Kuti vanhu vasangane nekuwedzera kwekuda ruzivo, huwandu hwekutumira kwe optical fiber communication systems huri kuwedzera zuva nezuva. Network yekutaurirana ye optical yeramangwana ichakura ikava network yekutaurirana ye optical fiber ine kumhanya kwakanyanya, kugona kukuru, kureba kukuru, uye kushanda zvakanaka kwe spectrum. Transmitter yakakosha. Transmitter ye optical signal inogadzirwa zvakanyanya ne laser inogadzira optical carrier, mudziyo we modulating electrical signal generating, uye high-speed electro-optical modulator inodzora optical carrier. Zvichienzaniswa nedzimwe mhando dze external modulators, lithium niobate electro-optical modulators dzine zvakanakira zve wide operating frequency, good stability, high disappearance ratio, stable working performance, high modulation rate, small chirp, easy coupling, mature production technology, nezvimwewo. Inoshandiswa zvakanyanya muma optical transmission systems ane kumhanya kukuru, kugona kukuru, uye kure kure.
Voltage yehafu-wave chinhu chakakosha zvikuru pa electro-optic modulator. Inomiririra shanduko mu bias voltage inoenderana ne output light intensity ye electro-optic modulator kubva pa minimum kusvika pa maximum. Inosarudza electro-optic modulator zvakanyanya. Maitiro ekuyera nekuchenjera uye nekukurumidza voltage yehafu-wave ye electro-optic modulator akakosha pakugadzirisa mashandiro emuchina uye kuvandudza kushanda kwemuchina. Voltage yehafu-wave ye electro-optic modulator inosanganisira DC (half-wave).
voltage ne radiofrequency) voltage yehafu-wave. Basa rekufambisa re electro-optic modulator nderinotevera:
Pakati pazvo pane simba remagetsi rinobuda re electro-optic modulator;
Ndiyo simba remagetsi rinopinda remodulator;
Kurasikirwa kwe electro-optic modulator pakupinza ndiko here?
Nzira dziripo dzekuyera voltage yehafu-wave dzinosanganisira nzira dzekugadzira kukosha kwakanyanya uye nzira dzekupeta kaviri frequency, idzo dzinogona kuyera voltage yemagetsi yakananga (DC) hafu-wave uye voltage yeredhiyo (RF) hafu-wave yemodulator, zvichiteerana.
Tafura 1 Kuenzanisa nzira mbiri dzekuedza voltage yehafu-wave
| Nzira yekukosha zvakanyanya | Nzira yekupetwa kaviri kakawanda | |
| Midziyo yerabhoritari | Simba reLaser Modulator yeIntensity iri kuyedzwa Magetsi eDC anogadziriswa ±15V Mita yemagetsi yeOptical | Chiedza cheLaser chinobva Modulator yeIntensity iri kuyedzwa Magetsi eDC anogadziriswa Oscilloscope kwakabva chiratidzo (DC Rusaruro) |
| nguva yekuedza | Maminetsi makumi maviri () | maminetsi mashanu |
| Zvakanakira zvekuedza | zviri nyore kuita | Bvunzo rakarurama Inogona kuwana DC hafu-wave voltage uye RF hafu-wave voltage panguva imwe chete |
| Zvakaipa zvekuedza | Nguva yakareba nezvimwe zvinhu, bvunzo haina kururama Muedzo wevafambi wakananga DC hafu-wave voltage | Nguva yakareba zvishoma Zvinhu zvakaita sekukanganisa kukuru kwekutonga kwewaveform distortion, nezvimwewo, bvunzo haisi yechokwadi |
Inoshanda seinotevera:
(1) Nzira yekukosha zvakanyanya
Nzira yekukosha kwakanyanya inoshandiswa kuyera voltage yeDC hafu-wave ye electro-optic modulator. Chekutanga, pasina chiratidzo chemodulation, curve yebasa rekufambisa ye electro-optic modulator inowanikwa nekuyera voltage yeDC bias uye shanduko yesimba rechiedza chinobuda, uye kubva ku curve yebasa rekufambisa Sarudza poindi yepamusoro uye poindi shoma yemutengo, uye uwane ma DC voltage anoenderana Vmax neVmin zvakateerana. Chekupedzisira, musiyano uripo pakati pema voltage maviri aya i voltage yehafu-wave Vπ=Vmax-Vmin ye electro-optic modulator.
(2) Nzira yekupetwa kaviri kakawanda
Yaishandisa nzira yekuwedzera frequency kuyera RF half-wave voltage ye electro-optic modulator. Wedzera DC bias computer uye AC modulation signal kune electro-optic modulator panguva imwe chete kuti ugadzirise DC voltage kana simba re output light rachinjwa kuita maximum kana minimum value. Panguva imwe chete, uye zvinogona kuonekwa pa dual-trace oscilloscope kuti output modulated signal ichaonekwa frequency double distortion. Musiyano chete weDC voltage inoenderana ne adherence frequency double distortions mbiri iRF half-wave voltage ye electro-optic modulator.
Pfupiso: Nzira yekukosha zvakanyanya uye nzira yekudzokorodza frequency zvinogona kuyera voltage yehafu-wave ye electro-optic modulator, asi kana tichienzanisa, nzira yekukosha ine simba inoda nguva yakareba yekuyera, uye nguva yakareba yekuyera ichave nekuda kwesimba remagetsi rinobuda re laser rinochinja-chinja uye rinokonzera zvikanganiso zvekuyera. Nzira yekukosha zvakanyanya inofanirwa kuskena DC bias nedanho diki uye kunyora simba remagetsi rinobuda re modulator panguva imwe chete kuti iwane voltage yehafu-wave yeDC yakarurama.
Nzira yekuwedzera frequency inzira yekuona voltage yehafu-wave nekutarisa frequency doubling waveform. Kana voltage inoshandiswa yebias yasvika pamutengo chaiwo, frequency multiplication inoitika, uye waveform distortion hainyanyi kuonekwa. Hazvisi nyore kuona nemaziso ega. Nenzira iyi, ichaita zvikanganiso zvakakura, uye chainoyera iRF half-wave voltage ye electro-optic modulator.