Iikhonsepthi ezimbini ezisisiseko zelaser, enye ivuselelwa ukuphuma, enye yiresonator. Kulo phepha, umgaqo osisiseko we-DBR (i-Distributed Bragg Reflector), eyi-resonator kwi-laser yohlobo lwe-VCSEL, yaziswa. Ulwazi olubini olusisiseko lwefiziksi: inguqu yesigaba sokubonisa kunye nokuphazamiseka kwefilimu encinci yaziswa ngokulandelelanayo.
Indawo ye-DBR kwi-laser ye-VCSEL iboniswe ngezantsi:
Inguqu yesigaba sokucinga
Xa ukukhanya kuhanjiswa ukusuka kwi-optically sparse medium n1 ukuya kwi-optically dense medium n2 (inkomba ye-refractive n2>n1), ukukhanya okubonakalisiweyo kuya kudlula kwi-180 degree phase transition kwi-interface. Nangona kunjalo, akukho nguqu yesigaba eyenzekayo xa i-photodense medium idluliselwa kwi-photophobic medium.
Ukusuka kumbono wobunjineli, ukukhanya kukwangumbane we-electromagnetic, kwaye ukubonakaliswa kokukhanya kunokufana nokubonakaliswa komqondiso wombane xa i-impedance itshintsha. Xa isignali yombane ingena kumgca wokuhanjiswa kwe-impedance ephantsi ukusuka kumgca wokuhanjiswa kwe-impedance ephezulu, ivelisa ukubonakaliswa kwesigaba esibi (isigaba sokutshintshwa kwee-degrees ze-180), kwaye xa singena kumgca wokuhanjiswa kwe-impedance ephezulu ukusuka kumgca we-impedance ophantsi. , ivelisa ukubonakaliswa kwesigaba esihle (akukho tshintsho lwesigaba). Isalathiso se-refractive ye-optical transmission medium ifana ne-impedance yokuhanjiswa kombane wombane.
Iingcaciso ezinzulu zingaphaya kwemida yeli nqaku.
Ukuphazamiseka kwefilimu encinci
Xa ukukhanya kudlula ifilimu encinci, kuya kubonakaliswa kabini kwiindawo eziphezulu kunye nezantsi, kwaye ubukhulu befilimu encinci buya kuchaphazela umehluko wendlela ye-optical of the reflections ezimbini. Ukuba ubukhulu befilimu ebhityileyo bulawulwa ukuba bube (1/4+N) amaxesha obude be-wavelength, umahluko wendlela ye-optical of the reflections ezimbini (1/2+2N), kwaye umahluko wendlela yokukhanya uhambelana ne-180-degree. inguqu yesigaba, kwaye enye yezibonakalisi iya kungena kwinguqu yesigaba se-180-degree. Emva koko ukukhanya okubonakalisiweyo kwamaxesha amabini ekugqibeleni kwisigaba, kwaye i-superposition iphuculwe, oko kukuthi, i-coefficient ye-reflection jikelele iyanda. Ngapha koko, i-DBR ngumaleko otshintshanayo wamajelo eendaba erefractive index. Xa ukukhanya kudlula kwi-DBR, umaleko ngamnye uya kwandisa inkqubo ethile yokubonakalisa, kwaye i-coefficient yokubonisa i-DBR inokufikelela kwinqanaba eliphezulu kakhulu.
Umzobo wendlela yokuphazamiseka kwefilimu:
Qaphela 1: Ukuze kuboniswe ngokucacileyo, imisebe yokukhanya emithathu izotywe ngokwahlukeneyo, kodwa eneneni ihlanganiswe kunye;
Umzobo 2: Umboniso wokuqala oluhlaza okwesibhakabhaka (i-180 degree degree transition) kunye nowesibini ubonakalisa ukukhanya okutyheli (umahluko wesigaba se-180 ngenxa yomehluko wendlela yokubona) ekugqibeleni ukwisigaba, kwaye i-superposition iphuculwe.
Ulwakhiwo lwe-DBR lunokwandisa umboniso ngokusebenzisa iileya ezininzi zokubonisa. Nangona kunjalo, i-DBR isebenza usebenzisa umgaqo wokuphazamiseka, ngoko ke i-DBR iya kuba nokukhanya okuphezulu kolunye uluhlu oluthile lwamaza okukhanya, kwaye inokufikelela kwilahleko ephantsi kakhulu, kunye nezinye iintlobo zezibonisi (ezinje ngemigangatho yentsimbi) zahlukile kwiimpawu zokubonisa.
Oku kungasentlaHDV Phoi-electron I-Technology Ltd. ukuzisa abathengi malunga nenqaku lentshayelelo "yeengqikelelo ezimbini ezisisiseko ze-laser", kwaye inkampani yethu yimveliso ekhethekileyo yabenzi benethiwekhi yamehlo, iimveliso ezibandakanyekayo zii-ONU series (OLT ONU/AC ONU/CATV ONU/GPON ONU/XPON I-ONU), uchungechunge lwemodyuli ye-Optical (imodyuli ye-fiber optical / i-Ethernet imodyuli ye-fiber optical / imodyuli ye-SFP optical), uchungechunge lwe-OLT (isixhobo se-OLT / i-OLT switch / ikati ye-optical OLT), njl., kukho iinkcukacha ezahlukeneyo zeemveliso zonxibelelwano kwiimfuno ezahlukeneyo iimeko zenkxaso yenethiwekhi, wamkelekile ukuba uthethe.