Yini isilawuli se-fiber polarization?

Yini isilawuli se-fiber polarization?
Incazelo: Idivayisi ekwazi ukulawula isimo sokukhanya kwe-polarization kumafiber optical. Abaningiamadivaysi e-fiber optic, njengama-interferometers, adinga ikhono lokulawula isimo se-polarization sokukhanya ku-fiber. Ngakho-ke, izinhlobo ezahlukene zezilawuli ze-fiber polarization zenziwe.
Isilawuli sendlebe yelulwane ku-fiber optical egobile
A commonisilawuli se-polarizationitholakala ngokugoba (noma ukusonga) imicu yokubona ukuze kutholakale i-birefringence. Isamba sokubambezeleka (usayizi we-birefringence) silingana nobude befayibha futhi sihambisana ngokuphambene nerediyasi egobayo. Ibuye ihlobane nohlobo lwefiber optical. Kwezinye izimo, i-optical fiber ingalinyazwa izikhathi ezimbalwa ngeradiyasi ethile yokugoba ukuze kutholwe ukubambezeleka kuka-λ/2 noma λ/4.

Umfanekiso 1: Isilawuli se-bat ear polarization, esihlanganisa amakhoyili amathathu e-fiber optic akwazi ukuzungezisa i-eksisi yefiber yesigameko.
Ngokuvamile, amakhoyili amathathu asetshenziswa ukwenza ikholomu, ikhoyili ephakathi ibe yisigamu sepuleti lamagagasi bese izinhlangothi ezimbili njengamapuleti wamagagasi ekota. Ikhoyili ngayinye ingazungeza eduze kwe-eksisi yesigameko kanye nemicu yokubona ephumayo. Ngokulungisa ukuma kwamakhoyili amathathu, isimo se-polarization se-wavelength ethile yesigameko singaguqulelwa kunoma yisiphi isimo sokukhishwa kwe-polarization. Kodwa-ke, umthelela ku-polarization nawo uhlobene nobude begagasi. Emandleni aphezulu aphezulu (ngokuvamile okwenzeka kuma-ultra short pulses), ukujikeleza kwe-polarization okungeyona imigqa kwenzeka. Ububanzi bekhoyili ye-fiber optic abukwazi ukuba buncane kakhulu, ngaphandle kwalokho ukugoba kuzongenisa ukulahlekelwa okwengeziwe kokugoba. Olunye uhlobo oluminyene kakhulu, futhi oluzwela kancane kokungaqondile, lisebenzisa i-birefringence eqinile (ukugcinwa kwe-polarization) yama-optical fibers kune-fiber coil.
IcindezelweI-Fiber Polarization Controller
Kukhona idivayisi engathola ama-waveplates aguquguqukayo, angacindezela ubude bemicu yokubona ngokwezinga elithile ngaphansi kwengcindezi ehlukahlukene. Ngokuzungezisa kancane kancane futhi ucindezele i-fiber optical ezungeze i-axis yayo, futhi uyibambe ebangeni elithile ukusuka esigabeni sokuminyanisa, noma yisiphi isimo sokukhishwa kwe-polarization singatholakala. Eqinisweni, ukusebenza okufanayo njengesinxephezelo se-Babinet Soleil (uhlobo lwenqwabaidivayisi yokubonaequkethe ama-birefringent wedges) ingatholakala, nakuba izimiso zabo zokusebenza zihlukile. Izikhundla zokucindezela eziningi zingasetshenziswa, lapho ukucindezela kuphela, hhayi i-engeli yokujikeleza, kushintsha. Izinguquko zokucindezela ngokuvamile zifinyelelwa kusetshenziswa ama-piezoelectric transducers. Le divayisi ingasebenza futhi njenge-polarizer, lapho i-piezoelectric iqhutshwa amafrikhwensi ahlukene noma amasignali angahleliwe.