Qhov tseem ceeb tshaj plaws ntawm kev kho qhov muag module yog ua kom tiav qhov kho qhov muag-hluav taws xob / hluav taws xob-kho qhov muag hloov pauv kev ua haujlwm ntawm cov teeb liab kho qhov muag, thiab nws sab hauv yog tsim los ntawm cov khoom siv kho qhov muag, cov khoom siv hluav taws xob, thiab cov khoom siv kho qhov muag. Cov khoom siv kho qhov muag yog cov khoom tseem ceeb ntawm cov khoom siv kho qhov muag, thiab cov khoom siv kho qhov muag ntxiv qee qhov kev ua haujlwm thiab cov qauv tsim raws li cov khoom siv kho qhov muag.
Cia peb pib nrog cov khoom siv kho qhov muag ntawm optical module. Ntawm cov khoom siv kho qhov muag ntawm cov khoom siv kho qhov muag, cov khoom siv kho qhov muag siv rau kev hloov kho qhov muag teeb liab hu ua TOSA thiab ROSA feem. Cia peb qhia lawv kom ntxaws.
Lub ntsiab tivthaiv ntawm TOSA (Transmitting Optical Sub-Assembley) optical transmitter module feem ntau ua tiav cov kev hloov pauv ntawm hluav taws xob teeb liab rau hauv cov teeb liab kho qhov muag. Ntawm lawv, lub teeb ci (semiconductor light-emitting diode los yog laser diode) yog cov tub ntxhais, LD nti, saib photodiode (MD) thiab lwm yam khoom siv tau ntim rau hauv cov qauv compact (TO coaxial pob lossis pob npauj npaim), thiab tom qab ntawd TOSA yog tsim.
Nyob rau hauv TOSA, LD laser diode yog tam sim no feem ntau siv semiconductor emitting ntaus ntawv rau optical modules. Nws muaj ob lub ntsiab tsis tseem ceeb: qhov pib tam sim no (Ith) thiab txoj kab nqes kev ua haujlwm (S). Txhawm rau ua kom LD ua haujlwm sai, peb yuav tsum muab LD nrog DC bias tam sim no IBIAS me ntsis ntau dua li qhov pib tam sim no (DC Bias hauv daim duab saum toj no), uas yog, lub laser tawm thaum lub sijhawm tam sim no tshaj qhov pib tam sim no. .
ROSA (Resceiving Optical Sub-Assembly) kho qhov muag tau txais los ua ke, nyob rau hauv cov ntaub ntawv siab tus nqi kho qhov muag fiber ntau module, feem ntau PIN los yog ADP photodiode thiab TIA yog sib sau ua ke nyob rau hauv ib tug kaw hlau casing los ua peb optical txais los ua ke.
Optical module ROSA yog tsim los ntawm photodetector (PIN / APD), TIA preamplifier, limiting amplifier, thiab lwm yam.
Cia peb saib ua ntej ntawm photodetector, lub ntsiab ntawm cov khoom tau txais ROSA (lub photodetector siv nyob rau hauv daim duab saum toj no yog APD), uas nws lub luag haujlwm tseem ceeb yog hloov cov teeb liab kho qhov muag rau hauv cov teeb liab hluav taws xob los ntawm cov nyhuv photoelectric. Cov photodetectors feem ntau hauv kev sib txuas lus kho qhov muag yog PIN photodiodes thiab avalanche photodiodes (APDs). Raws li peb tau hais nyob rau hauv cov ntawv dhau los, APDs yog lub siab-rhiab heev photodetector uas siv cov avalanche multiplication nyhuv los ua kom lub photocurrent Ob chav, piv nrog PIN photodiodes, APD receiver rhiab heev tuaj yeem nce los ntawm 6 ~ 10dB.
Lub teeb liab tsis muaj zog tam sim no tsim los ntawm photodetector yog hloov mus rau hauv lub teeb liab voltage ntawm txaus magnitude los ntawm lub preamplifier TIA (Trans-Impedance Amplifier), thiab ces tso zis. TIA yog qhov tseeb V converter, uas converts electro-optic tam sim no rau hauv voltage.
Lub sijhawm no, qhov hluav taws xob hluav taws xob tsim los ntawm TIA tseem yog lub teeb liab analog, uas yuav tsum tau hloov mus rau hauv cov teeb liab digital ua ntej lub teeb liab ua hluav taws xob tuaj yeem paub txog nws. Lub luag haujlwm ntawm kev txwv lub suab amplifier Poster Amplifier tom qab TIA yog los hloov cov cim ntawm qhov sib txawv ntawm cov amplitudes rau cov cim digital nrog tib lub amplitude.
Txais tos tiv tauj peb kom paub meej ntxiv:
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