Txheej txheem cej luam ntawm plaub hom modulators

Txheej txheem cej luam ntawm plaub hom modulators

Daim ntawv no qhia txog plaub txoj kev hloov pauv (hloov lub laser amplitude hauv nanosecond lossis subnanosecond time domain) uas feem ntau siv hauv fiber ntau laser tshuab. Cov no suav nrog AOM (acousto-optic modulation), EOM (electro-optic modulation), SOM /SOA(semiconductor light amplification kuj hu ua semiconductor modulation), thiabdirect laser modulation. Ntawm lawv, AOM,EOM, SOM belongs rau sab nraud modulation, los yog indirect modulation.

1. Acousto-optic Modulator (AOM)

Acousto-optic modulation yog cov txheej txheem ntawm lub cev uas siv cov nyhuv acousto-optic los thauj cov ntaub ntawv mus rau optical carrier. Thaum modulating, lub teeb liab hluav taws xob (amplitude modulation) yog thawj zaug siv rau electro-acoustic transducer, uas hloov cov teeb liab hluav taws xob mus rau hauv ultrasonic teb. Thaum lub teeb nthwv dej dhau los ntawm qhov nruab nrab acousto-optic, cov khoom siv kho qhov muag tau hloov kho thiab dhau los ua qhov siv zog modulated yoj nqa cov ntaub ntawv vim yog qhov kev ua ntawm acousto-optic.

2. Electro-optical Modulator(EOM)

Electro-optical modulator yog ib qho kev hloov kho uas siv cov teebmeem electro-optical ntawm qee yam electro-optical crystals, xws li lithium niobate crystals (LiNb03), GaAs crystals (GaAs) thiab lithium tantalate crystals (LiTa03). Cov nyhuv electro-optical yog tias thaum qhov hluav taws xob tau siv rau electro-optical siv lead ua, qhov refractive index ntawm electro-optical siv lead ua yuav hloov, uas ua rau cov kev hloov nyob rau hauv lub teeb yoj yam ntxwv ntawm cov siv lead ua, thiab modulation ntawm theem, amplitude, siv zog thiab polarization lub xeev ntawm cov teeb liab kho qhov muag pom tau.

Daim duab: Ib qho kev teeb tsa ntawm EOM tsav tsheb Circuit Court

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

Semiconductor optical amplifier (SOA) feem ntau yog siv rau optical teeb liab amplification, uas muaj qhov zoo ntawm nti, tsis muaj zog noj, kev txhawb nqa rau tag nrho cov bands, thiab lwm yam., thiab yog ib tug yav tom ntej lwm txoj rau ib txwm optical amplifiers xws li EDFA (Erbium-doped fiber ntau amplifier). Lub semiconductor optical modulator (SOM) yog tib yam li ib qho khoom siv hluav taws xob semiconductor optical amplifier, tab sis txoj kev siv nws txawv me ntsis ntawm txoj kev uas nws siv nrog ib txwm siv SOA amplifier, thiab cov ntsuas nws tsom rau thaum nws siv los ua ib qho khoom siv hluav taws xob. Lub teeb modulator yog txawv me ntsis ntawm cov uas siv los ua ib qho amplifier. Thaum siv rau optical teeb liab amplification, ib tug ruaj khov tsav tam sim no feem ntau yog muab rau SOA los xyuas kom meej tias SOA ua hauj lwm nyob rau hauv lub linear cheeb tsam; Thaum nws yog siv los hloov kho qhov muag pulses, nws inputs nruam kho qhov muag teeb liab mus rau SOA, siv hluav taws xob pulses los tswj lub SOA tsav tam sim no, thiab ces tswj lub SOA tso zis lub xeev raws li amplification / attenuation. Siv SOA amplification thiab attenuation yam ntxwv, qhov kev hloov kho no tau maj mam muab siv rau qee qhov kev siv tshiab, xws li kev pom fiber ntau, LiDAR, OCT kev kho mob duab thiab lwm yam. Tshwj xeeb tshaj yog rau qee qhov xwm txheej uas yuav tsum muaj qhov ntim siab, kev siv hluav taws xob thiab kev ploj tuag.

4. Laser ncaj qha kev hloov kho kuj tseem tuaj yeem hloov kho qhov teeb meem kho qhov muag los ntawm kev tswj cov laser ncaj qha tam sim no, raws li qhia hauv daim duab hauv qab no, 3 nanosecond mem tes dav yog tau los ntawm kev hloov kho ncaj qha. Nws tuaj yeem pom tau tias muaj qhov sib npaug ntawm qhov pib ntawm cov mem tes, uas yog coj los ntawm kev so ntawm lub laser cab kuj. Yog tias koj xav tau cov mem tes txog li 100 picoseconds, koj tuaj yeem siv qhov no spike. Tab sis feem ntau peb tsis xav kom muaj qhov spike no.

Muab xam

AOM yog tsim rau optical fais fab tso zis nyob rau hauv ob peb watts thiab muaj ib tug zaus ua haujlwm. EOM yog nrawm, tab sis qhov nyuaj tsav yog siab thiab qhov kev ploj tuag tsawg. SOM (SOA) yog qhov kev daws teeb meem zoo tshaj plaws rau GHz ceev thiab siab extinction piv, nrog tsawg zog noj, miniaturization thiab lwm yam nta. Direct laser diodes yog cov tshuaj pheej yig tshaj plaws, tab sis yuav tsum paub txog cov kev hloov pauv ntawm cov yam ntxwv spectral. Txhua lub tswv yim kev hloov kho muaj nws 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 lub tswv yim, thiab paub txog qhov zoo thiab qhov tsis zoo ntawm txhua lub tswv yim, thiab xaiv cov tswv yim tsim nyog tshaj plaws. Piv txwv li, nyob rau hauv kev faib fiber ntau sensing, cov tsoos AOM yog lub ntsiab, tab sis nyob rau hauv ib co tshiab system tsim, siv SOA schemes yog loj hlob sai heev, nyob rau hauv ib co cua liDAR schemes siv ob-theem AOM, lub tswv yim tshiab tsim nyob rau hauv thiaj li yuav. txo tus nqi, txo qhov loj me, thiab txhim kho qhov kev ploj tuag, SOA cov tswv yim tau txais yuav. Hauv kev sib txuas lus, qhov qis qis feem ntau yog siv cov qauv kev hloov pauv ncaj qha, thiab qhov kev kub ceev feem ntau siv cov txheej txheem electro-optic modulation.