Ib qho kev soj ntsuam ntawm ib qho tseem ceeb txwv nyob rau hauv Optical Communication Testing
Hauv kev teeb tsa thiab kev saib xyuas ntawm fiber ntau -optic networks, PON lub zog ntsuas hluav taws xob feem ntau yog siv los ntsuas cov hluav taws xob qis qis hauv cov khoom siv kho qhov muag (PONs). Txawm li cas los xij, ntau tus engineers tau sim siv lawv los ntsuas cov teeb liab kho qhov muag ntawm lub wavelengths xws li 1510 nm, 1530 nm, lossis 1570 nm, tsuas yog kom tau ntsib nrog cov txiaj ntsig tsis meej pem - nyeem qis heev lossis siv tsis tau. Qhov tseeb, qhov no tsis yog vim cov cuab yeej ua haujlwm tsis zoo tab sis yog txiav txim siab los ntawm cov qauv tsim qauv ntawm PON fais fab ntsuas.
I. Wavelength Planning nyob rau hauv PON Networks thiab Yuav Ua Li Cas Fais Fab Meters Ua Haujlwm
Ib qho PON system siv Wavelength Division Multiplexing (WDM) thev naus laus zis los xa cov kab hluav taws xob sab saud thiab qis qis ntawm qhov sib txawv wavelengths:
Kev taw qhia hauv qab (OLT → ONU):
1490nm: Nqa cov ntaub ntawv tseem ceeb (piv txwv li, GPON / EPON)
1550nm: Siv rau cov kev pabcuam tshaj tawm video (CATV)
Upstream kev taw qhia (ONU → OLT):
1310nm: Siv rau GPON / EPON
1510 nm: Siv nyob rau hauv 10G PON systems xws li XG-PON/XGS-PON
Lub luag haujlwm tseem ceeb ntawm PON lub ntsuas hluav taws xob yog ntsuas qhov ntsuas hluav taws xob qis qis ntawm tus neeg siv kawg. Nyob rau ntawm lub sijhawm no, cov teeb liab kho qhov muag muaj ob lub teeb qis qis (1490/1550 nm) thiab lub teeb tsis muaj zog (1310/1510 nm). Yog tias qhov dav dav - lub hom phiaj kho qhov muag lub hwj chim ntsuas tau raug siv, nws yuav suav nrog lub zog kho qhov muag ntawm txhua qhov wavelengths, ua rau muaj qhov tsis raug tseem ceeb.
Yog li ntawd, PON fais fab ntsuas ntsuas tau nruab nrog qhov ntsuas qhov ntsuas qhov tseeb. Thaum ua haujlwm hauv "PON" lossis "XGPON" hom:
Tsuas yog tso cai rau lub teeb nyob rau hauv qhov nqaim heev ntawm ib ncig ntawm 1490 nm thiab 1550 nm kom dhau;
Muaj zog suppresses lwm lub wavelengths, xws li 1310 nm, 1510 nm, thiab 1530 nm, 1570 nm, thiab lwm yam.
Qhov kev tsim no ua kom ntseeg tau tias qhov ntsuas tsuas yog teb rau cov qauv PON downstream signals, tshem tawm lwm yam cuam tshuam.
II. Vim li cas ho tsis ntsuas 1510 nm, 1530 nm, thiab 1570 nm?
Cov wavelengths no tuaj yeem faib ua ob hom, ob qho tib si uas poob rau hauv "qhov muag tsis pom" ntawm PON lub ntsuas hluav taws xob:
1510nm (Ntawv qhia zaub mov)
Cov lim hauv PON lub ntsuas hluav taws xob yog txhob txwm tsim los thaiv tag nrho cov kab hluav taws xob sab saud kom tsis txhob cuam tshuam nrog kev ntsuas hluav taws xob qis qis. Yog li ntawd, 1510 nm optical teeb liab yog hnyav heev thiab tsis tuaj yeem kuaj pom, ua rau kev nyeem ntawv tsis raug.
1530nm thiab 1570nm (Tsis yog -Standard PON Downstream Wavelengths)
Txawm hais tias cov wavelengths no feem ntau siv hauv DWDM systems lossis lwm yam kev sib txuas lus kho qhov muag, lawv tsis yog ib feem ntawm PON raws tu qauv. Lub passband ntawm PON lub hwj chim ntsuas lub lim yog qhov nqaim heev thiab ntsuas tsuas yog rau 1490 nm thiab 1550 nm. Wavelengths zoo li 1530 nm thiab 1570 nm poob sab nraum qhov no thiab zoo sib xws los ntawm cov lim.
Hauv cov ntsiab lus yooj yim, lub ntsuas hluav taws xob PON yog qhov ntsuas "yav dhau los- tshwj xeeb" uas tsuas paub txog nws qhov preset PON wavelength bands. Tag nrho lwm cov wavelengths raug kho raws li "suab nrov" thiab tsis lees paub.
III. Yuav ntsuas cov wavelength no li cas?
Cov cuab yeej ntsuas tsim nyog yuav tsum raug xaiv raws li hom teeb liab tiag tiag:
| Ntsuas Scenario | Cov cuab yeej pom zoo | PON Fais Fab Meter Performance |
|---|---|---|
| PON Downstream Teeb (1490/1550 nm) | PON Fais Fab Meter | ✅ Muaj tseeb thiab ntseeg tau |
| 10G PON Downstream (piv txwv li, 1577 nm) | Fais fab Meter Txhawb XGPON hom | ✅ Muaj tseeb thiab ntseeg tau |
| 1510nm Nruam Lub Teeb | General -Lub Hom Phiaj Fais Fab Meter | ❌ Kev nyeem ntawv tsawg heev (Filtered) |
| 1530nm / 1570nm Nruam Lub Teeb | General -Lub Hom Phiaj Fais Fab Meter | ❌ Tsis raug (Tawm ntawm Passband) |
| ONU Burst Upstream Light Signal | Burst Hom Fais Fab Meter | ❌ Ntsuas tsis tau |
General -Lub Hom Phiaj Optical Power Meter: Tso cai rau kev teeb tsa ntawm lub hom phiaj wavelength (piv txwv li, 1510 nm, 1570 nm) kom ua tiav qhov ntsuas qhov tseeb raws li qhov ntsuas ntsuas.
Burst Hom Optical Power Meter: Tshwj xeeb tsim los ntes millisecond -theem optical pulses emission los ntawm ONUs, ua rau nws tsim nyog rau kev soj ntsuam cov teeb liab.
Xaus
PON lub zog ntsuas hluav taws xob yog cov cuab yeej ua kom zoo tshaj plaws tsim los rau cov xwm txheej tshwj xeeb. Nws cov lim dej kho qhov muag ua kom muaj kev nkag siab tsuas yog rau PON downstream wavelengths. Thaum siv los ntsuas qhov tsis yog - tus qauv wavelengths xws li 1510 nm, 1530 nm, lossis 1570 nm, cov ntaub ntawv tau txais tsis raug thiab tsis siv tau.
Thaum ua qhov kev ntsuam xyuas fiber ntau -optic, nws yog ib qho tseem ceeb uas yuav tau xaiv cov cuab yeej tsim nyog raws li hom teeb liab ntsuas los xyuas kom meej qhov tseeb thiab kev ntseeg siab ntawm cov txiaj ntsig.
