Iyini "indandatho ye-cyclic fiber"? Ukwazi kangakanani ngayo?
Incazelo: Indandatho yefayibha yokukhanya lapho ukukhanya kungajikeleza khona izikhathi eziningi
Indandatho yefayibha ejikelezayo iyi-idivayisi ye-fiber opticlapho ukukhanya kungajikeleza khona izikhathi eziningi. Kusetshenziswa kakhulu ohlelweni lokuxhumana lwe-optical fiber olude. Ngisho noma ubude obulinganiselwei-fiber ebonakalayo, ukukhanya kwesignali kungadluliselwa emabangeni amade kakhulu ngokugoqa izikhathi eziningi. Lokhu kusiza ukutadisha imiphumela eyingozi kanye nokungalungi kokukhanya okuthinta ikhwalithi yokukhanya kwesignali.
Kubuchwepheshe be-laser, ama-loop e-cyclic fiber angasetshenziswa ukukala ububanzi bomugqa we-ai-laser, ikakhulukazi lapho ububanzi bomugqa buncane kakhulu (<1kHz). Lokhu kuyisandiso sendlela yokulinganisa ububanzi bomugqa we-self-heterodyne, engadingi i-laser eyengeziwe yokuthola isignali yokubhekisela kuyo, edinga ukusetshenziswa kwemicu emide yemodi eyodwa. Inkinga ngobuchwepheshe bokuthola i-self-heterodyne ukuthi ukubambezeleka kwesikhathi okudingekayo kufana nobubanzi bomugqa obufanayo, ukuze ububanzi bomugqa bube yi-kHz embalwa kuphela, futhi ngisho nangaphansi kwe-1kHz kudinga ubude obukhulu kakhulu befayibha.
Umfanekiso 1: Umdwebo weskimu wendandatho ye-fibre ejikelezayo.
Isizathu esiyisisekelo sokusebenzisa ama-fiber loops ukuthi i-fiber enobude obuphakathi inganikeza ukubambezeleka kwesikhathi eside ngoba ukukhanya kuhamba amajika amaningi ku-fiber. Ukuze kuhlukaniswe ukukhanya okudluliswa ngama-loops ahlukene, i-modulator ye-acousto-optic ingasetshenziswa ku-loop ukukhiqiza ukushintsha kwemvamisa ethile (isibonelo, i-100MHz). Ngenxa yokuthi lokhu kushintsha kwemvamisa kukhulu kakhulu kunobubanzi bomugqa, ukukhanya okuhambe inani elihlukile lamajika ku-loop kungahlukaniswa kusizinda semvamisa. Ku-umshini wokuthola izithombe, okwangempelaukukhanya kwe-laserkanye nokushaya kokukhanya ngemva kokushintsha kwemvamisa kungasetshenziswa ukukala ububanzi bomugqa.
Uma kungekho idivayisi yokukhulisa umsindo ku-loop, ukulahlekelwa ku-modulator ye-acousto-optic kanye ne-fiber kukhulu kakhulu, futhi amandla okukhanya azobola kakhulu ngemva kwezihibe eziningana. Lokhu kunciphisa kakhulu inani lezihibe lapho kulinganiswa ububanzi bomugqa. Ama-fibre amplifiers angangezwa ku-loop ukuze kuqedwe lo mkhawulo.
Kodwa-ke, lokhu kudala inkinga entsha: yize ukukhanya okudlula ekuphendukeni okuhlukene kuhlukile ngokuphelele, isignali yokushaya ivela kuma-photon ahlukene, okushintsha i-spectrum yokushaya iyonke. Indandatho ye-optical fiber ingaklanywa ngokunengqondo ukuze ivimbele ngempumelelo le miphumela. Okokugcina, ukuzwela kwe-cyclic fiber loop kunqunyelwe umsindo we-i-fibre amplifierKuyadingeka futhi ukucabangela ukungalungi kwe-fiber kanye nemigqa engeyona i-Lorentz ekucutshungulweni kwedatha.
Isikhathi sokuthunyelwe: Disemba 12-2023