Chidule cha ma modulators anayi ofanana

Chidule cha ma modulators anayi ofanana

Pepala ili likulongosola njira zinayi zosinthira (kusintha ma amplitude a laser mu nanosecond kapena subnanosecond time domain) zomwe zimagwiritsidwa ntchito kwambiri mu fiber laser systems. Izi zikuphatikizapo AOM (acousto-optic modulation), EOM (electro-optic modulation), SOM/SOA(kukulitsa kuwala kwa semiconductor komwe kumadziwikanso kuti semiconductor modulation), ndikusintha kwa laser mwachindunjiPakati pawo, AOM,EOM,SOM ndi ya kusintha kwakunja, kapena kusintha kosalunjika.

1. Chowongolera cha Acousto-optic (AOM)

Kusinthasintha kwa ma acousto-optic ndi njira yeniyeni yomwe imagwiritsa ntchito mphamvu ya acousto-optic kuti ikweze zambiri pa chonyamulira cha kuwala. Posintha, chizindikiro chamagetsi (kusinthasintha kwa amplitude) chimagwiritsidwa ntchito koyamba pa chosinthira cha electro-acoustic, chomwe chimasintha chizindikiro chamagetsi kukhala gawo la ultrasonic. Pamene mafunde owala adutsa mu acousto-optic medium, chonyamulira cha kuwala chimasinthidwa ndipo chimakhala chidziwitso chonyamula mafunde osinthika chifukwa cha ntchito ya acousto-optic.

2. Chowongolera chamagetsi ndi kuwala(EOM)

Modulator ya electro-optical ndi modulator yomwe imagwiritsa ntchito mphamvu ya electro-optical ya makristalo ena a electro-optical, monga makristalo a lithiamu niobate (LiNb03), makristalo a GaAs (GaAs) ndi makristalo a lithiamu tantalate (LiTa03). Mphamvu ya electro-optical ndi yakuti magetsi akagwiritsidwa ntchito pa kristalo ya electro-optical, chizindikiro cha refractive cha kristalo ya electro-optical chidzasintha, zomwe zimapangitsa kusintha kwa mawonekedwe a kuwala kwa kristalo, ndipo kusintha kwa gawo, amplitude, intensity ndi polarization state ya chizindikiro cha optical kumachitika.

Chithunzi: Kapangidwe kabwino ka dera loyendetsa la EOM

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

Semiconductor optical amplifier (SOA) nthawi zambiri imagwiritsidwa ntchito pokulitsa chizindikiro cha optical, chomwe chili ndi ubwino wa chip, kugwiritsa ntchito mphamvu zochepa, kuthandizira magulu onse, ndi zina zotero, ndipo ndi njira ina yamtsogolo m'malo mwa ma amplifier achikhalidwe monga EDFA (Chojambulira cha fiber chopangidwa ndi Erbium). Semiconductor optical modulator (SOM) ndi chipangizo chomwecho monga semiconductor optical amplifier, koma momwe imagwiritsidwira ntchito ndi yosiyana pang'ono ndi momwe imagwiritsidwira ntchito ndi amplifier yachikhalidwe ya SOA, ndipo zizindikiro zomwe zimayikidwa patsogolo zikagwiritsidwa ntchito ngati modulator yowala ndizosiyana pang'ono ndi zomwe zimagwiritsidwa ntchito ngati amplifier. Ikagwiritsidwa ntchito pokulitsa chizindikiro cha optical, nthawi zambiri imaperekedwa ku SOA kuti iwonetsetse kuti SOA ikugwira ntchito m'dera lolunjika; Ikagwiritsidwa ntchito kusintha ma pulse a optical, imalowetsa ma signal optical continuous ku SOA, imagwiritsa ntchito ma pulse amagetsi kuti ilamulire SOA drive current, kenako imayang'anira momwe SOA output state imakulitsira/kuchepetsa. Pogwiritsa ntchito SOA amplification and attenuation characteristics, modulation mode iyi yakhala ikugwiritsidwa ntchito pang'onopang'ono ku mapulogalamu ena atsopano, monga optical fiber sensing, LiDAR, OCT medical imaging ndi madera ena. Makamaka pazochitika zina zomwe zimafuna voliyumu yayikulu, kugwiritsa ntchito mphamvu ndi kutha kwa mphamvu.

4. Kusinthasintha kwa laser mwachindunji kungathenso kusintha chizindikiro cha kuwala mwa kuwongolera mwachindunji mphamvu ya laser bias, monga momwe chithunzi chili pansipa chikusonyezera, m'lifupi mwa 3 nanosecond pulse umapezeka kudzera mu direct modulation. Zikuoneka kuti pali spike kumayambiriro kwa pulse, yomwe imabwera chifukwa cha kupumula kwa chonyamulira laser. Ngati mukufuna kupeza pulse ya pafupifupi 100 picoseconds, mungagwiritse ntchito spike iyi. Koma nthawi zambiri sitikufuna kukhala ndi spike iyi.

Chidule

AOM ndi yoyenera kutulutsa mphamvu ya kuwala mu ma watts ochepa ndipo ili ndi ntchito yosintha pafupipafupi. EOM ndi yachangu, koma zovuta za drive ndizokwera ndipo chiŵerengero cha kutha kwa magetsi ndi chotsika. SOM (SOA) ndiye yankho labwino kwambiri la liwiro la GHz ndi chiŵerengero cha kutha kwa magetsi chachikulu, ndi kugwiritsa ntchito mphamvu zochepa, miniaturization ndi zina. Ma diode a laser olunjika ndiye yankho lotsika mtengo kwambiri, koma dziwani kusintha kwa mawonekedwe a spectral. Dongosolo lililonse la modulation lili ndi zabwino ndi zoyipa zake, ndipo ndikofunikira kumvetsetsa molondola zofunikira pakugwiritsa ntchito posankha dongosolo, ndikuzolowera zabwino ndi zoyipa za dongosolo lililonse, ndikusankha dongosolo loyenera kwambiri. Mwachitsanzo, mu kusanthula kwa ulusi wogawidwa, AOM yachikhalidwe ndiye yayikulu, koma m'mapangidwe ena atsopano amakina, kugwiritsa ntchito njira za SOA kukukula mwachangu, m'madongosolo ena achikhalidwe a wind liDAR amagwiritsa ntchito AOM ya magawo awiri, kapangidwe katsopano ka dongosolo kuti achepetse mtengo, achepetse kukula, ndikukweza chiŵerengero cha kutha kwa magetsi, dongosolo la SOA limatengedwa. Mu dongosolo lolumikizirana, dongosolo lotsika nthawi zambiri limagwiritsa ntchito njira yowongolera mwachindunji, ndipo dongosolo lothamanga kwambiri nthawi zambiri limagwiritsa ntchito njira yowongolera magetsi yamagetsi ...