Imodulator ye-Acousto-optic: Ukusetyenziswa kwiikhabhathi zeathomu ezibandayo
Njengenxalenye ephambili yekhonkco le-laser ye-all-fiber kwikhabhathi ye-atom ebandayo,i-modulator ye-acousto-optic yefayibha ye-opticiza kubonelela nge-laser enamandla aphezulu ezinzileyo kwikhabhinethi ye-atom ebandayo. Ii-athomu ziya kutsala ii-photon nge-frequency evakalayo ye-v1. Ekubeni isantya se-photon kunye nee-athomu sichasene, isantya see-athomu siya kuncipha emva kokufunxa ii-photon, ngaloo ndlela kufezekiswa injongo yokupholisa ii-athomu. Ii-athomu ezipholileyo nge-laser, kunye neenzuzo zazo ezifana nexesha elide lokuphanda, ukususwa kokutshintsha kwe-Doppler frequency kunye nokutshintsha kwe-frequency okubangelwa kukungqubana, kunye nokudibanisa okubuthathaka kwentsimi yokukhanya kokufumanisa, kuphucula kakhulu amandla okulinganisa ngokuchanekileyo kwee-athomu kwaye kunokusetyenziswa ngokubanzi kwiiwotshi ze-athomu ezibandayo, ii-interferometers ze-athomu ezibandayo, kunye nokuhamba kwe-athomu ebandayo, phakathi kwezinye iindawo.
Ingaphakathi le-AOM acousto-optic fiber modulator ikakhulu ine-acousto-optic crystal kunye ne-optical fiber collimator, njl. I-modulated signal isebenza kwi-piezoelectric transducer ngendlela yesignali yombane (i-amplitude modulation, i-phase modulation okanye i-frequency modulation). Ngokutshintsha iimpawu zokufaka ezifana ne-frequency kunye ne-amplitude yesignali eguquliweyo yokungenisa, i-frequency kunye ne-amplitude modulation ye-input laser ziyafezekiswa. I-piezoelectric transducer iguqula imiqondiso yombane ibe yimiqondiso ye-ultrasonic eyahluka ngendlela efanayo ngenxa yesiphumo se-piezoelectric kwaye isasaze kwi-acousto-optic medium. Emva kokuba i-refractive index ye-acousto-optic medium itshintsha rhoqo, kwenziwa i-refractive index grating. Xa i-laser idlula kwi-fiber collimator kwaye ingena kwi-acousto-optic medium, i-diffraction iyenzeka. I-frequency yokukhanya okudityanisiweyo ibeka i-ultrasonic frequency kwi-input laser frequency yokuqala. Lungisa indawo ye-optical fiber collimator ukuze i-optical fiber acoust-optic modulator isebenze kakuhle. Ngeli xesha, i-engile yesiganeko sokukhanya kwesiganeko kufuneka yanelise imeko ye-Bragg diffraction, kwaye imo ye-diffraction kufuneka ibe yi-Bragg diffraction. Ngeli xesha, phantse onke amandla okukhanya kwesiganeko adluliselwa kwisibane se-diffraction somyalelo wokuqala.
I-modulator yokuqala ye-AOM acouto-optic isetyenziswa kwisiphelo esingaphambili se-optical amplifier yenkqubo, ilawula ukukhanya okungenayo okuqhubekayo ukusuka kwisiphelo esingaphambili ngee-optical pulses. Ii-modulated optical pulses emva koko zingena kwi-optical amplification module yenkqubo ukuze kuphuculwe amandla. EyesibiniImodulator ye-acouto-optic ye-AOMIsetyenziswa ngasemva kwe-optical amplifier, kwaye umsebenzi wayo kukwahlula ingxolo esisiseko yesignali ye-optical pulse eyandisiweyo yinkqubo. Imiphetho yangaphambili nangasemva yee-light pulses ezikhutshwa yi-AOM acouto-optic modulator yokuqala isasazwa ngokulinganayo. Emva kokungena kwi-optical amplifier, ngenxa yokuba i-amplifier ye-pulse leading edge iphezulu kuneyo ye-pulse trailing edge, ii-amplified light pulses ziya kubonisa i-waveform distortion phenomenon apho amandla agxininiswe kumphetho ophambili, njengoko kubonisiwe kuMfanekiso 3. Ukuze inkqubo ikwazi ukufumana ii-optical pulses ezinosasazo olulinganayo kumphetho ongaphambili nongasemva, i-AOM acouto-optic modulator yokuqala kufuneka isebenzise i-analog modulation. Iyunithi yolawulo lwenkqubo ilungisa umda onyukayo we-AOM acouto-optic modulator yokuqala ukuze yonyuse umda onyukayo we-optical pulse ye-acoust-optic module kwaye ihlawulele ukungahambelani kwe-optical amplifier kumphetho ongaphambili nongasemva we-pulse.
I-optical amplifier yenkqubo ayigcini nje ngokwandisa imiqondiso ye-optical pulse eluncedo, kodwa ikwakhulisa ingxolo esisiseko yolandelelwano lwe-pulse. Ukuze kufezekiswe umlinganiselo ophezulu wesignali-kwingxolo yenkqubo, uphawu lomlinganiselo ophezulu wokuphela kwe-optical fiber.Imodulator ye-AOMIsetyenziselwa ukucinezela ingxolo yesiseko kwisiphelo esingasemva se-amplifier, ukuqinisekisa ukuba ii-pulses zesignali yenkqubo zinokudlula ngokufanelekileyo kwinqanaba eliphezulu ngelixa zithintela ingxolo yesiseko ukuba ingangeni kwi-acousto-optic shutter yexesha-domain (i-time-domain pulse gate). Indlela ye-digital modulation iyasetyenziswa, kwaye i-TTL level signal isetyenziselwa ukulawula ukuvulwa nokucinywa kwe-acoust-optic module ukuqinisekisa ukuba umda onyukayo we-time-domain pulse ye-acoust-optic module lixesha eliyilelweyo lokunyuka kwemveliso (oko kukuthi, ixesha elincinci lokunyuka elinokufumaneka yimveliso), kwaye ububanzi be-pulse buxhomekeke kububanzi be-pulse yesignali yenqanaba le-TTL yenkqubo.
Ixesha leposi: Julayi-01-2025