Chidule cha ma modulators anayi omwe wamba

Chidule cha ma modulators anayi omwe wamba

Pepalali likuwonetsa njira zinayi zosinthira (kusintha matalikidwe a laser mu nanosecond kapena subnanosecond time domain) omwe amagwiritsidwa ntchito kwambiri pamakina a fiber laser. Izi zikuphatikiza AOM (acousto-optic modulation), EOM (electro-optic modulation), SOM/SOA(kukulitsa kuwala kwa semiconductor komwe kumadziwikanso kuti semiconductor modulation), ndikusinthasintha kwa laser mwachindunji. Mwa iwo, AOM,EOM,SOM ndi ya kusinthasintha kwakunja, kapena kusinthasintha kosalunjika.

1. Acousto-optic Modulator (AOM)

Acousto-optic modulation ndi njira yakuthupi yomwe imagwiritsa ntchito ma acousto-optic kuti ikweze zambiri pa chonyamulira cha kuwala. Mukasintha, chizindikiro chamagetsi (kusinthasintha kwa matalikidwe) chimagwiritsidwa ntchito koyamba kwa electro-acoustic transducer, yomwe imasintha chizindikiro chamagetsi kukhala gawo la akupanga. Pamene mafunde a kuwala akudutsa mu sing'anga ya acousto-optic, chonyamulira cha kuwala chimasinthidwa ndikukhala mphamvu yosinthika yonyamula zidziwitso chifukwa chakuchita kwa acousto-optic.

2. Electro-optical Modulator(EOM)

Electro-optical modulator ndi modulator yomwe imagwiritsa ntchito electro-optical zotsatira za makristasi ena a electro-optical, monga lithiamu niobate crystals (LiNb03), makristasi a GaAs (GaAs) ndi makristasi a lithiamu tantalate (LiTa03). Mphamvu ya electro-optical ndi yakuti pamene magetsi akugwiritsidwa ntchito pa electro-optical crystal, chiwerengero cha refractive cha electro-optical crystal chidzasintha, zomwe zimabweretsa kusintha kwa mawonekedwe a kuwala kwa kristalo, ndi kusintha kwa gawolo, matalikidwe, mphamvu ndi polarization boma la kuwala chizindikiro anazindikira.

Chithunzi: Kusintha kwanthawi zonse kwa EOM driver circuit

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

Semiconductor optical amplifier (SOA) nthawi zambiri amagwiritsidwa ntchito pokulitsa chizindikiro cha kuwala, chomwe chili ndi ubwino wa chip, kugwiritsa ntchito mphamvu zochepa, kuthandizira magulu onse, etc.Erbium-doped fiber amplifier). Semiconductor optical modulator (SOM) ndi chipangizo chofanana ndi semiconductor optical amplifier, koma njira yomwe imagwiritsidwa ntchito ndi yosiyana pang'ono ndi momwe imagwiritsidwira ntchito ndi chikhalidwe cha SOA amplifier, ndi zizindikiro zomwe zimayang'ana pamene zikugwiritsidwa ntchito ma modulator opepuka ndi osiyana pang'ono ndi omwe amagwiritsidwa ntchito ngati amplifier. Pogwiritsidwa ntchito pakukweza chizindikiro cha kuwala, kuyendetsa galimoto yokhazikika nthawi zambiri kumaperekedwa kwa SOA kuonetsetsa kuti SOA imagwira ntchito m'dera lozungulira; Ikagwiritsidwa ntchito kuwongolera ma pulses optical, imalowetsa ma sign optical mosalekeza ku SOA, imagwiritsa ntchito ma pulses amagetsi kuti azitha kuyendetsa SOA pakali pano, kenako ndikuwongolera SOA yotulutsa ngati kukulitsa / kuchepetsa. Pogwiritsa ntchito mawonekedwe a SOA amplification ndi attenuation, mawonekedwe osinthikawa agwiritsidwa ntchito pang'onopang'ono kuzinthu zina zatsopano, monga optical fiber sensing, LiDAR, kujambula kwachipatala kwa OCT ndi zina. Makamaka pazochitika zina zomwe zimafuna kuchuluka kwamphamvu, kugwiritsa ntchito mphamvu komanso kutha kwa chiŵerengero.

4. Kusintha kwachindunji kwa laser kungathenso kusinthira chizindikiro cha kuwala mwa kuwongolera mwachindunji laser bias panopa, monga momwe tawonetsera pa chithunzi pansipa, 3 nanosecond pulse wide imapezeka kupyolera mwa kusintha kwachindunji. Zitha kuwoneka kuti pali spike kumayambiriro kwa kugunda, komwe kumabweretsedwa ndi kupumula kwa chonyamulira cha laser. Ngati mukufuna kugunda pafupifupi 100 picoseconds, mutha kugwiritsa ntchito spike iyi. Koma nthawi zambiri sitifuna kukhala ndi spike iyi.

Chidule mwachidule

AOM ndiyoyenera kutulutsa mphamvu zamagetsi mu ma watts ochepa ndipo imakhala ndi ntchito yosinthira pafupipafupi. EOM ndi yachangu, koma zovuta zamagalimoto ndizokwera ndipo chiŵerengero cha kutha ndi chochepa. SOM (SOA) ndiye njira yabwino yothetsera liwiro la GHz ndi chiŵerengero cha kutha kwakukulu, ndikugwiritsa ntchito mphamvu zochepa, miniaturization ndi zina. Direct laser diodes ndi njira yotsika mtengo kwambiri, koma dziwani za kusintha kwa mawonekedwe a spectral. Chiwembu chilichonse chosinthira chimakhala ndi zabwino zake komanso zovuta zake, ndipo ndikofunikira kumvetsetsa bwino zomwe zimafunikira pakusankha chiwembu, ndikudziwa zabwino ndi zovuta za chiwembu chilichonse, ndikusankha chiwembu choyenera kwambiri. Mwachitsanzo, mu kugawidwa kwa fiber sensing, chikhalidwe cha AOM ndicho chachikulu, koma m'mapangidwe ena atsopano, kugwiritsa ntchito njira za SOA zikukula mofulumira, mu mphepo zina zamtundu wa liDAR zimagwiritsa ntchito magawo awiri AOM, mapangidwe atsopano kuti athe kuchepetsa mtengo, kuchepetsa kukula, ndi kukonza chiŵerengero cha kutha, ndondomeko ya SOA imatengedwa. Mu njira yolumikizirana, makina othamanga otsika nthawi zambiri amatenga njira yosinthira mwachindunji, ndipo makina othamanga kwambiri nthawi zambiri amagwiritsa ntchito pulogalamu ya electro-optic modulation.