Taw qhia rau polarization
Raws li lub teeb dhau los ntawm ib qho chaw hauv qhov chaw, cov kev taw qhia thiab qhov amplitude ntawm lub oscillating hluav taws xob teb mus raws txoj kev dhau sijhawm. Lub electromagnetic teb vector ntawm txoj cai kaum rau ib leeg nyob rau hauv ib tug transverse seem (ib lub dav hlau perpendicular rau cov kev taw qhia ua ntej) sawv cev rau ib tug polarized lub teeb yoj teeb liab. Lub polarization yog txhais los ntawm kev siv hluav taws xob teb vector raws li kev ua haujlwm ntawm lub sijhawm, raws li cov qauv taug qab hla ntu ntu. Polarization tuaj yeem muab faib ua linear, elliptic lossis ncig polarization, ntawm uas linear polarization yog qhov yooj yim tshaj plaws. Polarization ntawm txhua yam yog ib qho teeb meem nyob rau hauv fiber optic kis tau tus mob.
Txhua lub xov tooj cua sib txuas lus thiab kev ntsuas fiber ntau yog ib qho cuab yeej uas muaj peev xwm txheeb xyuas kev cuam tshuam ntawm ob hom teeb pom kev zoo. Peb tsis tuaj yeem siv cov ntaub ntawv muab los ntawm kev cuam tshuam tshwj tsis yog tias qhov amplitudes ntawm kev sib txuas ua ke nyob ruaj khov nyob rau lub sijhawm, uas yog, lub teeb tsis muaj nyob hauv tib lub xeev polarization. Nyob rau hauv cov ntaub ntawv no nws yog tsim nyog los siv optical fibers muaj peev xwm kis tau tus polarization ruaj khov xeev. Yog li thiaj li daws tau qhov teeb meem no,optical fibersuas muaj peev xwm tswj tau polarization tau tsim.
PM fiber ntau yog dab tsi?
Lub diffusion ntawm lub polarization ntawm lub teeb nyob rau hauv lub fiber ua uncontrolled (nyob ntawm seb lub wavelength) thiab nyob ntawm tej dabtsi yog khoov ntawm lub fiber thiab kub lub xeev. Cov khoom siv kho qhov muag tshwj xeeb yog xav tau kom ua tiav cov khoom siv kho qhov muag xav tau, uas cuam tshuam los ntawm polarization ntawm lub teeb thaum nws dhau los ntawm fiber ntau. Ntau lub tshuab, xws li fiber ntau interferometers thiab sensors, fiber ntau lasers, thiab electro-optical modulators, kuj muaj polarization-dependent poob uas cuam tshuam rau kev ua haujlwm. Qhov teeb meem no tuaj yeem daws tau los ntawm kev siv cov fibers tshwj xeeb hu ua PM fibers.
Txoj Cai ntawm PM Fiber
Yog hais tias lub polarization ntawm lub teeb emissions mus rau hauv lub fiber yog coaxial nrog ib tug birefringence axis, nws yuav nyob twj ywm li ntawd txawm tias lub fiber yog khoov. Raws li lub hauv paus ntsiab lus ntawm uniform hom coupling, lub hauv paus ntsiab lus ntawm lub cev tom qab qhov tshwm sim tuaj yeem nkag siab. Vim tias muaj qhov tshwm sim muaj zog birefringence, qhov kev nthuav tawm tsis tu ncua ntawm ob hom polarization sib txawv, yog li cov txheeb ze sib ntsib ntawm cov qauv kev koom tes zoo li drift sai. Yog li ntawd, tsuav yog muaj kev cuam tshuam ntawm lub teeb muaj qhov zoo ntawm Fourier tivthaiv (thiab tus naj npawb nthwv dej sib haum rau qhov sib txawv ntawm qhov kev nthuav tawm ntawm ob hom), nws tuaj yeem ua tau zoo sib xws rau ob hom. Yog tias qhov sib txawv loj txaus, qhov kev cuam tshuam dav dav hauv lub teeb yuav hloov maj mam thiab maj mam kom ua tiav hom kev sib txuas zoo. Yog li lub hauv paus ntsiab lus ntawm PM fiber ua qhov sib txawv txaus.
