Thaum kawg ntawm kev xa khoom, ib yam li cov khoom thauj yuav tsum tau muab tso rau hauv lub thawv kom yooj yim rau kev thauj khoom,40G/100Gteeb liab ntawm tus neeg siv khoom kuj yuav tsum tau teeb tsa hauv OTU3 / OTU4 teeb liab "container". OTU3 / OTU4 yog lub teeb liab ntim ntawm qhov sib txawv. OTU3 tuaj yeem tuav 40 G teeb liab, thiab OTU4 tuaj yeem tuav 100 G cov cim. Lub teeb laser emitted los ntawm lub laser yog muab faib ua ob txoj kev ntsug ntawm X thiab Y los ntawm lub polarization beam splitter.
Rau 100G coherent optical transmission systems, OTU4 teeb liab tau hloov mus rau hauv 4 lub teeb liab, thiab cov teeb liab laser nyob rau hauv ob qho kev taw qhia polarization yog feem hloov los ntawm PM-QPSK. Lub teeb modulated polarized yog ua ke rau hauv ib lub teeb laser los ntawm polarization combiner thiab xa mus rau cov kab hluav taws xob optical thiab xa mus rau cov chaw taws teeb. Ib yam li ntawd, rau 40G coherent optical transmission system, OTU3 teeb liab tau hloov mus rau hauv ob lub teeb liab, thiab cov teeb liab laser hauv ob txoj kev taw qhia polarization yog feem ntau hloov kho los ntawm PM-BPSK. PM-QPSK (Polarization-multiplexed Quadrature Phase Shift Keying) thiab PM-BPSK (Polarization Multiplexed Binary Phase Shift Keying) ob qho tib si hloov cov ntaub ntawv teeb liab mus rau hauv txoj kev tsim nyog rau kab kis ntawm cov teeb liab. Kuv yuav tsis tham txog qhov tob ntawm no. Cov neeg nyeem uas txaus siab rau kev nkag siab tuaj yeem xa mus rau cov phau ntawv qhia txog kev siv tshuab digital modulation.
Thaum qhov kawg tau txais, lub teeb liab tau txais tau muab faib ua X thiab Y polarization cov lus qhia los ntawm cov kab hluav taws xob polarization splitter. Lub zos oscillator laser kuj cais lub teeb polarized nyob rau hauv X thiab Y cov lus qhia kom coherent nrog lub teeb liab tau txais. Lub teeb liab coherent nkag mus rau DSP (Digital Signal Processing, digital signal processing) module tom qab photoelectric hloov dua siab tshiab thiab analog rau digital ua los ntawm ADC (Analog to Digital Converter) module. Lub DSP module digitally compensates teeb liab distortions xws li chromatic dispersion thiab polarization hom dispersion ntawm txoj kev kho qhov muag, thiab rov kho cov teeb liab qub tom qab.
Adopting lub coherent txais technology, lub40G/100G coherent optical kis tau tus mob tsis tas yuav nruab nrog ib tug ruaj dispersion them nyiaj module (DCM) thiab ib tug tunable dispersion them nyiaj module (TDCM), uas txo cov configuration ntawm fiber ntau amplifiers nyob rau hauv lub system thiab tsis xav tau fiber ntau txuas ntev thiab dispersion qhov tseeb. Kev ntsuas tsis tau tsuas yog txo cov nqi kev teeb tsa thiab cov peev txheej ntawm cov neeg ua haujlwm, tab sis kuj tseem txhim kho kev ua haujlwm ntawm optical fiber kis network.
40G / 100G coherent signals tuaj yeem sib xyaw thiab xa nrog cov cim 10G / 40G wavelength, paub txog kev txhim kho du ntawm cov kev sib txuas ib txwm nruab nrog DCM rau40G/100Gcoherent networks.
