Ob lub ntsiab lus tseem ceeb ntawm laser, ib qho yog stimulated emission, lwm yam yog lub resonator. Nyob rau hauv daim ntawv no, lub hauv paus ntsiab lus ntawm DBR (Distributed Bragg Reflector), uas yog ib tug resonator nyob rau hauv VCSEL hom lasers, yog qhia. Ob qhov kev paub txog physics yooj yim: kev hloov pauv hloov pauv thiab kev cuam tshuam ntawm zaj duab xis nyias yog qhia raws li.
Txoj hauj lwm ntawm DBR hauv VCSEL laser yog qhia hauv qab no:
Reflection theem hloov
Thaum lub teeb kis tau los ntawm optically sparse nruab nrab n1 mus rau optically ntom nruab nrab n2 (refractive index n2>n1), lub teeb reflected yuav undergo ib 180 degree theem hloov ntawm lub interface. Txawm li cas los xij, tsis muaj theem hloov pauv tshwm sim thaum lub nruab nrab photodense kis mus rau qhov nruab nrab photophobic.
Los ntawm qhov kev xav ntawm engineering, lub teeb kuj yog hluav taws xob nthwv dej, thiab qhov kev xav ntawm lub teeb tuaj yeem ua piv rau qhov kev xav ntawm lub teeb liab hluav taws xob thaum lub impedance hloov. Thaum lub teeb liab hluav taws xob nkag mus rau cov kab hluav taws xob uas tsis tshua muaj hluav taws xob los ntawm cov kab hluav taws xob siab impedance, nws ua rau lub teeb pom kev tsis zoo (theem hloov ntawm 180 degrees), thiab thaum nws nkag mus rau high-impedance kis kab los ntawm cov kab hluav taws xob qis impedance. , nws tsim ib theem zoo xav txog (tsis muaj theem hloov). Lub refractive index ntawm qhov nruab nrab kis tau tus mob yog zoo ib yam rau lub impedance ntawm ib tug hluav taws xob teeb liab kis tau tus mob.
Cov lus piav qhia tob dua yog dhau ntawm cov kab lus no.
Nyias zaj duab xis cuam tshuam
Thaum lub teeb dhau los ntawm cov yeeb yaj kiab nyias, nws yuav raug cuam tshuam ob zaug ntawm qhov chaw sab sauv thiab sab qis, thiab cov tuab ntawm cov yeeb yaj kiab nyias yuav cuam tshuam rau qhov sib txawv ntawm qhov sib txawv ntawm ob qhov kev xav. Yog hais tias lub thickness ntawm cov zaj duab xis nyias yog tswj los ua (1/4 + N) lub sij hawm lub wavelength, lub optical txoj kev sib txawv ntawm ob lub reflections yog (1/2 + 2N), thiab optical txoj kev sib txawv mus rau 180-degree. theem kev hloov pauv, thiab ib qho ntawm qhov kev xav yuav dhau mus rau 180-degree theem hloov pauv. Tom qab ntawd lub teeb pom kev ntawm ob lub sij hawm nws thiaj li nyob rau hauv theem, thiab lub superposition yog kho kom zoo, uas yog, tag nrho cov reflection coefficient yog nce. Qhov tseeb, DBR yog ib txheej txheej ntawm ob lub refractive index media. Thaum lub teeb dhau los ntawm DBR, txhua txheej yuav ua rau muaj kev cuam tshuam qhov kev xav, thiab qhov kev cuam tshuam ntawm DBR tuaj yeem ncav cuag qhov siab heev.
Zaj duab xis cuam tshuam mechanism daim duab:
Lus Cim 1: Txhawm rau kom pom tseeb, peb lub teeb ntawm lub teeb yog kos nyias, tab sis lawv tau muab tso ua ke;
Daim duab 2: Thawj qhov kev xav ntawm xiav (180 degree kev hloov pauv) thiab qhov thib ob pom lub teeb daj (180 degree theem sib txawv vim qhov sib txawv ntawm qhov pom qhov txawv) yog thaum kawg nyob rau theem, thiab lub superposition yog txhim kho.
Tus qauv DBR tuaj yeem ua kom muaj qhov cuam tshuam los ntawm ntau txheej ntawm kev xav. Txawm li cas los xij, DBR ua haujlwm siv lub hauv paus ntsiab lus cuam tshuam, yog li DBR yuav muaj kev cuam tshuam siab rau qee qhov tshwj xeeb wavelength ranges ntawm lub teeb, thiab tuaj yeem ua tiav qhov poob qis, thiab lwm hom kev cuam tshuam (xws li cov hlau nto) txawv ntawm cov yam ntxwv ntawm kev xav.
Cov saum toj no yogHDV Phohluav taws xob Technology Ltd. coj cov neeg siv khoom txog "ob lub ntsiab lus ntawm laser" cov lus qhia, thiab peb lub tuam txhab yog cov chaw tsim khoom tshwj xeeb ntawm optical network manufacturers, cov khoom lag luam koom nrog ONU series (OLT ONU / AC ONU / CATV ONU / GPON ONU / XPON ONU), Optical module series (optical fiber module / Ethernet optical fiber module / SFP optical module), OLT series (OLT khoom / OLT hloov / optical cat OLT), thiab lwm yam., muaj ntau yam specifications ntawm kev sib txuas lus khoom rau cov kev xav tau sib txawv scenarios rau kev txhawb nqa network, txais tos sab laj.