Imiqondo emibili eyisisekelo ye-laser, eyodwa ivuselela ukuphuma, enye iyi-resonator. Kuleli phepha, kwethulwa umgomo oyisisekelo we-DBR (Distributed Bragg Reflector), okuyi-resonator kumalaser ohlobo lwe-VCSEL. Ulwazi olubili oluyisisekelo lwe-physics: ukuguqulwa kwesigaba sokubonisa kanye nokuphazamiseka kwefilimu emincane kwethulwa ngokulandelana.
Isikhundla se-DBR ku-laser ye-VCSEL siboniswe ngezansi:
Inguquko yesigaba sokubonisa
Uma ukukhanya kudluliselwa kusuka ku-optically sparse medium kuya ku-optical dense medium n2 (inkomba ye-refractive n2>n1), ukukhanya okubonisiwe kuzongena kunguquko yesigaba esingu-180 degree kusixhumi esibonakalayo. Kodwa-ke, akukho ukuguqulwa kwesigaba okwenzeka lapho i-photodense medium idluliselwa ku-photophobic medium.
Ngokombono wobunjiniyela, ukukhanya kubuye kube yigagasi likagesi, futhi ukubonakaliswa kokukhanya kungafana nokubonakaliswa kwesignali kagesi lapho i-impedance ishintsha. Lapho isignali kagesi ingena emgqeni wokudlulisa we-impedance ophansi ovela emgqeni wokudlulisa we-impedance ophezulu, ukhiqiza ukubonakaliswa kwesigaba esibi (isigaba sokuguqulwa kwama-degrees angu-180), futhi lapho singena emgqeni wokudlulisa we-impedance ophezulu ovela emgqeni wokudlulisa we-impedance ophansi. , ikhiqiza ukubonakaliswa kwesigaba esihle (akukho ukuguqulwa kwesigaba). Inkomba ye-refractive ye-optical transmission medium ifana nokuvinjelwa kokudluliswa kwesignali kagesi.
Izincazelo ezijulile zingaphezu kobubanzi balesi sihloko.
Ukuphazamiseka kwefilimu encane
Uma ukukhanya kudlula ifilimu elincanyana, kuzobonakala kabili ezindaweni ezingaphezulu neziphansi, futhi ubukhulu befilimu encane buzothinta umehluko wendlela yokubona kokubonisa okubili. Uma ukushuba kwefilimu ezacile kulawulwa ukuthi kube (1/4+N) izikhathi zobude begagasi, umehluko wendlela yokubona yezibonisi ezimbili ngu-(1/2+2N), futhi umehluko wendlela yokubona uhambisana ne-180-degree. inguquko yesigaba, futhi okunye kokuboniswa kuzobhekana noshintsho lwesigaba esingu-180-degree. Khona-ke ukukhanya okubonisiwe kwezikhathi ezimbili ekugcineni kuba esigabeni, futhi i-superposition iyathuthukiswa, okungukuthi, i-coefficient yokubonisa iyonke iyakhuphuka. Eqinisweni, i-DBR iyisendlalelo esishintshayo semidiya emibili yenkomba ye-refractive. Uma ukukhanya kudlula ku-DBR, isendlalelo ngasinye sizokhulisa isistimu ethile yokubonisa, futhi i-reflection coefficient ye-DBR ingafinyelela izinga eliphezulu kakhulu.
Umdwebo wendlela yokuphazamiseka kwefilimu:
Qaphela 1: Ukuze ubonise ngokucacile, imishayo emithathu yokukhanya idwetshwa ngokwehlukana, kodwa empeleni ihlanganiswe ndawonye;
Umfanekiso 2: Ukuboniswa kokuqala kokuluhlaza okwesibhakabhaka (inguquko yesigaba esingu-180 degree) kanye nokukhanya kwesibili okukhanyayo okuphuzi (umehluko wesigaba esingu-180 degree ngenxa yokuhluka kwendlela yokubona) ekugcineni kusesigabeni, futhi indawo ephezulu iyathuthukiswa.
Isakhiwo se-DBR singakhulisa ukubonakaliswa ngokusebenzisa izendlalelo eziningi zokubonisa. Kodwa-ke, i-DBR isebenza kusetshenziswa umgomo wokuphazamiseka, ngakho i-DBR izoba nokubonakala okuphezulu kwezinye izigaba ezithile ze-wavelength zokukhanya, futhi ingafinyelela ukulahlekelwa okuphansi kakhulu, nezinye izinhlobo zezibonisi (ezifana nezindawo zensimbi) zihlukile kuzici zokubonisa.
Okungenhla kunjaloI-HDV Phoi-electron I-Technology Ltd. ukuletha amakhasimende mayelana "nemiqondo emibili eyisisekelo yelaser", futhi inkampani yethu iwumkhiqizo okhethekile wabakhiqizi benethiwekhi yamehlo, imikhiqizo ehilelekile uchungechunge lwe-ONU (OLT ONU/AC ONU/CATV ONU/GPON ONU/XPON I-ONU), uchungechunge lwemojula ye-Optical (i-fiber optical module/Ethernet optical fibre module /SFP optical module), uchungechunge lwe-OLT (imishini ye-OLT / inkinobho ye-OLT / ikati lokubuka i-OLT), njll., kunezincazelo ezihlukahlukene zemikhiqizo yokuxhumana yezidingo ezahlukene izimo zokusekelwa kwenethiwekhi, wamukelekile ukubonisana.