Kakaretso ea li-modulator tse 'nè tse tloaelehileng

Kakaretso ea li-modulator tse 'nè tse tloaelehileng

Pampiri ena e hlahisa mekhoa e mene ea modulation (ho fetola amplitude ea laser sebakeng sa nanosecond kapa subnanosecond time domain) e sebelisoang haholo lits'ebetsong tsa laser fiber. Tsena li kenyelletsa AOM (acousto-optic modulation), EOM (electro-optic modulation), SOM/SOA(semiconductor light amplification e tsejoang hape e le semiconductor modulation), leho feto-fetoha ha laser ka ho toba. Har'a bona, AOM,EOM,SOM ke ea modulation ea kantle, kapa modulation e sa tobang.

1. Acousto-optic Modulator (AOM)

Acousto-optic modulation ke ts'ebetso ea 'mele e sebelisang phello ea acousto-optic ho kenya tlhahisoleseling ho optical carrier. Ha ho feto-fetoha, lets'oao la motlakase (amplitude modulation) le qala ho sebelisoa ho transducer ea electro-acoustic, e fetolang lets'oao la motlakase hore e be tšimo ea ultrasonic. Ha leqhubu la leseli le feta har'a acousto-optic medium, mochini o tsamaisang mahlo oa fetoloa 'me o fetoha leqhubu le matla le tsamaisang tlhahisoleseling ka lebaka la ketso ea acousto-optic.

2. Electro-optical Modulator(EOM)

Mochine oa motlakase oa motlakase ke mochine o sebelisang liphello tsa electro-optical tsa likristale tse itseng tsa electro-optical, tse kang lithium niobate crystals (LiNb03), GaAs crystals (GaAs) le lithium tantalate crystals (LiTa03). Phello ea elektro-optical ke hore ha motlakase o sebelisoa ho kristale ea electro-optical, index ea refractive ea kristale ea electro-optical e tla fetoha, e leng se bakang liphetoho litšoanelehong tsa leqhubu la leseli la kristale, le ho feto-fetoha ha mokhahlelo. boemo ba amplitude, matla le polarization ea pontšo ea optical e phethahala.

Setšoantšo: Tlhophiso e tloaelehileng ea potoloho ea mokhanni oa EOM

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

Semiconductor optical amplifier (SOA) hangata e sebelisoa bakeng sa amplification ea optical signal, e nang le melemo ea chip, tšebeliso e tlaase ea matla, tšehetso bakeng sa lihlopha tsohle, joalo-joalo, 'me ke mokhoa o mong oa nakong e tlang ho li-amplifiers tsa setso tse kang EDFA (Erbium-doped fiber amplifier). Semiconductor optical modulator (SOM) ke sesebelisoa se ts'oanang le semiconductor optical amplifier, empa tsela eo e sebelisoang ka eona e fapane hanyane le tsela eo e sebelisoang ka eona le sebuela-pele sa SOA se tloaelehileng, le matšoao ao a tsepamisang maikutlo ho ona ha a sebelisoa e le Modulator e bobebe e fapane hanyane le e sebelisoang joalo ka seholisa. Ha e sebelisoa bakeng sa amplification ea optical signal, mochine o tsitsitseng oa ho khanna o atisa ho fanoa ho SOA ho etsa bonnete ba hore SOA e sebetsa sebakeng sa moeli; Ha e sebelisoa ho fetola li-pulses tsa optical, e kenya lipontšo tse tsoelang pele tsa optical ho SOA, e sebelisa li-pulse tsa motlakase ho laola SOA drive ea hona joale, ebe e laola boemo ba SOA e le amplification / attenuation. Ho sebelisa SOA amplification le litšoaneleho tsa attenuation, mokhoa ona oa ho feto-fetoha o 'nile oa sebelisoa butle-butle lits'ebetsong tse ling tse ncha, tse kang optical fiber sensing, LiDAR, imaging ea bongaka ea OCT le likarolo tse ling. Haholo-holo bakeng sa maemo a mang a hlokang molumo o batlang o le holimo, tšebeliso ea matla le karolelano ea ho timela.

4. Ho feto-fetoha ha laser ka ho toba ho ka boela ha fetola pontšo ea optical ka ho laola ka ho toba sekhahla sa laser bias, joalokaha ho bontšitsoe setšoantšong se ka tlase, bophara ba 3 nanosecond pulse bo fumanoa ka ho feto-fetoha ka ho toba. Ho ka bonoa hore ho na le spike qalong ea pulse, e tlisoang ke ho phomola ha mochine oa laser. Haeba u batla ho fumana matla a ka bang 100 picoseconds, u ka sebelisa spike ena. Empa hangata ha re batle ho ba le spike ena.

Akaretsa

AOM e loketse tlhahiso ea matla a optical ka li-watts tse 'maloa mme e na le tšebetso ea frequency shift. EOM e potlakile, empa ho rarahana ha koloi ho phahame mme tekanyo ea ho fela e tlase. SOM (SOA) ke tharollo e nepahetseng bakeng sa lebelo la GHz le tekanyo e phahameng ea ho timela, e nang le tšebeliso e tlaase ea matla, miniaturization le likarolo tse ling. Li-laser diode tse otlolohileng ke tharollo e theko e tlaase, empa hlokomela liphetoho tsa litšobotsi tsa spectral. Sekema se seng le se seng sa modulation se na le melemo le mefokolo ea sona, 'me ke habohlokoa ho utloisisa ka nepo litlhoko tsa kopo ha u khetha moralo,' me u tsebe melemo le bofokoli ba morero ka mong, 'me u khethe moralo o loketseng ka ho fetisisa. Ka mohlala, ho ajoa ha fiber sensing, AOM ea setso ke eona e ka sehloohong, empa meralong e meng e mecha ea tsamaiso, tšebeliso ea merero ea SOA e ntse e hōla ka potlako, mefuteng e meng ea moea liDAR merero ea setso e sebelisa AOM ea mekhahlelo e 'meli, moralo o mocha oa morero e le ho fokotsa litšenyehelo, fokotsa boholo, 'me u ntlafatse tekanyo ea ho timela, morero oa SOA oa amoheloa. Tsamaisong ea puisano, tsamaiso ea lebelo le tlaase hangata e nka mokhoa o tobileng oa ho feto-fetoha ha molumo, 'me tsamaiso ea lebelo le phahameng hangata e sebelisa mochine oa electro-optic modulation.