Kenyelletso ea RF holim'a fiber System

Kenyelletso ea RF holim'a fiber System

RF holim'a fiberke e 'ngoe ea litšebeliso tsa bohlokoa tsa microwave photonics 'me e bontša melemo e ke keng ea lekanngoa mafapheng a tsoetseng pele a kang microwave photonic radar, astronomical radio telephoto, le puisano e sa sebetsoeng ea likoloi tsa sefofane.

RF ka holim'a fiberKhokahano ea ROFhaholo-holo e entsoe ka li-transmitters tsa optical, li-receiver tsa optical le lithapo tsa optical. Joalokaha ho bontšitsoe setšoantšong sa 1.

Li-transmitters tsa optical: Li-lasers tsa maikutlo tse ajoang (DFB laser) li sebelisoa lits'ebetsong tse nang le lerata le tlase le matla a phahameng, ha li-laser tsa FP li sebelisoa lits'ebetsong tse nang le litlhoko tse tlase. Li-laser tsena li na le maqhubu a bolelele ba 1310nm kapa 1550nm.

Moamoheli oa Optical: Ka lehlakoreng le leng la sehokelo sa fiber optical, leseli le bonoa ke PIN photodiode ea moamoheli, e fetolang leseli ho khutlela hona joale.

Lithapo tsa optical: Ho fapana le likhoele tsa multimode, likhoele tsa mofuta o le mong li sebelisoa lihokelong tsa mela ka lebaka la ho hasana ha tsona le tahlehelo e tlase. Ka bolelele ba 1310nm, ho fokotsoa ha lets'oao la optical fiber ea optical e ka tlase ho 0.4dB/km. Ho 1550nm, e ka tlase ho 0.25dB/km.

Sehokelo sa ROF ke sistimi ea phetisetso ea mohala. Ho ipapisitsoe le litšoaneleho tsa phetisetso ea mohala le phetiso ea optical, sehokelo sa ROF se na le melemo e latelang ea tekheniki:

• Tahlehelo e tlase haholo, e nang le fiber attenuation e ka tlase ho 0.4 dB/km

• Phetiso ea fiber ea ultra-bandwidth, tahlehelo ea fiber ea optical e itšetlehile ka makhetlo a mangata

Sehokelo se na le matla a holimo a ho jara / bandwidth, ho fihla ho DC ho isa ho 40GHz

• Anti-electromagnetic interference (EMI) (Ha ho lets'oao le amang boemo ba leholimo bo bobe)

• Theko e tlase ho mithara • Lithapo tsa Optical li tenyetseha le ho ba bobebe, li boima ba hoo e ka bang 1/25 ea waveguides le 1/10 ea likhoele tsa coaxial.

• Ponahalo e bonolo le e tenyetsehang (bakeng sa litsamaiso tsa litšoantšo tsa bongaka le tsa mochini)

Ho latela sebopeho sa transmitter ea optical, RF over fiber system e arotsoe ka mefuta e 'meli: modulation e tobileng le modulation ea kantle. Transmitter ea optical ea RF e fetotsoeng ka kotloloho holim'a fiber system e amohela laser ea DFB e fetotsoeng ka kotloloho, e nang le melemo ea litšenyehelo tse tlase, boholo bo nyane le ho hokahana habonolo, 'me e se e sebelisoa haholo. Leha ho le joalo, e lekanyelitsoe ke chip ea laser ea DFB e fetotsoeng ka kotloloho, RF e fetotsoeng ka kotloloho holim'a fiber e ka sebelisoa feela sehlopheng sa frequency se ka tlase ho 20GHz. Ha ho bapisoa le ho feto-fetoha ha molumo ka kotloloho, modulation ea kantle ea RF holim'a fiber optical transmitter e entsoe ka laser ea DFB e nang le maqhubu a le mong le modulator ea electro-optic. Ka lebaka la kholo ea theknoloji ea electro-optic modulator, modulation ea kantle ea RF over fiber system e ka fihlela lits'ebetso ho frequency band e fetang 40GHz. Leha ho le joalo, ka lebaka la tlatsetso eamochine oa motlakase oa motlakase, tsamaiso e rarahane haholoanyane 'me ha e lumellane le kopo. Phaello ea khokahanyo ea ROF, palo ea lerata le mefuta e fapaneng ea matla ke likarolo tsa bohlokoa tsa lihokelo tsa ROF, 'me ho na le khokahano e haufi har'a tse tharo. Ka mohlala, palo e tlaase ea lerata e bolela mefuta e mengata e matla, ha phaello e phahameng e sa hlokehe feela ke tsamaiso e 'ngoe le e' ngoe, empa hape e na le tšusumetso e kholo likarolong tse ling tsa ts'ebetso ea tsamaiso.