Dab tsi yog WDM
WDM (Wavelength Division Multiplexing) yog ib qho ntawm lub tshuab sib txuas lus kho qhov muag rau kev xa cov xov tooj loj uas muaj peev xwm hu ua wavelength division multiplexing. Daim duab 1 qhia pom cov duab kos ntawm WDM kev sib kis. Ntawm qhov kis tau ntawm WDM, ntau lub tshuab hluav taws xob ntau (cov hluav taws xob ntau) uas tso tawm lub teeb sib txawv ntawm cov yoj hluav taws xob sib txawv tau npaj, thiab txhua tus LD hloov kho los tsim teeb liab. Cov teeb liab teeb liab no tau xa mus rau ib qho kho qhov muag fiber ntau los ntawm kev siv ntau lub xov tooj (kuj hu ua Mux). Ntawm qhov tau txais sab, lub yoj yoj yob demultiplexer (tseem hu ua DeMultiplexer: DeMux) yog siv los faib lub teeb rau txhua qhov yoj, thiab photodetector (PD) tau txais lub teeb liab. Piv rau xa cov teeb liab nrog ib yoj yoj, kev xa nrog ob lub yoj yoj ob zaug ob zaug, thiab nrog peb lub yoj yoj, nws muaj peev xwm xa cov cim ntau los ntawm kev siv ntau lub yoj yoj.
Daim duab 1. Daim duab ntawm WDM sib kis
CWDM (Coarse WDM) yog WDM nrog qhov dav yoj yoj.
Hauv WDM kev sib kis, ntau cov cim qhia tuaj yeem xa mus raws li tau siv ntau lub wavelengths, tab sis txhawm rau siv ntau lub wavelengths, nws yog qhov tsim nyog los faib ib co wavelength band rau nqaim sib nrug. Yog hais tias lub yoj yoj yoj yov nqaim, tus nqi yuav nce vim tias nws yog qhov yuav tsum ua rau LD wavelength thiab cov seem xws li cov ntxaij lim dej uas cais txhua lub yoj yoj tsis raug. Ntawm qhov tod tes, yog tias qhov yoj yoj yoj mus ntev, tus nqi ntawm cov cim uas tuaj yeem xa tuaj yuav yog qhov me me, tab sis lub kaw lus yuav pheej yig. Yog li ITU-T (Telecommunication Standardization Division of International Telecommunication Union) tau txhais ob qho kev sib txawv ntawm WDM wavelength kom qhov system uas haum rau txhua daim ntawv thov tuaj yeem siv. Ib qho yog tus qauv nrog qhov nqaim wavelength luv hu ua DWDM, uas tsim nyog rau lub peev xwm loj ntev kis tau ntev. Lwm qhov yog tus qauv nrog qhov dav yoj luv hu ua CWDM, uas tsim nyog rau kis ntawm 50 rau 80 km qhov chaw muaj peev xwm tsis loj.
Daim duab 2 qhia CWDM wavelength. Qhov chaw nrab yoj yoj yog 18 nthoo sib faib los ntawm 1271 nm rau 1611 nm suav nrog O band, E band, S band, C band, thiab L band ntawm 20 nm Team sib Cov. Qhov tseeb, muaj ob peb kis qhov twg tag nrho 18 wavelengths siv, thiab 8 wavelengths ntawm 1471 nm rau 1611 nm lossis 4 wavelengths tawm ntawm {{10 }} nm rau 1611 nm feem ntau siv. Qhov no yog vim hais tias ntau qhov ntau pawg tsim tawm kho qhov muag cov khoom siv tuaj yeem siv rau hauv cov xov hluav taws xob no. Piv txwv li, CWDM lim siv rau kev faib ua ntu ntev / sib faib, sib faib Mux / DeMux pawg, thiab kho qhov ntxiv ntxiv / tso tawm qauv (OADM) uas rho tawm thiab ntxiv cov kev siv wavelengths siv tau.
Xyoo tsis ntev los no, 100 GbE-LR 4 qhov kev sib txuas lus high-speed network kho qhov muag sib txuas lus siv cov plaub nthwv xov hauv 1300 nm band (O band) tau tsim, thiab CWDM hauv pab pawg no wavelength , uas txawv ntawm CWDM nyob rau hauv pawg hu ua wavelength uas yog qhov tseem ceeb Cov Kev Pabcuam yog txais kev nyiam.
Daim duab 2. CWDM wavelength
DWDM (DDD WDM) yog WDM nrog lub voos ntev nqaim.
Daim duab. 3 qhia DWDM wavelength. Txheeb DWDM, qhov sib nrug yog txiav txim siab los ntawm qhov tuab ntawm lub teeb, tsis yog lub wavelength. Txij li DWDM tau tshaj tawm ntawm qhov kev sib kis ntev ntev uas yog siv lub tshuab ntsuas hluav taws xob, tsuas yog C band thiab L band uas yooj yim kom nrov dua tau siv, thiab txoj kab hluav taws xob sib xyaw tau ua kom zoo dua ntxiv kom muaj peev xwm kis tau. Ntxiv nrog rau 100 GHz spacing, tseem muaj 200 GHz spacing standard. Yog xav paub ntxiv, saib: ITU Grid DWDM Reference Table. Koj tuaj yeem siv cov khoom tsim kho qhov muag loj xws li DWDM cov ntxaij lim dej, Mux / DeMux units, AWG modules, thiab cov khoos phis ntxiv / tso tawm (OADMs) rau kev faib ua ntu.
Daim duab 3. DWDM zaus (nthwv dej)
Network qhov twg WDM siv
Daim duab 4 qhia cov duab ntawm lub khoos phis sib txuas lus kho qhov muag. Lub network tau muab faib ua cov network sib txuas uas txuas rau cov nroog loj, metro network txuas rau thaj chaw tseem ceeb hauv lub xeev, thiab muaj kev nkag sib txuas uas txuas cov tsev thiab cov lag luam. DWDM yog siv rau cov tub ntxhais sib txuas. Nws siv ntau qhov ntau ntawm wavelengths rau lub peev xwm loj, thiab nws siv lub tshuab hluav taws xob ntxiv rau kis tau ntev. CWDM siv feem ntau hauv metro network. CWDM yog raws li nyob rau hauv qhov ua kom pom tias tsis muaj qhov siv lub tshuab tawm suab, thiab qhov kev sib txuas lus yog li 50 km rau 80 km. Yuav luag txhua qhov chaw hauv cheeb tsam tuaj yeem npog tau yam tsis muaj qhov siv hluav taws xob ntxiv, tab sis yog tias qhov fiber ntau qhov poob loj dua qhov xav tau lossis koj xav txuas ntxiv qhov kev ncua deb me ntsis, koj tuaj yeem siv CWDM amplifier tsim los ntawm peb.
Daim duab 4. Duab ntawm kev sib txuas lus kho qhov muag network
