Dab tsi yog fiber ntau polarization maub los?

Dab tsi yog fiber ntau polarization maub los?
Lus Txhais: Ib qho cuab yeej uas tuaj yeem tswj tau lub xeev polarization ntawm lub teeb hauv optical fibers. Ntaucov khoom siv fiber ntau optic, xws li interferometers, xav tau lub peev xwm los tswj lub xeev polarization ntawm lub teeb nyob rau hauv fiber. Yog li ntawd, ntau hom fiber ntau polarization controllers tau tsim.
Bat ear controller nyob rau hauv khoov optical fiber
Ib qhopolarization tswjyog ua tiav los ntawm khoov (los yog winding) optical fibers kom tau txais birefringence. Tag nrho ncua sij hawm (birefringence loj) yog proportional rau qhov ntev ntawm lub fiber thiab inversely proportional rau lub vojvoog dabtsi yog khoov. Nws kuj muaj feem xyuam rau hom fiber ntau optical. Qee zaum, cov khoom siv kho qhov muag tuaj yeem raug mob ntau zaus nrog lub vojvoog khoov tshwj xeeb kom tau txais kev ncua ntawm λ/2 lossis λ/4.

Daim duab 1: Bat pob ntseg polarization maub los, muaj peb fiber optic coils uas muaj peev xwm tig raws axis ntawm qhov teeb meem fiber ntau.
Feem ntau, peb coils yog siv los ua ib kem, nrog nruab nrab kauj raws li ib nrab nthwv dej phaj thiab ob sab raws li lub quarter yoj daim hlau. Txhua kauj tuaj yeem tig raws qhov axis ntawm qhov xwm txheej thiab cov khoom siv kho qhov muag tawm. Los ntawm kev kho cov kev taw qhia ntawm peb lub coils, lub xeev polarization ntawm ib lub wavelength tshwj xeeb ntawm qhov xwm txheej tuaj yeem hloov mus rau txhua qhov tso zis polarization xeev. Txawm li cas los xij, qhov cuam tshuam ntawm polarization tseem cuam tshuam nrog wavelength. Thaum lub zog siab siab (feem ntau tshwm sim hauv ultra luv pulses), nonlinear polarization rotation tshwm sim. Txoj kab uas hla ntawm cov fiber ntau optic coil tsis tuaj yeem me me dhau, txwv tsis pub dabtsi yog khoov yuav qhia txog kev poob qis ntxiv. Lwm hom compact dua, thiab tsis tshua muaj siab rau nonlinearity, siv lub zog birefringence (polarization preservation) ntawm optical fibers es tsis yog fiber ntau coils.
CompressedFiber Polarization Controller
Muaj ib lub cuab yeej uas tuaj yeem tau txais cov waveplate sib txawv, uas tuaj yeem ua rau qhov ntev ntawm cov fibers kho qhov muag mus rau qee qhov raws li qhov sib txawv. Los ntawm maj mam rotating thiab compressing lub optical fiber nyob ib ncig ntawm nws axis, thiab clamping nws ntawm ib tug tej yam deb ntawm lub compression seem, txhua yam tso zis polarization xeev yuav muab tau. Qhov tseeb, qhov ua tau zoo ib yam li Babinet Soleil compensator (ib hom ntaukhoom siv kho qhov muagmuaj ob lub voj voos birefringent) tuaj yeem tau txais, txawm tias lawv cov qauv kev ua haujlwm txawv. Ntau txoj haujlwm compression kuj tseem siv tau, qhov twg tsuas yog lub siab, tsis yog lub kaum sab xis, hloov pauv. Kev hloov siab feem ntau ua tiav siv piezoelectric transducers. Cov cuab yeej no tseem tuaj yeem ua tus polarizer, qhov twg lub piezoelectric yog tsav los ntawm ntau zaus los yog random signals.