Ntawm cov kev siv ntau tshaj plaws ntawm kev sib txuas lus fiber ntau hauv qhov ntev, PM fiber ntau yog siv los qhia lub teeb ntawm ib qho chaw mus rau lwm qhov rau hauv lub xeev ntawm linear polarization. Yuav kom ua tiav qhov txiaj ntsig no, ntau yam yuav tsum tau ua. Cov tswv yim fiber ntau yuav tsum yog polarized heev kom tsis txhob kis qeeb axis thiab ceev axis hom, nyob rau hauv uas cov zis polarization xeev yog unpredictable.
Rau tib lub laj thawj, hluav taws xob teb hauvoptical fiber ntauyuav tsum tau ua raws li qhov tseeb thiab meej nrog lub ntsiab axis ntawm ib qho kev kho qhov muag fiber ntau (uas feem ntau yog cov axis qeeb hauv kev xyaum ua haujlwm). Yog hais tias PM fiber ntau txoj kab yog tsim los ntawm segmented fibers txuas nrog fiber ntau connectors los yog splicing pob qij txha, txuam fiber ntau rotation thiab positioning yog ib qho teeb meem tseem ceeb heev. Tsis tas li ntawd, lub connector yuav tsum tau muab ntsia rau ntawm PM fiber, thiab thaum lub sij hawm installation ntawm lub connector, lub internal stress generated yuav tsis ua rau cov hluav taws xob teb mus rau lub optical axis tsis siv nyob rau hauv lub fiber.
Kev siv ntawm PM fiber
PM fibers yog siv nyob rau hauv qhov chaw uas tsis muaj polarization drift, xws li kub hloov. Piv txwv ntawm qhov no yog fiber ntau interferometers thiab qee qhov fiber ntau lasers. Qhov tsis zoo ntawm kev siv cov fibers no yog tias lawv feem ntau xav tau kev taw qhia meej ntawm polarization, uas tuaj yeem ua rau muaj teeb meem ntau dua. Nyob rau tib lub sijhawm, kev nthuav tawm poob yog siab dua li ntawm cov qauv kho qhov muag fibers, thiab nws yog qhov nyuaj rau khaws txhua hom optical fibers hauv polarization khaws daim ntawv.
PM fibers yog siv rau hauv cov ntawv tshwj xeeb xws li cov ntawv thov fiber ntau, kev cuam tshuam, thiab quantum tseem ceeb faib. Nws kuj yog siv nyob rau hauv kev sib txuas lus ntev ntawm laser generators thiab modulators, uas yuav tsum tau polarized lub teeb raws li cov tswv yim. Nws tsis tshua muaj siv rau kev sib kis mus ntev vim PM fiber ntau kim heev thiab muaj qhov attenuation ntau dua li ib hom fiber ntau.
Cov kev xav tau rau kev siv PM fiber ntau
Terminal: Thaum lub davhlau ya nyob twg ntawm PM fiber ntau yog ib qho khoom siv kho qhov muag, nws yog ib qho tseem ceeb uas yuav tsum tau txuas cov pas nrig kev nyuaj siab rau lub connector, feem ntau yog los ntawm tus yuam sij.
Splicing: Splicing PM fibers kuj yuav tsum tau ua tib zoo ua tib zoo. Thaum cov fiber ntau yog fused, X, Y, thiab Z axes yuav tsum tau ua kom zoo thiab qhov kev sib hloov yuav tsum tau ua kom zoo kom qhov kev ntxhov siab tuaj yeem ua tiav.
Lwm qhov yuav tsum tau muaj yog tias qhov xwm txheej tshwm sim thaum kawg ntawm cov fiber ntau yuav tsum ua raws li cov kev taw qhia ntawm lub hauv paus ntsiab lus ntawm cov axis.cov fiberntu ntu.
