Gabatarwa ga aikace-aikacen watsa RF na gani ta RF akan Fiber

Gabatarwa ga aikace-aikacenRF na gani watsawaRF akan Fiber

A cikin 'yan shekarun nan, fasahar sadarwa ta microwave da fasahar sadarwa ta gani sun bunƙasa cikin sauri. Dukansu fasahohin sun sami ci gaba mai girma a fannoni daban-daban, kuma sun haifar da ci gaban sadarwa ta wayar hannu da ayyukan watsa bayanai cikin sauri, wanda hakan ya kawo sauƙin rayuwa ga mutane. Fasaha biyu ta sadarwa ta microwave da sadarwa ta photoelectric suna da nasu fa'idodi, amma suna da wasu rashin amfani waɗanda ba za a iya shawo kansu ba. Watsa hotuna ta photoelectric yana buƙatar hanyar sadarwa ta zahiri, kuma akwai wasu gazawa a cikin sassauci, hanyar sadarwa mai sauri da motsi na gini. Sadarwa ta microwave tana da wasu gazawa a watsawa ta nesa da babban ƙarfin aiki, kuma microwave yana buƙatar ƙara yawan relay da sake watsawa, kuma bandwidth ɗin watsawa yana iyakance ta hanyar mitar mai ɗaukar hoto. Wannan ya haifar da haɗakar microwave da fasahar watsawa ta fiber optical, wato, fasahar Radio over Fiber (ROF), wacce galibi ake kira daRF akan Fiber, ko fasahar nesa ta mitar rediyo. Fannin fasahar RF fiye da Fiber da aka fi amfani da shi a fannin sadarwa ta fiber optic, gami da tashoshin tushe na wayar hannu, tsarin rarrabawa, broadband mara waya, talabijin na USB, sadarwa ta hanyar sadarwa ta sirri da sauransu. A cikin 'yan shekarun nan, tare da karuwar microwave photonics, fasahar RF akan Fiber an yi amfani da ita sosai a cikin microwave photon radar, sadarwa ta UAV, binciken ilmin taurari da sauran fannoni. Dangane da nau'ikan laser modulation daban-daban, ana iya raba sadarwa ta laser zuwa modulation na ciki da modulation na waje, wanda aka fi amfani da shi shine modulation na waje, kuma RF akan Fiber bisa ga laser modulation na waje an bayyana shi a cikin wannan takarda. Hanyoyin haɗin RF akan Fiber galibi sun ƙunshi transceiver na gani, watsawa, daHanyoyin haɗin ROF, kamar yadda aka nuna a cikin hoton da ke ƙasa:

Gabatarwa ta ɗan gajeren bayani game da ɓangaren haske. Ana amfani da LD akai-akaiLaser na DFB(nau'in ra'ayoyin da aka rarraba), waɗanda ake amfani da su don ƙananan hayaniya, aikace-aikacen kewayon mai ƙarfi, da kuma lasers na FP (nau'in Fabry-Perot) ana amfani da su don aikace-aikacen da ba su da wahala. Raƙuman raƙuman da aka fi amfani da su sune 1064nm da 1550nm. PD shinena'urar gano hoto, kuma a ɗayan ƙarshen hanyar haɗin fiber optic, ana gano hasken ta hanyar PIN photodiode na mai karɓa, wanda ke canza hasken zuwa siginar lantarki sannan zuwa matakin sarrafa wutar lantarki da aka saba. Fiber optic da ake amfani da shi don haɗin tsakiya yawanci shine fiber optic mai yanayi ɗaya da kuma mai yanayi da yawa. Ana amfani da fiber optic mai yanayi ɗaya a cikin hanyar sadarwa ta baya saboda ƙarancin watsawa da ƙarancin asara. Fiber multimode yana da takamaiman aikace-aikace a cikin hanyar sadarwa ta gida saboda yana da arha don ƙera kuma yana iya ɗaukar watsawa da yawa a lokaci guda. Rage siginar gani a cikin fiber ɗin yana da ƙanƙanta sosai, kawai ~0.25dB/km a 1550nm.

Dangane da halayen watsawa ta layi da watsawa ta gani, hanyoyin haɗin ROF suna da fa'idodin fasaha masu zuwa:

• Rage asara sosai, raguwar zare ƙasa da 0.4 dB/km

• Watsawar fiber mai yawan bandwidth, asarar fiber ba tare da la'akari da mita ba

• Haɗawa da ƙarfin ɗaukar sigina/bandwidth mafi girma har zuwa 110GHz • Juriyar Tsangwama ta Electromagnetic (EMI) (yanayi mara kyau ba ya shafar sigina)

• Ƙarancin farashi a kowace mita • Fiber ya fi sassauƙa da sauƙi, yana ɗaukar kimanin 1/25 na jagorar igiyar ruwa da 1/10 na kebul na coaxial

• Sauƙin tsari na masu daidaita na'urorin lantarki (ga tsarin daukar hoto na likita da na inji)