Isishwankathelo see-modulators ezine eziqhelekileyo

Isishwankathelo see-modulators ezine eziqhelekileyo

Eli phepha lizisa iindlela ezine zokuguqula (ukutshintsha i-amplitude ye-laser kwi-nanosecond okanye kwi-subnanosecond time domain) ezisetyenziswa kakhulu kwiinkqubo ze-fiber laser. Ezi ziquka i-AOM (acousto-optic modulation), i-EOM (electro-optic modulation), i-SOM/I-SOA(ukukhulisa ukukhanya kwe-semiconductor okwaziwa ngokuba yi-semiconductor modulation), kunyeukuguquguquka kwelaser ngqoPhakathi kwabo, i-AOM,I-EOM,I-SOM yeyokuguqulwa kwangaphandle, okanye ukuguqulwa okungathanga ngqo.

1. I-Acousto-optic Modulator (AOM)

Ukuguqulwa kwe-Acousto-optic yinkqubo ebonakalayo esebenzisa isiphumo se-acousto-optic ukulayisha ulwazi kwi-optical carrier. Xa kuguqulwa, isignali yombane (i-amplitude modulation) isetyenziswa kuqala kwi-electro-acoustic transducer, eguqula isignali yombane ibe yintsimi ye-ultrasonic. Xa iliza lokukhanya lidlula kwi-acousto-optic medium, i-optical carrier iyaguqulwa kwaye ibe lulwazi oluthwala amaza oluguqulwe ngamandla ngenxa yesenzo se-acousto-optic.

2. I-Electro-optical Modulator(EOM)

I-electro-optical modulator yi-modulator esebenzisa iziphumo ze-electro-optical zeekristale ezithile ze-electro-optical, ezifana neekristale ze-lithium niobate (LiNb03), iikristale ze-GaAs (GaAs) kunye neekristale ze-lithium tantalate (LiTa03). Isiphumo se-electro-optical kukuba xa i-voltage isetyenziswa kwikristale ye-electro-optical, i-refractive index ye-electro-optical crystal iya kutshintsha, nto leyo ekhokelela kutshintsho kwiimpawu zamaza okukhanya kwekristale, kwaye ukuguqulwa kwesigaba, ubukhulu, intensity kunye nemeko ye-polarization yesignali ye-optical kuyafezekiswa.

Umfanekiso: Uqwalaselo oluqhelekileyo lwesekethe yomqhubi we-EOM

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

I-amplifier ye-semiconductor optical (SOA) idla ngokusetyenziselwa ukukhulisa isignali ye-optical, enezibonelelo ze-chip, ukusetyenziswa kwamandla aphantsi, inkxaso yazo zonke iibhendi, njl.njl., kwaye yindlela yexesha elizayo yokwandisa ii-amplifier ze-optical zemveli ezifana ne-EDFA (Isikhulisi sefayibha esifakwe i-Erbium). I-semiconductor optical modulator (SOM) sisixhobo esifanayo ne-semiconductor optical amplifier, kodwa indlela esetyenziswa ngayo yahlukile kancinci kwindlela esetyenziswa ngayo ne-SOA amplifier yendabuko, kwaye izalathisi ezigxila kuzo xa zisetyenziswa njenge-light modulator zahlukile kancinci kwezo zisetyenziswa njenge-amplifier. Xa zisetyenziselwa ukukhulisa isignali ye-optical, umsinga wokuqhuba ozinzileyo uhlala unikezelwa kwi-SOA ukuqinisekisa ukuba i-SOA isebenza kummandla othe ngqo; Xa zisetyenziselwa ukuguqula ii-optical pulses, zifaka imiqondiso ye-optical eqhubekayo kwi-SOA, zisebenzisa ii-electrical pulses ukulawula umsinga wokuqhuba we-SOA, kwaye emva koko zilawula imeko yemveliso ye-SOA njengokukhulisa/ukunciphisa. Zisebenzisa iimpawu ze-SOA amplification kunye nokunciphisa, le modulation mode iye yasetyenziswa kancinci kwezinye izicelo ezintsha, ezifana ne-optical fiber sensing, i-LiDAR, i-OCT medical imaging kunye nezinye iindawo. Ingakumbi kwezinye iimeko ezifuna i-volume ephezulu, ukusetyenziswa kwamandla kunye nomlinganiselo wokuphela.

4. I-laser direct modulation ingakwazi nokuguqula isignali ye-optical ngokulawula ngokuthe ngqo i-laser bias current, njengoko kubonisiwe kumfanekiso ongezantsi, ububanzi be-pulse ye-nanosecond ezi-3 bufunyanwa nge-direct modulation. Kuyabonakala ukuba kukho i-spike ekuqaleni kwe-pulse, ebangelwa kukukhululeka kwe-laser carrier. Ukuba ufuna ukufumana i-pulse ye-picoseconds ezimalunga ne-100, ungasebenzisa le spike. Kodwa ngokuqhelekileyo asifuni ukuba nale spike.

Shwankathela

I-AOM ifanelekile kwimveliso yamandla okukhanya kwiiwatts ezimbalwa kwaye inomsebenzi wokutshintsha rhoqo. I-EOM iyakhawuleza, kodwa ubunzima bokuqhuba buphezulu kwaye umlinganiselo wokuphela uphantsi. I-SOM (SOA) sisisombululo esifanelekileyo sesantya se-GHz kunye nomlinganiselo wokuphela ophezulu, kunye nokusetyenziswa kwamandla okuphantsi, i-miniaturization kunye nezinye iimpawu. Ii-diode ze-laser ezithe ngqo zezona sisombululo zibiza kancinci, kodwa qaphela utshintsho kwiimpawu ze-spectral. Iskimu ngasinye sokuguqula sineenzuzo kunye nokungalungi kwaso, kwaye kubalulekile ukuqonda ngokuchanekileyo iimfuno zesicelo xa ukhetha iskimu, kwaye uqhelane neenzuzo kunye nokungalungi kweskimu ngasinye, kwaye ukhethe iskimu esifanelekileyo. Umzekelo, kwi-distributed fiber sensing, i-AOM yendabuko yeyona iphambili, kodwa kwezinye uyilo lwenkqubo entsha, ukusetyenziswa kwezicwangciso ze-SOA kukhula ngokukhawuleza, kwezinye izicwangciso zemveli ze-liDAR zomoya zisebenzisa i-AOM enamanqanaba amabini, uyilo olutsha lweskimu ukuze kuncitshiswe iindleko, kuncitshiswe ubungakanani, kwaye kuphuculwe umlinganiselo wokuphela, iskimu se-SOA siyamkelwa. Kwinkqubo yonxibelelwano, inkqubo yesantya esiphantsi idla ngokusebenzisa iskimu sokuguqula ngqo, kwaye inkqubo yesantya esiphezulu idla ngokusebenzisa iskimu sokuguqula i-electro-optic.