Bayanin na'urori masu daidaitawa guda huɗu

Bayanin na'urori masu daidaitawa guda huɗu

Wannan takarda ta gabatar da hanyoyin daidaitawa guda huɗu (canza girman girman laser a cikin nanosecond ko yankin lokaci na subnanosecond) waɗanda aka fi amfani da su a cikin tsarin laser fiber. Waɗannan sun haɗa da AOM (modulation acousto-optic), EOM (modulation na lantarki), SOM/SOA(haɓakar haske na semiconductor wanda kuma aka sani da daidaitawa na semiconductor), dakai tsaye Laser daidaitawa. Daga cikin su, AOM.EOM, SOM na cikin tsarin daidaitawa na waje, ko daidaitawa kai tsaye.

1. Acousto-optic Modulator (AOM)

Modulation na Acousto-optic wani tsari ne na zahiri wanda ke amfani da tasirin acousto-optic don loda bayanai akan mai ɗaukar hoto. Lokacin daidaitawa, siginar wutar lantarki (amplitude modulation) ana fara fara amfani da shi zuwa mai jujjuyawar wutar lantarki, wanda ke canza siginar lantarki zuwa filin ultrasonic. Lokacin da igiyar haske ta wuce ta hanyar acousto-optic, mai ɗaukar hoto yana daidaitawa kuma ya zama igiyar motsi mai ƙarfi tana ɗauke da bayanai saboda aikin acousto-optic.

2. Electro-Optical Modulator(EOM)

Electro-Optical modulator shine modulator wanda ke amfani da tasirin electro-optical na wasu lu'ulu'u na lantarki, kamar lithium niobate crystals (LiNb03), lu'ulu'u na GaAs (GaAs) da lithium tantalate crystals (LiTa03). Tasirin electro-optical shine cewa lokacin da aka yi amfani da wutar lantarki zuwa kristal na lantarki, ma'anar refractive na electro-optical crystal za ta canza, wanda zai haifar da canje-canje a cikin halayen hasken haske na crystal, da kuma daidaitawar lokaci, amplitude, tsanani da polarization yanayin siginar gani.

Hoto: Tsari na yau da kullun na da'irar direba na EOM

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

Semiconductor Optical Amplifier (SOA) yawanci ana amfani dashi don haɓaka siginar gani, wanda ke da fa'idodin guntu, ƙarancin amfani da wutar lantarki, tallafi ga duk makada, da sauransu, kuma shine madadin gaba ga na'urori masu gani na gani na gargajiya kamar EDFA (erbium-doped fiber amplifier). Semiconductor Optical Modulator (SOM) na'ura iri daya ce da na'urar da ake amfani da ita, amma yadda ake amfani da shi ya dan bambanta da yadda ake amfani da shi da na'urar ta SOA ta gargajiya, kuma ma'aunin da yake mayar da hankali a kai idan aka yi amfani da shi a matsayin na'urar modulator ya dan bambanta da wadanda ake amfani da su a matsayin amplifier. Lokacin da aka yi amfani da shi don haɓaka siginar gani, ana ba da kwanciyar hankali na halin yanzu ga SOA don tabbatar da cewa SOA na aiki a cikin yanki mai layi; Lokacin da aka yi amfani da shi don daidaita bugun jini na gani, yana shigar da ci gaba da siginar gani zuwa SOA, yana amfani da bugun wutar lantarki don sarrafa motsin SOA na yanzu, sannan sarrafa yanayin fitarwa na SOA azaman haɓakawa / attenuation. Yin amfani da haɓakar haɓakar SOA da halayen haɓakawa, an yi amfani da wannan yanayin a hankali zuwa wasu sabbin aikace-aikace, kamar firinta na gani, LiDAR, hoton likitancin OCT da sauran fannoni. Musamman ga wasu al'amuran da ke buƙatar ingantacciyar ƙarar girma, amfani da wutar lantarki da rabon ƙarewa.

4. Laser kai tsaye na daidaitawa zai iya daidaita siginar gani ta hanyar sarrafa halin yanzu na laser kai tsaye, kamar yadda aka nuna a cikin hoton da ke ƙasa, ana samun 3 nanosecond nisa bugun bugun jini ta hanyar daidaitawa kai tsaye. Ana iya ganin cewa akwai karu a farkon bugun jini, wanda aka kawo ta hanyar shakatawa na mai ɗaukar laser. Idan kuna son samun bugun jini na kusan picoseconds 100, zaku iya amfani da wannan karu. Amma yawanci ba ma son samun wannan karu.

Takaita

AOM ya dace da fitowar wutar lantarki a cikin ƴan watts kuma yana da aikin motsa mitoci. EOM yana da sauri, amma ƙwarewar tuƙi yana da girma kuma rabon ɓarna yana da ƙasa. SOM (SOA) shine mafi kyawun bayani don saurin GHz da ƙarancin ɓarna, tare da ƙarancin amfani da wutar lantarki, ƙaranci da sauran fasalulluka. Diodes laser kai tsaye shine mafita mafi arha, amma ku kula da canje-canje a cikin halaye na gani. Kowane tsarin daidaitawa yana da nasa fa'ida da rashin amfani, kuma yana da mahimmanci a fahimci ainihin buƙatun aikace-aikacen lokacin zabar tsari, kuma ku san fa'ida da rashin amfanin kowane tsari, kuma zaɓi tsarin da ya fi dacewa. Misali, a cikin fahimtar fiber da aka rarraba, AOM na gargajiya shine babban abu, amma a wasu sabbin ƙirar tsarin, amfani da tsarin SOA yana haɓaka cikin sauri, a cikin wasu tsare-tsaren gargajiya na iska liDAR suna amfani da AOM mai matakai biyu, sabon ƙirar ƙirar don rage farashin, rage girman, da haɓaka ƙimar ɓarna, tsarin SOA ya karɓi tsarin. A cikin tsarin sadarwa, tsarin ƙananan gudu yakan ɗauki tsarin daidaitawa kai tsaye, kuma tsarin babban gudun yana amfani da tsarin daidaitawa na lantarki.