Optical modulator, inoshandiswa kudzora kusimba kwechiedza, kupatsanurwa kwe electro-optic, thermooptic, acoustooptic, all optical, basic theory of electro-optic effect.
Optical modulator ndeimwe yeakanyanya kukosha akabatanidzwa optical zvishandiso mune yakakwirira-kumhanya uye pfupi-renji kutaurirana kwemaziso.Chiedza modulator zvinoenderana neyayo modulation musimboti, inogona kupatsanurwa kuita electro-optic, thermooptic, acoustooptic, ese optical, nezvimwe, iwo akavakirwa pane yekutanga dzidziso dzakasiyana siyana dzakasiyana dze electro-optic maitiro, acoustooptic athari, magnetooptic athari. , Franz-Keldysh mhedzisiro, quantum zvakanaka Stark mhedzisiro, mutakuri wekuparadzira maitiro.
Theelectro-optical modulatormudziyo unodzora refractive index, absorptivity, amplitude kana chikamu chechiedza chinobuda kuburikidza nekuchinja kwevoltage kana munda wemagetsi.Iyo yepamusoro kune mamwe marudzi emodulator maererano nekurasikirwa, kushandiswa kwesimba, kumhanya uye kusanganisa, uye zvakare ndiyo inonyanya kushandiswa modulator parizvino.Mukuita kwekutapurirana kwemaziso, kutumira uye kugamuchira, iyo optical modulator inoshandiswa kudzora kusimba kwechiedza, uye basa rayo rinokosha zvikuru.
Chinangwa chekugadzirisa chiedza ndechekushandura chiratidzo chinodiwa kana ruzivo rwakatumirwa, kusanganisira "kubvisa chiratidzo chemashure, kubvisa ruzha, uye anti-kupindira", kuitira kuti zvive nyore kugadzirisa, kutumira uye kuona.
Mhando dzemodulation dzinogona kukamurwa kuita mapoka maviri akafara zvichienderana nekuti ruzivo rwakaiswa papi pamwenje wave:
Imwe isimba rekutyaira remwenje sosi yakagadziridzwa nechiratidzo chemagetsi;Imwe yacho ndeyekugadzirisa nhepfenyuro zvakananga.
Iyo yekutanga inonyanya kushandiswa pakukurukurirana kwemaziso, uye iyo yekupedzisira inonyanya kushandiswa kuona.For short: mukati modulation uye ekunze modulation.
Zvinoenderana neiyo modulation nzira, iyo modulation mhando ndeye:
2) Phase modulation;
3) Polarization modulation;
4) Frequency uye wavelength modulation.
1.1, kusimba modulation
Chiedza chesimba modulation ndiko kusimba kwechiedza sechinhu chemodulation, kushandiswa kwezvinhu zvekunze kuyera DC kana kunonoka kushanduka kwechiratidzo chechiedza kuita nekukurumidza frequency shanduko yechiratidzo chechiedza, kuitira kuti iyo AC frequency sarudzo amplifier inogona kushandiswa. wedzera, uyezve huwandu huchayerwa nguva nenguva.
1.2, chikamu modulation
Nheyo yekushandisa zvinhu zvekunze kushandura chikamu chemafungu echiedza uye kuyera huwandu hwemuviri nekuona shanduko yechikamu inonzi optical phase modulation.
Chikamu chechiedza chechiedza chinotarirwa nehurefu hwemuviri wekupararira kwechiedza, refractive index yepakati yekuparadzira uye kugovera kwayo, kureva, kuchinja kwechikamu chechiedza chechiedza chinogona kugadzirwa nekushandura maparameter ari pamusoro. kuwana phase modulation.
Nekuti iyo detector yemwenje kazhinji haigone kuona shanduko yechikamu chemwenje wave, isu tinofanirwa kushandisa tekinoroji yekupindira kwechiedza kushandura shanduko yechikamu kuita shanduko yekusimba kwechiedza, kuitira kuti tiwane kuwanikwa kwehuwandu hwekunze hwemuviri, saka. , iyo optical phase modulation inofanira kusanganisira zvikamu zviviri: imwe ndiyo nzira yemuviri yekugadzira kuchinja kwechikamu chechiedza chechiedza;Chechipiri ndiko kupindira kwechiedza.
1.3.Polarization modulation
Nzira iri nyore yekuwana mwenje modulation ndeye kutenderedza maviri polarizer ane hukama kune mumwe nemumwe.Zvinoenderana ne theorem yaMalus, iyo yekubuda kwemwenje kusimba ndeye I = I0cos2α
Ikoko: I0 inomiririra chiedza chechiedza chakapfuura nemapolarizers maviri apo ndege huru inopindirana;Alpha inomiririra Angle pakati pemapolarizers makuru ndege.
1.4 Frequency uye wavelength modulation
Nheyo yekushandisa zvinhu zvekunze kushandura frequency kana wavelength yechiedza uye kuyera ekunze huwandu hwemuviri nekuona shanduko muhuwandu kana wavelength yechiedza inonzi frequency uye wavelength modulation yechiedza.
Nguva yekutumira: Aug-01-2023