Classification ndi modulation scheme of laser modulator

Classification ndi modulation scheme of laser modulator

Laser modulatorndi mtundu wa zida zowongolera za laser, sizoyambira ngati makhiristo, magalasi ndi zida zina, komanso zophatikizika kwambiri ngati ma lasers,zida za laser, ndi digiri yapamwamba ya kuphatikiza, mitundu ndi ntchito za chipangizo kalasi mankhwala. Kuchokera pamawu ovuta a kuwala kwa kuwala, zikhoza kuwoneka kuti zinthu zomwe zimakhudza kuwala kwa kuwala ndi mphamvu A (r), gawo Φ (r), mafupipafupi ω ndi mbali zinayi za njira yofalitsa, poyang'anira zinthuzi zimatha kusintha mawonekedwe a kuwala kwa kuwala, laser modulator yogwirizana ndimphamvu modulator, gawo modulator, frequency shifter ndi deflector.

1. Intensity modulator: yomwe imagwiritsidwa ntchito posinthira mphamvu kapena matalikidwe a laser, omwe ma optical attenuators, zipata za kuwala ndizoyimilira kwambiri, komanso zida zophatikizika ndi zida monga zogawanitsa nthawi, zolimbitsa mphamvu, zoletsa phokoso.

2. Gawo modulator: amagwiritsidwa ntchito kuwongolera gawo la mtengo, kuwonjezeka kwa gawo kumatchedwa lag, kuchepa kwa gawo kumatchedwa lead. Pali mitundu yambiri ya ma modulators agawo, ndipo mfundo zawo zogwirira ntchito ndizosiyana kwambiri, monga ma photoelastic modulators, LN high-speed electro-optical phase modulators, liquid crystal variable phase modulators, etc., onse ndi ma modulators gawo kutengera mfundo zosiyanasiyana zogwirira ntchito.

3. Frequency shifter: yomwe imagwiritsidwa ntchito posintha mafunde a kuwala, imagwiritsidwa ntchito kwambiri pamakina apamwamba a laser kapena zida zamapu, ndi acousto-optical frequency shifter ngati woyimira wamba.

4. Deflector: ntchito kusintha malangizo a mtengo kafalitsidwe, ochiritsira galvanometer dongosolo ndi mmodzi wa iwo, kuwonjezera mofulumira mems galvanometer, elekitirodi kuwala deflector ndi acousto-optical deflector.

Tili ndi lingaliro wamba la laser modulator, ndiye kuti, zigawo zomwe zimatha kuwongolera mwamphamvu ndikusintha mawonekedwe ena amtundu wa laser, koma tikufuna kufotokozera momveka bwino zopangidwa ndi laser modulator, nkhani yokhayo ndiyokwanira. Chifukwa chake, choyamba, yang'anani pamphamvu modulator. Intensity modulator ngati mtundu wa modulator womwe umagwiritsidwa ntchito kwambiri mumitundu yonse yamagetsi owoneka bwino, mitundu yake, magwiridwe antchito osiyanasiyana amatha kufotokozedwa kuti ndizovuta, lero kukudziwitsani njira zinayi zodziwika bwino zama modulator: chiwembu chamakina, chiwembu cha electro-optic, chiwembu cha acousto-optic ndi chiwembu chamadzimadzi.

1. Chiwembu chamakina: makina opangira mphamvu zamakina ndi njira yoyambira kwambiri komanso yogwiritsidwa ntchito kwambiri. Mfundo yake ndikusintha chiŵerengero cha s kuwala ndi p kuwala mu kuwala kwa polarized pozungulira mbale ya theka-wave, ndi kugawa kuwala ndi polarizer. Kuchokera pakusintha koyambira pamanja mpaka masiku ano zodziwikiratu kwambiri komanso zolondola kwambiri, mitundu yake yazogulitsa ndi kakulidwe ka ntchito zakhala zokhwima kwambiri.

2. Electro-optical scheme: electro-optical intensity modulator ingasinthe mphamvu kapena matalikidwe a kuwala kwa polarized, mfundoyi imachokera ku Pockels zotsatira za electro-optical crystals. Mkhalidwe wa polarization wa mtengo wa polarized umasintha pambuyo pa kristalo wa electro-optic ndi munda wamagetsi, ndiyeno polarization imagawidwa mosankhidwa ndi polarizer. Kuchuluka kwa kuwala komwe kumachokera kungathe kuyendetsedwa mwa kusintha mphamvu ya magetsi, ndipo kukwera / kugwa kwa ns kukula kungathe kufika.

3. Chiwembu cha acousto-optic: acousto-optic modulator ingagwiritsidwenso ntchito ngati modulator mwamphamvu. Posintha mphamvu ya diffraction, mphamvu ya kuwala kwa 0 ndi kuwala kwa 1 imatha kuwongoleredwa kuti ikwaniritse cholinga chosinthira mphamvu ya kuwala. Chipata cha Acoustooptic (optical attenuator) chili ndi mawonekedwe a liwiro losinthasintha komanso kuwonongeka kwakukulu.

4 Liquid crystal solution: liquid crystal device nthawi zambiri imagwiritsidwa ntchito ngati mbale yosinthika kapena fyuluta yowonongeka, pogwiritsira ntchito magetsi oyendetsa galimoto pamapeto onse a bokosi lamadzimadzi lamadzimadzi kuti awonjezerepo polarization, akhoza kupangidwa kukhala chotsekera chamadzimadzi kapena chosinthira chosinthira, mankhwalawa ali ndi kabowo kakang'ono kamene kali ndi kuwala, kudalirika kwakukulu.