Optical Isolators Ua Haujlwm li cas

Optical isolators mas siv Faraday nyhuv ntawm magneto-optical crystals. Cov nyhuv Faraday yog Faraday thawj qhov kev soj ntsuam hauv xyoo 1845 tias cov khoom siv tsis yog kho qhov muag tig lub polarization kev taw qhia ntawm lub teeb hla ntawm cov khoom nyob rau hauv qhov kev txiav txim ntawm lub magnetic teb, kuj hu ua magneto-optical rotation nyhuv. Rau lub teeb polarized kis raws cov kev taw qhia ntawm lub magnetic teb, nws cov polarization kev taw qhia tig lub kaum sab xis θ yog proportional rau cov khoom ntawm magnetic teb zog B thiab qhov ntev L ntawm cov khoom. Lub hauv paus ntsiab lus ua haujlwm ntawm optical isolator yog qhia hauv daim duab 1.
Rau pem hauv ntej teeb liab teeb liab teeb liab, nws dhau los ua linearly polarized teeb tom qab dhau los ntawm polarizer. Faraday gyromagnetic nruab nrab thiab sab nraud magnetic teb ua ke tig lub polarization kev taw qhia ntawm lub teeb liab los ntawm 45 degrees mus rau sab xis, thiab tsuas yog ua rau qhov poob qis dhau los ntawm polarizer ntawm 45 degrees. Analyzer muab tso rau ntawm qhov degree. Rau lub teeb rov qab, thaum lub teeb pom kev zoo ntawm lub teeb tawm ntawm lub ntsuas hluav taws xob dhau los ntawm qhov chaw nruab nrab, cov kev taw qhia deflection kuj tig mus rau sab xis los ntawm 45 degrees, kom lub polarization kev taw qhia ntawm lub teeb rov qab yog perpendicular mus rau cov kev taw qhia ntawm lub polarizer. , tag nrho thaiv qhov kis tau tus mob ntawm reflected lub teeb.
Faraday magnetic media feem ntau siv yttrium hlau garnet (YIG) ib leeg siv lead ua uas tsis tshua muaj qhov muag tsis pom nyob rau hauv lub wavelength ntawm 1 μm mus rau 2 μm. Lub optical cais tawm ntawm pigtail tshiab cov tswv yim thiab cov zis muaj kev ua tau zoo heev, qhov qis tshaj qhov poob qis yog li 0.5dB, qhov kev sib cais yog 35-60dB, thiab qhov siab tshaj plaws tuaj yeem ncav cuag 70dB.