I-42.7 Gbit/S Electro-Optic Modulator kubuchwepheshe be-Silicon

Esinye sezimpawu ezibaluleke kakhulu ze-optical modulator yijubane layo lokuguquguquka noma i-bandwidth, okufanele okungenani ibe ngokushesha njenge-elekthronikhi etholakalayo. Ama-transistors anemvamisa yokudlulisa ngaphezu kwe-100 GHz asevele ebonisiwe kubuchwepheshe be-silicon obungu-90 nm, futhi ijubane lizokhula njengoba usayizi wesici esincane uncishiswa [1]. Kodwa-ke, i-bandwidth yama-modulators asekelwe ku-silicon anamuhla inqunyelwe. I-Silicon ayinayo i-χ(2)-nonlinearity ngenxa yesakhiwo sayo sekristalu esiphakathi nendawo. Ukusetshenziswa kwe-silicon ecindezelwe sekuholele emiphumeleni ethokozisayo kakade [2], kodwa ama-nonlinearities awavumeli amadivayisi asebenzayo. Ngakho-ke ama-modulators e-silicon photonic asezingeni eliphezulu asathembele ekusabalaleni kwe-free-carrier kuma-pn noma kuma-pin junctions [3-5]. Ama-forward biased junctions aboniswe ukuthi abonisa umkhiqizo we-voltage-length ophansi njenge-VπL = 0.36 V mm, kodwa ijubane lokuguquguquka linqunyelwe yi-dynamics yabathwali abancane. Noma kunjalo, amazinga edatha angu-10 Gbit/s akhiqizwe ngosizo lokugcizelela kwangaphambilini kwesignali kagesi [4]. Kusetshenziswa ama-junctions aphambene esikhundleni salokho, i-bandwidth inyuswe yaba cishe yi-30 GHz [5,6], kodwa umkhiqizo we-voltage length ukhuphukele ku-VπL = 40 V mm. Ngeshwa, ama-modulator e-plasma effect phase modulators anjalo akhiqiza ukuguqulwa kwamandla okungafunwa [7], futhi asabela ngokungaqondile ku-voltage esetshenzisiwe. Amafomethi okuguquguquka athuthukisiwe njenge-QAM adinga, nokho, impendulo eqondile kanye nokuguqulwa kwesigaba esimsulwa, okwenza ukusetshenziswa komphumela we-electro-optic (umphumela we-Pockels [8]) kube yinto efiselekayo kakhulu.

2. Indlela ye-SOH
Muva nje, indlela ye-silicon-organic hybrid (SOH) iphakanyisiwe [9–12]. Isibonelo se-modulator ye-SOH siboniswe ku-Fig. 1(a). Yakhiwe yi-slot waveguide eqondisa insimu ye-optical, kanye nemichilo emibili ye-silicon exhuma ngogesi i-optical waveguide kuma-electrode ensimbi. Ama-electrode atholakala ngaphandle kwensimu ye-optical modal ukugwema ukulahlekelwa yi-optical [13], Fig. 1(b). Idivayisi imbozwe ngezinto eziphilayo ze-electro-optic ezigcwalisa ngokulinganayo i-slot. I-voltage yokuguqula ithwalwa yi-metallic electrical waveguide bese iwela ngaphesheya kwe-slot ngenxa yemichilo ye-silicon eqhubayo. Insimu kagesi ephumayo bese ishintsha inkomba yokukhanya ku-slot ngomphumela we-electro-optic osheshayo kakhulu. Njengoba i-slot inobubanzi obungu-100 nm, ama-volt ambalwa anele ukukhiqiza amasimu okuguqula aqinile kakhulu alandelana ngobukhulu bamandla e-dielectric wezinto eziningi. Isakhiwo sinokusebenza kahle kokuguquguquka okuphezulu njengoba kokubili amasimu okuguqula kanye nama-optical agxile ngaphakathi kwe-slot, Fig. 1(b) [14]. Ngempela, ukusetshenziswa kokuqala kwama-modulators e-SOH anokusebenza kwe-sub-volt [11] sekuvele kubonisiwe, futhi ukuguquguquka kwe-sinusoidal kufikela ku-40 GHz kwaboniswa [15,16]. Kodwa-ke, inselele ekwakheni ama-modulators e-SOH asheshayo ane-voltage ephansi ukudala umucu wokuxhuma oqhuba kakhulu. Ku-circuit efanayo, i-slot ingamelwa yi-capacitor C kanye nama-conductive strips ngama-resistors R, Umfanekiso 1(b). Isikhathi se-RC esihambisanayo sinquma i-bandwidth yedivayisi [10,14,17,18]. Ukuze kuncishiswe ukumelana ne-R, kuphakanyiswe ukuthi kusetshenziswe ama-silicon strips [10,14]. Ngenkathi i-doping ikhulisa ukuhanjiswa kwe-silicon strips (futhi ngaleyo ndlela ikhulisa ukulahlekelwa kwe-optical), umuntu ukhokha inhlawulo yokulahlekelwa eyengeziwe ngoba ukuhamba kwe-electron kuphazanyiswa ukuhlakazeka kokungcola [10,14,19]. Ngaphezu kwalokho, imizamo yakamuva yokukhiqiza ibonise ukuhanjiswa okuphansi ngokungalindelekile.

I-Beijing Rofea Optoelectronics Co., Ltd. etholakala “eSigodini saseSilicon” saseShayina – i-Beijing Zhongguancun, iyibhizinisi lobuchwepheshe obuphezulu elizinikele ekukhonzeni izikhungo zocwaningo zasekhaya nezangaphandle, izikhungo zocwaningo, amanyuvesi kanye nabasebenzi bocwaningo lwesayensi yebhizinisi. Inkampani yethu ihileleke kakhulu ocwaningweni oluzimele kanye nentuthuko, ukuklama, ukukhiqiza, ukuthengisa imikhiqizo ye-optoelectronic, futhi inikeza izixazululo ezintsha kanye nezinsizakalo zobungcweti, ezenzelwe wena kubacwaningi besayensi kanye nonjiniyela bezimboni. Ngemva kweminyaka eminingi yokusungula izinto ezintsha, yakhe uchungechunge olucebile noluphelele lwemikhiqizo ye-photoelectric, esetshenziswa kabanzi embonini kamasipala, yezempi, yezokuthutha, yamandla kagesi, yezezimali, yezemfundo, yezokwelapha kanye neminye imboni.

Silangazelela ukubambisana nawe!