Txhawm rau kom tau raws li cov neeg xav tau cov ntaub ntawv ntau ntxiv, qhov kev sib kis ntawm cov kab hluav taws xob sib txuas lus tau nce zuj zus ib hnub. Kev sib txuas lus kho qhov muag yav tom ntej yuav txhim kho mus rau kev sib txuas lus fiber ntau optical nrog ultra-siab ceev, ultra-loj peev xwm, ultra-ntev deb, 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 kho qhov muag, cov khoom siv hluav taws xob hloov hluav taws xob tsim hluav taws xob, thiab lub tshuab hluav taws xob hluav taws xob hluav taws xob siab ceev uas hloov kho qhov muag kho qhov muag. Piv nrog rau lwm hom sab nraud modulators, lithium niobate electro-optical modulators muaj qhov zoo ntawm kev khiav hauj lwm zaus, zoo stability, siab extinction ratio, ruaj khov ua hauj lwm, siab modulation tus nqi, me chirp, yooj yim coupling, mature ntau lawm technology, thiab lwm yam. yog dav siv nyob rau hauv high-ceev, loj-muaj peev xwm, thiab ntev-ntev optical kis systems.
Qhov ib nrab-yoj voltage yog qhov tseem ceeb ntawm lub cev tsis zoo ntawm electro-optic modulator. Nws sawv cev rau qhov kev hloov pauv ntawm qhov tsis sib xws ntawm qhov sib thooj rau qhov tso zis lub teeb siv ntawm electro-optic modulator los ntawm qhov tsawg kawg nkaus mus rau qhov siab tshaj plaws. Nws txiav txim siab lub electro-optic modulator mus rau qhov loj. Yuav ua li cas kom raug thiab nrawm ntsuas qhov ib nrab-yoj voltage ntawm electro-optic modulator yog qhov tseem ceeb rau kev ua kom lub cuab yeej ua tau zoo thiab txhim kho kev ua haujlwm ntawm lub cuab yeej. Ib nrab-yoj voltage ntawm electro-optic modulator suav nrog DC (ib nrab-yoj
voltage thiab radiofrequency) ib nrab-yoj voltage. Kev hloov pauv ntawm electro-optic modulator yog raws li hauv qab no:
Ntawm lawv yog cov zis hluav taws xob kho qhov muag ntawm electro-optic modulator;
Yog lub input optical zog ntawm lub modulator;
Puas yog qhov poob ntawm cov electro-optic modulator;
Cov txheej txheem uas twb muaj lawm rau kev ntsuas ib nrab-yoj voltage muaj xws li cov nqi tsim nyog thiab ntau zaus ob txoj hauv kev, uas tuaj yeem ntsuas qhov ncaj qha tam sim no (DC) ib nrab-yoj voltage thiab xov tooj cua zaus (RF) ib nrab-yoj voltage ntawm lub modulator, feem.
Table 1 Kev sib piv ntawm ob txoj kev ntsuas hluav taws xob ib nrab
| Txoj kev muaj nuj nqis heev | Txoj kev ua ob npaug | |
| Cov cuab yeej kuaj | Laser fais fab mov Kev siv zog modulator nyob rau hauv kev sim Adjustable DC fais fab mov ± 15V Optical zog ntsuas | Laser qhov chaw Kev siv zog modulator nyob rau hauv kev sim Adjustable DC fais fab mov Oscilloscope teeb liab qhov chaw (DC Bias) |
| lub sijhawm kuaj | 20 feeb () | 5 feeb |
| Kev sim zoo | yooj yim ua kom tiav | Kev ntsuam xyuas txheeb ze Tau txais DC ib nrab-yoj voltage thiab RF ib nrab-yoj voltage tib lub sijhawm |
| Kev sim tsis zoo | Lub sijhawm ntev thiab lwm yam, qhov kev xeem tsis raug Direct neeg nrog caij kuaj DC ib nrab-yoj voltage | Lub sij hawm ntev Cov yam ntxwv xws li qhov loj waveform distortion kev txiav txim yuam kev, thiab lwm yam, qhov kev ntsuam xyuas tsis raug |
Nws ua haujlwm raws li hauv qab no:
(1) Txoj kev muaj nqis heev
Txoj kev muaj nqis heev yog siv los ntsuas qhov DC ib nrab-yoj voltage ntawm electro-optic modulator. Ua ntej, tsis muaj lub teeb liab modulation, kev hloov pauv kev ua haujlwm nkhaus ntawm electro-optic modulator tau txais los ntawm kev ntsuas qhov DC bias voltage thiab cov zis siv lub teeb hloov pauv, thiab los ntawm kev hloov pauv txoj haujlwm nkhaus txiav txim siab tus nqi siab tshaj plaws thiab tus nqi qis kawg nkaus, thiab Tau txais qhov sib thooj DC voltage qhov tseem ceeb Vmax thiab Vmin feem. Thaum kawg, qhov sib txawv ntawm ob qhov ntsuas hluav taws xob no yog qhov ib nrab-yoj voltage Vπ = Vmax-Vmin ntawm electro-optic modulator.
(2) Txoj kev ua ob npaug
Nws tau siv txoj kev ua ob npaug los ntsuas RF ib nrab-yoj voltage ntawm electro-optic modulator. Ntxiv lub DC bias computer thiab AC modulation teeb liab rau lub electro-optic modulator tib lub sij hawm los kho cov DC voltage thaum lub teeb tso zis siv tau hloov mus rau qhov siab tshaj plaws los yog yam tsawg kawg nkaus tus nqi. Nyob rau tib lub sijhawm, thiab nws tuaj yeem raug soj ntsuam ntawm ob-kab oscilloscope uas cov khoom siv hluav taws xob hloov pauv yuav tshwm sim ntau zaus ob npaug distortion. Qhov sib txawv ntawm DC voltage sib xws rau ob qhov sib txuas sib txuas ua ke ob qhov sib txawv yog qhov RF ib nrab-yoj hluav taws xob ntawm electro-optic modulator.
Cov ntsiab lus: Ob qho tib si tus nqi tsim nyog thiab qhov zaus ob npaug ntawm txoj kev tuaj yeem ntsuas qhov ntsuas ib nrab-yoj qhov hluav taws xob ntawm electro-optic modulator, tab sis rau kev sib piv, tus nqi muaj zog yuav tsum tau ntsuas lub sij hawm ntev, thiab lub sij hawm ntsuas ntev dua yuav yog vim Cov zis hluav taws xob kho qhov muag ntawm lub laser fluctuates thiab ua rau ntsuas qhov yuam kev. Txoj kev muaj nuj nqis heev yuav tsum tau luam theej duab DC kev tsis ncaj ncees nrog tus nqi me me thiab sau cov zis hluav taws xob kho qhov muag ntawm lub modulator tib lub sijhawm kom tau txais qhov tseeb dua DC ib nrab-yoj voltage tus nqi.
Txoj kev ua ob zaug zaus yog ib txoj hauv kev los txiav txim qhov ib nrab-yoj voltage los ntawm kev soj ntsuam qhov zaus ob npaug ntawm waveform. Thaum qhov kev siv tsis ncaj ncees voltage nce mus txog ib qho nqi, qhov kev sib faib ntau zaus tshwm sim, thiab lub waveform distortion tsis pom dhau lawm. Nws tsis yooj yim rau kev soj ntsuam nrog qhov muag liab qab. Nyob rau hauv txoj kev no, nws yuav inevitably ua rau ntau qhov yuam kev, thiab qhov nws ntsuas yog RF ib nrab-yoj voltage ntawm electro-optic modulator.