Kodi gawo modulator ndi chiyani?

Kodi ndi chiyanimodulator ya gawo

Phase modulator ndi optical modulator yomwe imatha kuwongolera gawo la kuwala kwa laser. Mitundu yodziwika bwino ya phase modulators ndi Pockels box-basedma modulators a electro-opticndi ma modulators amadzimadzi a kristalo, omwe angagwiritsenso ntchito kusintha kwa thermal fiber refractive index kapena kusintha kwa kutalika, kapena potambasula kuti asinthe kutalika. Ma modulators osiyanasiyana amagwiritsidwa ntchito m'munda wa ma optics ophatikizidwa, komwe kuwala kosinthidwa kumafalikira mu waveguide.

Makhalidwe ofunikira a ma modulators a gawo ndi awa: Kukula kwa modulation ya gawo (komwe kumatsimikiza index ya modulation ndi mphamvu yoyerekeza ya sideband) kumafuna bandwidth ya drive voltage modulation (modulation frequency range),modulator yamagetsi ndi kuwalaIli mu dongosolo la GHz, ndipo chipangizo chomwe chimagwiritsa ntchito mphamvu ya kutentha kapena zinthu zamadzimadzi za kristalo ndi chocheperako kuposa bandwidth yogwirira ntchito ya chotsegulira cha chipangizocho. Chimachepetsa kutalika kwa kuwala kwa kuwala kwa kuwala kosinthidwa Miyeso yakunja ya chipangizocho Makhalidwe awa amasiyana kwambiri pamitundu yosiyanasiyana ya ma modulators a gawo. Chifukwa chake, ma modulators osiyanasiyana a gawo ayenera kugwiritsidwa ntchito m'njira zosiyanasiyana.

Zitsanzo za ntchito za phase modulator ndi izi: Phase modulator mu laser resonator ya single-frequency laser ingagwiritsidwe ntchito pokonza wavelength, kapena active mode-locking (FM mode-locking) ya laser kuti ipange phase beam ngati ili ndi modulation intensity yocheperako, ingagwiritsidwe ntchito mu laser frequency stabilization mechanism, mwachitsanzo, Njira ya Pell-Drever-Hall imafuna phase modulators m'zida zambiri zoyezera ma interferometer spectral, nthawi zambiri pogwiritsa ntchito zizindikiro zoyendetsera nthawi ndi nthawi. Miyeso ina imafuna ma frequency combs, omwe amapezeka mwa kuyika single-frequency beam mu phase modulator. Pankhaniyi, phase modulation nthawi zambiri imafunika kukhala yolimba, kuti muthe kupeza ma side band ambiri. Mu data transmitter ya optical fiber communication system, phase modulator ingagwiritsidwe ntchito kutanthauzira chidziwitso chotumizidwa. Mwachitsanzo, njira ya phase-shift keying imagwiritsidwa ntchito.