Indlela yokulinganisa ububanzi bomugqa we-laser yemvamisa eyodwa

Indlela yokulinganisa ububanzi bomugqai-laser yemvamisa eyodwa
Izindlela eziningana zokulinganisa ububanzi bomugqa we-laser yemvamisa eyodwa kusukela kokukhulu kuya kokuncane, kanye nezimo zazo ezisebenzayo namaphuzu obuchwepheshe, zifingqiwe kanje:
1, Ukulinganisa okuqondile nge-spectrometer (ukulinganisa okulinganiselwe, ububanzi bomugqa ≥ izinga le-GHz)
Sebenzisa i-grating spectrometer noma i-optical spectrometer (OSA) ukuze unqume ukuthi ngabe iyimodi eyodwa ye-longitudinal, ulinganise isilinganiso sokucindezela imodi ye-edge kanye nobubanzi bemodi ye-longitudinal. Isixazululo se-optical spectrometer esivamile singaba ngu-0.1-0.01 nm (esihambisana no-0.1-10 GHz we-near-infrared), futhi ukusebenza okuphezulu kungafinyelela ku-1 ntambama, okulungele kuphela ukuhlolwa kokuqala kobubanzi be-linewidth.i-laser.
2, Ukuskena i-Fabry Perot (FP) etalon (ububanzi bomugqa obuphakathi obuncane)
Ifanele ama-laser anobubanzi bomugqa obuncane noma isikhala esincane semodi ye-longitudinal kunesisombululo se-optical spectrometer. Uma ulinganisa, kubalulekile ukwahlulela ngokusekelwe kusilinganiso sobubanzi bomugqa we-laser nobubanzi bemodi ye-FP cavity: lapho ububanzi bomugqa we-laser bukhulu kakhulu kunobubanzi bemodi ye-cavity, bungafundwa ngqo; Uma kufana, kudingeka i-deconvolution; Uma incane kakhulu kunesikhathi, kuyadingeka ukuyishintsha nge-FP enembile kakhulu noma usebenzise ubuchwepheshe bokumodela bomphetho ukuze kulinganiswe.
3, i-Heterodyne/Delay Self Heterodyne kanye ne-Self Homodyne (Ububanzi bomugqa obuncane, ububanzi be-kHz~MHz)
Uma i-laser ye-single frequency ehambisanayo ephezulu idlula isinqumo se-optical spectrometer, indlela ye-heterodyne (ene-laser yereferensi yomugqa omncane kakhulu) noma indlela ye-self heterodyne/self homodyne ebambezelekile (ngaphandle kwe-laser yereferensi) ivame ukusetshenziswa. Idivayisi iyi-fiber Mach Zehnder noma i-interferometer ye-Michelson, enokulibaziseka kwesikhathi okungu-τ d_d (okunqunywa umehluko wobude be-fiber) phakathi kwezingalo ezimbili;I-AOM Modulatorukushintsha kwemvamisa kuyinto ezenzekela ngokwayo, engaxhunywanga yi-self homodyne. I-AOM Modulator ingasusa imvamisa yokushaya kusuka ku-DC ukuze inciphise ukuphazamiseka kwemvamisa ephansi.
4, Izinyathelo Zokuqapha:
4.1 Imicu yokukhanya ende enwetshiwe ithintwa ukudlidliza/ukukhukhuleka kokushisa, futhi ukuzinza kwe-interferometer kudinga ukuthuthukiswa;
4.2 Iziteshi ezimbili zamandla zidinga ukulinganiswa, futhiI-EDFA Optical Amplifieri-interferometer ye-fiber ring noma i-multicycle cycle ingasetshenziswa;
4.3 Uma ububanzi bomugqa buncane kakhulu, bungafunda ububanzi bomugqa obungu-20 dB, bese buthola ububanzi bomugqa obungu-3 dB ngokusekelwe ekwakhekeni komugqa we-Lorentz;
4.4 Sebenzisa isilawuli se-polarization (PC) noma isibuko esijikelezayo se-Faraday (FRM) ukuvimbela ukufiphala kwe-polarization.