Optical modulator, siv los tswj kev siv lub teeb, kev faib tawm ntawm electro-optic, thermooptic, acoustooptic, tag nrho cov kho qhov muag, cov kev xav ntawm cov nyhuv electro-optic.
Optical modulator yog ib qho ntawm cov khoom siv kho qhov muag tseem ceeb tshaj plaws hauv kev sib txuas lus siab thiab luv luv.Lub teeb modulator raws li nws cov qauv kev hloov kho, tuaj yeem muab faib ua electro-optic, thermooptic, acoustooptic, txhua qhov kho qhov muag, thiab lwm yam, lawv yog raws li cov kev xav hauv paus yog ntau hom kev sib txawv ntawm cov nyhuv electro-optic, acoustooptic effect, magnetooptic effect. , Franz-Keldysh nyhuv, quantum zoo Stark nyhuv, carrier dispersion nyhuv.
Covelectro-optical modulatoryog ib yam khoom uas tswj cov refractive index, absorptivity, amplitude los yog theem ntawm cov zis lub teeb los ntawm kev hloov ntawm voltage los yog hluav taws xob teb.Nws yog superior rau lwm hom modulators nyob rau hauv cov nqe lus ntawm kev poob, hwj chim noj, ceev thiab kev koom ua ke, thiab kuj yog ib tug feem ntau lug siv modulator tam sim no.Nyob rau hauv cov txheej txheem ntawm optical kis tau tus mob, kis tau tus mob thiab txais tos, optical modulator yog siv los tswj qhov siv ntawm lub teeb, thiab nws lub luag hauj lwm tseem ceeb heev.
Lub hom phiaj ntawm kev hloov kho lub teeb yog los hloov cov teeb liab xav tau lossis cov ntaub ntawv xa mus, suav nrog "kev tshem tawm cov teeb liab keeb kwm yav dhau, tshem tawm suab nrov, thiab tiv thaiv kev cuam tshuam", thiaj li ua kom yooj yim rau kev ua, xa tawm thiab ntes.
Modulation hom tuaj yeem muab faib ua ob pawg dav nyob ntawm qhov chaw uas cov ntaub ntawv raug thauj mus rau lub teeb yoj:
Ib qho yog qhov tsav lub zog ntawm lub teeb pom kev hloov pauv los ntawm lub teeb liab hluav taws xob;Lwm qhov yog los hloov kho qhov kev tshaj tawm ncaj qha.
Qhov qub yog siv rau kev sib txuas lus kho qhov muag, thiab tom kawg yog siv rau qhov muag pom.Rau luv luv: internal modulation thiab sab nraud modulation.
Raws li txoj kev modulation, hom modulation yog:
2) Phase modulation;
3) Polarization modulation;
4) zaus thiab wavelength modulation.
1.1, kev siv zog hloov
Lub teeb siv zog hloov kho yog qhov siv ntawm lub teeb raws li cov khoom siv modulation, kev siv cov khoom siv sab nraud los ntsuas qhov DC lossis qeeb ntawm lub teeb liab hloov mus rau qhov hloov pauv ceev ntawm lub teeb liab, yog li ntawd AC zaus xaiv amplifier tuaj yeem siv rau amplify, thiab ces tus nqi yuav tsum tau ntsuas tawm tsis tu ncua.
1.2, Theem Modulation
Lub hauv paus ntsiab lus ntawm kev siv lwm yam los hloov cov theem ntawm lub teeb yoj thiab ntsuas lub cev kom muaj nuj nqis los ntawm kev txheeb xyuas cov theem hloov pauv yog hu ua optical phase modulation.
Cov theem ntawm lub teeb yoj yog txiav txim los ntawm lub cev ntev ntawm lub teeb propagation, lub refractive index ntawm propagation nruab nrab thiab nws tis, uas yog hais tias, qhov kev hloov ntawm theem ntawm lub teeb yoj yuav generated los ntawm kev hloov cov saum toj no tsis. kom ua tiav theem modulation.
Vim tias lub teeb pom kev feem ntau tsis tuaj yeem pom qhov hloov pauv ntawm theem ntawm lub teeb nthwv dej, peb yuav tsum siv cov cuab yeej cuam tshuam ntawm lub teeb los hloov cov theem hloov mus rau qhov hloov ntawm lub teeb siv, thiaj li ua tiav qhov kev tshawb pom ntawm lub cev sab nraud, yog li ntawd. , qhov kho qhov muag theem hloov kho yuav tsum muaj ob ntu: ib qho yog lub cev lub cev ntawm kev tsim cov theem hloov ntawm lub teeb yoj;Qhov thib ob yog qhov cuam tshuam ntawm lub teeb.
1.3.Polarization modulation
Txoj kev yooj yim tshaj plaws kom ua tiav lub teeb hloov pauv yog tig ob lub polarizers txheeb ze rau ib leeg.Raws li Malus 'theorem, qhov tso zis lub teeb siv yog I = I0cos2α
Qhov twg: I0 sawv cev rau lub teeb ci dhau los ntawm ob lub polarizers thaum lub dav hlau tseem ceeb zoo ib yam;Alpha sawv cev rau lub kaum sab xis ntawm ob lub polarizers lub dav hlau tseem ceeb.
1.4 Zaus thiab wavelength modulation
Lub hauv paus ntsiab lus ntawm kev siv lwm yam los hloov qhov zaus lossis wavelength ntawm lub teeb thiab ntsuas lub cev sab nraud los ntawm kev txheeb xyuas qhov hloov pauv ntawm qhov zaus lossis wavelength ntawm lub teeb yog hu ua zaus thiab wavelength modulation ntawm lub teeb.
Post lub sij hawm: Aug-01-2023