekelwa okuphansi. Kubude begagasi obungu-1310nm, ukuncishiswa kwesignali ye-optical ku-fiber optical kungaphansi kuka-0.4dB/km. Ku-1550nm, ingaphansi kuka-0.25dB/km.

Isixhumanisi se-ROF siwuhlelo lokudlulisela oluqondile. Ngokusekelwe ezicini zokudluliswa komugqa kanye nokudluliswa kwe-optical, isixhumanisi se-ROF sinezinzuzo ezilandelayo zobuchwepheshe:

• Ukulahlekelwa okuphansi kakhulu, nokuncishiswa kwefayibha ngaphansi kuka-0.4 dB/km

• Ukudluliswa kwe-fiber optical ultra-bandwidth, ukulahleka kwefiber optical kuncike kumafrikhwensi

Isixhumanisi sinomthamo wesiginali ephezulu/umkhawulokudonsa, ofika ku-DC kuye ku-40GHz

• I-Anti-electromagnetic interference (EMI) (Awukho umthelela wesignali esimweni sezulu esibi)

• Izindleko eziphansi imitha ngayinye • Ama-Optical fibers avumelana nezimo futhi angasindi, anesisindo esicishe sibe ngu-1/25 wamagagasi amagagasi kanye no-1/10 wezintambo ezingama-coaxial

• Isakhiwo esivumelanayo nesiguquguqukayo (kumasistimu ezithombe zezokwelapha nemishini)

Ngokusho kokwakheka kwesidluliseli esibonakalayo, i-RF over fiber system ihlukaniswe yaba izinhlobo ezimbili: ukuguquguquka okuqondile kanye nokuguquguquka kwangaphandle. I-optical transmitter ye-direct-modulated RF phezu kwe-fiber system yamukela i-laser ye-DFB ehlelwe ngokuqondile, enezinzuzo zezindleko eziphansi, usayizi omncane nokuhlanganiswa okulula, futhi isisetshenziswe kabanzi. Kodwa-ke, kunqunyelwe i-chip ye-laser ye-DFB ehlelwe ngokuqondile, i-RF elungiselelwe ngokuqondile phezu kwefayibha ingasetshenziswa kuphela kubhendi yefrikhwensi engaphansi kuka-20GHz. Uma kuqhathaniswa nokuguquguquka okuqondile, imodulation yangaphandle ye-RF phezu kwe-fiber optical transmitter yakhiwe ngelaser ye-DFB enefrikhwensi eyodwa kanye nemoduli ye-electro-optic. Ngenxa yokuvuthwa kobuchwepheshe bemoduli ye-electro-optic, i-RF yokumodula yangaphandle phezu kwesistimu yefayibha ingafinyelela izinhlelo zokusebenza kubhendi yefrikhwensi enkulu kuno-40GHz. Nokho, ngenxa yokwengezwa kwe-i-electro-optic module, isistimu iyinkimbinkimbi kakhulu futhi ayihambisani nesicelo. Inzuzo yesixhumanisi se-ROF, isibalo somsindo nobubanzi obuguquguqukayo yimingcele ebalulekile yezixhumanisi ze-ROF, futhi kukhona ukuxhumana okuseduze phakathi kokuthathu. Isibonelo, isibalo somsindo ophansi sisho ububanzi obukhulu obuguquguqukayo, kuyilapho ukuzuza okuphezulu kungadingeki kuphela isistimu ngayinye, kodwa futhi kunomthelela omkhulu kwezinye izici zokusebenza zesistimu.