Raws li ib feem tseem ceeb ntawm kev sib txuas lus fiber ntau optical, optical modules yog optoelectronic li uas paub txog lub zog ntawm photoelectric hloov dua siab tshiab thiab electro-optical hloov dua siab tshiab nyob rau hauv cov txheej txheem ntawm optical teeb liab kis tau tus mob.
Lub optical module ua haujlwm ntawm lub cev txheej ntawm OSI qauv thiab yog ib qho ntawm cov khoom tseem ceeb hauv kev sib txuas lus fiber ntau optical.Nws yog tsim los ntawm cov khoom siv optoelectronic (optical transmitters, optical receivers), functional circuits, thiab optical interfaces.Nws lub luag haujlwm tseem ceeb yog kom paub txog kev hloov pauv photoelectric thiab electro-optical conversion ua haujlwm hauv kev sib txuas lus fiber ntau.Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm optical module yog qhia nyob rau hauv daim duab qhia kev ua haujlwm ntawm optical module.
Kev xa tawm cov khoom siv hluav taws xob tau txais cov teeb liab hluav taws xob nrog qee tus lej code, thiab tom qab ua tiav los ntawm kev tsav tsheb sab hauv, cov teeb liab hloov kho qhov muag ntawm tus nqi sib raug yog tawm los ntawm kev tsav tsheb semiconductor laser (LD) lossis lub teeb-emitting diode (LED).Tom qab kis tau tus mob los ntawm optical fiber, qhov tau txais kev sib txuas xa cov teeb liab kho qhov muag Nws tau hloov dua siab tshiab rau hauv cov teeb liab hluav taws xob los ntawm photodetector diode, thiab hluav taws xob teeb liab ntawm tus lej code tus nqi yog tso tawm tom qab dhau los ntawm preamplifier.
Dab tsi yog qhov ntsuas kev ua haujlwm tseem ceeb ntawm optical module
Yuav ntsuas qhov Performance index ntawm optical module li cas?Peb tuaj yeem nkag siab qhov ntsuas qhov ua tau zoo ntawm cov khoom siv kho qhov muag los ntawm cov hauv qab no.
Transmitter ntawm optical module
Nruab nrab xa hluav taws xob optical
Qhov nruab nrab kis tau tus mob optical zog yog hais txog lub optical fais fab tso zis los ntawm lub teeb qhov chaw ntawm lub transmitting kawg ntawm optical module nyob rau hauv ib txwm ua hauj lwm tej yam kev mob, uas yuav to taub raws li qhov siv ntawm lub teeb.Lub zog hluav taws xob xa hluav taws xob muaj feem cuam tshuam rau qhov kev faib ua feem ntawm "1" hauv cov ntaub ntawv xa tawm.Qhov ntau "1", lub zog kho qhov muag ntau dua.Thaum lub transmitter xa cov teeb liab pseudo-random sib lawv liag, "1" thiab "0" kwv yees li ib nrab ntawm txhua.Lub sijhawm no, lub zog tau txais los ntawm kev ntsuas yog qhov nruab nrab kis tau tus mob optical zog, thiab chav tsev yog W lossis mW lossis dBm.Ntawm lawv, W los yog mW yog linear unit, thiab dBm yog logarithmic unit.Hauv kev sib txuas lus, peb feem ntau siv dBm los sawv cev lub zog kho qhov muag.
Extinction Ratio
Qhov kev ploj tuag yog hais txog qhov tsawg kawg nkaus tus nqi ntawm qhov piv ntawm qhov nruab nrab kho qhov muag lub zog ntawm lub laser thaum emitting tag nrho "1" cov lej rau qhov nruab nrab qhov muag pom lub zog tawm thaum tag nrho "0" cov lej raug tso tawm raws li kev hloov pauv tag nrho, thiab chav tsev yog dB. .Raws li pom nyob rau hauv daim duab 1-3, thaum peb hloov lub teeb liab hluav taws xob mus rau hauv lub teeb liab kho qhov muag, lub laser nyob rau hauv lub transmitting ib feem ntawm lub optical module converts nws mus rau hauv ib tug optical teeb liab raws li tus code tus nqi ntawm lub input hluav taws xob teeb liab.Qhov nruab nrab lub zog kho qhov muag thaum tag nrho "1" cov lej sawv cev rau nruab nrab lub zog ntawm lub laser emitting lub teeb, qhov nruab nrab lub zog kho qhov muag thaum tag nrho "0" cov lej sawv cev rau nruab nrab lub zog ntawm lub laser uas tsis tawm lub teeb, thiab qhov kev ploj tuag sawv cev rau lub peev xwm. kom paub qhov txawv ntawm 0 thiab 1 cov cim, yog li Extinction piv tau suav tias yog ib qho kev ntsuas ntawm kev ua haujlwm ntawm laser.Yam tsawg kawg nkaus qhov tseem ceeb rau qhov kev ploj tuag feem ntau ntawm 8.2dB txog 10dB.
