Okokuqala, ukuguquguquka kwangaphakathi kunye nokuguquguquka kwangaphandle
Ngokwendlela enxulumene ngayo nolwalamano phakathi kwe-modulator kunye ne-laser,ukuguquguquka kwelezainokwahlulwahlulwa ibe yi-internal modulation kunye ne-external modulation.
01 uhlengahlengiso lwangaphakathi
Isignali yokuguqula yenziwa kwinkqubo yokujikeleza kwelaser, oko kukuthi, iiparameter zokujikeleza kwelaser ziyatshintshwa ngokomthetho wesignali yokuguqula, ukuze kutshintshwe iimpawu zokuphuma kwelaser kwaye kufezekiswe ukuguquguquka.
(1) Lawula ngokuthe ngqo umthombo wepompo yelaser ukuze ufezekise ukuguqulwa kobunzulu belaser ephumayo kunye nokuba ikhona na, ukuze ilawulwe ngumbane.
(2) I-modulation element ibekwa kwi-resonator, kwaye utshintsho lweempawu zomzimba ze-modulation element lulawulwa yisignali yokutshintsha iiparameter ze-resonator, ngaloo ndlela itshintsha iimpawu zemveliso ye-laser.
02 Ukuguqulwa kwangaphandle
Ukuguqulwa kwangaphandle kukwahlula ukuveliswa kunye nokuguqulwa kwelaser. Kubhekisa ekulayishweni kwesignali eguquliweyo emva kokwenziwa kwelaser, oko kukuthi, i-modulator ibekwa kwindlela yokukhanya ngaphandle kwe-resonator yelaser.
I-voltage yesignali ye-modulation yongezwa kwi-modulator ukwenza ezinye iimpawu zomzimba zesigaba se-modulator zitshintshe, kwaye xa i-laser idlula kuyo, ezinye iiparameter ze-light wave ziyaguqulwa, ngaloo ndlela zithwala ulwazi oluza kudluliselwa. Ke ngoko, i-external modulation ayikokutshintsha iiparameter ze-laser, kodwa kukutshintsha iiparameter ze-output laser, ezifana nobukhali, i-frequency, njalo njalo.
Isibini,i-modulator yelezaukuhlelwa
Ngokwendlela yokusebenza yemodulator, inokwahlulwahlulwa ibeukuguquguquka kwe-electro-optic, i-acoustooptic modulation, i-magneto-optic modulation kunye ne-direct modulation.
01 Ukuguqulwa ngokuthe ngqo
Umsinga oqhubayo wei-laser ye-semiconductorokanye i-diode ekhupha ukukhanya ilawulwa ngokuthe ngqo yisignali yombane, ukuze ukukhanya okuphumayo kulawulwe ngokutshintsha kwesignali yombane.
(1) Ukuguqulwa kweTTL kwi-modulation ethe ngqo
Isignali yedijithali ye-TTL yongezwa kumbane we-laser, ukuze umsinga we-laser drive ulawulwe ngesignali yangaphandle, uze emva koko i-frequency yemveliso ye-laser ilawulwe.
(2) Ukuguqulwa kwe-analog kwi-modulation ethe ngqo
Ukongeza kwisignali ye-analog yombane we-laser (ububanzi obungaphantsi kwe-5V, i-wave yesignali yotshintsho olungaqhelekanga), ingenza i-voltage eyahlukileyo yesignali yangaphandle ifake i-laser drive current, ize ilawule amandla e-laser aphumayo.
02 Ukuguqulwa kwe-Electro-optic
Ukuguqulwa kwe-electro-optic effect kubizwa ngokuba yi-electro-optic modulation. Isiseko esibonakalayo se-electro-optic modulation yi-electro-optic effect, oko kukuthi, phantsi kwesenzo sentsimi yombane esetyenzisiweyo, i-refractive index yeekristale ezithile iya kutshintsha, kwaye xa i-light wave idlula kule medium, iimpawu zayo zokudlulisela ziya kuchaphazeleka kwaye zitshintshwe.
03 Ukuguqulwa kwe-Acousto-optic
Isiseko esibonakalayo se-acousto-optic modulation yi-acousto-optic effect, ebhekisa kwinto yokuba amaza okukhanya ayasasazwa okanye asasazwa yintsimi yamaza angaphezu kwawemvelo xa esasazeka kwi-medium. Xa i-refractive index ye-medium itshintsha rhoqo ukuze yenze i-refractive index grating, i-diffraction iya kwenzeka xa i-light wave isasazeka kwi-medium, kwaye ubunzulu, i-frequency kunye ne-direction yokukhanya kwe-diffractive ziya kutshintsha ngokutshintsha kwentsimi yamaza angaphezulu.
Ukuguqulwa kwe-Acousto-optic yinkqubo ebonakalayo esebenzisa isiphumo se-acousto-optic ukulayisha ulwazi kwi-optical frequency carrier. Isignali eguquliweyo isebenza kwi-electro-acoustic transducer ngohlobo lwesignali yombane (i-amplitude modulation), kwaye isignali yombane ehambelanayo iguqulwa ibe yintsimi ye-ultrasonic. Xa igagasi lokukhanya lidlula kwi-acousto-optic medium, i-optical carrier iyaguquguqulwa kwaye ibe yigagasi eguquliweyo yobunzulu "ethwala" ulwazi.
04 Ukuguqulwa kweMagneto-optical
I-Magneto-optic modulation yindlela yokusebenzisa i-Faraday's electromagnetic optical rotation effect. Xa amaza okukhanya esasazeka nge-magneto-optical medium ehambelana necala le-magnetic field, i-phenomenon yokujikeleza kwe-polarization plane yokukhanya oku-linearly polarized ibizwa ngokuba yi-magnetic rotation.
Intsimi yemagnethi engaguqukiyo isetyenziswa kwi-medium ukuze kufunyanwe i-magnetic saturation. Icala lentsimi yemagnethi yesekethe likwicala le-axial le-medium, kwaye ukujikeleza kweFaraday kuxhomekeke kwi-axial current magnetic field. Ke ngoko, ngokulawula umbane we-coil ephezulu kunye nokutshintsha amandla e-magnetic field yesignali ye-axial, i-Angle yokujikeleza yeplani yokudlidliza kwe-optical inokulawulwa, ukuze i-amplitude yokukhanya nge-polarizer itshintshe ngokutshintsha kwe-θ Angle, ukuze kufezekiswe i-modulation.
Ixesha leposi: Jan-08-2024