Hanyar aunawa don faɗin layi na laser mai mita ɗaya

Hanyar aunawa don faɗin layi naLaser mita ɗaya
An taƙaita hanyoyi da dama na aunawa don layin laser mai mita ɗaya daga mai kauri zuwa mara kyau, da kuma yanayin da suka dace da kuma ma'aunin fasaha, kamar haka:
1, aunawa kai tsaye ta hanyar spectrometer (ma'aunin kauri, girman layi ≥ GHz matakin)
Yi amfani da na'urar auna haske ko na'urar auna haske (OSA) don tantance ko yanayi ne na tsayi guda ɗaya, auna rabon danne yanayin gefen da faɗin layin layin tsayi. Ƙudurin na'urar auna haske ta gani ta al'ada shine kusan 0.1-0.01 nm (daidai da 0.1-10 GHz ga kusan infrared), kuma babban aikin zai iya kaiwa 1 na rana, wanda ya dace kawai don tantancewa na farko na faɗin layin fadi.laser.
2, Scanning Fabry Perot (FP) etalon (matsakaicin kunkuntar layi)
Ya dace da na'urorin laser masu ƙanƙantar faɗi ko kuma ƙaramin tazara a yanayin tsayi fiye da ƙudurin na'urar hangen nesa ta gani. Lokacin aunawa, ya zama dole a yi hukunci bisa ga rabon faɗin layin laser zuwa faɗin yanayin ramin FP: lokacin da faɗin layin laser ya fi girma fiye da faɗin yanayin rami, ana iya karanta shi kai tsaye; Idan makamancin haka, ana buƙatar rabuwa; Idan ya fi ƙanƙanta fiye da lokacin, ya zama dole a maye gurbinsa da FP mafi daidaito ko amfani da fasahar ƙirar gefen don kimantawa.
3、 Heterodyne/Delay Self Heterodyne da Self Homodyne (Ƙaramin layi, kewayon kHz ~ MHz)
Idan laser mai yawan haɗuwa ya wuce ƙudurin na'urar hangen nesa ta gani, ana amfani da hanyar heterodyne (tare da laser mai faɗi mai faɗi da aka sani) ko hanyar heterodyne/homodyne kai da aka jinkirta lokaci (ba tare da laser mai nuni ba) akai-akai. Na'urar tana amfani da fiber Mach Zehnder ko Michelson interferometer, tare da jinkirin lokaci na τ d_d (wanda aka ƙaddara ta hanyar bambancin tsawon zare) tsakanin hannaye biyu;Mai daidaita AOMCanjin mitar yana da alaƙa da kai, ba a haɗa shi da kai ba. AOM Modulator na iya canza mitar bugun daga DC don rage tsangwama mai ƙarancin mita.
4, Gargaɗi:
4.1 Zaren gani mai tsawo yana shafar girgiza/zafin jiki, kuma yana buƙatar inganta daidaiton na'urar auna zafin jiki;
4.2 Dole ne a daidaita hanyoyin wutar lantarki guda biyu, kumaNa'urar ƙara haske ta EDFAAna iya amfani da diyya ko zare mai zagaye mai yawa;
4.3 Lokacin da faɗin layin ya yi ƙanƙanta sosai, zai iya karanta faɗin layi na 20 dB, sannan ya cire faɗin layi na 3 dB bisa ga siffar layin Lorentz;
4.4 Yi amfani da na'urar sarrafa polarization (PC) ko madubin Faraday mai juyawa (FRM) don rage disashewar polarization.