Qhov nruab nrab wavelength ntawm optical teeb liab
Nyob rau hauv emission spectrum, lub wavelength sib haum mus rau qhov nruab nrab ntawm cov kab ntu txuas rau 50℅ qhov siab tshaj plaws amplitude qhov tseem ceeb.Ntau hom lasers lossis ob lub lasers ntawm tib hom yuav muaj qhov sib txawv nruab nrab wavelengths vim cov txheej txheem, ntau lawm thiab lwm yam.Txawm tias tib lub laser yuav muaj qhov sib txawv nruab nrab wavelengths nyob rau hauv cov xwm txheej sib txawv.Feem ntau, cov tuam ntxhab ntawm cov khoom siv kho qhov muag thiab cov khoom siv kho qhov muag muab cov neeg siv nrog qhov ntsuas, uas yog, qhov nruab nrab wavelength (xws li 850nm), thiab qhov ntsuas no feem ntau yog ntau yam.Tam sim no, feem ntau yog peb lub nruab nrab wavelengths ntawm feem ntau siv optical modules: 850nm band, 1310nm band thiab 1550nm band.
Vim li cas thiaj li txhais tau rau hauv peb pawg no?Qhov no muaj feem xyuam rau qhov poob ntawm qhov muag fiber ntau kis nruab nrab ntawm cov teeb liab optical.Los ntawm kev tshawb fawb thiab kev sim tsis tu ncua, nws pom tias qhov poob ntawm fiber ntau txo qis nrog qhov ntev ntawm lub wavelength.Qhov poob ntawm 850nm tsawg dua, thiab qhov poob ntawm 900 ~ 1300nm ua siab dua;thaum nyob rau ntawm 1310nm, nws yuav qis dua, thiab qhov poob ntawm 1550nm yog qhov qis tshaj, thiab qhov poob siab tshaj 1650nm nyhav nce.Yog li 850nm yog lub qhov rais luv luv wavelength, thiab 1310nm thiab 1550nm yog qhov ntev wavelength windows.
Lub receiver ntawm optical module
Overload optical zog
Kuj tseem hu ua saturated optical zog, nws hais txog qhov siab tshaj plaws ntawm qhov nruab nrab kho qhov muag lub zog uas tau txais cov khoom kawg tuaj yeem tau txais nyob rau hauv qee qhov kev ua yuam kev me ntsis (BER = 10-12) qhov xwm txheej ntawm qhov kho qhov muag module.Unit yog dBm.
Nws yuav tsum raug sau tseg tias photodetector yuav tshwm sim photocurrent saturation phenomenon nyob rau hauv lub teeb muaj zog irradiation.Thaum qhov tshwm sim no tshwm sim, tus ntes yuav tsum tau muaj qee lub sijhawm kom rov zoo.Nyob rau lub sijhawm no, qhov kev xav tau txo qis, thiab cov teeb liab tau txais yuav raug txiav txim tsis raug.ua rau code yuam kev.Txhawm rau muab nws yooj yim, yog tias lub zog hluav taws xob input tshaj qhov overload optical zog, nws yuav ua rau cov khoom puas.Thaum siv thiab ua haujlwm, sim ua kom tsis txhob muaj lub teeb pom kev zoo kom tiv thaiv kom tsis txhob muaj lub zog hluav taws xob ntau dhau.
