Nhanganyaya kuRF pamusoro pefiber System

Nhanganyaya kuRF pamusoro pefiber System

RF pamusoro pefaibhandeimwe yemabasa akakosha e microwave photonics uye inoratidza mabhenefiti asina muganho muminda yepamusoro senge microwave photonic radar, astronomical radio telephoto, uye unmanned aircraft vehicle communication.

Iyo RF pamusoro pefayibhaChinongedzo cheROFinonyanya kuumbwa nema transmitters e optical, ma optical receiver uye tambo dze optical. Sezvakaratidzwa muMufananidzo 1.

Matransmita eOptical: Malaser emhinduro akaparadzirwa (Laser yeDFB) dzinoshandiswa mukushandiswa kweruzha rushoma uye munzvimbo dzine simba guru, nepo maFP laser achishandiswa mukushandiswa kune zvinodiwa zvishoma. MaLaser aya ane mawavelength e1310nm kana 1550nm.

Chinogamuchira chiedza: Kune rimwe divi rechinobatanidza chefiber, chiedza chinoonekwa nePIN photodiode yemugamuchiri, iyo inoshandura chiedza kuita magetsi.

Tambo dzeOptical: Kusiyana nefibers dzemultimode, fibers dzemode imwe chete dzinoshandiswa mu linear links nekuda kwekupararira kwadzo kushoma uye kurasikirwa kwadzo kushoma. Pa wavelength ye1310nm, attenuation ye optical signal mu optical fiber isingasviki 0.4dB/km. Pa1550nm, isingasviki 0.25dB/km.

Chinongedzo cheROF sisitimu yekutumira yakatsetseka. Zvichienderana nehunhu hwekutumira yakatsetseka uye kutumira kwemaziso, chinongedzo cheROF chine zvakanakira zvehunyanzvi zvinotevera:

• Kurasikirwa kwakaderera zvakanyanya, nekuderedza fiber pasi pe0.4 dB/km

• Kutapurirana kweOptical fiber ultra-bandwidth, kurasikirwa kweoptical fiber hakunei nehuwandu hwenguva

Chinongedzo ichi chine simba rekutakura masaini/bandwidth yakakwira, kusvika kuDC kusvika ku40GHz

• Kupindira kwemagetsi (EMI) (Hapana kukanganiswa kwechiratidzo mumamiriro ekunze akaipa)

• Mutengo wakaderera pamita imwe neimwe • Mafiber emagetsi anochinjika uye akareruka, achirema chikamu chimwe chete pamakumi maviri nemashanu chemawaveguides uye chikamu chimwe chete pagumi chetambo dzecoaxial.

• Marongerwo ari nyore uye anochinjika (ezvirongwa zvekurapa uye zvemakanika)

Zvichienderana nekuumbwa kweoptical transmitter, RF over fiber system yakakamurwa kuita mhando mbiri: direct modulation uye external modulation. Optical transmitter ye direct-modulated RF over fiber system inoshandisa direct-modulated DFB laser, ine mabhenefiti emutengo wakaderera, saizi diki uye nyore kubatanidzwa, uye yakashandiswa zvakanyanya. Zvisinei, ichiganhurirwa ne direct-modulated DFB laser chip, direct-modulated RF over fiber inogona kushandiswa chete mu frequency band iri pasi pe 20GHz. Zvichienzaniswa ne direct modulation, external modulation RF over fiber optical transmitter inoumbwa ne single-frequency DFB laser uye electro-optic modulator. Nekuda kwekukura kwetekinoroji ye electro-optic modulator, external modulation RF over fiber system inogona kuita mashandisirwo mu frequency band inopfuura 40GHz. Zvisinei, nekuda kwekuwedzera kwemodulator yemagetsi-optic, sisitimu yacho yakaoma uye haibatsiri kushandiswa. Kuwana kweROF link, noise figure uye dynamic range zvinhu zvakakosha paROF links, uye pane kubatana kwakasimba pakati pezvinhu zvitatu. Semuenzaniso, low noise figure zvinoreva dynamic range yakakura, nepo high gain isingangodiwi chete nesystem yega yega, asiwo ine simba guru pane zvimwe zvinhu zvesystem.