Selelekela sa ts'ebeliso eaPhetiso ea RF ea mahloRF holim'a Faeba
Lilemong tse mashome tsa morao tjena, puisano ea microwave le theknoloji ea puisano ea optical li ntlafalitse ka potlako. Mahlale ka bobeli a entse tsoelo-pele e kholo masimong a 'ona, 'me a boetse a lebisitse nts'etsopele e potlakileng ea puisano ea mehala le lits'ebeletso tsa phetisetso ea data, e leng se tlisang boiketlo bo boholo maphelong a batho. Mahlale ana a mabeli a puisano ea microwave le puisano ea photoelectric a na le melemo ea 'ona, empa a boetse a na le mathata a mang a ke keng a hlōloa. Phetisetso ea photoelectric e hloka marang-rang a 'mele, 'me ho na le mefokolo e meng ea ho tenyetseha, marang-rang a potlakileng le ho tsamaea ha kaho. Puisano ea microwave e na le mefokolo e meng ea phetisetso ea sebaka se selelele le bokhoni bo boholo, 'me microwave e hloka ho atolosoa khafetsa ha relay le phetisetso hape, 'me bandwidth ea phetisetso e lekanyelitsoe ke maqhubu a carrier. Sena se lebisitse ho kopanngoa ha theknoloji ea phetisetso ea microwave le optical Fiber, ke hore, theknoloji ea Radio over Fiber (ROF), eo hangata e bitsoangRF holim'a Faeba, kapa theknoloji ea hole ea maqhubu a seea-le-moea. Tšimo e sebelisoang haholo ea theknoloji ea RF holim'a Fiber ke tšimo ea puisano ea faeba ea optical, ho kenyeletsoa liteishene tsa mehala ea thekeng, litsamaiso tse ajoang, broadband e se nang mohala, TV ea cable, puisano ea marang-rang a poraefete le tse ling. Lilemong tsa morao tjena, ka ho phahama ha li-photonics tsa microwave, theknoloji ea RF holim'a Fiber e 'nile ea sebelisoa haholo ho radar ea photon ea microwave, puisano ea UAV, lipatlisiso tsa bolepi ba linaleli le masimo a mang. Ho ea ka mefuta e fapaneng ea modulation ea laser, puisano ea laser e ka aroloa ka modulation ea kahare le modulation ea kantle, e sebelisoang hangata ke modulation ea kantle, 'me RF holim'a Fiber e thehiloeng modulation ea laser ea kantle e hlalositsoe pampiring ena. Lihokelo tsa RF holim'a Fiber li entsoe haholo ka transceiver ea optical, phetisetso, leLihokelo tsa ROF, joalo ka ha ho bontšitsoe setšoantšong se latelang:
Selelekela se sekgutshwane sa karolo ya lesedi. LD e sebediswa hangataLi-laser tsa DFB(mofuta oa karabelo e ajoang), tse sebelisetsoang lerata le tlase, lits'ebetso tsa maqhubu a phahameng, le li-laser tsa FP (mofuta oa Fabry-Perot) li sebelisoa bakeng sa lits'ebetso tse sa hlokeng boiteko bo bongata. Maqhubu a maqhubu a sebelisoang haholo ke 1064nm le 1550nm. PD kesesebelisoa sa ho lemoha foto, 'me pheletsong e 'ngoe ea khokahano ea fiber optic, leseli le bonoa ke PIN photodiode ea moamoheli, e fetolang leseli hore e be lets'oao la motlakase ebe e ea mohatong o tloaelehileng oa ts'ebetso ea motlakase. Faeba ea optical e sebelisoang bakeng sa khokahano e mahareng hangata ke faeba ea optical ea mode e le 'ngoe le ea mode e mengata. Faeba ea mode e le 'ngoe e sebelisoa hangata marangrang a mokokotlo ka lebaka la ho hasana ha eona ho tlase le tahlehelo e tlase. Faeba ea mode e ngata e na le ts'ebeliso e itseng marangrang a sebaka sa lehae hobane e theko e tlase ho e etsa 'me e ka amohela li-transmission tse ngata ka nako e le' ngoe. Ho fokotseha ha lets'oao la optical ka har'a fiber ho nyane haholo, ke ~0.25dB/km feela ho 1550nm.
Ho latela litšobotsi tsa phetiso e otlolohileng le phetiso ea optical, lihokelo tsa ROF li na le melemo e latelang ea tekheniki:
• Tahlehelo e tlase haholo, ho fokotseha ha faeba ho ka tlase ho 0.4 dB/km
• Phetiso ea ultra-bandwidth ea faeba, tahlehelo ea faeba ho sa tsotelehe maqhubu
• Kgokelo e nang le bokgoni bo phahameng ba ho jara matshwao/bandwidth ho fihlela ho 110GHz • Khanyetso ya Electromagnetic Interference (EMI) (boemo ba lehodimo bo bobe ha bo ame matshwao)
• Litšenyehelo tse tlase ka mithara • Faeba e tenyetseha haholoanyane ebile e bobebe, e boima ba hoo e ka bang 1/25 ea waveguide le 1/10 ea thapo ea coaxial
• Tokisetso e bonolo le e tenyetsehang ea li-electro-optic modulator (bakeng sa litsamaiso tsa litšoantšo tsa bongaka le tsa mechini)
Nako ea poso: Hlakubele-11-2025