Hoʻolauna i ka ʻōnaehana RF ma luna o ka fiber

Hoʻolauna i ka ʻōnaehana RF ma luna o ka fiber

RF ma luna o ka fiberʻo ia kekahi o nā noi koʻikoʻi o ka microwave photonics a hōʻike i nā pono kūlike ʻole ma nā kahua holomua e like me ka microwave photonic radar, astronomical radio telephoto, a me ke kamaʻilio ʻana o nā kaʻa lewa unmanned.

ʻO ka RF ma luna o ka fiberLoulou ROFua hana nui ʻia me nā mea hoʻoili optical, nā mea loaʻa optical a me nā kaula optical. E like me ka mea i hōʻike ʻia ma ke Kiʻi 1.

Nā mea hoʻoili ʻike maka: Nā lasers manaʻo hoʻolaha (Kukuna DFB) ua hoʻopili ʻia i nā noi haʻahaʻa-walaʻau a me nā noi pae kiʻekiʻe-dynamic, ʻoiai ua hoʻohana ʻia nā lasers FP i nā noi me nā koi haʻahaʻa. Loaʻa i kēia mau lasers nā nalu o 1310nm a i ʻole 1550nm.

Mea loaʻa optical: Ma kekahi ʻaoʻao o ka loulou fiber optical, ʻike ʻia ke kukui e ka PIN photodiode o ka mea loaʻa, ka mea e hoʻololi i ke kukui i ke au.

Nā kaula optical: ʻAʻole like me nā olonā multimode, hoʻohana ʻia nā olonā mode hoʻokahi i nā loulou linear ma muli o ko lākou hoʻopuehu haʻahaʻa a me ka pohō haʻahaʻa. Ma kahi nalu o 1310nm, ʻoi aku ka liʻiliʻi o ka hōʻailona optical i loko o ka olonā optical ma mua o 0.4dB/km. Ma 1550nm, ʻoi aku ka liʻiliʻi ma mua o 0.25dB/km.

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

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

• Hoʻoili ultra-bandwidth fiber optical, kūʻokoʻa ka pohō fiber optical i ka alapine (frequency)

ʻOi aku ka kiʻekiʻe o ka hiki ke lawe i ka hōʻailona/bandwidth o ka loulou, a hiki i DC a i 40GHz

• Anti-electromagnetic interference (EMI) (ʻAʻohe hopena hōʻailona i ka wā ʻino)

• Kumukūʻai haʻahaʻa no ka mika • ʻOi aku ka maʻalahi a me ka māmā o nā olonā optical, ke kaupaona nei ma kahi o 1/25 o nā alakaʻi nalu a me 1/10 o nā kaula coaxial

• Hoʻonohonoho kūpono a maʻalahi hoʻi (no nā ʻōnaehana kiʻi lapaʻau a me nā mīkini)

Wahi a ke ʻano o ka mea hoʻoili optical, ua māhele ʻia ka ʻōnaehana RF ma luna o ka fiber i ʻelua ʻano: ka modulation pololei a me ka modulation waho. Hoʻohana ka mea hoʻoili optical o ka ʻōnaehana RF ma luna o ka fiber i ka laser DFB modulated pololei, nona nā pono o ke kumukūʻai haʻahaʻa, ka liʻiliʻi a me ka hoʻohui maʻalahi, a ua hoʻohana nui ʻia. Eia nō naʻe, i kaupalena ʻia e ka chip laser DFB modulated pololei, hiki ke hoʻopili ʻia ka RF modulated pololei ma luna o ka fiber ma ke alapine alapine ma lalo o 20GHz. Ke hoʻohālikelike ʻia me ka modulation pololei, ua haku ʻia ka RF modulation waho ma luna o ka fiber optical transmitter me kahi laser DFB alapine hoʻokahi a me kahi modulator electro-optic. Ma muli o ka oʻo ʻana o ka ʻenehana modulator electro-optic, hiki i ka ʻōnaehana modulation waho RF ma luna o ka fiber ke hoʻokō i nā noi ma ke alapine alapine ma mua o 40GHz. Eia naʻe, ma muli o ka hoʻohui ʻana omea hoʻololi uila-optic, ʻoi aku ka paʻakikī o ka ʻōnaehana a ʻaʻole kūpono i ka hoʻopili ʻana. ʻO ka loaʻa ʻana o ka loulou ROF, ka helu walaʻau a me ka laulā dynamic nā palena koʻikoʻi o nā loulou ROF, a aia kahi pilina pili ma waena o nā mea ʻekolu. No ka laʻana, ʻo ka helu walaʻau haʻahaʻa ʻo ia hoʻi kahi laulā dynamic nui, ʻoiai ʻaʻole pono wale ka loaʻa kiʻekiʻe e kēlā me kēia ʻōnaehana, akā he hopena nui hoʻi i nā ʻano hana ʻē aʻe o ka ʻōnaehana.