Yintoni "indandatho yefayibha ejikelezayo"? Unolwazi olungakanani ngayo?
Inkcazo: Isangqa sefayibha ye-optical apho ukukhanya kunokujikeleza khona amaxesha amaninzi
Isangqa sefayibha esijikelezayoisixhobo se-fiber opticapho ukukhanya kunokujikeleza khona amaxesha amaninzi. Isetyenziswa kakhulu kwinkqubo yonxibelelwano lwefayibha ye-optical ekude. Nokuba ubude bayo bulinganiselwe.ifayibha ye-optical, ukukhanya kwesiginali kunokudluliselwa kumgama omde kakhulu ngokujika amaxesha amaninzi. Oku kunceda ekufundeni iziphumo ezinobungozi kunye nokungahambelani kokukhanya kweginali okuchaphazela umgangatho wokukhanya.
Kwiteknoloji yelaser, ii-cyclic fiber loops zingasetyenziselwa ukulinganisa ububanzi bomgcaileza, ingakumbi xa ububanzi bomgca buncinci kakhulu (<1kHz). Olu lolwandiso lwendlela yokulinganisa ububanzi bomgca we-self-heterodyne, engadingi i-laser eyongezelelweyo yokufumana isignali yesalathiso kuyo, efuna ukusetyenziswa kweefayibha ezinde zemowudi enye. Ingxaki ngetekhnoloji yokubona i-self-heterodyne kukuba ukulibaziseka kwexesha okufunekayo kufana nobubanzi bomgca obufanayo, ngoko ke ububanzi bomgca buyi-kHz ezimbalwa kuphela, kwaye nangaphantsi kwe-1kHz kufuna ubude obukhulu befayibha.
Umfanekiso 1: Umzobo weskemakhi weringi yefayibha ejikelezayo.
Isizathu esisisiseko sokusebenzisa ii-fiber loops kukuba i-fiber enobude obuphakathi inokubonelela ngokulibaziseka kwexesha elide kuba ukukhanya kuhamba ii-turns ezininzi kwi-fiber. Ukuze kwahlulwe ukukhanya okudluliselwe kwii-loops ezahlukeneyo, i-acousto-optic modulator ingasetyenziswa kwi-loop ukuvelisa i-frequency shift ethile (umzekelo, i-100MHz). Ngenxa yokuba olu tshintsho lwee-frequency lukhulu kakhulu kunobubanzi bomgca, ukukhanya okuhambe inani elahlukileyo lee-turns kwi-loop kunokwahlulwa kwi-frequency domain. Kwi-isixhobo sokubona iifoto, eyantlandloloisibane selaserkwaye ukubetha kokukhanya emva kokutshintsha kwamaza kungasetyenziselwa ukulinganisa ububanzi bomgca.
Ukuba akukho sixhobo sokukhulisa kwiluphu, ilahleko kwimodulator ye-acousto-optic kunye nefayibha inkulu kakhulu, kwaye amandla okukhanya aya kubola kakhulu emva kweeluphu ezininzi. Oku kunciphisa kakhulu inani leeluphu xa kulinganiswa ububanzi bomgca. Ii-fibre amplifiers zingongezwa kwiluphu ukuze kupheliswe lo mda.
Nangona kunjalo, oku kudala ingxaki entsha: nangona ukukhanya okudlula kwiindlela ezahlukeneyo kwahlukile ngokupheleleyo, isignali yokubetha ivela kwiipaya ezahlukeneyo zeephoton, ezitshintsha i-spectrum yokubetha iyonke. Indandatho yefayibha ye-optical inokuyilwa ngokufanelekileyo ukuze ithintele ngempumelelo ezi ziphumo. Okokugqibela, uvakalelo lwe-cyclic fiber loop luthintelwe yingxolo yei-amplifier yefayibhaKwakhona kuyimfuneko ukuqwalasela ukungangqamani kwefayibha kunye nemigca engeyiyo iLorentz ekucwangcisweni kwedatha.
Ixesha lokuthumela: Disemba-12-2023