He aha ka ʻenehana modulation laser

He aha kahoʻololi laserʻenehana

ʻO ka māmā kahi ʻano hawewe electromagnetic me ke alapine kiʻekiʻe. Loaʻa iā ia ka pilina maikaʻi a no laila, e like me nā hawewe electromagnetic mua (e like me nā lekiō a me nā televise), hiki ke hoʻohana ʻia ma ke ʻano he mea lawe no ka hoʻouna ʻana i ka ʻike. Hoʻouna ʻia ka ʻike "i lawe ʻia" e ka laser (me ka ʻōlelo, ka kikokikona, nā kiʻi, nā hōʻailona, ​​​​a me nā mea ʻē aʻe) i ka mea hoʻokipa ma o kekahi mau ala hoʻouna (ka lewa, nā fibers optical, a me nā mea ʻē aʻe), a laila ʻike ʻia a hoʻihoʻi ʻia i ka ʻike kumu e ka mea ʻike. ʻO ke kaʻina hana o ka hoʻouka ʻana i ka ʻike ma luna o ka laser i kapa ʻia ʻo modulation, a ʻo ka mea hana e hoʻokō i kēia kaʻina i kapa ʻia he modulator. I waena o lākou, ua kapa ʻia ka laser i ka nalu lawe; ʻO ka ʻike haʻahaʻa haʻahaʻa e pāʻani ana i kahi kuleana hoʻomalu i kapa ʻia he hōʻailona modulated.

Hiki ke hoʻokaʻawale ʻia ka modulation laser i loko o ka modulation kūloko a me ka modulation waho.

Hoʻololi i loko: E pili ana i ka hoʻouka ʻana o nā hōʻailona modulated i ka wā o ke kaʻina oscillation laser, ʻo ia hoʻi, me ka hoʻohana ʻana i nā hōʻailona modulated e hoʻololi i nā ʻāpana oscillation o ka laser, a laila e hoʻololi i nā hiʻohiʻona laser e hoʻokō ai i ka modulation. ʻO nā ʻano o ka hoʻololi ʻana i loko: 1. Ke hoʻomalu pono ʻana i ka mana hoʻopihapiha laser e hoʻokō i ka ikaika o ka laser output modulated. ʻO ka ikaika a me ka hele ʻana o ka puka e hoʻomalu ʻia e ka mana lako. Inā hoʻohana ʻia ka hōʻailona e hoʻouna ʻia e kaohi i ka mana laser, e hana ana i nā loli o kēia manawa ma o ka laser i hoʻomalu ʻia e ka hōʻailona, ​​a laila e hoʻomalu ʻia ka laser emitted e ka hōʻailona. 2. Hoʻokomo ʻia nā mea hoʻololi i loko o ka lua resonant, a mālama ʻia nā ʻano kino o nā mea modulation e nā hōʻailona e hoʻololi, a laila e hoʻololi i nā ʻāpana o ka lua resonant a hoʻololi i nā hiʻohiʻona puka laser e hoʻokō ai i ka modulation. ʻO ka pōmaikaʻi o ka modulation kūloko, ʻo ia ka pono modulation kiʻekiʻe. ʻO ka drawback, ʻoiai ua hoʻokomo ʻia ka modulator i loko o ka lua, ua like ia me ka hoʻonui ʻana i ka nalowale i loko o ka lua, e hōʻemi ana i ka mana puka, a ua kaupalena ʻia ka bandwidth o ka modulator e ka passband o ka resonant cavity.

Hoʻololi i waho: E pili ana i ka hoʻokomo ʻana o kahi modulator ma ke ala optical ma waho o ka laser ma hope o ka hana ʻana o ka laser, a ua hoʻololi ʻia nā ʻano kino o ka modulator e ka hōʻailona modulation. Ke hele ka laser i ka modulator, e hoʻololi ʻia kekahi ʻāpana o ka nalu māmā. ʻO ka pōmaikaʻi o ka modulation o waho, ʻaʻole ia e hoʻopili i ka mana puka o ka laser a ʻaʻole i kaupalena ʻia ka bandwidth o ka generator e ka passband o ka resonant cavity. ʻO ka drawback ka haʻahaʻa modulation pono.

Hiki ke hoʻokaʻawale ʻia ka laser modulation i ka amplitude modulation, frequency modulation, phase modulation a me ka ikaika modulation, etc. e like me kona ʻano modulation. ʻO nā modulators maʻamau e pili ananā mea modulators, mea hoʻololi ikaika, etc. Ma waho aʻe o ka electro-optic intensity modulation a me ka electro-optic phase modulation, He nui nā ʻanonā mea hoʻololi laser, e like me ka transverseelectro-optic modulators, nā mea hoʻololi hawewe hele electro-optic, Kerr electro-optic modulators, acousto-optic modulators, magneto-optic modulators, interference modulators a me spatial light modulators, etc.