A WDMLub teeb liab muaj cov kab ntawm ntau lub wavelengths, thiab cov channel no yog multiplexed thiab xa mus rau hauv ib qho fiber ntau optical, thiab txhua lub wavelength channel yog ib qho kev pabcuam ywj pheej.
Piv txwv tias tsuas yog ib lub wavelength ntawm optical teeb liab kis tau nyob rau hauv ib tug optical fiber, tus nqi yog kim piv rau tus nqi ntawm cov optical fiber. Yog tias cov teeb liab kho qhov muag ntawm ntau lub wavelengths raug xa mus rau hauv ib qho fiber ntau optical, thiab cov teeb liab kho qhov muag tsis cuam tshuam rau ib leeg, qhov no yuav tsis tsuas yog txuag nqi tab sis kuj nce kev sib kis bandwidth. Tam sim no, WDM thev naus laus zis xa cov teeb liab kho qhov muag ntawm ntau lub wavelengths hauv ib qho fiber ntau optical. Lub teeb liab kho qhov muag ntawm txhua lub wavelength sawv cev rau ib channel, thiab ntau txoj kev xa cov ntaub ntawv ib txhij hauv ib qho fiber ntau, uas yog multiplexing ntawm ib qho fiber ntau.
OADMpaub txog cov haujlwm ntawm ib txwm siv hluav taws xob SDH ntxiv-poob multiplexing hauv lub sijhawm sau npe hauv qhov chaw kho qhov muag, thiab nws yog pob tshab thiab tuaj yeem lis cov cim ntawm txhua hom ntawv thiab tus nqi, uas zoo dua li cov hluav taws xob ADM (ntxiv-poob multiplexing) siv hauv SDH tes hauj lwm. ntaus ntawv) yog superior.
Kev txhais ntawm sub-insertion ntawm no txhais tau tias saum thiab hauv qab.
Ntxiv cov channel txhais tau hais tias ntxiv cov channel ntawm lub wavelength tshiab rau cov teeb liab kho qhov muag nkag mus rau optical add-poob multiplexer, thiab multiplexing nws mus rau hauv cov fiber ntau optical ua ke nrog lwm cov channel.
Qhov poob txhais tau hais tias nyob rau hauv cov teeb liab kho qhov muag nkag mus rau qhov kho qhov muag ntxiv-poob multiplexer, cov channel ntawm ib lub wavelength raug tshem tawm, thiab lwm cov channel tsis cuam tshuam ncaj qha dhau los ntawm optical add-poob multiplexer. Nco tseg: Lub downlink channel yog xa ncaj qha mus rau lub cuab yeej rau kev ua lag luam, uas tsis txhais hais tias truncation.
Lub luag haujlwm tseem ceeb ntawm OADM yog tso tseg lossis ntxig ib lossis ntau lub wavelengths los ntawm ntau lub wavelength channels, thiab muaj ob hom: hom ruaj khov thiab hom reconfigurable.
Cov hom ruaj khov tsuas tuaj yeem ntxiv thiab tso ib lossis ntau dua qhov ruaj khov wavelengths, thiab cov routing ntawm nodes tau txiav txim siab; nws tsis muaj qhov hloov tau yooj yim, tab sis muaj kev txhim khu kev qha thiab qeeb qeeb.
Hom reconfigurable tau dynamically kho lub wavelength ntawm sab sauv thiab qis raws ntawm OADM node, thiab muaj peev xwm paub lub dynamic reconfiguration ntawm lub kho qhov muag network, thiaj li hais tias lub wavelength cov kev pab cuam ntawm lub network yuav muab tau zoo faib. Lub OADM ntawm tag nrho fiber optic qauv kuj tuaj yeem tsim nrog cov tshuab fiber ntau optic.
Tab sis tsis muaj teeb meem dab tsi ntawm cov qauv OADM tau txais, cov kev cai yooj yim yog tib yam (kev tso qhov poob yuav tsum me me, kev sib cais ntawm cov channel yuav tsum siab, tsis hnov tsw rau ambient kub hloov thiab polarization, thiab muaj peev xwm zam tau wavelength drift thiab teeb liab qhov chaw nyob rau hauv ib tug tej yam kev mob. . jitter). OADM yuav tsum muaj peev xwm ua kom ntseeg tau tias lub zog ntawm cov kev sib kis tau zoo ib yam thaum lub sijhawm ntxiv thiab xa xov tooj. Kev ua haujlwm ntawm OADM yuav tsum siv zog ua kom yooj yim thiab yooj yim, thiab tuaj yeem ua tiav qhov kev ua tau zoo-tus nqi sib piv.
Optical add-drop multiplexer yog ib qho khoom siv sib txuas lus hauv lub network, thiab cov khoom siv sib txuas lus kuj sawv cev rau lub network node. Qee qhov kev pabcuam kis tau los ntawm lub network xav tau "tso tawm" ntawm lub network node thiab nkag mus rau lub network node rau kev ua haujlwm tom ntej, thiab qee qhov ncaj qha dhau los ntawm lub network node, thiab tseem muaj cov kev pabcuam hauv lub network node uas tseem xav tau " mus rau lub tsheb" xa mus rau lub network ntawm no mus. Yog li ntawd, lub luag hauj lwm ntawm optical add-poob multiplexer yog cais cov channel uas yuav tsum tau muab tshem tawm, ntxiv cov channel uas yuav tsum tau ntxiv, thiab hla cov channel tsis cuam tshuam ncaj qha.
