Kodi ukadaulo wa laser modulation ndi chiyani

Ndi chiyanikusintha kwa laserluso

Kuwala ndi mtundu wa mafunde a electromagnetic okhala ndi ma frequency apamwamba. Ili ndi mgwirizano wabwino kwambiri ndipo motero, monga mafunde am'mbuyomu amagetsi (monga mawailesi ndi ma TV), atha kugwiritsidwa ntchito ngati chonyamulira potumiza uthenga. Chidziwitso "chonyamulidwa" ndi laser (kuphatikizapo chinenero, malemba, zithunzi, zizindikiro, ndi zina zotero) chimatumizidwa kwa wolandira kudzera mu njira zina zotumizira (mlengalenga, optical fibers, etc.), ndiyeno zimazindikiridwa ndi kubwezeretsedwa ku chidziwitso choyambirira ndi wolandira kuwala. Njira yoyika zambiri pa laser imatchedwa modulation, ndipo chipangizo chomwe chimakwaniritsa izi chimatchedwa modulator. Pakati pawo, laser amatchedwa chonyamulira yoweyula; Chidziwitso chotsika kwambiri chomwe chimagwira ntchito yolamulira chimatchedwa chizindikiro cha modulated.

Laser modulation akhoza kugawidwa mu kusintha kwa mkati ndi kusinthasintha kwa kunja.

Kusinthasintha kwamkati: Kumatanthawuza kukweza kwa ma siginecha osinthika panthawi ya laser oscillation, ndiye kuti, kugwiritsa ntchito ma siginecha osinthika kuti asinthe magawo a oscillation a laser, potero amasintha mawonekedwe a laser kuti akwaniritse kusintha. Njira zosinthira mkati zikuphatikizapo: 1. Kuwongolera mwachindunji mphamvu yamagetsi yamagetsi a laser kuti akwaniritse mphamvu ya laser modulated linanena bungwe. Mphamvu ndi kupezeka kwa zotulutsa zonse zimayendetsedwa ndi magetsi. Ngati chizindikiro chomwe chiyenera kupatsirana chikugwiritsidwa ntchito poyang'anira magetsi a laser, kupanga kusintha kwamakono kudzera mu laser yoyendetsedwa ndi chizindikiro, ndiye kuti laser yotulutsidwa idzayendetsedwanso ndi chizindikiro. 2. Zinthu zosinthika zimayikidwa mkati mwa mphuno ya resonant, ndipo mawonekedwe a thupi la zinthu zosinthika amayendetsedwa ndi zizindikiro kuti asinthe, potero amasintha magawo a phokoso la resonant ndikusintha maonekedwe a laser kuti akwaniritse kusintha. Ubwino wa kusinthasintha kwamkati ndi kusinthasintha kwake kwakukulu. The drawback ndi kuti popeza modulator anayikidwa mkati patsekeke, ndi ofanana ndi kuonjezera imfa mkati patsekeke, kuchepetsa linanena bungwe mphamvu, ndi bandiwifi wa modulator malire ndi passband wa patsekeke resonant.

Kusintha kwakunja: Zimatanthawuza kuyika kwa modulator panjira ya kuwala kunja kwa laser laser itapangidwa, ndipo mawonekedwe akuthupi a modulator amasinthidwa ndi chizindikiro chosinthira. Laser ikadutsa pa modulator, gawo lina la kuwala kwa mafunde lidzasinthidwa. Ubwino wa kusinthasintha kwakunja ndikuti sichimakhudza mphamvu yamagetsi ya laser ndipo bandwidth ya jenereta sichimangokhala ndi passband ya resonant cavity. The drawback ndi otsika kusinthasintha mphamvu.

Laser modulation akhoza m'gulu kusinthasintha matalikidwe, pafupipafupi kusinthasintha, gawo kusinthasintha ndi mphamvu kusinthasintha, etc. malinga ndi kusinthasintha kwake chikhalidwe. Ma modulators ofananira nawo akuphatikizapogawo modulators, mphamvu modulators, ndi zina. Kupatula kusinthasintha kwamphamvu kwa ma electro-optic ndi electro-optic phase modulation, Pali mitundu yambiri ya ma electro-optic intensity modulation.laser modulators, monga chopingasaelectro-optic modulators, ma electro-optic modulators oyendayenda, Kerr electro-optic modulators, acousto-optic modulators, magneto-optic modulators, interference modulators ndi spatial light modulators, etc.