Lub hauv paus ntsiab lus ntawm Optical modulator

Cov khoom siv kho qhov muag, siv los tswj qhov muaj zog ntawm lub teeb, kev faib tawm ntawm electro-optic, thermooptic, acoustooptic, txhua yam optical, kev tshawb fawb yooj yim ntawm electro-optic nyhuv.
Optical modulator yog ib qho tseem ceeb tshaj plaws hauv kev sib txuas lus optical hauv kev sib txuas lus ceev thiab luv luv. Lub teeb modulator raws li nws txoj cai modulation, tuaj yeem muab faib ua electro-optic, thermooptic, acoustooptic, txhua yam optical, thiab lwm yam., lawv raws li lub hauv paus ntsiab lus yog ntau yam ntawm cov nyhuv electro-optic, acoustooptic nyhuv, magnetooptic nyhuv, Franz-Keldysh nyhuv, quantum zoo Stark nyhuv, carrier dispersion nyhuv.

Lubelectro-optical modulatoryog ib lub cuab yeej uas tswj cov refractive index, absorptivity, amplitude lossis theem ntawm lub teeb tso zis los ntawm kev hloov pauv ntawm voltage lossis hluav taws xob teb. Nws zoo dua li lwm hom modulators hauv kev poob, kev siv hluav taws xob, kev ceev thiab kev koom ua ke, thiab tseem yog modulator siv dav tshaj plaws tam sim no. Hauv cov txheej txheem ntawm kev xa hluav taws xob, kev xa thiab kev txais, lub modulator optical siv los tswj qhov muaj zog ntawm lub teeb, thiab nws lub luag haujlwm tseem ceeb heev.

Lub hom phiaj ntawm kev hloov kho lub teeb yog hloov cov teeb liab xav tau lossis cov ntaub ntawv xa tawm, suav nrog "tshem tawm cov teeb liab keeb kwm yav dhau los, tshem tawm suab nrov, thiab tiv thaiv kev cuam tshuam", kom yooj yim rau kev ua tiav, xa tawm thiab ntes tau.

Cov hom kev hloov pauv tuaj yeem muab faib ua ob pawg dav dav nyob ntawm seb cov ntaub ntawv tau thauj mus rau ntawm lub teeb nthwv dej qhov twg:

Ib qho yog lub zog tsav ntawm lub teeb ci uas tau hloov kho los ntawm lub teeb liab hluav taws xob; Qhov tod tes yog hloov kho qhov kev tshaj tawm ncaj qha.

Tus thawj yog siv rau kev sib txuas lus optical, thiab tus tom kawg yog siv rau kev pom optical. Rau luv luv: kev hloov kho sab hauv thiab kev hloov kho sab nraud.

Raws li txoj kev modulation, hom modulation yog:

1) Kev hloov kho qhov muaj zog;

2) Kev hloov kho theem;

3) Kev hloov pauv polarization;

4) Kev hloov pauv zaus thiab qhov ntev ntawm qhov ntev.

1.1, kev hloov kho qhov muaj zog

Kev hloov kho qhov ci ntsa iab yog qhov ci ntsa iab ua lub luag haujlwm hloov kho, siv cov yam ntxwv sab nraud los ntsuas DC lossis hloov qeeb ntawm lub teeb liab mus rau hauv qhov hloov pauv zaus sai dua ntawm lub teeb liab, yog li ntawd lub zog xaiv AC tuaj yeem siv los ua kom nrov dua, thiab tom qab ntawd ntsuas qhov ntau npaum li cas tas li.

1.2, theem kev hloov kho

Lub hauv paus ntsiab lus ntawm kev siv cov yam ntxwv sab nraud los hloov theem ntawm cov nthwv dej teeb thiab ntsuas cov khoom siv los ntawm kev kuaj pom cov kev hloov pauv theem hu ua optical phase modulation.

Lub sijhawm ntawm lub teeb nthwv dej yog txiav txim siab los ntawm lub cev ntev ntawm lub teeb kis, qhov ntsuas refractive ntawm qhov nruab nrab kis thiab nws qhov kev faib tawm, uas yog hais tias, qhov kev hloov pauv ntawm theem ntawm lub teeb nthwv dej tuaj yeem tsim los ntawm kev hloov cov kev ntsuas saum toj no kom ua tiav theem modulation.

Vim tias lub tshuab ntes teeb feem ntau tsis tuaj yeem pom qhov kev hloov pauv ntawm theem ntawm lub teeb nthwv dej, peb yuav tsum siv cov thev naus laus zis cuam tshuam ntawm lub teeb los hloov qhov kev hloov pauv theem mus rau qhov kev hloov pauv ntawm lub teeb, txhawm rau kom ua tiav qhov kev tshawb pom ntawm cov khoom sab nraud, yog li ntawd, qhov kev hloov kho theem kho qhov muag yuav tsum suav nrog ob ntu: ib qho yog lub cev ntawm kev tsim cov kev hloov pauv theem ntawm lub teeb nthwv dej; Qhov thib ob yog kev cuam tshuam ntawm lub teeb.

1.3. Kev hloov pauv polarization

Txoj kev yooj yim tshaj plaws los ua kom lub teeb hloov pauv yog tig ob lub polarizers sib piv rau ib leeg. Raws li Malus 'theorem, qhov tso zis lub teeb ci yog I = I0cos2α

Qhov twg: I0 sawv cev rau lub zog ntawm lub teeb uas ob lub polarizers hla dhau thaum lub dav hlau tseem ceeb sib xws; Alpha sawv cev rau lub kaum sab xis ntawm ob lub dav hlau tseem ceeb ntawm ob lub polarizers.

1.4 Kev hloov pauv zaus thiab qhov ntev ntawm qhov ntev

Lub hauv paus ntsiab lus ntawm kev siv cov yam ntxwv sab nraud los hloov qhov zaus lossis qhov ntev ntawm lub teeb thiab ntsuas cov khoom sab nraud los ntawm kev ntes cov kev hloov pauv ntawm qhov zaus lossis qhov ntev ntawm lub teeb hu ua qhov zaus thiab qhov ntev ntawm lub teeb.