Imodulator yokubonisa, esetyenziselwa ukulawula ubukhali bokukhanya, ukuhlelwa kwe-electro-optic, i-thermooptic, i-acoustooptic, yonke i-optical, ithiyori esisiseko ye-electro-optic effect.
I-Optical modulator yenye yezona zixhobo zibalulekileyo ze-optical ezidityanisiweyo kunxibelelwano lwe-optical olukhawulezayo nolufutshane. I-modulator yokukhanya ngokwemigaqo yayo yokuguqulwa, inokwahlulwahlulwa ibe yi-electro-optic, i-thermooptic, i-acoustooptic, yonke i-optical, njl., zisekelwe kwingcamango esisiseko yintlobo ngeentlobo ze-electro-optic effect, i-acoustooptic effect, i-magnetooptic effect, i-Franz-Keldysh effect, i-quantum well Stark effect, i-carrier dispersion effect.
Ii-modulator ye-electro-opticalsisixhobo esilawula i-refractive index, i-absorptivity, i-amplitude okanye isigaba sokukhanya okuphumayo ngokutshintsha kwe-voltage okanye intsimi yombane. Singcono kunezinye iintlobo zee-modulators ngokubhekiselele ekulahlekelweni, ukusetyenziswa kwamandla, isantya kunye nokuhlanganiswa, kwaye sikwayi-modulator esetyenziswa kakhulu okwangoku. Kwinkqubo yokudlulisa ukukhanya, ukuhambisa kunye nokwamkela, i-modulator ye-optical isetyenziselwa ukulawula ubukhali bokukhanya, kwaye indima yayo ibaluleke kakhulu.
Injongo yokuguqulwa kokukhanya kukuguqula isignali efunekayo okanye ulwazi oludluliselweyo, kuquka "ukususa isignali yangasemva, ukususa ingxolo, kunye nokuchasana nokuphazamiseka", ukuze kube lula ukuyicubungula, ukuyithumela nokuyifumanisa.
Iindidi zokuguquguquka zingahlulwa zibe ziindidi ezimbini ezibanzi ngokuxhomekeke apho ulwazi lufakwe khona kwi-light wave:
Enye ngamandla okuqhuba omthombo wokukhanya alawulwa sisignali yombane; Enye kukulawula usasazo ngokuthe ngqo.
Eyokuqala isetyenziswa kakhulu kunxibelelwano lwe-optical, kwaye eyesibini isetyenziswa kakhulu kwi-optical sensing. Ngamafutshane: i-internal modulation kunye ne-external modulation.
Ngokwendlela yokuguqula, uhlobo lokuguqula lulandelayo:
3) Ukuguqulwa kwe-polarization;
4) Ukuguqulwa kwefrikhwensi kunye nobude bomda.
1.1, ukuguqulwa kwamandla
Ukuguqulwa kwamandla okukhanya bubunzulu bokukhanya njengento yokuguquguquka, ukusetyenziswa kwezinto zangaphandle ukulinganisa i-DC okanye ukutshintsha kancinci kwesignali yokukhanya ibe kutshintsho olukhawulezayo lwefrikhwensi yesignali yokukhanya, ukuze i-AC frequency selection amplifier isetyenziswe ukukhulisa, kwaye emva koko ubungakanani obumele bulinganiswe rhoqo.
1.2, uhlengahlengiso lwesigaba
Umgaqo wokusebenzisa izinto zangaphandle ukutshintsha isigaba samaza okukhanya kunye nokulinganisa ubungakanani bomzimba ngokubona utshintsho lwesigaba ubizwa ngokuba yi-optical phase modulation.
Isigaba segagasi lokukhanya simiselwa bubude bokukhanya okubonakalayo, isalathisi sokuchasana kwesixhobo sokusasazeka kunye nokusasazwa kwaso, oko kukuthi, utshintsho lwesigaba segagasi lokukhanya lunokwenziwa ngokutshintsha iiparameter ezingentla ukuze kufezekiswe ukuguquguquka kwesigaba.
Ngenxa yokuba isixhobo sokukhangela ukukhanya ngokubanzi asikwazi ukubona utshintsho lwesigaba segagasi lokukhanya, kufuneka sisebenzise iteknoloji yokuphazamiseka kokukhanya ukuguqula utshintsho lwesigaba lube kutshintsho lobukhali bokukhanya, ukuze kufezekiswe ukufunyanwa kobuninzi bomzimba bangaphandle, ngoko ke, i-optical phase modulation kufuneka iquke amacandelo amabini: enye yindlela yokwenza utshintsho lwesigaba segagasi lokukhanya; eyesibini kukuphazamiseka kokukhanya.
1.3. Ukuguqulwa kwe-polarization
Eyona ndlela ilula yokufikelela kwimodulation yokukhanya kukujikeleza ii-polarizers ezimbini xa zithelekiswa. Ngokwethiyori kaMalus, amandla okukhanya okuphumayo yi-I=I0cos2α.
Apho: I0 imele ukukhanya okugqithiswa zii-polarizers ezimbini xa i-principal plane ihambelana; I-Alpha imele i-Angle phakathi kwe-principal planes ezimbini ze-polarizers.
1.4 Ukuguqulwa kwefrikhwensi kunye nobude bomda
Umgaqo wokusebenzisa izinto zangaphandle ukutshintsha i-frequency okanye ubude bokukhanya kunye nokulinganisa ubungakanani bangaphandle bezinto ezibonakalayo ngokubona utshintsho kwi-frequency okanye ubude bokukhanya kuthiwa yi-frequency kunye ne-wavelength modulation of light.
Ixesha lokuthumela: Agasti-01-2023