Uhlolojikelele lwamamojula amane ajwayelekile

Uhlolojikelele lwamamojula amane ajwayelekile

Leli phepha lethula izindlela ezine zokuguquguquka (ukushintsha i-laser amplitude kusizinda sesikhathi se-nanosecond noma se-subnanosecond) ezisetshenziswa kakhulu ezinhlelweni ze-fiber laser. Lokhu kufaka phakathi i-AOM (i-acousto-optic modulation), i-EOM (i-electro-optic modulation), i-SOM/I-SOA(i-semiconductor light amplification eyaziwa nangokuthi i-semiconductor modulation), kanyeukuguqulwa kwe-laser okuqondile. Phakathi kwabo, i-AOM,I-EOM,I-SOM ingeyokuguquguquka kwangaphandle, noma ukuguquguquka okungaqondile.

1. I-Acousto-optic Modulator (AOM)

I-Acousto-optic modulation iyinqubo ephathekayo esebenzisa umthelela we-acousto-optic ukulayisha ulwazi kunkampani yenethiwekhi yokubona. Lapho ushintsha, isignali kagesi (i-amplitude modulation) iqala ukusetshenziswa ku-electro-acoustic transducer, eguqula isignali kagesi ibe inkambu ye-ultrasonic. Uma igagasi lokukhanya lidlula endaweni ye-acousto-optic, isithwali esibonakalayo siyashintshwa futhi sibe ukuqina okuguquliwe kwegagasi elithwala ulwazi ngenxa yesenzo se-acousto-optic.

2. I-Electro-optical Modulator(EOM)

I-electro-optical modulator iyimoduli esebenzisa imiphumela ye-electro-optical yamakristalu athile e-electro-optical, njengamakristalu e-lithium niobate (LiNb03), amakristalu e-GaAs (GaAs) namakristalu e-lithium tantalate (LiTa03). Umphumela we-electro-optical uwukuthi lapho i-voltage isetshenziswa kukristalu ye-electro-optical, inkomba ye-refractive ye-electro-optical crystal izoshintsha, okuholela ekushintsheni kwezici zamagagasi okukhanya kwekristalu, kanye nokuguquguquka kwesigaba, amplitude, umfutho kanye polarization isimo isignali optical kuyabonakala.

Umfanekiso: Ukucushwa okujwayelekile kwesekethe yomshayeli we-EOM

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

I-Semiconductor optical amplifier (SOA) ivame ukusetshenziselwa ukukhulisa isignali ye-optical, enezinzuzo ze-chip, ukusetshenziswa kwamandla aphansi, ukusekelwa kwawo wonke amabhendi, njll., futhi ingenye indlela yesikhathi esizayo kuma-amplifiers optical wendabuko njenge-EDFA (I-Erbium-doped fiber amplifier). I-semiconductor optical modulator (SOM) iyithuluzi elifanayo ne-semiconductor optical amplifier, kodwa indlela esetshenziswa ngayo ihluke kancane endleleni esetshenziswa ngayo ne-SOA amplifier evamile, kanye nezinkomba egxila kuzo uma isetshenziswa njenge i-modulator ekhanyayo ihluke kancane kuleyo esetshenziswa njenge-amplifier. Uma isetshenziselwa ukukhulisa isignali ye-optical, okwamanje ukushayela okuzinzile kuvame ukunikezwa ku-SOA ukuqinisekisa ukuthi i-SOA isebenza endaweni eqondile; Uma isetshenziselwa ukulinganisa ama-optical pulses, ifaka amasignali optical aqhubekayo ku-SOA, isebenzisa ama-pulses kagesi ukuze ilawule i-SOA drive yamanje, bese ilawula isimo sokuphuma kwe-SOA njenge-amplification/attenuation. Ukusebenzisa i-SOA amplification kanye nezici zokunciphisa, le modulation mode kancane kancane isetshenziswe kwezinye izinhlelo zokusebenza ezintsha, ezifana ne-optical fibre sensing, i-LiDAR, imaging yezokwelapha ye-OCT nezinye izinkambu. Ikakhulukazi kwezinye izimo ezidinga umthamo ophezulu uma kuqhathaniswa, ukusetshenziswa kwamandla kanye nesilinganiso sokunyamalala.

4. Ukuguquguquka okuqondile kwe-Laser kungase futhi kushintshe isignali ye-optical ngokulawula ngokuqondile i-laser bias current, njengoba kuboniswe esithombeni esingezansi, ububanzi be-pulse ye-3 nanosecond butholakala ngokuguquguquka okuqondile. Kuyabonakala ukuthi kune-spike ekuqaleni kwe-pulse, elethwa ukuxegiswa kwe-laser carrier. Uma ufuna ukuthola ukushaya kwenhliziyo okungaba yi-100 picoseconds, ungasebenzisa lesi sipike. Kodwa ngokuvamile asifuni ukuba nalesi spike.

Fingqa

I-AOM ifanele ukuphuma kwamandla ngamawathi ambalwa futhi inomsebenzi wokushintsha imvamisa. I-EOM iyashesha, kodwa ubunkimbinkimbi bedrayivu buphezulu futhi isilinganiso sokuqothulwa siphansi. I-SOM (SOA) iyisixazululo esilungile sejubane le-GHz kanye nesilinganiso sokuqothulwa okuphezulu, ngokusetshenziswa kwamandla okuphansi, i-miniaturization nezinye izici. Ama-laser diode aqondile ayisixazululo esishibhe kakhulu, kodwa qaphela izinguquko ezicini ze-spectral. Uhlelo ngalunye lokuguquguquka lunezinzuzo nezinkinga zalo, futhi kubalulekile ukuqonda ngokunembile izidingo zohlelo lapho ukhetha uhlelo, futhi ujwayelane nezinzuzo nezinkinga zohlelo ngalunye, bese ukhetha uhlelo olufaneleka kakhulu. Isibonelo, ekuboneni i-fiber esatshalaliswayo, i-AOM yendabuko iyinhloko, kodwa kwezinye imiklamo yesistimu entsha, ukusetshenziswa kwezinhlelo ze-SOA kukhula ngokushesha, kwezinye izinhlelo zendabuko ze-wind liDAR zisebenzisa i-AOM yezigaba ezimbili, umklamo omusha wohlelo ukuze ukunciphisa izindleko, ukunciphisa usayizi, futhi uthuthukise isilinganiso sokuqothulwa, uhlelo lwe-SOA luyamukelwa. Ohlelweni lokuxhumana, isistimu yejubane eliphansi imvamisa ithatha isikimu sokuguquguquka okuqondile, futhi isistimu yesivinini esikhulu ivamise ukusebenzisa uhlelo lokumodela i-electro-optic.