Kev piav qhia txog plaub lub modulators uas siv ntau

Kev piav qhia txog plaub lub modulators uas siv ntau

Tsab ntawv no qhia txog plaub txoj kev hloov kho (hloov qhov amplitude ntawm lub laser hauv lub sijhawm nanosecond lossis subnanosecond) uas feem ntau siv hauv cov tshuab fiber laser. Cov no suav nrog AOM (acousto-optic modulation), EOM (electro-optic modulation), SOM/SOA(kev ua kom lub teeb semiconductor loj dua kuj hu ua kev hloov kho semiconductor), thiabkev hloov kho laser ncaj qha. Ntawm lawv, AOM,EOM, SOM koom nrog kev hloov kho sab nraud, lossis kev hloov kho tsis ncaj qha.

1. Acousto-optic Modulator (AOM)

Kev hloov kho suab paj nruag yog ib qho txheej txheem uas siv cov nyhuv acousto-optic los thauj cov ntaub ntawv rau ntawm lub tshuab nqa khoom siv kho qhov muag. Thaum hloov kho, lub teeb liab hluav taws xob (amplitude modulation) thawj zaug siv rau lub tshuab hloov pauv hluav taws xob, uas hloov lub teeb liab hluav taws xob mus rau hauv lub teb ultrasonic. Thaum lub teeb nthwv dej hla dhau lub nruab nrab acousto-optic, lub tshuab nqa khoom siv kho qhov muag raug hloov kho thiab dhau los ua nthwv dej hloov kho uas nqa cov ntaub ntawv vim yog qhov kev ua ntawm acousto-optic.

2. Electro-optical Modulator(EOM)

Ib qho electro-optical modulator yog ib qho modulator uas siv cov teebmeem electro-optical ntawm qee cov electro-optical crystals, xws li lithium niobate crystals (LiNb03), GaAs crystals (GaAs) thiab lithium tantalate crystals (LiTa03). Cov teebmeem electro-optical yog tias thaum lub zog hluav taws xob raug siv rau electro-optical crystal, qhov refractive index ntawm electro-optical crystal yuav hloov pauv, ua rau muaj kev hloov pauv hauv cov yam ntxwv ntawm lub teeb nthwv dej ntawm cov crystal, thiab kev hloov pauv ntawm theem, amplitude, intensity thiab polarization xeev ntawm lub teeb liab optical tau paub.

Daim Duab: Kev teeb tsa ib txwm ntawm EOM tsav tsheb circuit

3. Semiconductor Optical Modulator / Semiconductor optical amplifier (SOM / SOA)

Lub tshuab hluav taws xob semiconductor optical amplifier (SOA) feem ntau yog siv rau kev ua kom lub teeb liab optical amplification, uas muaj qhov zoo ntawm cov chip, kev siv hluav taws xob tsawg, kev txhawb nqa rau txhua bands, thiab lwm yam, thiab yog lwm txoj hauv kev yav tom ntej rau cov amplifiers optical ib txwm muaj xws li EDFA (Erbium-doped fiber amplifier). Ib lub semiconductor optical modulator (SOM) yog tib lub cuab yeej li lub semiconductor optical amplifier, tab sis txoj kev siv nws txawv me ntsis ntawm txoj kev siv nrog lub SOA amplifier ib txwm muaj, thiab cov cim qhia uas nws tsom mus rau thaum nws siv ua lub teeb modulator txawv me ntsis ntawm cov uas siv ua lub amplifier. Thaum siv rau kev ua kom lub teeb liab optical amplification, feem ntau muab lub zog tsav tsheb ruaj khov rau SOA kom ntseeg tau tias SOA ua haujlwm hauv thaj chaw linear; Thaum nws siv los hloov kho lub teeb liab optical, nws nkag mus rau cov teeb liab optical tas mus li rau SOA, siv cov hluav taws xob pulses los tswj lub zog tsav SOA, thiab tom qab ntawd tswj lub xeev tso zis SOA ua amplification / attenuation. Siv cov yam ntxwv ntawm SOA amplification thiab attenuation, hom kev hloov kho no tau maj mam siv rau qee qhov kev siv tshiab, xws li optical fiber sensing, LiDAR, OCT medical imaging thiab lwm yam teb. Tshwj xeeb tshaj yog rau qee qhov xwm txheej uas xav tau qhov ntim ntau, kev siv hluav taws xob thiab qhov sib piv ploj mus.

4. Laser ncaj qha modulation kuj tseem tuaj yeem modulate lub teeb liab optical los ntawm kev tswj hwm ncaj qha laser bias tam sim no, raws li pom hauv daim duab hauv qab no, 3 nanosecond pulse dav tau txais los ntawm kev ncaj qha modulation. Nws tuaj yeem pom tias muaj qhov nce siab thaum pib ntawm lub pulse, uas yog coj los ntawm kev so ntawm lub laser carrier. Yog tias koj xav tau lub pulse ntawm li 100 picoseconds, koj tuaj yeem siv qhov nce siab no. Tab sis feem ntau peb tsis xav kom muaj qhov nce siab no.

Sau ua ke

AOM yog qhov tsim nyog rau kev tso zis hluav taws xob kho qhov muag hauv ob peb watts thiab muaj lub luag haujlwm hloov zaus. EOM yog ceev, tab sis qhov nyuaj tsav yog siab thiab qhov sib piv ploj mus yog qis. SOM (SOA) yog qhov kev daws teeb meem zoo tshaj plaws rau GHz ceev thiab qhov sib piv ploj mus siab, nrog rau kev siv hluav taws xob tsawg, miniaturization thiab lwm yam ntxwv. Cov diodes laser ncaj qha yog qhov kev daws teeb meem pheej yig tshaj plaws, tab sis yuav tsum paub txog kev hloov pauv hauv cov yam ntxwv spectral. Txhua txoj kev hloov kho muaj nws tus kheej qhov zoo thiab qhov tsis zoo, thiab nws yog ib qho tseem ceeb kom nkag siab txog cov kev xav tau ntawm daim ntawv thov thaum xaiv ib txoj kev npaj, thiab paub txog qhov zoo thiab qhov tsis zoo ntawm txhua txoj kev npaj, thiab xaiv txoj kev npaj tsim nyog tshaj plaws. Piv txwv li, hauv kev faib tawm fiber ntau, AOM ib txwm yog qhov tseem ceeb, tab sis hauv qee qhov kev tsim qauv tshiab, kev siv SOA cov phiaj xwm loj hlob sai, hauv qee qhov cua liDAR cov phiaj xwm ib txwm siv ob-theem AOM, qhov kev tsim qauv tshiab txhawm rau txo tus nqi, txo qhov loj me, thiab txhim kho qhov sib piv ploj mus, SOA cov phiaj xwm raug saws txais. Hauv kev sib txuas lus, lub kaw lus ceev qis feem ntau txais yuav txoj kev hloov kho ncaj qha, thiab lub kaw lus ceev ceev feem ntau siv txoj kev hloov kho electro-optic.