Intshayelelo kwiRF phezu kweFiber System

Intshayelelo kwiRF phezu kweFiber System

RF phezu kwefayibhasesinye sezicelo ezibalulekileyo zeefotonic zemicrowave kwaye ibonisa iingenelo ezingenakuthelekiswa nanto kwiinkalo eziphambili ezifana ne-microwave photonic radar, i-astronomical radio telephoto, kunye nonxibelelwano lwenqwelo-moya olungenamntu.

I-RF phezu kwefayibhaIkhonkco le-ROFubukhulu becala iqulunqwe ziitransmitha zamehlo, abamkeli bamehlo kunye neentambo zamehlo. Njengoko kubonisiwe kuMfanekiso 1.

Abathumeli be-Optical: Ii-laser zengxelo ezisasazwe (DFB laser) zisetyenziselwa kwizicelo eziphantsi kwengxolo kunye ne-high-dynamic range, ngelixa ii-laser ze-FP zisetyenziselwa izicelo ezineemfuno eziphantsi. Ezi lasers zinobude obuyi-1310nm okanye 1550nm.

I-Optical receiver: Kwelinye icala lekhonkco le-fiber optical, ukukhanya kuchongwa yi-PIN photodiode yomamkeli, eguqula ukukhanya kwakhona kube ngoku.

Iintambo ze-Optical: Ngokuchasene ne-multimode fibers, iifayili ze-single-mode zisetyenziswa kwiikhonkco ezinqamlekileyo ngenxa yokusabalalisa okuphantsi kunye nokulahleka okuphantsi. Kwi-wavelength ye-1310nm, ukunyanzeliswa kwesignali ye-optical kwi-fiber optical ingaphantsi kwe-0.4dB / km. Kwi-1550nm, ingaphantsi kwe-0.25dB/km.

Ikhonkco ye-ROF yinkqubo yothumelo yomgca. Ngokusekwe kwiimpawu zothumelo lomgca kunye nokuhanjiswa kwe-optical, ikhonkco ye-ROF ineenzuzo zobuchwepheshe zilandelayo:

• Ilahleko ephantsi kakhulu, kunye nefiber attenuation engaphantsi kwe-0.4 dB/km

• Ifayibha ye-Optical transmission ye-ultra-bandwidth, ilahleko yefiber optical ixhomekeke kumaza

Ikhonkco linomthamo ophezulu wokuthwala umthamo / i-bandwidth, ukuya kuthi ga kwi-DC ukuya kwi-40GHz

• Uphazamiseko lwe-Anti-electromagnetic (EMI) (Akukho mpembelelo yomqondiso kwimozulu embi)

• Ixabiso eliphantsi ngemitha nganye • Iintsinga zamehlo zibhetyebhetye kwaye zikhaphukhaphu, zinobunzima obumalunga ne-1/25 ye-waveguides kunye ne-1/10 yeentambo ze-coaxial

• Uyilo olufanelekileyo noluguquguqukayo (lweesistim zonyango nezoomatshini bokucinga)

Ngokokwakheka kwe-optical transmitter, inkqubo ye-RF ngaphezulu kwefayibha yahlulwe yazintlobo ezimbini: ukumodareyitha ngokuthe ngqo kunye nokumodareyitha kwangaphandle. Isixhobo sokuhambisa i-optical transmitter ye-RF emodulisiweyo ngokuthe ngqo ngaphezulu kwe-fiber system yamkela i-laser ye-DFB emoduliweyo ngokuthe ngqo, enezibonelelo zexabiso eliphantsi, ubungakanani obuncinci kunye nokudityaniswa lula, kwaye isetyenziswe ngokubanzi. Nangona kunjalo, umda we-laser chip ye-DFB emodareyithiwe ngokuthe ngqo, i-RF emodulisiweyo ngokuthe ngqo phezu kwefayibha inokufakwa kuphela kwibhendi yamaza angaphantsi kwe-20GHz. Xa kuthelekiswa nokumodareyitha okuthe ngqo, imodyuli yangaphandle yeRF phezu kwefayibha yokuhambisa ifayibha yenziwe ngelaser ye-DFB enefrikhwensi enye kunye nemodyuli ye-electro-optic. Ngenxa yokukhula kobuchwephesha bemodyuli ye-electro-optic, imodyuli yangaphandle yeRF phezu kwefiber system inokuphumeza usetyenziso kwibhendi yefrikhwensi enkulu kune-40GHz. Nangona kunjalo, ngenxa yokongezwa kweimodyuli ye-electro-optic, inkqubo inzima kakhulu kwaye ayihambisani nesicelo. Inzuzo yekhonkco ye-ROF, umzobo wengxolo kunye noluhlu oluguquguqukayo luyiparameters ebalulekileyo ye-ROF links, kwaye kukho uxhulumaniso olusondeleyo phakathi kwezi zintathu. Ngokomzekelo, umzobo ophantsi wengxolo uthetha uluhlu olukhulu oluguquguqukayo, ngelixa inzuzo ephezulu ayifunwa kuphela yinkqubo nganye, kodwa inempembelelo enkulu kwezinye iinkalo zokusebenza kwenkqubo.