Yuav kom tau raws li qhov xav tau ntawm cov neeg ntxiv rau cov ntaub ntawv, qhov kev sib kis ntawm cov kab ke sib txuas lus fiber ntau dua txhua hnub. Lub network sib txuas lus optical yav tom ntej yuav tsim mus rau lub network sib txuas lus fiber ntau nrog ultra-high speed, ultra-large capacity, ultra-long distance, thiab ultra-high spectrum efficiency. Lub transmitter yog qhov tseem ceeb. Lub high-speed optical signal transmitter feem ntau yog tsim los ntawm lub laser uas tsim cov khoom siv optical, lub cuab yeej tsim hluav taws xob modulating, thiab lub high-speed electro-optical modulator uas modulates lub optical carrier. Piv nrog rau lwm hom sab nraud modulators, lithium niobate electro-optical modulators muaj qhov zoo ntawm kev ua haujlwm dav zaus, kev ruaj khov zoo, qhov sib piv siab, kev ua haujlwm ruaj khov, kev hloov pauv siab, chirp me me, kev sib txuas yooj yim, kev siv tshuab tsim khoom paub tab, thiab lwm yam. Nws yog siv dav hauv high-speed, large-capacity, thiab long-distance optical transmission systems.
Lub zog hluav taws xob ib nrab nthwv dej yog ib qho tseem ceeb heev ntawm lub electro-optic modulator. Nws sawv cev rau qhov kev hloov pauv ntawm lub zog hluav taws xob bias uas sib raug rau lub zog teeb pom kev ntawm lub electro-optic modulator los ntawm qhov tsawg kawg nkaus mus rau qhov siab tshaj plaws. Nws txiav txim siab lub electro-optic modulator rau ntau yam. Yuav ua li cas kom raug thiab sai ntsuas lub zog hluav taws xob ib nrab nthwv dej ntawm lub electro-optic modulator yog qhov tseem ceeb heev rau kev ua kom zoo dua ntawm lub cuab yeej ua haujlwm thiab txhim kho kev ua haujlwm ntawm lub cuab yeej. Lub zog hluav taws xob ib nrab nthwv dej ntawm lub electro-optic modulator suav nrog DC (ib nrab nthwv dej
voltage thiab radiofrequency) ib nrab-wave voltage. Lub luag haujlwm hloov pauv ntawm lub electro-optic modulator yog raws li nram no:
Ntawm lawv yog lub zog tso zis ntawm lub electro-optic modulator;
Puas yog lub zog optical input ntawm lub modulator;
Puas yog qhov poob ntawm qhov ntxig ntawm lub electro-optic modulator;
Cov txheej txheem uas twb muaj lawm rau kev ntsuas ib nrab-nthwv dej muaj xws li kev tsim nqi siab heev thiab cov txheej txheem ob npaug zaus, uas tuaj yeem ntsuas qhov tam sim no ncaj qha (DC) ib nrab-nthwv dej voltage thiab xov tooj cua zaus (RF) ib nrab-nthwv dej voltage ntawm lub modulator, raws li.
