Kev Qhia Qhov Raug Mob Tawm Dispersion (DCM):Hauv kev sib txuas lus fiber ntau, dispersion kev them nyiaj tsim kho (DCM) (tseem hu ua dispersion compensation unit, DCU) tuaj yeem siv los them rau kev ncua ntev chromatic dispersion ntawm kev sib kis. Feem ntau, xws li tus qauv no muab qee tus nqi ntawm kev tawg (piv txwv li cov dispersion ib txwm muaj nyob hauv thaj tsam 1.6-μm spectral), txawm hais tias tunable dispersion modules tseem muaj.
Ib qho qauv tau muab tau yooj yim tso rau hauv cov kab ke fiber ntau vim tias nws muaj cov kab ua hluav taws xob rau kev tawm tswv yim thiab tawm. Kev ploj ntawm kev nkag mus tuaj yeem them taus nrog lub tshuab hluav taws xob fiber ntau, piv txwv li erbium-doped fiber amplifier hauv 1.5-micron xov tooj sib luag. Peb tseem pom ntau zaus hais tias ib qho kev faib hluav taws xob-them nyiaj feem ntau tso ntawm ob lub xov tooj hluav taws xob.
Txoj Kev Them Nyiaj Dispersion Module (DCM)
Lub Hom Phiaj ntawm Kev Kho Mob Raug Nyiam Kev Nyuaj Siab (DCM)
a. Kev faib tawm yog qhov ua haujlwm ntawm qhov ntev ntawm cov optical fiber thiab yog li nrog kev hwm ntawm qhov ntev nws nce.
b. Lub hom phiaj ntawm kev siv DCM yog tias qhov kev sib cais no ua rau ISI thiab qhov poob ntawm cov ntaub ntawv hauv qhov kis tau tus mob.
c. Yuav kom kov yeej qhov kev sib cais no ntau thiab kom nce qhov kev sib kis ntev peb xav tau ib qho qauv hu ua Dispersion Compensating Module (DCM).
d. DCM feem ntau muaj cov khoom kho qhov muag nrog qhov siab tsis zoo dispersion coefficient.Due rau dispersion lub teeb pulses kis thiab feem ntau sib tshooj nrog cov sij hawm sib law liag. Qhov no ua rau muaj kev cuam tshuam los ntawm cov khoom nyob sib ze thiab ua rau BER siab. Thaum siab me ntsis nqi rau tib lub plawv dhia dav, qhov BER (vim yog kis) yuav dhau los ua ntau dhau.
