WDM PON yog point-to-point passive optical network siv wavelength division multiplexing technology.Ntawd yog, nyob rau hauv tib lub fiber ntau, tus naj npawb ntawm wavelengths siv nyob rau hauv ob qho tib si cov lus qhia yog ntau tshaj 3, thiab kev siv lub wavelength division multiplexing technology kom ua tau raws li uplink access yuav muab ntau dua bandwidth ua hauj lwm ntawm tus nqi qis, uas yog ib qho tseem ceeb txoj kev loj hlob kev taw qhia rau yav tom ntej Optical fiber nkag.Ib tug raug WDM PON system muaj peb yam: Optical Line Terminal (OLT), Optical Wavelength Distribution Network (OWDN) thiab Optical Network Unit (ONU: Optical Network Unit), raws li qhia hauv daim duab 1. OLT yog cov khoom siv hauv chaw ua haujlwm, suav nrog optical wavelength division multiplexer / demultiplexer (OM / OD).Feem ntau, nws muaj cov haujlwm xws li kev tswj hwm, kev sib pauv, thiab kev tswj hwm.OM / OD ntawm lub chaw ua haujlwm hauv nruab nrab tuaj yeem raug cais tawm ntawm cov khoom siv OLT.OWDN yog hais txog lub network kho qhov muag nyob nruab nrab ntawm OLT thiab ONU, thiab paub txog qhov sib faib wavelength ntawm OLT mus rau ONU lossis los ntawm ONU mus rau OLT.Qhov txuas lub cev muaj xws li feeder fiber thiab passive tej thaj chaw deb ntawm (PRN: Passive Remote Node).PRN feem ntau suav nrog thermally insensitive arrayed waveguide grating (AAWG: Athermal Arrayed Waveguide Grating).AAWG yog ib lub wavelength-sensitive passive optical ntaus ntawv uas ua rau optical wavelength multiplexing thiab demultiplexing zog.ONU tau muab tso rau ntawm tus neeg siv lub davhlau ya nyob twg thiab yog ib qho khoom siv kho qhov muag ntawm tus neeg siv sab.
Nyob rau hauv lub downstream kev taw qhia, ntau qhov sib txawv wavelengths ld1…ldn raug xa mus rau OWDN tom qab OM / OD multiplexing ntawm lub hauv paus chaw ua haujlwm, thiab muab faib rau txhua ONU raws li qhov sib txawv wavelengths.Nyob rau hauv qhov kev taw qhia saum toj kawg nkaus, cov neeg siv sib txawv ONUs emit qhov sib txawv ntawm qhov muag wavelengths lu1…lun mus rau OWDN, multiplex ntawm PRN ntawm OWDN, thiab tom qab ntawd xa mus rau OLT.Ua kom tiav cov kab hluav taws xob sab saud thiab qis qis ntawm cov teeb liab kho qhov muag.Ntawm lawv, qhov downstream wavelength ldn thiab upstream wavelength lun tuaj yeem ua haujlwm hauv tib lub waveband lossis sib txawv wavebands.