Nhanganyaya yekushandiswa kweRF optical transmission RF pamusoro peFiber

Nhanganyaya yekushandiswa kweRF optical transmissionRF pamusoro peFiber

Mumakumi emakore achangopfuura, tekinoroji yekukurukurirana ne microwave uye optical telecommunications yakabudirira nekukurumidza. Matekinoroji ese ari maviri akafambira mberi zvikuru muminda yawo, uye akatungamirawo mukuvandudzwa nekukurumidza kwekutaurirana nefoni uye masevhisi ekutumira data, zvichiunza nyore kuhupenyu hwevanhu. Matekinoroji maviri aya ekutaurirana ne microwave ne photoelectric communication ane zvakanakira zvawo, asi anewo zvimwe zvaasingakwanise kukunda. Kutumirwa kwe photoelectric kunoda networking chaiyo, uye kune zvimwe zvisizvo mukuchinjika, networking nekukurumidza uye kufamba kwekuvaka. Kutaurirana ne microwave kune zvimwe zvisizvo mukutumira kure uye kugona kukuru, uye microwave inoda kuwedzera relay uye kudzokororwa, uye bandwidth yekutumira inogumira ne carrier frequency. Izvi zvakaita kuti microwave ne optical Fiber transmission technology zvibatanidzwe, ndiko kuti, Radio over Fiber (ROF) technology, iyo inowanzonziRF pamusoro peFiber, kana tekinoroji yeredhiyo frequency remote. Nzvimbo inonyanya kushandiswa yeRF pamusoro peFiber tekinoroji inzvimbo yekutaurirana kwe optical fiber, kusanganisira zviteshi zve mobile base, distributed systems, wireless broadband, cable TV, private network communications nezvimwewo. Mumakore achangopfuura, nekuwedzera kwe microwave photonics, RF pamusoro peFiber tekinoroji yakashandiswa zvakanyanya mu microwave photon radar, UAV communication, astronomy research nedzimwe nzvimbo. Zvichienderana nemhando dzakasiyana dze laser modulation, laser communication inogona kukamurwa kuita internal modulation ne external modulation, iyo inonyanya kushandiswa ndeye external modulation, uye RF pamusoro peFiber yakavakirwa pa external laser modulation inotsanangurwa mupepa rino. RF pamusoro peFiber links inonyanya kuumbwa ne optical transceiver, transmission, uyeROF zvinongedzo, sezvinoratidzwa mumufananidzo unotevera:

Sumo pfupi yechikamu chechiedza. LD inowanzoshandiswaMalaser eDFB(rudzi rwemhinduro dzakagoverwa), dzinoshandiswa pakushandisa ruzha rushoma, mashandisirwo emhando yepamusoro, uye malaser eFP (rudzi rweFabry-Perot) anoshandiswa pakushandisa kushoma. Mawavelength anonyanya kushandiswa i1064nm ne1550nm. Iyo PD imhando yemudziyo wekuona foto, uye kune rimwe divi re fiber optic link, chiedza chinoonekwa nePIN photodiode yemugamuchiri, iyo inoshandura chiedza kuita chiratidzo chemagetsi uye yozopinda mudanho rekugadzirisa magetsi rinozivikanwa. Fiber ye optical inoshandiswa pakubatanidza pakati inowanzova single-mode uye multi-mode optical fiber. Fiber ye single-mode inowanzo shandiswa mu backbone network nekuda kwekupararira kwayo kwakaderera uye kurasikirwa kwakaderera. Multimode fiber ine mashandiro akati wandei mu network yemunharaunda nekuti yakachipa kugadzira uye inogona kugamuchira ma transmissions akawanda panguva imwe chete. Kudzikira kwechiratidzo che optical mu fiber kudiki kwazvo, chete ~0.25dB/km pa1550nm.

Zvichienderana nehunhu hwekutumira kwemutsetse uye kutumira kwemaziso, ROF links dzine zvakanakira zvehunyanzvi zvinotevera:

• Kurasikirwa kwakaderera zvikuru, kuderera kwefiber kuri pasi pe 0.4 dB/km

• Kutapurirana kwefiber ultra-bandwidth, kurasikirwa kwefiber kusingatarisirwi nefrequency

• Kubatana nehukuru hwekutakura masaini/bandwidth kusvika ku110GHz • Kusapindirana kweElectromagnetic (EMI) (mamiriro ekunze asina kunaka haakanganisi masaini)

• Mutengo wakaderera pamita imwe neimwe • Fiber inochinjika uye yakareruka, ichirema chikamu chimwe chete pamakumi maviri nemashanu chewaveguide uye chikamu chimwe chete pagumi chetambo ye coaxial.

• Kurongeka kuri nyore uye kunochinjika kwemamodulator emagetsi (ekurapa uye masisitimu emifananidzo yemakanika)