Isishwankathelo seemodyuli ezine eziqhelekileyo

Isishwankathelo seemodyuli ezine eziqhelekileyo

Eli phepha lizisa iindlela ezine zokumodareyitha (ukutshintsha i-laser amplitude kwi-nanosecond okanye i-subnanosecond time domain) ezisetyenziswa ngokuqhelekileyo kwiinkqubo ze-fiber laser. Ezi ziquka i-AOM (i-acousto-optic modulation), i-EOM (i-electro-optic modulation), i-SOM/SOA(i-semiconductor light amplification eyaziwa ngokuba yi-semiconductor modulation), kunyeukuguqulwa kwe-laser ngqo. Phakathi kwabo, i-AOM,EOM,I-SOM yeyemodyuli yangaphandle, okanye imodyuli engathanga ngqo.

1. IModyuli yeAcousto-optic (AOM)

I-acousto-optic modulation yinkqubo yomzimba esebenzisa i-acousto-optic effect ukulayisha ulwazi kwi-optical carrier. Xa uhlengahlengiso, isignali yombane (i-amplitude modulation) iqala ukusetyenziswa kwi-transducer ye-electro-acoustic, eguqula umqondiso wombane kwintsimi ye-ultrasonic. Xa iliza lokukhanya lidlula kwi-acousto-optic medium, isithwali sokukhanya siyamodareyithwa kwaye sibe bubunzulu obuguquliweyo obuguquguqukayo obuthwele ulwazi ngenxa yesenzo se-acousto-optic.

2. I-Electro-optical Modulator(EOM)

I-electro-optical modulator yi-modulator esebenzisa i-electro-optical effects ye-electro-optical crystals ethile, njenge-lithium niobate crystals (LiNb03), i-crystals ye-GaAs (i-GaAs) kunye ne-lithium tantalate crystals (LiTa03). Impembelelo ye-electro-optical kukuba xa i-voltage isetyenziswa kwikristale ye-electro-optical, isalathiso se-refractive sekristale ye-electro-optical siya kutshintsha, okukhokelela kutshintsho kwiimpawu zamaza okukhanya kwekristale, kunye nokumodareyithwa kwesigaba, i-amplitude, intensity kunye ne-polarization state ye-optical signal iyenzeka.

Umzobo: Ubumbeko oluqhelekileyo lwesekethe yomqhubi we-EOM

3. I-Semiconductor Optical Modulator/Semiconductor Optical amplifier (SOM/SOA)

I-Semiconductor optical amplifier (SOA) idla ngokusetyenziselwa ukukhulisa umqondiso we-optical, enenzuzo ye-chip, ukusetyenziswa kwamandla aphantsi, inkxaso yazo zonke iibhendi, njl.I-Erbium-doped fiber amplifier). I-semiconductor optical modulator (SOM) sisixhobo esifanayo njenge-semiconductor optical amplifier, kodwa indlela esetyenziswa ngayo ihluke kancinane kwindlela esetyenziswa ngayo kunye ne-SOA amplifier yendabuko, kunye nezalathi ezigxininise kuzo xa zisetyenziswa njenge imodyuli yokukhanya yahluke kancinane kwezo zisetyenziswa njengeamplifier. Xa isetyenziselwa ukukhulisa umqondiso we-optical, i-stable current drive current idla ngokunikezelwa kwi-SOA ukuze kuqinisekiswe ukuba i-SOA isebenza kummandla womgca; Xa isetyenziselwa ukumodareyitha i-optical pulses, ifaka izibonakaliso ze-optical eziqhubekayo kwi-SOA, isebenzisa ii-pulses zombane ukulawula i-SOA drive yangoku, kwaye emva koko ilawule i-SOA ye-output state njenge-amplification / attenuation. Ukusebenzisa i-SOA yokukhulisa kunye neempawu zokunciphisa, le ndlela yokumodareyitha isetyenziswe ngokuthe ngcembe kwezinye izicelo ezintsha, ezifana ne-fiber optical sensing, i-LiDAR, i-OCT yonyango ye-oCT kunye nezinye iinkalo. Ngokukodwa kwezinye iimeko ezifuna umthamo ophezulu, ukusetyenziswa kwamandla kunye nomlinganiselo wokuphela.

4. Ukumodareyitha ngokuthe ngqo kwe-Laser nako kunokulungelelanisa umqondiso we-optical ngokulawula ngokuthe ngqo i-laser bias current, njengoko kuboniswe kumzobo ongezantsi, i-3 nanosecond pulse wide ifumaneka ngokumodareyitha ngokuthe ngqo. Ingabonwa ukuba kukho i-spike ekuqaleni kwe-pulse, eziswa ngokukhululeka kwe-laser carrier. Ukuba ufuna ukufumana ipulse malunga ne-100 picoseconds, ungasebenzisa esi spike. Kodwa ngokwesiqhelo asifuni kuba nesi spike.

Shwankathela

I-AOM ifanelekile kwimveliso yamandla optical kwiiwatts ezimbalwa kwaye inomsebenzi wokutshintsha rhoqo. I-EOM ikhawuleza, kodwa ubunzima bokuqhuba buphezulu kwaye umlinganiselo wokuphela uphantsi. I-SOM (i-SOA) yisisombululo esona sisombululo sesantya se-GHz kunye nomlinganiselo ophezulu wokuphela, kunye nokusetyenziswa kwamandla aphantsi, i-miniaturization kunye nezinye iimpawu. Iidiode ze-laser ezithe ngqo zezona sisombululo zincinci, kodwa qaphela utshintsho kwiimpawu ze-spectral. Isikimu ngasinye sokumodareyitha sineengenelo kunye nokungonakali, kwaye kubalulekile ukuqonda ngokuchanekileyo iimfuno zesicelo xa ukhetha iskimu, kwaye uqhelane neengenelo kunye nokungalunganga kwesikimu ngasinye, kwaye ukhethe iskimu esifanelekileyo. Ngokomzekelo, kwi-fiber sensing esasazwayo, i-AOM yendabuko iyona nto iphambili, kodwa kwezinye iindlela zoyilo zenkqubo entsha, ukusetyenziswa kwezicwangciso ze-SOA kukhula ngokukhawuleza, kwezinye ii-wind liDAR izikimu zemveli zisebenzisa i-AOM yamanqanaba amabini, isicwangciso esitsha soyilo ukwenzela ukuba ukunciphisa iindleko, ukunciphisa ubungakanani, kunye nokuphucula umlinganiselo wokuphela, iskimu se-SOA samkelwe. Kwinkqubo yonxibelelwano, inkqubo yesantya esezantsi idla ngokuthatha iskimu sokumodareyitha ngokuthe ngqo, kwaye inkqubo yesantya esiphezulu idla ngokusebenzisa i-electro-optic modulation scheme.