Hwirudzuro yeana akajairika modulators

Hwirudzuro yeana akajairika modulators

Iri bepa rinosuma nzira ina dzemodulation (kuchinja laser amplitude mu nanosecond kana subnanosecond time domain) idzo dzinonyanya kushandiswa mune fiber laser system. Izvi zvinosanganisira AOM (acousto-optic modulation), EOM (electro-optic modulation), SOM/SOA(semiconductor light amplification inozivikanwawo semiconductor modulation), uyeyakananga laser modulation. Pakati pavo, AOM,EOM,SOM ndeyekumwe modulation, kana kunanga modulation.

1. Acousto-optic Modulator (AOM)

Acousto-optic modulation inzira yemuviri inoshandisa acousto-optic athari kurodha ruzivo pane inotakura inotakura. Paunenge uchigadzirisa, chiratidzo chemagetsi (amplitude modulation) chinotanga kuiswa kune electro-acoustic transducer, iyo inoshandura chiratidzo chemagetsi kuita ultrasonic munda. Kana iyo mwenje wave ichipfuura nepakati acousto-optic yepakati, iyo inotakura yemaziso inogadziriswa uye inova intensity modulated wave inotakura ruzivo nekuda kweacousto-optic chiito.

2. Electro-optical Modulator(EOM)

Electro-optical modulator is a modulator inoshandisa electro-optical effects yemamwe electro-optical crystals, akadai se lithium niobate crystals (LiNb03), GaAs crystals (GaAs) uye lithium tantalate crystals (LiTa03). Iyo electro-optical mhedzisiro ndeyekuti kana magetsi akaiswa kune electro-optical crystal, iyo refractive index ye electro-optical crystal inoshanduka, zvichikonzera shanduko muchiedza wave maitiro ekristaro, uye modulation yechikamu. amplitude, intensity uye polarization mamiriro eiyo optical chiratidzo inoitika.

Mufananidzo: Yakajairika gadziriso yeEOM mutyairi wedunhu

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

Semiconductor optical amplifier (SOA) inowanzo shandiswa kune optical signal amplification, iyo ine zvakanakira chip, yakaderera simba rekushandisa, kutsigirwa kwese mabhendi, nezvimwewo, uye ndiyo imwe nzira yeramangwana kune echinyakare optical amplifiers senge EDFA (Erbium-doped fiber amplifier) Semiconductor optical modulator (SOM) ndiyo imwe mudziyo semiconductor optical amplifier, asi mashandisirwo ayo akasiyana zvishoma nemashandisirwo ainoitwa neSOA amplifier yechinyakare, uye zviratidzo zvaanotarisa pazvinoshandiswa se light modulator yakati siyanei neaya anoshandiswa seamplifier. Kana yakashandiswa kukwidziridzwa kwechiratidzo che optical, ikozvino yakagadzikana yekutyaira inowanzopiwa kune SOA kuti ive nechokwadi chokuti SOA inoshanda munharaunda yakarongeka; Kana ichishandiswa kuenzanisa pulses optical, inopinza zviratidzo zvinoramba zvichiitika kune SOA, inoshandisa magetsi emagetsi kudzora SOA drive ikozvino, uye inodzora iyo SOA yekubuda mamiriro seamplification / attenuation. Uchishandisa iyo SOA amplification uye attenuation maitiro, iyi modulation mode yave ichishandiswa zvishoma nezvishoma kune mamwe maapplication matsva, senge optical fiber sensing, LiDAR, OCT yekurapa imaging uye mamwe minda. Kunyanya kune mamwe mamiriro anoda huwandu hwepamusoro, mashandisiro emagetsi uye reshiyo yekutsakatika.

4. Laser yakananga modulation inogonawo kugadzirisa chiratidzo chemaziso nekudzora zvakananga laser bias ikozvino, sezvinoratidzwa mumufananidzo uri pasi apa, 3 nanosecond pulse width inowanikwa kuburikidza nekugadzirisa zvakananga. Zvinogona kuoneka kuti kune spike pakutanga kwe pulse, iyo inounzwa nekuzorora kweiyo laser carrier. Kana iwe uchida kuwana kupomba kweanenge zana picoseconds, unogona kushandisa spike iyi. Asi kazhinji isu hatidi kuve ne spike iyi.

Sum up

AOM inokodzera optical simba kubuda mune mashoma watts uye ine frequency shift basa. EOM inokurumidza, asi kuomarara kwekutyaira kwakakwira uye chiyero chekutsakatika chakaderera. SOM (SOA) ndiyo yakakwana mhinduro yeGHz kumhanya uye yakakwirira yekudzima ratio, ine yakaderera simba rekushandisa, miniaturization uye zvimwe zvinhu. Yakananga laser diodes ndiyo yakachipa mhinduro, asi ziva nezve shanduko mune yespectral maitiro. Imwe neimwe modulation scheme ine zvayakanakira nezvayakaipira, uye zvakakosha kuti unzwisise nemazvo zvinodiwa zvekushandisa pakusarudza chirongwa, uye kujairana nezvakanakira nekuipira kwechirongwa chega chega, uye sarudza iyo yakanyatsokodzera chirongwa. Semuenzaniso, mukugovera fiber sensing, iyo yechinyakare AOM ndiyo huru, asi mune mamwe magadzirirwo ehurongwa hutsva, kushandiswa kweSOA zvirongwa kuri kukura nekukurumidza, mune dzimwe mhepo liDAR zvechinyakare zvirongwa zvinoshandisa maviri-nhanho AOM, iyo nyowani chirongwa chekugadzira kuitira kuderedza mutengo, kuderedza ukuru, uye kugadzirisa chiyero chekutsakatika, chirongwa cheSOA chinogamuchirwa. Muhurongwa hwekutaurirana, iyo yakaderera yekumhanyisa system inowanzo tora yakananga modulation scheme, uye iyo yekumhanyisa system inowanzo shandisa iyo electro-optic modulation scheme.