Hoʻolauna i ka hoʻopili ʻana o ka hoʻoili ʻana o ka RF optical RF ma luna o Fiber

Hoʻolauna i ka hoʻopili ʻana oHoʻoili ʻōpae RFRF ma luna o ka Fiber

I nā makahiki i hala iho nei, ua ulu wikiwiki ka ʻenehana kamaʻilio microwave a me ke kelepona optical. Ua holomua nui nā ʻenehana ʻelua i kā lākou mau kahua, a ua alakaʻi pū i ka hoʻomohala wikiwiki ʻana o ke kamaʻilio kelepona a me nā lawelawe hoʻoili ʻikepili, e lawe mai ana i ka maʻalahi i ke ola o kānaka. Loaʻa i nā ʻenehana ʻelua o ke kamaʻilio microwave a me ke kamaʻilio photoelectric ko lākou mau pono ponoʻī, akā he mau hemahema ko lākou i hiki ʻole ke lanakila. Pono ka hoʻoili photoelectric i ka pūnaewele kino, a aia kekahi mau hemahema i ka maʻalahi, ka pūnaewele wikiwiki a me ka neʻe ʻana o ke kūkulu ʻana. Loaʻa i ke kamaʻilio microwave kekahi mau hemahema i ka hoʻoili mamao a me ka nui o ka mana, a pono i ka microwave ka hoʻonui pinepine ʻana a me ka hoʻoili hou ʻana, a ua kaupalena ʻia ka bandwidth hoʻoili e ka alapine lawe. Ua alakaʻi kēia i ka hoʻohui ʻana o ka ʻenehana hoʻoili microwave a me ka optical Fiber, ʻo ia hoʻi, ʻenehana Radio ma luna o Fiber (ROF), i kapa pinepine ʻia ʻoRF ma luna o ka Fiber, a i ʻole ka ʻenehana mamao alapine lekiō. ʻO ke kahua i hoʻohana nui ʻia o ka ʻenehana RF ma luna o Fiber ʻo ia ke kahua o ke kamaʻilio fiber optical, me nā kikowaena kumu kelepona, nā ʻōnaehana i hoʻolaha ʻia, ka broadband uea ʻole, ke TV uwea, nā kamaʻilio pūnaewele pilikino a pēlā aku. I nā makahiki i hala iho nei, me ka piʻi ʻana o ka microwave photonics, ua hoʻohana nui ʻia ka ʻenehana RF ma luna o Fiber i ka microwave photon radar, ke kamaʻilio UAV, ka noiʻi astronomy a me nā kahua ʻē aʻe. Wahi a nā ʻano like ʻole o ka modulation laser, hiki ke hoʻokaʻawale ʻia ke kamaʻilio laser i ka modulation kūloko a me ka modulation waho, ʻo ka mea maʻamau i hoʻohana ʻia ʻo ka modulation waho, a ua wehewehe ʻia ka RF ma luna o Fiber e pili ana i ka modulation laser waho ma kēia pepa. ʻO nā loulou RF ma luna o Fiber i haku nui ʻia me ka transceiver optical, ka hoʻoili ʻana, a meNā loulou ROF, e like me ka mea i hōʻike ʻia ma ke kiʻi aʻe:

He hoʻolauna pōkole i ka ʻāpana māmā. Hoʻohana pinepine ʻia ʻo LDNā kukuna DFB(ʻano manaʻo hoʻolaha), i hoʻohana ʻia no ka walaʻau haʻahaʻa, nā noi laulā dynamic kiʻekiʻe, a me nā lasers FP (ʻano Fabry-Perot) i hoʻohana ʻia no nā noi koi ʻole. ʻO nā nalu maʻamau i hoʻohana ʻia he 1064nm a me 1550nm. ʻO ka PD hemea ʻike kiʻi, a ma kekahi ʻaoʻao o ka loulou fiber optic, ʻike ʻia ke kukui e ka PIN photodiode o ka mea loaʻa, ka mea e hoʻololi i ke kukui i kahi hōʻailona uila a laila i loko o ke kaʻina hana uila maʻamau. ʻO ka fiber optical i hoʻohana ʻia no ka pilina waena he fiber optical mode hoʻokahi a me multi-mode. Hoʻohana pinepine ʻia ka fiber mode hoʻokahi i ka pūnaewele iwi kuamoʻo ma muli o kona hoʻopuehu haʻahaʻa a me ka pohō haʻahaʻa. Loaʻa i ka fiber multimode kahi noi ma ka pūnaewele wahi kūloko no ka mea he mea kūʻai ʻole ke hana a hiki ke hoʻokipa i nā hoʻoili he nui i ka manawa like. He liʻiliʻi loa ka attenuation o ka hōʻailona optical i loko o ka fiber, ʻo ~ 0.25dB/km wale nō ma 1550nm.

Ma muli o nā ʻano o ka hoʻoili linear a me ka hoʻoili optical, loaʻa i nā loulou ROF nā pono loea penei:

• Haʻahaʻa loa ka pohō, emi ka emi ʻana o ka fiber ma mua o 0.4 dB/km

• Hoʻoili ultra-bandwidth fiber, nalowale fiber kūʻokoʻa o ke alapine (frequency)

• Hoʻohui me ka hiki ke hāpai i ka hōʻailona/bandwidth kiʻekiʻe a hiki i ka 110GHz • Ke kū'ē ʻana i ka Electromagnetic Interference (EMI) (ʻaʻole pili ka ʻino i ka hōʻailona)

• Kumukūʻai haʻahaʻa no ka mika • ʻOi aku ka maʻalahi o ka fiber a me ka māmā, ʻoi aku ke kaumaha ma kahi o 1/25 o ke alakaʻi nalu a me 1/10 o ke kaula coaxial

• Hoʻonohonoho maʻalahi a maʻalahi hoʻi o nā modulators electro-optic (no nā ʻōnaehana kiʻi lapaʻau a me nā ʻōnaehana mechanical)