Rooj 1 Kev sib piv ntawm ob txoj kev sim hluav taws xob ib nrab nthwv dej
| Txoj kev muaj nqis heev | Txoj kev ua ob npaug zaus | |
| Cov khoom siv hauv chav kuaj mob | Lub zog fais fab laser Kev ntsuas qhov muaj zog nyob rau hauv kev sim Lub hwj chim DC hloov kho tau ± 15V Lub ntsuas hluav taws xob kho qhov muag | Lub teeb laser Kev ntsuas qhov muaj zog nyob rau hauv kev sim Lub hwj chim DC hloov kho tau Oscilloscope qhov chaw teeb liab (DC kev ntxub ntxaug) |
| lub sijhawm sim | 20 feeb() | 5 feeb |
| Cov txiaj ntsig ntawm kev sim | yooj yim ua tiav | Kev xeem raug zoo Tau txais DC ib nrab-yoj voltage thiab RF ib nrab-yoj voltage tib lub sijhawm |
| Cov kev tsis zoo ntawm kev sim | Lub sijhawm ntev thiab lwm yam, qhov kev xeem tsis raug Kev sim ncaj qha rau cov neeg caij tsheb DC ib nrab-wave voltage | Lub sijhawm ntev heev Tej yam xws li kev txiav txim siab yuam kev loj ntawm waveform distortion, thiab lwm yam, qhov kev xeem tsis raug |
Nws ua haujlwm raws li nram no:
(1) Txoj kev muaj nqis heev
Tus txheej txheem muaj nqis heev yog siv los ntsuas qhov DC ib nrab nthwv dej voltage ntawm lub electro-optic modulator. Ua ntej, tsis muaj lub teeb liab modulation, qhov nkhaus hloov pauv ntawm lub electro-optic modulator tau txais los ntawm kev ntsuas qhov DC bias voltage thiab qhov hloov pauv ntawm lub teeb tso zis, thiab los ntawm qhov nkhaus hloov pauv txiav txim siab qhov siab tshaj plaws thiab qhov tsawg kawg nkaus, thiab tau txais cov nqi DC voltage Vmax thiab Vmin sib xws. Thaum kawg, qhov sib txawv ntawm ob qhov nqi voltage no yog qhov ib nrab nthwv dej voltage Vπ = Vmax-Vmin ntawm lub electro-optic modulator.
(2) Txoj kev ua ob npaug zaus
Nws siv txoj kev ntsuas zaus ob npaug los ntsuas qhov hluav taws xob RF ib nrab nthwv dej ntawm lub electro-optic modulator. Ntxiv lub khoos phis tawj DC bias thiab lub teeb liab AC modulation rau lub electro-optic modulator tib lub sijhawm los kho qhov hluav taws xob DC thaum lub zog tso zis hloov mus rau qhov siab tshaj plaws lossis tsawg kawg nkaus. Tib lub sijhawm, thiab nws tuaj yeem pom ntawm dual-trace oscilloscope tias lub teeb liab tso zis modulated yuav tshwm sim zaus ob npaug distortion. Qhov sib txawv tsuas yog ntawm DC voltage sib raug rau ob qhov sib ze zaus ob npaug distortions yog RF ib nrab nthwv dej voltage ntawm lub electro-optic modulator.
Kev Nthuav Qhia: Ob qho tib si txoj kev ntsuas tus nqi siab heev thiab txoj kev ntsuas zaus ob npaug tuaj yeem ntsuas qhov hluav taws xob ib nrab ntawm lub electro-optic modulator, tab sis rau kev sib piv, txoj kev ntsuas tus nqi muaj zog yuav tsum tau siv sijhawm ntsuas ntev dua, thiab lub sijhawm ntsuas ntev dua yuav yog vim Lub zog tso zis ntawm lub laser hloov pauv thiab ua rau muaj qhov yuam kev ntsuas. Txoj kev ntsuas tus nqi siab heev yuav tsum luam theej duab DC bias nrog tus nqi kauj ruam me me thiab sau cov zog tso zis ntawm lub modulator tib lub sijhawm kom tau txais tus nqi hluav taws xob ib nrab ntawm lub DC raug dua.
Txoj kev ntsuas zaus ob npaug yog ib txoj kev los txiav txim siab qhov hluav taws xob ib nrab nthwv dej los ntawm kev soj ntsuam qhov zaus ob npaug ntawm nthwv dej. Thaum qhov hluav taws xob bias siv tau mus txog qhov tseem ceeb, qhov kev cuam tshuam zaus ntau ntxiv tshwm sim, thiab qhov kev cuam tshuam ntawm nthwv dej tsis pom tseeb heev. Nws tsis yooj yim rau kev soj ntsuam nrog lub qhov muag liab qab. Ua li no, nws yuav ua rau muaj qhov yuam kev loj dua, thiab qhov nws ntsuas yog qhov hluav taws xob ib nrab nthwv dej RF ntawm lub electro-optic modulator.