Pfupiso yemamodulator mana akajairika

Pfupiso yemamodulator mana akajairika

Pepa rino rinopa nzira ina dzekushandura (kuchinja amplitude yelaser mu nanosecond kana subnanosecond time domain) idzo dzinonyanya kushandiswa muma fiber laser systems. Idzi dzinosanganisira AOM (acousto-optic modulation), EOM (electro-optic modulation), SOM/SOA(semiconductor light amplification inozivikanwawo se semiconductor modulation), uyemodulation yelaser yakanangaPakati pavo, AOM,EOM,SOM ndeye external modulation, kana kuti indirect modulation.

1. Modulator yeAcousto-optic (AOM)

Kuchinja kweAcousto-optic inzira inoshandiswa nemuviri inoshandisa acousto-optic effect kuisa ruzivo pa optical carrier. Pakuchinja, chiratidzo chemagetsi (amplitude modulation) chinotanga chashandiswa pa electro-acoustic transducer, iyo inoshandura chiratidzo chemagetsi kuita ultrasonic field. Kana wave yechiedza inopfuura nepakati pe acousto-optic medium, optical carrier inogadziriswa uye inova intensity modulated wave carrier information nekuda kwe acousto-optic action.

2. Modulator yeElectro-Optical(EOM)

Electro-optical modulator imodulator inoshandisa electro-optical effects yemamwe ma electro-optical crystals, akadai se lithium niobate crystals (LiNb03), GaAs crystals (GaAs) uye lithium tantalate crystals (LiTa03). Electro-optical effect ndeyekuti kana voltage ikashandiswa pa electro-optical crystal, refractive index ye electro-optical crystal inochinja, zvichikonzera shanduko mu light wave characteristics ye crystal, uye modulation ye phase, amplitude, intensity uye polarization state ye optical signal inowanikwa.

Mufananidzo: Magadzirirwo akajairika edunhu remutyairi weEOM

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

Semiconductor optical amplifier (SOA) inowanzo shandiswa pakuwedzera masaini emagetsi, ayo ane mabhenefiti echip, kushandiswa kwesimba shoma, rutsigiro rwemabhendi ese, nezvimwewo, uye isarudzo yeramangwana pane ma amplifier emagetsi echinyakare akadai seEDFA (Amplifier yefayibha yakasanganiswa neErbium). Semiconductor optical modulator (SOM) chishandiso chimwe chete ne semiconductor optical amplifier, asi mashandisirwo ainoitwa akasiyana zvishoma nemashandisirwo ainoitwa ne SOA amplifier yechinyakare, uye zviratidzo zvainotarisa pazvinoshandiswa se light modulator zvakasiyana zvishoma nezvinoshandiswa se amplifier. Kana zvichishandiswa pakuwedzera masaini e optical, stable driving current inowanzo kupihwa ku SOA kuti ive nechokwadi chekuti SOA inoshanda munzvimbo yakatsetseka; Kana ichishandiswa kugadzirisa ma pulse e optical, inopinza ma continuous optical signals ku SOA, inoshandisa ma electrical pulses kudzora SOA drive current, uye yozodzora SOA output state se amplification/attenuation. Ichishandisa SOA amplification and attenuation characteristics, iyi modulation mode yakashandiswa zvishoma nezvishoma kune mamwe maapplication matsva, akadai se optical fiber sensing, LiDAR, OCT medical imaging nedzimwe nzvimbo. Kunyanya kune mamwe mamiriro anoda huwandu hwakawanda, simba rekushandisa uye extinction ratio.

4. Kuchinja kweLaser direct kunogonawo kugadzirisa chiratidzo che optical nekudzora zvakananga laser bias current, sezvakaratidzwa mumufananidzo uri pazasi, 3 nanosecond pulse width inowanikwa kuburikidza nekuchinja kwakananga. Zvinogona kuonekwa kuti pane spike pakutanga kwepulse, iyo inokonzerwa nekurerukirwa kwe laser carrier. Kana uchida kuwana pulse yeinenge 100 picoseconds, unogona kushandisa spike iyi. Asi kazhinji hatidi kuva nespike iyi.

Muchidimbu

AOM yakakodzera kuburitsa simba remagetsi muma watts mashoma uye ine basa rekuchinja frequency. EOM inokurumidza, asi kuoma kwedhiraivha kwakakwira uye chiyero chekudzima chakaderera. SOM (SOA) ndiyo mhinduro yakanakisisa yeGHz speed uye high disaption ratio, ine simba shoma rinoshandiswa, miniaturization nezvimwe zvinhu. Direct laser diodes ndiyo mhinduro yakachipa, asi ziva shanduko muhunhu hwe spectral. Yega yega modulation scheme ine zvayakanakira nezvayakaipira, uye zvakakosha kunzwisisa zvinodiwa zvekushandisa pakusarudza scheme, uye kuziva zvayakanakira nezvayakaipira zve scheme yega yega, uye kusarudza scheme yakakodzera. Semuenzaniso, mukunzwa fiber yakapararira, AOM yechinyakare ndiyo huru, asi mune mamwe magadzirirwo matsva esystem, kushandiswa kweSOA schemes kuri kukura nekukurumidza, mune mamwe ma scheme echinyakare e wind liDAR anoshandisa two-stage AOM, dhizaini itsva ye scheme kuitira kuderedza mutengo, kuderedza saizi, uye kuvandudza disaption ratio, SOA scheme inotorwa. Mu communication system, low speed system inowanzo tora direct modulation scheme, uye high speed system inowanzo shandisa electro-optic modulation scheme.