Okwu Mmalite RF n'elu eriri Sistemu

Okwu Mmalite RF n'elu eriri Sistemu

RF karịrị eriribụ otu n'ime ngwa dị mkpa nke fotonic microwave na-egosi uru na-enweghị atụ na mpaghara dị elu dị ka microwave photonic radar, telephoto redio nke mbara igwe, na nkwurịta okwu ikuku ụgbọ ala na-enweghị onye.

RF karịrị fiberROF njikọbụ nke kachasị nke ndị na-ebugharị ngwa anya, ndị na-anata anya na eriri anya. Dị ka e gosiri na foto 1.

Ndị na-ebugharị ngwa anya: Laser nzaghachi ekesara (DFB laser) A na-etinye ya na obere mkpọtụ na ngwa dị elu dị elu, ebe a na-eji laser FP na ngwa nwere ihe dị ala. Ndị a lasers nwere ogologo wavelength nke 1310nm ma ọ bụ 1550nm.

Ihe nnata anya: N'akụkụ nke ọzọ nke njikọ fiber optic, a na-achọpụta ìhè ahụ site na PIN photodiode nke nnata, nke na-atụgharị ọkụ azụ n'ime ugbu a.

Igwe eriri anya: N'adịghị ka eriri multimode, a na-eji eriri otu ụdị eme ihe na njikọ linear n'ihi mgbasasa dị ala na obere ọnwụ. Na ogologo nke 1310nm, attenuation nke mgbaàmà anya na eriri anya bụ ihe na-erughị 0.4dB / km. Na 1550nm, ọ na-erughị 0.25dB/km.

Njikọ ROF bụ usoro nnyefe ahịrị. Dabere na njirimara nke nnyefe linear na nnyefe anya, njikọ ROF nwere uru ọrụ aka ndị a:

• Mfu dị oke ala, na ntinye eriri na-erughị 0.4 dB / km

• Ngwa anya eriri ultra-bandwidth nnyefe, ngwa anya eriri ọnwụ na-adabere na ugboro

Njikọ ahụ nwere mgbama dị elu na-ebu ikike/bandwidth, ruo DC ruo 40GHz

• Anti-electromagnetic nnyonye anya (EMI) (Enweghị mmetụta mgbaàmà na ihu igwe ọjọọ)

• Ọnụ ala dị ala kwa mita • Fiber optical na-agbanwe agbanwe ma dị fechaa, na-atụ ihe dịka 1/25 nke waveguides na 1/10 nke eriri coaxial.

• Nhazi dị mma na nke na-agbanwe agbanwe (maka sistemu onyonyo ahụike na igwe)

Dị ka ihe mejupụtara nke transmitter anya, RF n'elu eriri usoro na-ekewa n'ime abụọ ụdị: kpọmkwem modulation na mpụga modulation. Onye na-ebugharị ngwa anya nke RF na-emezigharị kpọmkwem n'elu sistemu fiber na-anabata laser DFB kpọmkwem, nke nwere uru nke ọnụ ala dị ala, obere nha na ntinye dị mfe, ma jiri ya mee ihe n'ọtụtụ ebe. Agbanyeghị, site na mgbawa laser DFB emegharịrị ozugbo, RF nke etinyere ya n'elu eriri nwere ike itinye ya na igwe ugboro n'okpuru 20GHz. E jiri ya tụnyere modulation ozugbo, mpụta modulation RF n'elu eriri anya transmitter bụ nke nwere otu ugboro ugboro DFB laser na electro-optic modulator. N'ihi ntozu oke nke teknụzụ elektrọn optic modulator, RF modulation nke mpụga n'elu sistemu eriri nwere ike nweta ngwa n'ụdị bandwit karịrị 40GHz. Otú ọ dị, n'ihi na mgbakwunye na nkeelectrooptic modulator, usoro ahụ dị mgbagwoju anya ma ghara ịkwado ngwa. Nweta njikọ ROF, ọnụ ọgụgụ mkpọtụ na oke ike bụ paramita dị mkpa nke njikọ ROF, yana enwere njikọ chiri anya n'etiti atọ ahụ. Dịka ọmụmaatụ, ọnụ ọgụgụ mkpọtụ dị ala pụtara nnukwu ike ike, ebe ọ bụghị naanị na usoro ọ bụla chọrọ uru dị elu, kamakwa ọ na-enwe mmetụta dị ukwuu na akụkụ arụmọrụ ndị ọzọ nke usoro ahụ.