Txais rhiab heev
Tau txais rhiab heev yog hais txog qhov nruab nrab qhov nruab nrab qhov hluav taws xob qhov hluav taws xob qhov hluav taws xob uas tau txais cov khoom kawg tuaj yeem tau txais nyob rau hauv cov xwm txheej ntawm qee qhov yuam kev me ntsis (BER = 10-12) ntawm qhov kho qhov muag module.Yog tias lub zog xa hluav taws xob xa mus rau lub zog siv lub teeb ntawm qhov kawg xa, ces qhov tau txais rhiab heev yog hais txog lub teeb siv hluav taws xob uas tuaj yeem kuaj pom los ntawm optical module.Unit yog dBm.
Feem ntau, tus nqi siab dua, qhov tsis zoo ntawm qhov tau txais rhiab heev, uas yog, qhov ntau dua qhov tsawg kawg nkaus tau txais lub zog kho qhov muag, qhov siab dua qhov yuav tsum tau txais qhov kawg ntawm cov khoom siv kho qhov muag.
Tau txais optical zog
Lub hwj chim kho qhov muag tau txais yog hais txog qhov nruab nrab ntawm lub zog kho qhov muag uas qhov kawg tau txais cov khoom tuaj yeem tau txais nyob rau hauv cov xwm txheej ntawm qee qhov yuam kev me ntsis (BER = 10-12) ntawm qhov kho qhov muag module.Unit yog dBm.Lub sab sauv txwv ntawm qhov tau txais lub hwj chim kho qhov muag yog lub overload optical hwj chim, thiab qhov kev txwv qis yog qhov siab tshaj plaws ntawm qhov tau txais rhiab heev.
Feem ntau hais lus, thaum lub hwj chim kho qhov muag tau txais qis dua qhov tau txais rhiab heev, lub teeb liab yuav tsis tau txais ib txwm vim tias lub zog kho qhov muag tsis muaj zog heev.Thaum lub hwj chim kho qhov muag tau txais ntau dua lub hwj chim optical overload, cov teeb liab yuav tsis tau txais ib txwm vim yog qhov yuam kev me ntsis.
Comprehensive Performance index
interface ceev
Qhov siab tshaj plaws hluav taws xob teeb liab tus nqi ntawm kev ua yuam kev tsis pub kis uas cov khoom siv kho qhov muag tuaj yeem nqa tau, tus qauv Ethernet tau teev tseg: 125Mbit / s, 1.25Gbit / s, 10.3125Gbit / s, 41.25Gbit / s.
Kev sib kis nrug
Qhov kev ncua deb ntawm optical modules yog tsuas yog txwv los ntawm kev poob thiab dispersion.Poob yog qhov poob ntawm lub teeb lub zog vim qhov nqus, tawg thiab tawg ntawm qhov nruab nrab thaum lub teeb xa mus rau hauv cov fiber ntau optical.Ib feem ntawm lub zog no yog dissipated ntawm ib tug npaum li cas raws li qhov kev ncua deb ntawm kis tau tus mob.Dispersion feem ntau yog vim lub fact tias electromagnetic nthwv dej ntawm txawv wavelengths propagate ntawm txawv speeds nyob rau hauv tib qhov nruab nrab, uas ua rau cov wavelength sib txawv ntawm cov teeb liab optical tuaj txog ntawm qhov kawg tau txais ntawm lub sij hawm sib txawv vim qhov sib txuam ntawm kev sib kis, ua rau cov mem tes. broadening, uas ua rau nws tsis yooj yim sua kom paub qhov txawv ntawm qhov muaj nqis.
Nyob rau hauv cov nqe lus ntawm qhov txwv dispersion ntawm qhov kho qhov muag module, qhov kev ncua deb yog ntau dua li qhov kev ncua deb ntawm qhov poob, yog li nws tuaj yeem tsis quav ntsej.Qhov kev txwv poob tuaj yeem kwv yees raws li cov qauv: poob qis qhov deb = (hloov lub zog kho qhov muag - tau txais rhiab heev) / fiber ntau attenuation.Lub attenuation ntawm optical fiber ntau muaj feem xyuam rau qhov tseeb xaiv optical fiber.
Post lub sij hawm: Apr-27-2023