Optical modulator, e sebelisetsoang ho laola matla a leseli, lihlopha tsa electro-optic, thermooptic, acoustooptic, all optical, theory ea motheo ea electro-optic effect.
Optical modulator ke e 'ngoe ea lisebelisoa tsa bohlokoahali tse kopaneng tsa optical puisanong e potlakileng le e khuts'oane. Modulator e khanyang ho ea ka molao-motheo oa eona oa ho feto-fetoha ha maemo, e ka aroloa ka electro-optic, thermooptic, acoustooptic, all optical, joalo-joalo, li thehiloe khopolong ea motheo ke mefuta e sa tšoaneng ea mefuta e fapaneng ea phello ea electro-optic, phello ea acoustooptic, magnetooptic effect, Franz-Keldysh effect, quantum well Starspersion effect, carrier dispersion effect.
Themochine oa motlakase oa motlakaseke sesebelisoa se laolang index ea refractive, absorptivity, amplitude kapa phase of light output ka phetoho ea motlakase kapa motlakase. E phahametse mefuta e meng ea li-modulator mabapi le tahlehelo, tšebeliso ea matla, lebelo le kopanyo, hape ke modulator e sebelisoang ka ho fetisisa hona joale. Ts'ebetsong ea phetisetso ea optical, phetisetso le kamohelo, modulator ea optical e sebelisoa ho laola matla a leseli, mme karolo ea eona ke ea bohlokoa haholo.
Sepheo sa ho feto-fetoha ha leseli ke ho fetola lets'oao le lakatsehang kapa tlhahisoleseling e fetisitsoeng, ho kenyelletsa le "ho tlosa lets'oao le ka morao, ho tlosa lerata, le ho thibela tšitiso", e le ho etsa hore ho be bonolo ho sebetsa, ho fetisa le ho lemoha.
Mefuta ea ho feto-fetoha ha molumo e ka aroloa ka mekhahlelo e 'meli e pharaletseng ho itšetlehile ka hore na boitsebiso bo kenngoa hokae holim'a leqhubu la leseli:
E 'ngoe ke matla a ho khanna a mohloli oa leseli o fetotsoeng ke lets'oao la motlakase; E 'ngoe ke ho hlophisa khaso ka kotloloho.
Ea pele e sebelisoa haholo-holo bakeng sa puisano ea optical, 'me ea morao-rao e sebelisoa haholo-holo bakeng sa ho lemoha mahlo. Ka bokhutšoane: ho feto-fetoha ha ka hare le ho fetola ka ntle.
Ho latela mokhoa oa modulation, mofuta oa modulation ke:
3) Polarization modulation;
4) Ho feto-fetoha ha maqhubu le maqhubu a maqhubu.
1.1, ho feto-fetoha ha matla
Khanya e matla ea ho feto-fetoha ke matla a leseli e le ntho ea modulation, tšebeliso ea lintlha tse ka ntle ho lekanya DC kapa phetoho e liehang ea lets'oao la leseli hore e be phetoho e potlakileng ea maqhubu a lets'oao la leseli, e le hore amplifier ea khetho ea AC e ka sebelisoa ho holisa, ebe chelete e lokela ho lekanyetsoa ka mokhoa o tsoelang pele.
1.2, ho feto-fetoha ha maemo
Molao-motheo oa ho sebelisa lintlha tse ka ntle ho fetola mohato oa maqhubu a khanya le ho lekanya boholo ba 'mele ka ho lemoha liphetoho tsa mohato o bitsoa optical phase modulation.
Mokhahlelo oa leqhubu la leseli o khethoa ke bolelele ba 'mele oa ho phatlalatsoa ha leseli, index ea refractive ea mecha ea phatlalatso le kabo ea eona, ke hore, phetoho ea mohato oa leqhubu la leseli e ka hlahisoa ka ho fetola litekanyo tse ka holimo ho fihlela modulation ea mohato.
Hobane mochine oa leseli ka kakaretso o ke ke oa lemoha phetoho ea mohato oa leqhubu la leseli, re tlameha ho sebelisa theknoloji ea tšitiso ea leseli ho fetola phetoho ea mohato ho fetoha ha matla a leseli, e le ho finyella ho lemoha ha bongata ba 'mele bo ka ntle, ka hona, optical phase modulation e lokela ho kenyelletsa likarolo tse peli: e' ngoe ke mochine oa 'mele oa ho hlahisa phetoho ea mohato oa leqhubu la leseli; Ea bobeli ke ho kena-kenana le leseli.
1.3. Polarization modulation
Tsela e bonolo ka ho fetisisa ea ho finyella ho feto-fetoha ha leseli ke ho potoloha li-polarizer tse peli tse amanang le tse ling. Ho latela theorem ea Malus, matla a khanya a hlahisoang ke I=I0cos2α
Moo: I0 e emela matla a khanya a fetisitsoeng ke li-polarizer tse peli ha sefofane se ka sehloohong se lumellana; Alpha e emela Angle pakeng tsa lifofane tse peli tse ka sehloohong tsa polarizers.
1.4 Ho feto-fetoha ha maqhubu le bolelele ba maqhubu
Molao-motheo oa ho sebelisa lintlha tse ka ntle ho fetola maqhubu kapa bolelele ba maqhubu a khanya le ho lekanya boholo ba 'mele oa kantle ka ho lemoha liphetoho tsa maqhubu kapa bolelele ba maqhubu a khanya o bitsoa frequency le wavelength modulation of light.
Nako ea poso: Aug-01-2023