Dab tsi yoglaser modulationtshuab
Lub teeb yog ib hom electromagnetic yoj uas muaj ntau zaus. Nws muaj kev sib raug zoo heev thiab yog li, zoo li yav dhau los electromagnetic nthwv dej (xws li xov tooj cua thiab TV), tuaj yeem siv los ua tus xa khoom xa xov. Cov ntaub ntawv "nqa" los ntawm lub laser (nrog rau cov lus, ntawv nyeem, duab, cim, thiab lwm yam) raug xa mus rau lub receiver los ntawm tej yam kis tau tus mob raws (atmosphere, kho qhov muag fibers, thiab lwm yam), thiab tom qab ntawd txheeb xyuas thiab rov qab mus rau cov ntaub ntawv qub los ntawm optical receiver. Cov txheej txheem ntawm kev thauj cov ntaub ntawv mus rau lub laser yog hu ua modulation, thiab cov cuab yeej ua tiav cov txheej txheem no hu ua modulator. Ntawm lawv, lub laser hu ua cov cab kuj yoj; Cov ntaub ntawv tsawg zaus uas ua lub luag haujlwm tswj hwm yog hu ua lub teeb liab modulated.
Laser modulation tuaj yeem muab faib ua kev hloov kho sab hauv thiab sab nraud.
Internal modulation: Nws yog hais txog kev thauj khoom ntawm cov teeb liab modulated thaum lub sij hawm laser oscillation txheej txheem, uas yog, siv cov teeb liab modulated los hloov cov oscillation tsis ntawm lub laser, yog li hloov lub laser tso zis yam ntxwv kom ua tau modulation. Cov txheej txheem ntawm kev hloov kho sab hauv muaj xws li: 1. Ncaj qha tswj lub laser twj tso kua mis fais fab mov kom ua tiav qhov kev siv ntawm lub tshuab tso zis laser. Lub zog thiab muaj nyob ntawm cov zis yog txhua yam tswj los ntawm cov khoom siv fais fab. Yog tias lub teeb liab yuav tsum tau siv los tswj lub zog hluav taws xob laser, ua qhov kev hloov pauv tam sim no los ntawm laser tswj los ntawm lub teeb liab, ces lub emission laser kuj yuav tswj tau los ntawm lub teeb liab. 2. Modulation ntsiab yog muab tso rau hauv lub resonant kab noj hniav, thiab lub cev lub zog ntawm lub modulation ntsiab yog tswj los ntawm cov teeb liab hloov, yog li hloov cov tsis muaj resonant kab noj hniav thiab hloov lub laser tso zis yam ntxwv mus cuag modulation. Qhov zoo ntawm kev hloov kho sab hauv yog nws qhov kev ua haujlwm siab ua haujlwm siab. Lub drawback yog tias txij li thaum lub modulator tau muab tso rau hauv lub kab noj hniav, nws yog sib npaug rau nce qhov poob nyob rau hauv lub kab noj hniav, txo cov zis zog, thiab bandwidth ntawm lub modulator yog txwv los ntawm passband ntawm lub resonant kab noj hniav.
Sab nraud modulation: Nws yog hais txog qhov chaw ntawm lub modulator ntawm txoj kev kho qhov muag sab nraum lub laser tom qab lub laser yog tsim, thiab lub cev yam ntxwv ntawm lub modulator yog hloov los ntawm lub modulation teeb liab. Thaum lub laser hla dhau lub modulator, ib qho kev ntsuas ntawm lub teeb yoj yuav raug hloov kho. Qhov zoo ntawm kev hloov kho sab nraud yog tias nws tsis cuam tshuam rau lub zog tso zis ntawm lub laser thiab bandwidth ntawm lub tshuab hluav taws xob tsis txwv los ntawm passband ntawm lub resonant kab noj hniav. Lub drawback yog qhov tsawg modulation efficiency.
Laser modulation tuaj yeem muab faib ua amplitude modulation, zaus hloov kho, theem kev hloov kho thiab siv zog hloov kho, thiab lwm yam raws li nws qhov kev hloov kho. Cov kev sib raug zoo modulators suav nrogtheem modulators, siv zog modulators, thiab lwm yam. Dhau li ntawm aforementioned electro-optic intensity modulation thiab electro-optic phase modulation, Muaj ntau ntau homlaser modulators, xws li transverseelectro-optic modulators, electro-optic mus ncig yoj yoj modulators, Kerr electro-optic modulators, acousto-optic modulators, magneto-optic modulators, cuam tshuam modulators thiab spatial light modulators, thiab lwm yam.
Post lub sij hawm: May-13-2025