Intangiriro ku ikoreshwa rya RF optique transmission RF hejuru ya Fiber

Intangiriro ku ishyirwa mu bikorwa ryaKohereza amakuru ya RF ku buryo bw'ikoranabuhangaRF hejuru ya Fibre

Mu myaka ya vuba aha, itumanaho rya mikoroonde n'ikoranabuhanga ry'itumanaho rya optique byateye imbere cyane. Ikoranabuhanga ryombi ryateye imbere cyane mu nzego zaryo, ndetse ryanatumye habaho iterambere ryihuse rya serivisi z'itumanaho rya telefoni zigendanwa no kohereza amakuru, bitanga uburyo bworohereza ubuzima bw'abantu. Ikoranabuhanga ryombi rya mikoroonde n'itumanaho rya fotoelectric rifite ibyiza byaryo, ariko rifite n'ibibi bimwe na bimwe bitashoboka gutsindwa. Kohereza fotoelectric bisaba kohereza ikoranabuhanga, kandi hari ibibazo bimwe na bimwe mu koroshya, kohereza itumanaho ryihuse no kugenda mu bwubatsi. Itumanaho rya mikoroonde rifite ibibazo bimwe na bimwe mu kohereza itumanaho kure n'ubushobozi bunini, kandi mikoroonde ikenera kongera kohereza no kongera kohereza, kandi uburyo bwo kohereza itumanaho bugengwa n'umuvuduko w'imashini. Ibi byatumye habaho guhuza ikoranabuhanga rya mikoroonde na optique fibre, ni ukuvuga ikoranabuhanga rya radiyo ikoresha fibre (ROF), rikunze kwitwaRF hejuru ya Fibre, cyangwa ikoranabuhanga rya kure rya radiyo. Urwego rukoreshwa cyane mu ikoranabuhanga rya RF kuri Fiber ni urwego rw'itumanaho rya fibre optique, harimo sitasiyo zigendanwa, sisitemu zikwirakwizwa, interineti idafite umugozi, televiziyo ya cable, itumanaho ryigenga n'ibindi. Mu myaka ya vuba aha, bitewe n'ubwiyongere bwa microwave photonics, ikoranabuhanga rya RF kuri Fiber ryakoreshejwe cyane muri microwave photon radar, itumanaho rya UAV, ubushakashatsi ku isanzure ry'ikirere n'ahandi. Dukurikije ubwoko butandukanye bwa laser modulation, itumanaho rya laser rishobora kugabanywamo modulation y'imbere n'iy'inyuma, ikoreshwa cyane ni external modulation, naho RF kuri Fiber ishingiye kuri external laser modulation isobanurwa muri iyi nyandiko. RF kuri Fiber links zigizwe ahanini na transceiver y'urumuri, transmission, naAmasano ya ROF, nk'uko bigaragara ku ishusho ikurikira:

Incamake y'igice cy'urumuri. LD ikunze gukoreshwaLazeri za DFB(ubwoko bw'ibitekerezo bikwirakwizwa), bikoreshwa mu gusakuza guke, gukoresha ahantu hakomeye, na lazeri za FP (ubwoko bwa Fabry-Perot) zikoreshwa mu gusakuza guke. Ubunini bw'umuraba bukoreshwa cyane ni 1064nm na 1550nm. PD niicyuma gipima foto, kandi ku rundi ruhande rw'umurongo wa fiber optique, urumuri ruboneka hakoreshejwe PIN photodiode y'icyuma gifata urumuri, gihindura urumuri mo ikimenyetso cy'amashanyarazi hanyuma kikajya mu ntambwe isanzwe yo gutunganya amashanyarazi. Fibre optique ikoreshwa mu guhuza hagati ikunze kuba fibre optique imwe na fibre optique nyinshi. Fibre optique imwe ikunze gukoreshwa mu muyoboro w'inyuma kubera ko ikwirakwira cyane kandi itakaza bike. Fibre multimode ifite akamaro runaka mu muyoboro w'aho iherereye kuko ihendutse kuyikora kandi ishobora kwakira transmissions nyinshi icyarimwe. Kugabanuka k'ikimenyetso optique muri fibre ni gato cyane, ni ~ 0.25dB/km kuri 1550nm.

Hashingiwe ku miterere y'uburyo bwo kohereza amakuru bukoresha umurongo umwe n'uburyo bwo kohereza amakuru hakoreshejwe optique, ROF links zifite inyungu zikurikira mu bya tekiniki:

• Igihombo gito cyane, kugabanuka kwa fibre biri munsi ya 0.4 dB/km

• Kohereza fibre ultra-bandwidth, gutakaza fibre hatagendewe ku nshuro

• Ihuza n'ubushobozi bwo gutwara ibimenyetso/bandwidth iri hejuru kugeza kuri 110GHz • Ubudahangarwa bw'amashanyarazi (EMI) (ikirere kibi ntikigira ingaruka ku kimenyetso)

• Igiciro gito kuri metero imwe • Fibre iraryoha kandi yoroheje, ipima hafi 1/25 cy'umurongo w'amazi n'igice cya 10 cy'insinga ya coaxial

• Gutunganya byoroshye kandi byoroshye ibikoresho bya electro-optic modulator (ku bijyanye n'ubuvuzi n'ikoranabuhanga)